Ayad M. Takhakh

@nahrainuniv.edu.iq

Mechanical Engineering Department
Al - Nahrain University



                 

https://researchid.co/ayad

RESEARCH INTERESTS

Manufacturing Prov=cesses
Prosthetic & Orthotics Design and Materials Development
Friction Stir Welding

34

Scopus Publications

Scopus Publications

  • Study and Analysis of Below Knee Osseointegration Prosthesis
    Saif M. Abbas, Jumaa S. Chiad, and Ayad M. Takhakh Takhakh
    Mustansiriyah University College of Engineering
    Osseointegration is a medical metal implant into the residual bone of an amputated limb. The prosthesis can be connected to this implant. Different prosthetic components were thoroughly assessed using a mix of experimental testing and simulation results. The prosthetic foot's outstanding mechanical qualities were revealed during tensile testing on composite materials made of carbon and glass fibers. The mechanical properties of these materials yield stress Ϭy =70MPa, ultimate tensile strength Ϭult =162 MPa, and Young's modulus =2 GPa. For osseointegrated prosthetic components, the implant material yield stress Ϭy =470MPa, ultimate tensile strength Ϭult =558 MPa, and Young's modulus =2.7 GPa, Ti-13Nb-13Zr alloy, demonstrated excellent tensile and compression capabilities. Important information on both metallic and composite materials' durability under cyclic loads was obtained via fatigue testing.  The numerical simulations were carried out utilizing the ANSYS 17.2 program. The analysis shows the safety factor for a prosthetic model with below knee osseointegration is 1.563. So that the Von-Mises stress and total deformation were acceptable. The integration of actual data, such as the results of tensile, compression, and fatigue tests, with numerical simulations, highlights the significance of materials and mechanical analysis in developing prosthetic technology, promising improved mobility and quality of life for amputees.

  • Mechanical Properties and Numerical Modelling for Prosthetic Foot
    Saif M. Abbas, Jumaa S. Chiad, and Ayad M. Takhakh
    Mustansiriyah University College of Engineering
    This study uses laminated composite materials made of hybrid glass and carbon fibers to determine the mechanical characteristics of the foot. Tensile, bending, and fatigue of composite material were evaluated and applied to the ANSYS model. The volume fraction for carbon and glass fibers was 22.5% and 10.04%, respectively. The mechanical property results: σy = 40 MPa, σult = 150 MPa, and E = 1.2 GPa. The patient is a 30-year-old male with a left amputation side, 1.60 meters tall, and weighs 74 kg. The analysis was carried out for the two scenarios (toe-off and heel contact) as boundary conditions. The overall deformation, equivalent stresses, and foot safety factor have been calculated using ANSYS17.2 software. In the end, it appears that the foot is secure based on equivalent stress calculations and the Von-Mises hypothesis. The computed safety factor for the foot is constructed of a chosen composite material with the subsequent layers. When the heel (stance phase) is fixed at 1.3449, and the metatarsal (toe off) is fixed at 1.259, the safety factor for a force of 860 N is reached. The foot is secure, according to the Von-Mises hypothesis. 

  • DEAR-Taguchi analysis of buckling load and shear force in AA6061-T6 friction stir spot welds
    Rasha Mohammed Hussein, Bassam Ali Ahmed, Ali Hussein Alwan, Sameh Fareed Hasan, Alaa Abdulhady Jaber, Ayad M. Takhakh, and Saja Mohammed Jawad Theiban
    Springer Science and Business Media LLC

  • Mechanical compressive properties of TPU 3D printed with various parameters
    , Ahmed A. Ameen, Ayad M. Takhakh, , Abdalla Abdal-hay, , , and
    Al-Qadisiyah Journal for Engineering Sciences (QJES)
    Shape memory polymer (SMP) is a material that has the ability to recover its original shape from a temporary (deformed) shape by applying external stimuli. The smart scaffold based on SMP is used to enhance delivery, load bearing, and tissue defect filling. Therefore, specimens with the structure of the face-centered cubic were produced under various printing conditions to characterize their effects on the mechanical properties. Fused deposition modeling is utilized to construct the specimens of shape memory thermoplastic polyurethane (MM-3520). Printing parameters with different levels were used in specimen fabrication, including layer thicknesses of 0.1, 0.2, and 0.3 mm, printing temperatures of 210, 220, and 230 ° C, and printing speeds of 20, 30, and 40 mm/sec. We performed the microstructural analysis under a microscope to examine the impact of printing factors on lattice structures. Then there is the compression test, which evaluates mechanical properties such as linear elastic stiffness, collapse stress, plateau stiffness, and densification stress. Analyzing the microstructure of the printed specimens exhibits that the specimens with the highest printing temperature, the lowest printing speed, and a thinner printing layer have better layer adhesion and lower porosities. As well, figures and main effect plots revealed that the specimens printed with a layer height of 0.1mm, a printing temperature of 230 ° C, and a printing speed of 20 mm/s had compressive strengths of 0.6129±0.062, 0.6018±0.106, and 0.6082±0.078 MPa, respectively. These are the highest results in terms of strength compared to other levels of parameters.

  • Study and analysis of Ti13Nb13Zr implants in the above knee osseointegration prosthesis
    , Saif Abbas, Ayad Takhakh, , Jumaa Chiad, , Borhen Louhichi, and
    Al-Qadisiyah Journal for Engineering Sciences (QJES)
    Introduction: Osseointegration is a particular kind of prosthesis that is inserted a short titanium rod or screw into the bone surgically and joined to the prosthetic limb. Experimental part: This study looked at a patient's gait analysis with above-knee amputation wearing an osseointegration prosthesis implant when walking above a force plate. Evaluated the mechanical and fatigue properties of a Ti13Nb13Zr alloy implant. Theoretical part: Drawing and analysis of a femoral bone model with an osseointegration implant using Ansys Workbench 17.2. Results and discussion: The results of the tensile testing showed an ultimate tensile strength of 553 MPa, an average yield strength of 480 MPa, an elongation of 19.66%, and a Young's modulus of 2.73 GPa. Furthermore, a compressive strength of 1010 MPa and a compression yield strength of 700 MPa were found by compression testing. The results of fatigue testing, which were displayed as S-N curves, highlighted the alloy's time-dependent fatigue behavior by showing decreasing fatigue strength with an increase in cycles. The force plate showed a maximum force of 600 N was reported. A strong safety margin was shown by Finite Element Analysis in the bone containing the implant, with safety factors often more than 5 and low deformation (2.4 mm) appropriate for prosthetic uses. A good static design was confirmed by the Von-Mises stress distribution, which was primarily below 46 MPa. Conclusion: Comprehensive results confirm the mechanical feasibility of the Ti13Nb13Zr alloy for prosthetic applications and offer important new information for improving prosthetic design, guaranteeing durability, and improving safety in practical applications.

  • EEG-Based Control of a 3D-Printed Upper Limb Exoskeleton for Stroke Rehabilitation
    ‪Saad M. Sarhan‬‏, Mohammed Z. Al-Faiz, and Ayad Takhakh
    International Association of Online Engineering (IAOE)
    Brain-computer interfaces (BCIs) have emerged as transformative tools for translating users’ neural signals into commands for external devices. The urgent need for innovative treatments to enhance upper limb motor function in stroke survivors is underscored by the limitations of traditional rehabilitation methods. The development of communication and control technology for individuals with severe neuromuscular diseases, particularly stroke patients, is centered on utilizing electroencephalographic (EEG) signals to accurately decode users’ intentions and operate external devices. Two healthy subjects and a stroke patient were enrolled to acquire EEG signals using the EMOTIV EPOC+ sensor. The experimental procedure involved recording five actions for both motor imagery and facial expression signals to control the 3D-printed upper limb exoskeleton. EEGLAB and BCILAB software were used for preprocessing and classification. The results showed successful EEG-based control of the exoskeleton, representing a significant advancement in assistive technology for individuals with motor impairments. The support vector machine (SVM) classifier achieved higher accuracy in both offline and online modes for both motor imaginary and facial expression tasks. The conclusion highlights the appropriateness of using EEGLAB for offline EEG data analysis and BCILAB for both offline and online analysis and classification. The integration of servo motors in the exoskeleton, allowing movements in five Degrees of Freedom (DOF), positions it as an effective rehabilitation solution for individuals with upper limb impairments.

  • Free vibration analysis for polyester/graphene nanocomposites multilayer functionally graded plates
    Shahad Qusi Abd Alqader, Bashar Owaid Bedaiwi, Emad Kadum Njim, Ayad M. Takhakh, and Lazreg Hadji
    Vasyl Stefanyk Precarpathian National University
    In the current work, an FGM nanocomposite made of multi-layers of graphene nanoparticles and a polyester-based matrix was constructed using the molds with a hand lay-up technique to attain an accurate shape and reduce defects in the final product. The desired models have four, six, and 11 layers and different volume fractions of nanoparticles (0.5, 1, 2, 3, 4, and 5%). This study conducted various experimental tests to analyze the free vibration characteristics of functionally graded composite sandwich rectangular structures with simply supported boundary conditions to evaluate the significance of hole number and cutout location in fundamental frequencies. For holes, three types are used (2, 4, and 6) holes with a 10 mm diameter, while for cutouts, three geometrical designs are used (circular, rectangular, and triangular) with various aspect ratios (r = 1, 1.5, 2, and 2.5). A numerical study was carried out to validate the experimental solution, employing modal analysis and finite element analysis (FEA) using ABAQUS software tools. From the findings, the experimental findings and numerical calculations exhibit a satisfactory level of concurrence, displaying a maximum discrepancy of 9.5%. The results show that the fundamental frequency decreases by increasing the cutouts' aspect ratio (r=a/b). There is minimal variation between r =1 and r=  1.5, but a noticeable decrease is observed at an aspect ratio of r= 2.5. This difference is primarily influenced by the type of material gradient and the number of holes, specifically for a given thickness of the functionally graded (FG) plates.

  • ANALYSIS OF THE TRANSTIBIAL OSSEOINTEGRATION PROSTHESIS


  • A review on EMG/EEG based control scheme of upper limb rehabilitation robots for stroke patients
    Saad M. Sarhan, Mohammed Z. Al-Faiz, and Ayad M. Takhakh
    Elsevier BV

  • An overview of the latest research on the impact of 3D printing parameters on shape memory polymers
    Ahmed A. Ameen, Ayad M. Takhakh, and Abdalla Abdal-hay
    Elsevier BV


  • Simulation of gait cycle in sagittal plane for above-knee prosthesis
    Saif M. J. Haider, Ayad M. Takhakh, Muhannad Al-Waily, and Yasir Saadi
    AIP Publishing

  • Designing a 3D virtual test platform for evaluating prosthetic knee joint performance during the walking cycle
    Saif M. J. Haider, Ayad M. Takhakh, and Muhannad Al-Waily
    Walter de Gruyter GmbH
    Abstract This article introduced a three-dimension CAD model of a prosthesis testing platform using SolidWorks software to conduct a kinematic and dynamic analysis of the transfemoral prosthesis of the virtual model. Concurrently, the event-based motion simulation (EBMS) procedure was carried out on the CAD model. The concept of the operational strategy of the test platform was clarified through the machine’s real-life experience before being constructed in vitro. The platform model is capable of reproducing two active movements to simulate the locomotion of the thigh angle and hip vertical displacement for assessing the artificial knee angle motion during the gait cycle. These motions were controlled by two rotary forces (motors) that are utilized to implement control actions in EBMS. The prosthetic knee joint was built with a single axis that performs flexion and extension via the axial force of the spring. The simulation results of the thigh angle motion ranged from 2 0 ° 2{0}^{^\\circ } to − 1 5 ° -1{5}^{^\\circ } , while the maximum flexion of the prosthetic knee joint was ( 4 6 ° 4{6}^{^\\circ } ). The mean absolute error was ( 2.72 7 ° 2.72{7}^{^\\circ } ) and ( 8.33 8 ° 8.33{8}^{^\\circ } ) for the thigh and knee joints, respectively. In conclusion, the findings can be utilized to facilitate the design and development of prostheses.

  • A review of use of nanoparticle additives in lubricants to improve its tribological properties
    Zaman Abud Almalik Abud Ali, Ayad M. Takhakh, and Muhannad Al-Waily
    Elsevier BV

  • A Review Study on Measurement and Evaluation of Prosthesis Testing Platform during Gait Cycle within Sagittal Plane
    Saif M. J. Haider, Ayad M. Takhakh, and Muhannad Al-Waily
    IEEE
    The main problem with designing prostheses is the ability to assess newly manufactured devices on patients under unsafe conditions. Some of the issues that obstruct the testing process of the prosthetic limbs on amputees are informed consent, safety straps, and inadequate repetitiveness. This paper introduced a literature study regarding prosthesis testing platforms in which the sagittal plane is considered in all motions and forces. The article focused on the mechanical design, the actuator system, and the control strategies of test platforms to assess the functional characteristics of a prosthetic lower limb, such as the types of movements and loads, the technologies adopted, and the types of control techniques that have been used to design closed-loop motion. Furthermore, this study illustrated the performance test of a prosthetic limb through kinematic and kinetic measurement. In conclusion, these problems can be solved by utilizing robotic testing, which provides extra benefits that can be activated for a long time and working in environments that are dangerous for patients.

  • Improvement of buckling behavior of composite plates reinforced with hybrids nanomaterials additives
    Muhannad Al-Waily, Muhsin Jaber Jweeg, Mohsin Abdullah Al-Shammari, Kadhim K. Resan, and Ayad Murad Takhakh
    Trans Tech Publications, Ltd.
    Modifying buckling behavior of the composite structure has been investigated in the recent few years with different reinforcement fiber and powder materials and nanomaterials. It can be seen from previous studies that the addition of nanomaterials leads to a significant modification in the buckling behavior of structure by using a low mount of nanomaterials. In this work, reinforcement of composite materials using two types of nanomaterials together, SiO2 and Al2O3 nanomaterials, to modify the buckling behavior for plate structure is studied. Therefore, the investigation was done experimentally and numerically. The experimental work is performed by manufacturing composite plates with various weight fractions with the nanoeffect, and then their mechanical properties and buckling characterization were evaluated. The numerical work was done using the finite element method to estimate the plate structure’s buckling behavior with various nanomaterials effects. A comparison between the experimental and the numerical results for plate buckling behavior is expressed, showing that the discrepancy of the results was not more than 12.56%. Finally, the results showed that the buckling behavior for a reinforced plate was improved by 35% when two types of nanomaterials were used together.

  • Microstructure, mechanical and corrosion properties of the 50%Ni-47%Ti-3%Cu shape memory alloy
    Dania Fadhil Abbas, Kadhim Kamil Resan, and Ayad M. Takhakh
    IOP Publishing
    in this study, the mechanical, microstructure and corrosion properties of Nickel-Titanium-Copper shape recovery alloys were investigated. The alloy was prepared by the powder metallurgy method, where powders of 50% Titanium, 47 % Nickel and 3% Cupper were mixed and cold compacted at (600,700 and 800) MPa to form cylindrical samples of (11mm diameter × 16.5mm length) and (11mm diameter ×5 mm length). After compaction process the specimens had more green strength for handling. The samples were subsequently sintered at a temperature of (850,900 and 950) °C for a period of 5 hours in an electric vacuum tube furnace. Multiple tests were conducted on the alloys including porosity measurements, scanning electron microscopy (SEM), compression strength, shape memory effect and corrosion rate test. The results indicate improvement in compression strength and shape memory effect with low sintering temperature and high compacting pressure as well as reduction in the corrosion rate.

  • Study and optimization of the mechanical properties of PVP/PVA polymer nanocomposite as a low temperature adhesive in nano-joining
    Ahmed A. Taher, Ayad M Takhakh, and Sabah M Thahab
    IOP Publishing
    This paper presents a study of the effects of temperature, curing time and silver nano-particles (AgNPs) on the concentration of the PVP/PVA nano composites on shear force of adhesive nano-joining (ANJ). Low temperature (LT) ANJ of copper–copper (Cu–Cu) at the temperature values of 200, 215, 225, 240 and 275°C and curing times of 10, 20 and 30 minutes, under fixed pressure (5 MPa) are investigated. Higher shear strength value is found at a temperature value of 227 °C and time extent of 10 minutes. It is noted that for an AgNPs concentration of (5%wt) a maximum value of shear strength (2180N) is reached. These results indicate that resistance will increase with raising of the heat up to 227 °C, then followed by a decrease in strength up to 275 °C at a curing time of 10 minutes. The results have been optimized with Neural Network (NN) for accuracy.

  • Effect of friction stir processing parameters on the properties of AA7075-T73/Al2O3 surface metal matrix composite
    Ali H. Al-Helli, Ahmed R. Alhamaoy, and Ayad Murad Takhakh
    Trans Tech Publications, Ltd.
    Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics of the samples were examined using the optical microscope, SEM and hardness examination. Acquired consequences, showed that Al2O3 particles were in a good interior distribution inside the basement. This technique produced excellent bonding between the surface composite and the base material. On other hand the surface hardness was increased about 25% as compared with the substrate. In addition, grain matrix refinement and enhanced particle distribution were obtained after each FSP pass. Also the dispersion of Al2O3 particles in the stirred area became more homogeneous and the average hardness improved by increasing the number of passes.

  • Modeling and evaluation of smart economic transfemral prosthetic
    Fahad Mohanad Kadhim, Ayad Murad Takhakh, and Jumaa Salman Chiad
    Trans Tech Publications, Ltd.
    This study deals with evaluation of smart economic transfemral Prosthetic consist of a new design and manufacturing of knee joint and design and manufacture of a simple electronic circuit that is programmed to control the muscle pressure on the sensor during movement and transfer the voltage of force sensor after processing in microcontroller to the electric motor to flexion and extend the knee joint. A number of tests were carried out to evaluate the smart prosthetic. Gait cycle and EMG tests were performed on a patient with amputation above the knee in two cases, the first is when the patient is wearing the traditional limb and the second is when the patient is wearing the smart prosthetic. The results showed that the gait cycle during the wearing of the smart prosthetic is more acceptable, stable and balanced than the case of the traditional prosthetic wear. The results of EMG test showed that muscles need less effort during movement when wearing a smart limb and this indicates that the energy spent is less and thus provide comfort to the patient. The results of the finite element analysis (ANSYS 14.5) of the knee joint confirmed the strength of the joint and its ability to carry high weights for patients.

  • Effect of heat treatment on mechanical and vibration properties for 6061 and 2024 aluminum alloys


  • Mechanical properties of polymer with different reinforcement material composite that used for fabricates prosthetic socket
    Fahad M. Kadhim, Ayad M. Takhakh, and Asmaa M. Abdullah
    ZIbeline International Publishing


  • Design and Manufacturing Knee Joint for Smart Transfemoral Prosthetic
    Fahad M Kadhim, Jumaa S Chiad, and Ayad M Takhakh
    IOP Publishing
    A well-designed lower limb prosthesis is necessary in order to permit an amputee to repeat to healthy locomotion. The aim of this study is to enhance the passive prosthesis to a microcontroller-based transfemoral prosthesis which was unable to reach the designated rotational speed intended for a functional use, and had low cost. The enhancement focuses on designing a new mechanism on the knee joint by using a pre-existed DC motor, a socket, and the foot obtainable from the previous design. This involves mimicking the normal limb function and to improve the range of motion of this knee prosthesis. There are some criteria that required to be achieve at this study such as the new proposed knee joint should be able to flexion up to 90° and has enough strength to bear up the amputee's body weight. Solid Works software was used to design every single part of the knee joint. Then, each part will be assembled and the mechanism of the knee joint will be simulated for visualize the imagine motion of new model of hinged knee prosthesis. The materials (Aluminium Alloy 6061, Aluminium Alloy 7075 and AISI 4130 Steel) used were chosen by taking the consideration the cost and the properties of that material. By ANSYS computer program (Finite element analysis) was performed and the conclusion were evaluated to discover if the proposed prosthesis can bear certain loads. The results were discussed and evaluated the new model that suggested by this study.

  • A Study of the Mechanical Properties and Gait Cycle Parameter for a Below-Knee Prosthetic Socket
    Ayad M. Takhakh, Saif M. Abbas, and Aseel.K. Ahmed
    IOP Publishing
    This work involved an experimental study into the tensile and fatigue properties of selected below-knee prosthetic socket materials fabricated using a vacuum moulding technique. The composite materials were composed of number of carbon-fibre layers (8 layers) and carbon fibre with perlon layers (11 layers).The Ground Reaction Force (GRF), Center of Pressure (COP) and pressure distribution) for a patient of around 27years old of height 170cm and weight75kg were measured, and the results showed that the ultimate stress (Ϭult)for carbon fibrewas135 MPa, while for carbon fibre with perlon in an 80:20 matrix, it was 98 MPa.The fatigue limit for carbon fibre was 30 MPa and for carbon fibre with perlon it was 45 MPa. The data on gait cycle GRF was gained by using a force plate to measure pressure distribution using an F-socket, and these were collected using a patient with a below-knee amputation wearing a prosthetic of type BK. The internal pressure between the patient’s stump and the prosthetic socket was measured by using the F-socket Mat scan sensor; this reached its maximum value (52KPa) at both heel strike and toe off. Keyword. BK, Tensile, Fatigue, Force plate, F-socket, Perlon, Carbon Fibre.

RECENT SCHOLAR PUBLICATIONS

    Publications

    1. Ayad M. Takhakh, A.R.I. Kheder, N.M. Jubeh, "Fatigue Behavior Of Alloyed Acicular Ductile Iron", International Journal for the Joining of Materials, No.1, Vol. 17, 2005.
    2. Ayad M. Takhakh,A.R.I. Kheder,N.M. Jubeh, "Fatigue properties Under Constant Stress/Variable Stress Amplitude and Coaxing Effect of Acicular Ductile Iron and 42CrMo4 Steel", Jordan Journal of Mechanical and Industrial Engineering, Vol. 5, No. 4, , 2011.
    3. Ayad M. Takhakh, "Solidification Simulation and Experimental Investigation of Eutectic Al-Si Cast Structure", First scientific Conference For Mechanical and Electrical Eng. and Technologies, Technical College-Najaf. Iraq, 16-17/March, 2008.
    4. Akeel D. Subhi, Ayad M. Takhakh, "Simulation of Casting Solidification Parameters in Metallic Mould", Journal of Engineering, Baghdad University, , No.1, pp. 3482-3491, 2009.
    5. Ayad M. Takhakh, Ammar I. Saleh, "Microstructure Evolution of Hypoeutectic Al – Si Alloy Using Directional Solidification in Ceramic Mold", The Iraqi Journal for Mechanical and Material Engineering /Babylon University, No. 2, Vol. 10, , 2010.
    6. Mohamed A. Al-khateeb, Samer J. AL-Jodi, Ayad M. Takhakh, "Effect of Rotational Speed on Properties of 1060 Aluminum Friction Stir Welds", Scientific Conference For Technical College, Technical College-Najaf, Iraq, , 12-14/4/2010.
    7. Mohamed A. Al-khateeb, Samer J. AL-Jodi, Ayad M. Takhakh, "Effect of Tool Shoulder Diameter on The Mechanical Properties of 1200 Aluminum Friction Stir Welding", Journal of Engineering / Baghdad University, , No.6, pp. 1517-1523, 2011.
    8. A.R. I. Kheder, N. M. Jubeh, Ayad M. Takhakh, "Fatigue Properties Under Constant Stress/Variable Stress Amplitude And Coaxing Effect of Acicular Ductile Iron And 42 Crmo4 Steel", Jordan Journal of Mechanical and Industrial Engineering, Vol. 5, No. 4, pp. 301-306, 2011.
    9. Asmaa M. Abdullah, Ayad M. Takhakh, "An Experimental Investigation on Fatigue Properties of AA 3003-H14 Aluminum Friction Stir Welds", Journal of Engineering / Baghdad University, , No.6, , 2011.
    10. Adnan S. Jabur, Jalal M.Jalil, Ayad M. Takhakh, "Experimental Investigation and Simulation of Al–Si Casting Microstructure Formation", Arab J. for Sci. and Eng, DOI 10.1007/s13369-012-0189-2, Springer ,, 2012.
    11. Ayad M. Takhakh, Raied Z. Alfay, Abdul Rahim K. Abid Ali, " Prediction the Effect of Al Particle Size on Porosity And Hardness of Cu-Al-Ni Shape Memory Alloy Fabricated By Powder Metallurgy", The First National Conference for Engineering Sciences FNCES '12, 2012.
    12. Ayad M. Takhakh, Hamzah N. Shakir, "Experimental And Numerical Evaluation of Friction Stirs Welding of AA 2024-W Aluminum Alloy", Journal of Engineering / Baghdad University, No.6, , , 2012.
    13. Ayad M. Takhakh, Raied Z. Alfay, Abdul Rahim K. Abid Ali , "Effect of Ta Addition on Hardness and Wear Resistance of Copper Base Shape Memory Alloy Fabricated by Powder Metallurgy", 2013 IEEE Business Engineering and Industrial Applications Colloquium (BEIAC) , Malaysia, 7-9/April/2013.
    14. Ayad M. Takhakh, Raied Z. Alfay, Abdul Rahim K. Abid Ali , " Effect of Nb Addition on Hardness and Wear Resist of Cu-Al-Ni Shape Memory Alloy Fabricated by Powder Metallurgy", Journal of Engineering / Baghdad University, No.1, , , 2014.
    15. Ayad M. Takhakh, Asmaa M. A., " Crack Growth Rate of AA 3003-H14 aluminum alloy Friction Stir Welded", The Second Conference for College of Materials /Babylon University, 15-16/5/2013.
    16. Ayad M.Takhakh, Fahad M.Kadhim ,Jumaa S.Chiad, "Vibration Measurement and Analysis of knee-Ankle-Foot Orthosis (KAFO) Metal-Metal type", Journal of Engineering / Baghdad University, No.2, , , 2014.
    17. Ayad M.Takhakh, Fahad M.Kadhim ,Jumaa S.Chiad, " vibration Analysis in Knee-ankle-foot-orthosis for Both Metal And Plastic KAFO Type", ASME 2013 International Mechanical Engineering, USA, 15-21/12/2013.
    18. Ayad M.Takhakh, Fahad M.Kadhim ,Jumaa S.Chiad, "Vibration Measurement and Analysis of knee-Ankle-Foot Orthosis (KAFO) Plastic-Metal Type", Journal of Engineering and Development /AL-Mustansiriya University, NO.6, Vol 17, , 2013.
    19. Ali A. Aslman, Ayad M.Takhakh, Kadhim K. Resan, "Study The Mechanical Properties And Numerical Evaluation of Friction Stir Processing (FSP) For 6061-T6- Aluminum Alloys", Al-Nahrain University, College of Engineering Journal (NUCEJ), NO.2, , , 2016.
    20. Ali A. Aslman, Ayad M.Takhakh, Kadhim K. Resan, "Enhancements of Mechanical Properties of Friction Stir Welding For 6061 Aluminum Alloy By Friction Stir Processing (FSP) Method", First Basra International Conference for Mechanical Engineering, 8-10/4/2014.
    21. Sa’ed A. Shakir, Ayiad M. TAKAK, Esraa A.Abood, "Enhancement Physical and Mechanical Properties of Cu-Ai-Ni Shape Memory Alloys by Sn Addition", 9th International Symposium on Advanced Science and Technology in Experimental Mechanics, 1-6 November, New Delhi, India, 2014.
    22. Ali A. Aslman, Ayad M.Takhakh, Kadhim K. Resan, "Effect of Friction Stir Processing (FSP) to the Mechanical properties of 7075-T73 Aluminum Alloys plates Welded By Friction Stir Welding", Journal of Engineering and Development, NO.5, , , 2014.
    23. Muhsin J.Jweeg, Ayad M.Takhakh, Nawzad K.Kareem, "Comparison Between Friction Stir Welding (FSW) And Friction Stir Processing (FSP) Of Aa5086 Aluminium Alloy", International Journal of Technical Research and Applications,NO.6, Vol.3, , 2015.
    24. Dania Abbas, Kadhim K. Resan, Ayad M. Takhakh, "Microstructure and Mechanical Properties of Ni-Ti-Cu Shape Memory Alloys Biomaterials", ASME International Mechanical Engineering Congress and Exposition,Houston, Texas, USA, November 13-19, 2015 .
    25. Mohammed Rahman, Ayad M. Takhakh ,"An investigation to the Effect of Copper Addition on the Characteristics of Ni-Ti Shape Memory Alloy", Al-Nahrain University, College of Engineering Journal (NUCEJ), NO.1, , , 2016.
    26. Dania Abbas, Kadhim K. Resan, Ayad M. Takhakh," Optimization of Ni-Ti-Cu Shape Memory Effect Using Minitab Program", International Journal of Energy and Environment, NO.3, Vol.7, , 2016.
    27. Ayad M. Takhakh, "Formability of Friction Stir Welded And Processed AA 2024 – O Aluminum Alloy Sheets", Advances in Natural and Applied Sciences, No.1, , , 2016.
    28. Muhsin Jweeg ,Ayad M. Takhakh , Saif M. Abbas, "Characterization of Materials Used in Manufacturing The Ankle Foot Ortheses", International Journal of Energy & Environment ISSUE ON APPLIED MECHANICS RESEARCH, NO.4, Vol.8, , 2017.
    29. Ayad M. Takhakh, Hassanein Salih Hussain, "Manufacturing, Testing, and Numerical Modeling a Lower Limb Orthosis For a Patient That Has a Partial Foot Amputation", International Journal of Energy & Environment Issue On Applied Mechanics Research, NO.4, Vol.8, , 2017.
    30. Dania Abbas, Kadhim K. Resan, Ayad M. Takhakh, "Investigate the Microstructure and the Mechanical Properties of Ni-Ti-Cu Shape Memory Alloys", Al-Nahrain Journal for Engineering Sciences, NO.1, , , 2017.
    31. Ayad M. Takhakh, Harith Hammody Abdulla, " Improving the Mechanical Properties of Al7075-T651 Welded Joint Using Direct Friction Stir Processing", The Second Conference of Post Graduate Researches (CPGR'2017), College of Engineering, Al-Nahrain Univ., Baghdad, Iraq, 4 / Oct. 2017.
    32. Ayad M. Takhakh, Harith Hammody Abdulla ,"Surface Modification Of Aa 7075-T651 Plate Using Friction Stir Processing With Sic Particles", Emirates Journal for Engineering Research, , No.3, , 2017.
    33. Ayad M. Takhakh, Saif M.Abbas, Aseel.K. Ahmed, " Study The Mechanical Properties And Gait Cycle Parameter For Below Knee Prosthetic Socket", The Second International Conference of Engineering sciences / College of Engineering /Karbala University, 26-27 / March 2017.
    34. Ayad M. Takhakh," Manufacturing and Analysis of Partial Foot Prosthetic for The Pirogoff Amputation", International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS, Pakistan, , , 2018.
    35. Saif M. Abbas , Ayad M. Takhakh, Mohsin Abdullah Al-Shammari, Muhannad Al-Waily, "Manufacturing And Analysis Of Ankle Disarticulation Prosthetic Socket (Symes)", International Journal of Mechanical Engineering and Technology (IJMET), India, Vol.9 , 2018.
    36. Saif M. Abbas , Ayad M. Takhakh, "Manufacturing and Analysis of Carbon Fiber Knee Ankle foot orthosis", International Journal of Engineering &Technology, UAE, Vol.7, , 2018 .
    37. Ahmed A. Taher, Ayad M. Takhakh, "Experimental Study and Prediction the Mechanical Properties of Nano-Joining Composite Polymers", Journal of Engineering and Applied Sciences, Vol.3, , 2018.
    38. Ayad M. Takhakh , Saif M. Abbas, Aseel K. Ahmed, " Study of the Mechanical Properties and Gait Cycle Parameter for a Below-Knee Prosthetic Socket", 2nd International Conference on Engineering Sciences, IOP Conf. Series: Materials Science and Engineering, 2018.
    39. Fahad M., Jumaa S., Ayad M.Takhakh, "Design And Manufacturing Knee Joint for Smart TransfemoralProsthetic", International Conference on Materials Engineering and Science, 2018.
    40. Fahad Mohanad, Ayad M. Takhakh, Asmaa M. Abdullah, "Mechanical Properties Of Polymer With Different Reinforcement Material Composite That Used For Fabricates Prosthetic Socket", Journal of Mechanical Engineering Research and Developments 42(4):118-123, 2019.
    41. Fahad Mohanad, Ayad M. Takhakh, Jumaa Salman Chiad, "Modeling and Evaluation of Smart Economic Transfemral Prosthetic", Defect and Diffusion Forum 398:48-53, 2020.
    42. Suhair G. Hussein, Mohsin Abdullah Al-Shammari , Ayad M. Takhakh, Muhannad Al-Waily, "Effect of Heat Treatment on Mechanical and Vibration Properties for 6061 and 2024 Aluminum Alloys", Journal of Mechanical Engineering Research and Developments 43(1):48-66, 2020.
    43. Ahmed Taher , Ayad M. Takhakh , S. M. Thahab, "Study and optimization of the mechanical properties of PVP/PVA polymer nanocomposite as a low temperature adhesive in nano-joining", IOP Conference Series Materials Science and Engineering 671:012145, 2020.
    44. Dania Fadhil Abbas , Kadhim K. Resan , Ayad M. Takhakh, "Microstructure, mechanical and corrosion properties of the 50%Ni-47%Ti-3%Cu shape memory alloy", IOP Conference Series Materials Science and Engineering 671:012142. 2020.
    45. Ali Hussein mohammed alhilli Alhelli , Ahmed Riedh Al Hamaoy , Ayad M. Takhakh, "Effect of Friction Stir Processing Parameters on the Properties of AA7075-T73/Al2O3 Surface Metal Matrix Composite", Materials Science Forum 1002:140-150, 2020.