Professor and Mechanical Engineering
Sri Venkateswara College of Engineering and Technology
completed his PhD from Jawaharlal Nehru Technological University, Anantapur in 2011. He completed his ME from Annamalai University, Chidambaram in 2001. He completed 3 sponsored research projects and 10 other sponsored projects total worth of 1.5 crore. He filed and published 3 patents in Indian patent office. He published more than 102 papers in conference proceedings and journals in addition to the 2 book chapters. He is guiding 3 research scholars in various universities.
PhD Mechanical Engineering
ME Production Engineering
BE Mechanical Engineeing
Additive Manufacturing, Machining studies
The unemployment of engineering graduates is a big threat to our nation and the COIVD-19 has boosted unemployment further. The engineering colleges are producing more the 15 Lakhs of engineers every year in India. They are coming out with a good percentage of marks. However, the employability skill for the engineering student is very poor. This is due to a lack of an appropriate teaching-learning process. The students have used their memory for preparing the subject to fulfill the need for the examination. The majority of the students have a practice of preparing the subject one or two days before the examination. The teachers are struggling to engage the student with lectures. Particularly, millennial students more attracted to mobile, laptops, tablets, and wasting their precious time by playing video games chatting on Facebook, Twitter and WhatsApp. The Future of job report, World Economic Forum states that creativity, critical thinking and, research skills are the most demanded skil
P. Kumar, A. Mahamani, and B. Durga Prasad Elsevier BV
A. Mahamani, S. Jawahar and J. Davim
In-situ composites are gained the attention of worldwide researchers in the interest of its greater mechanical properties at the lower reinforcement ratio. Controlling the surface quality of the component is a paramount task in grinding process in order to withstand the creep and fatigue load at service conditions. The current effort is intended to examine the mechanism of surface generation in grinding of AA6061-TiB2/ZrB2 in-situ composites under different reinforcement ratio, grinding parameters and wheel materials. The analysis of results indicates that the grinding of unreinforced alloy is complicated than the composites. Diamond wheel yields superior performance by generating lesser surface roughness and subsurface hardness at all grinding conditions. Among the various grinding parameters, grinding speed and grinding depth are more sensitive than other parameters. This experimental investigation helps to control the surface roughness and subsurface at various grinding conditions. Understanding of surface generation mechanism in grinding of in-situ composites helps to employ the grinding process for economic machining rate without negotiating the surface quality.
Ismail Kakaravada, A. Mahamani and V. Pandurangadu
In the present investigation, A356-TiB2/TiC composites with a various reinforcement ratios (0, 2.5, 5 and 7.5%) were synthesized through a K2TiF6-KBF4-Graphite (C) reaction system. Formation of TiB2 and TiC particulates and their distribution are confirmed by various characterization techniques. The tensile properties such as ultimate strength, yield strength, young’s modulus and percentage of elongation in addition to their failure behavior of were studied at ambiant and high temperatures (100, 200 and 3000C). The increment in the volume fraction of the composite raised the hardness and the enhancement of hardness was reported up to 49% at 7.5% reinforced composite due to the strengthening effect. The density and porosity of fabricated composites were investigated. The rise in the volume fraction of reinforcement phase decreased the density and increased the porosity of composite samples. Further, the ultimate strength, yield strength, young’s modulus declined with the rise in the temperature. Result analysis also illustrates that the 7.5% reinforced composite retained the ultimate strength up to 84.4% and the ductility was raised by 27% at 3000C. Yield strength and young’s modulus were also retained 74.31% and 71.09% respectively at the similar material and experimental conditions. The fracture surface analysis of the composites showed that, the ductile nature of failure appearance microscopically with the formation of fine dimples and voids on fracture surface at elevated temperatures. Cleavage facets and tear crumples observation indicated the brittle kind of failure at the ambient temperature. Findings from the experimental study provide the tensile behavior of the composites at the regular working temperature of the automobile engine piston.
Ismail Kakaravada, A. Mahamani, and V. Pandurangadu Inderscience Publishers
Penumuru Kumar, Arumugam Mahamani, and B. Durga Prasad Trans Tech Publications, Ltd.
In the present scenario, the industries are looking for creating the model quickly and making the prototype. Additive manufacturing (AM) is a rising technology for a hefty choice of applications. This route has plenty of advantages such as the availability of a wide range of materials, fabrication speed and resolution of the final components. The current paper deals with the review of the recent developments in additive manufacturing methods and their applications. Further, the discussion has been made about the various materials used for additive manufacturing such as ceramic, polymer, composites and biomaterials. The survey denotes that fused deposition modeling has received the widespread attention of the researchers. Finally, some of the gaps in the research are found and reported.
A Mahamani and S Jawahar IOP Publishing
In-situcomposite material synthesis has been widely recognized by the researchers owing tofine particle size, clean interface, and smart wettability of the reinforcement with the matrix.Variation of wheel speed, work speed, depth of cut and feed rate on grindability of AA6061-5%TiB2/ZrB2 in-situ composite are investigated.The present work is aimed to investigate the Grinding force and grinding temperature of the AA6061-TiB2/ZrB2 in-situ composite under various grinding parameters and wheel materials. A hike of wheel speed decreases the grinding force an increase in temperature. Increase in work speed, depth of cut and feed rate increase the grinding force and grinding temperature. This experimental investigation helps to control the grinding force and grinding temperature at the various grinding condition.
Ismail Kakaravada, A. Mahamani, and V. Pandurangadu IOP Publishing
This study presents the multi-performance analysis in drilling of A356-TiB2/TiC in-situ composite produced through stir casting route. A novel Entropy-VIKOR approach is adopted for the optimization of parameters in drilling like spindle speed, drill diameter and % of reinforcement over the MRR, delamination and surface roughness. Experiments were conducted on vertical machining centre by using of carbide drills followed by Taguchi L27 orthogonal array. The Entropy weight measurement method was used to evaluate individual weights of each response. For the multi responses optimization VIKOR indexing method was adopted. In this paper, the multi-objective responses are converted as a single VIKOR index, and the ANOVA was performed for VIKOR index to determine the influence parameter for drilling. Finally, confirmation experiment was performed and validated using the regression equation to recognize the effectiveness of proposed method. Result of ANOVA indicates that reinforcement ratio has strongest influence on VIKOR index.
A Mahamani, P Kumar, K Ismail, S Jawahar, T Chiranjeevi Reddy, T Vijayasai, T Venkata Phaneendra, V Uday sankar, and V Gopi chandu IOP Publishing
3D printing refers to process used to create a 3D object in which the material is joined or solidified with materials being added together. 3D printing Prototyping and tooling to direct part manufacturing in industrial sectors such as architectural, medical, dental, aerospace, automotive, furniture and jewellery are the potential applications of the additive manufacturing. This study describes certain aspects that must be controlled in and around an entry-level rapid prototyping 3-dimensional technology platform to investigate printing quality and optimization of the process. PLA (Poly Lactic Acid) material is to be used for making components. Printing speed, Layer thickness and Fill density are selected as 3D printing process parameters whereas component hardness and surface roughness are selected as responses. L9 layout is too followed for experimentation. Taguchi method is to be employed for the optimisation. Result of the study shows that, the longer thickness and printing speed are most influential parameters in developing surface roughness and component hardness respectively.
Ismail Kakaravada, A. Mahamani, and V. Pandurangadu Springer Singapore
A. Mahamani and V. V. Anantha Chakravarthy Springer Singapore
P. Sneha, A. Mahamani, and Ismail Kakaravada Elsevier BV
A. Mahamani and V. V. Anantha Chakravarthy Informa UK Limited
ABSTRACT Laser beam machining is considered as economic machining process to machine the composite materials. AA6061-TiB2/ZrB2 in situ composites are drilled by using Ytterbium fiber laser machine with input parameters as laser trepanning speed, laser power, and standoff distance. Entry diameter, exit diameter, and taper are responses which are to be measured by metallurgical microscope. The contribution of the paper is to analyze the influence of reinforcement ratio of the composites and machining parameters on the responses. Analysis of the results shows that the entry and exit diameters and taper of unreinforced alloy are less than the composites for all the experimental conditions. Increase in laser trepanning speed decreases the entry and exit diameters whereas increases the taper of the laser drilled hole. Increase in laser power enlarges the entry and exit diameters but reduces the taper of the hole. The increase in the standoff distance reduces the entry and exit diameters of the hole. This investigation helps to find the suitable machining parameters for attaining the desired accuracy of laser drilled holes.
A. Mahamani, A. Jayasree, K. Mounika, K. Reddi Prasad, and N. Sakthivelan Inderscience Publishers
Aluminium matrix composites are considered as a multi-property material system and this can be tailorable to suit the specific applications. In-situ synthesis is one of the methods to fabricate the composite with high inter-facial strength, increased wettability and cluster-free reinforcements. AA6061-TiB2/ZrB2 in-situ metal matrix composites are synthesised by K2TiF6-KBF4-K2ZrF6 reaction. Presence of the reinforcing phases is confirmed by energy dispersive X-ray analysis and scanning electron microscopic analysis. The objective of this paper is to study the influence of in-situ formed TiB2 and ZrB2 on mechanical properties and wear rate per percentage of the reinforcement. Experimental result shows that the inclusion of the reinforcement particles increases the mechanical properties and we note the significant improvement on wear rate per percentage of the reinforcement. Fracture surface investigation is carried out to identify the mode of failure of the composites due to the tensile load.
Arumugam Mahamani, N. Sakthivelon, Sai Kumar Jetti, M. Vijay Sekar Reddy, P. Vamsi Krishna Naidu, M. Rithesh, and K. Veeranagaiah Trans Tech Publications, Ltd.
In-situ aluminum matrix composites have good bonding strength and homogeneous distribution of particles, which offer improved mechanical property and wear resistance. Electrical discharge machining is considered as a suitable process for making complicated shape of difficult to machine materials. In this experimental work AA6061-6% TiB2/ZrB2in-situ metal matrix composite was fabricated using flex assisted synthesis. This experimental investigation is focused to study the influence of electrical discharge machining process parameter on surface roughness in machining of the AA6061-6% TiB2/ZrB2composite. Taguchi method and L9orthogonal lay out are applied to conduct the experimental work. Analysis of variance was performed to evaluate the percentage of contribution of each parameter. The analysis of the result indicates that discharge current has strongest influence on the surface roughness. This experimental study helps to select the optimal machining parameter to achieve good surface finish.
A. Mahamani, N. Muthukrishnan, and V. Anandakrishnan IGI Global
In-situ aluminum matrix composite is the innovation of high performance material technology and it has superior interfacial integrity and thermodynamic stability between the matrix and reinforcement. During synthesis, the ZrB2 particle is formed by exothermic reaction within the aluminum melt. As a result, small, fine and oxide free reinforcements are formed. Excessive temperature released from in-situ chemical reaction will facilitate the homogeneous distribution of particles in entire shape of the composites. Making the engineering components from this composite material require machining operations. Therefore, addressing the machinability issues of the composite is very important. This paper proposes an approach to optimize the machining parameters in turning of Al 6061-6% ZrB2 in-situ Metal Matrix Composite (MMC) with multiple performance characteristics by using grey relational analysis. The effect of in-situ ZrB2 reinforcement particles on machinability behavior need to be studied. The machining parameters, namely cutting speed, feed rate and depth of cut are optimized with considerations of multiple performance characteristics including surface roughness, tool wear and cutting force. It is concluded that the feed rate has the strongest effect. The confirmation experiment indicates that there is a good agreement between the estimated value and experimental value of the Grey relational grade.
V. Anandakrishnan and A. Mahamani Springer Science and Business Media LLC
A Mahamani, A Karthik, S Karthikeyan, P Kathiravan, and Y P Kumar IEEE
Composite material technology has been developed to explore the best advantage of metallic and ceramic material characteristics. Among the various processing route, flex assisted synthesis is a highly potential and low cost method to produce in-situ composites. In-situ aluminum matrix composite has superior performance than the ex-situ composite because of the chemically dispersed reinforcements. In the present work, flex assisted synthesis process is to produce AA2219 — TiB2/ZrB2 in-situ aluminum matrix composite with the different reinforcement ratio. EDAX, SEM and micro hardness analysis was carried out to confirm the presence reinforcements. EDAX analysis confirms the presence of reinforcement and element percentage of the composites. Microstructure analysis shows the distribution of in-situ reinforcements and the CuAl2 formation in the grain boundary regions of the matrix. Increase in hardness observed in the composites than the AA2219 matrix, reveals the presence of the reinforcement.
A. Mahamani, K. Prahlada Rao, and V. Pandurangadu Inderscience Publishers
Inventory control is one way to increase profit margins without altering resources. A spreadsheet model was developed for the inventory control of packaging material in a real case study from a fruit juice manufacturing firm. The contribution of this paper is the construction of a spreadsheet model that incorporates a dynamic re-order point policy logic; using the result from the spreadsheet-based approach and analytical approximation method, a best alternate ordering policy for a single-echelon supply chain can be developed by the statistical analysis of the dynamic re-order point, static re-order point and existing ordering policies and the flexibility of the optimal ordering policy was evaluated using a randomly generated demand. The objective of this work is to develop the best ordering policy with a low total inventory cost to ensure a better service efficiency level across a single-echelon supply chain. The reduction in the total inventory costs obtained from the spreadsheet-based approach is compared with the analytical approximation method. This paper provides a basic understanding with respect to the development of an ordering policy for a single-echelon supply chain.
No of research papers published in International Journal 38
No of research papers published in National Journal 13
No of research papers published in International Conference 16
No of research papers published in National Conference 33
TOTAL : 100
SCOPUS/Web of science indexed 20
DST-Young scientist Grindability studies on AA6061-TiB2/ZrB2 in-situ Composites
UGC –Research award Influence of macro, micro and nano size reinforcement on machinability behavior of the AA6061-AlN
UGC-Minor research projects Studies on drilling of AA6061-TiC in-situ composites
DST-FIST Level 0 for Establishment of “Centre for Materials Development and Testing”
Electrical energy recycling fan
Single cavity fixture with nested location
Combined Water Level Indicator and Door Bell