• Sheet Metal Forming
• Material Modelling and Characterization
• Finite Element Analysis
• Machine Design, Product Design & Development
• Fracture Mechanics and Damage Modelling
• Warm and Hot Forming of Advanced High Strength Materials
An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures Gauri Mahalle, Nitin Kotkunde, Amit Kumar Gupta, Swadesh Kumar Singh Journal of Strain Analysis for Engineering Design, 2022 Wrinkling is generally induced because of metal instability and considered as an undesirable defect in sheet metal forming processes. Wrinkling leads to severe influence on functional requirements and aesthetic appeal of final component. Thus, the present research is mainly dedicated on the experimental and numerical analysis for wrinkling behavior prediction of Inconel 718 alloy at elevated temperature conditions. Initially, Yoshida buckling tests (YBT) have been conducted to investigate wrinkling tendencies of Inconel 718 alloy from room temperature (RT) to 600°C by an interval of 200°C. Subsequently, Finite Element (FE) analysis of YBT has been performed to analyze post buckling behavior. Critical strain values at onset of wrinkling are determined and strain based wrinkling limit curves (ε-WLCs) are plotted at different temperatures. In-plane principal strains are transferred to effective plastic strain (EPS) versus triaxiality (η) space to differentiate the transformation between safe and wrinkling instability. Finally, complete forming behavior of alloy is represented by means of fracture, forming, and wrinkling limit curves. The gap between forming and wrinkling limit curves at elevated temperature is ∼1.5 times higher than that at room temperature.
Analysis of material properties and strain hardening behaviour of brass at different temperature and quasi-static strain rate conditions V. Dharam Singh, Gauri Mahalle, Nitin Kotkunde, Swadesh Kumar Singh, M. Manzoor Hussain Advances in Materials and Processing Technologies, 2022 The α-Brass alloy is gaining special attention for electrical and thermal conductivity applications because of being easily formed/workability and retaining high strength after forming. This makes crucial to understand the plastic deformation behaviour and work hardening behaviour of a material for reliable finite element simulations. In present study, the hot uniaxial tensile flow stress analysis of α-Brass alloy thin sheet has been carried out under a quasi-static strain rates of 0.1–0.001/s at the temperature range of 300 K–773 K. Flow stress behaviour has significantly affected with test temperatures, strain rates and sheet orientations. Anisotropy in terms of yield stress variation and % elongation by in-plane anisotropy and Anisotropy index have been evaluated. Further, stress–strain relation has been analysed by popular empirical strain hardening equation namely, Hollomon and Swift. The work hardening behaviour of alloy has been well-defined by Swift relationship compare to Hollomon empirical relation.
Comparative assessment of failure strain predictions using ductile damage criteria for warm stretch forming of IN718 alloy Gauri Mahalle, Nitin Kotkunde, Amit Kumar Gupta, Swadesh Kumar Singh International Journal of Material Forming, 2021 It is vital to envisage accurately the fracture limits of high strength superalloys when noticeable localized necking or thinning tendency is not observed during sheet-metal stretch forming process. The present study mainly focuses on fracture limits evaluation of Inconel 718 alloy (IN718) in the effective plastic strain (EPS) vs. average triaxiality space. First, uniaxial tensile test, to analyze the material properties, were instigated at different test temperatures (RT-700 °C). Subsequently, stretch forming is performed to evaluate forming and fracture forming limit diagrams (FLD and FFLD) of IN718 using Nakazima test. It is observed that forming and fractured limits of IN718 are significantly influenced by variation of processing temperatures (with approximately 65–70% improvement in major safe and fracture strains) in all deformation regions (with respect to RT). In average triaxiality (η) vs effective plastic strain (EPS) space, higher fracture limits of IN718 are noticed in the entire triaxiality path of deformation region. Seven different ductile fracture models, namely McClintock (M-Mc), Brozzo, Rice-Tracey (R-T), Ko, Oh, Cockcroft and Latham (C-L), and Clift, are formulated so as to foresee the fracture loci of IN718 in EPS vs. triaxiality space. Overall, Oh model, showed best predictability at all temperatures with least Average absolute error (AAE < 13.5%).
Integrated Johnson–Cook and Zerilli–Armstrong constitutive model for flow-stress prediction of AZ31B alloy A Jaimin, G Mahalle, N Kotkunde, SK Singh Advances in Materials and Processing Technologies 10 (4), 3147-3156 , 2024 2024 Citations: 7
Deformation behaviour and formability analysis of thin brass sheet: experiments and modelling VD Singh, G Mahalle, MM Hussain, N Kotkunde, SK Singh Australian Journal of Mechanical Engineering 22 (2), 296-313 , 2024 2024 Citations: 3
Analysis of tensile deformation behaviour of dual phase-590 steel at different temperatures and strain rates K Seshacharyulu, G Mahalle, N Kotkunde, SK Singh, BB Naik Advances in Materials and Processing Technologies 8 (sup3), 1647-1663 , 2022 2022 Citations: 4
Analysis of material properties and strain hardening behaviour of brass at different temperature and quasi-static strain rate conditions VD Singh, G Mahalle, N Kotkunde, SK Singh, MM Hussain Advances in Materials and Processing Technologies 8 (sup3), 1533-1542 , 2022 2022 Citations: 8
Forming and Fracture Limit Diagrams of Inconel 718 Alloy at Elevated Temperatures G Mahalle, N Kotkunde, AK Gupta, SK Singh Metal Forming Processes, 151-167 , 2022 2022 Citations: 1
An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures G Mahalle, N Kotkunde, A Kumar Gupta, S Kumar Singh The Journal of Strain Analysis for Engineering Design 57 (6), 459-475 , 2022 2022 Citations: 9
Strain and Stress-Based Forming Limit Diagrams for Inconel 718 Alloy G Mahalle, P Takalkar, N Kotkunde, AK Gupta, SK Singh NUMISHEET 2022:Proceedings of the 12th International Conference and Workshop … , 2022 2022 Citations: 3
Prediction of Hot Deformation Behaviors Under Multiaxial Loading Using Gurson-Tvergaard-Needleman Damage Model for Inconel 718 Alloy Thin Sheet G Mahalle, N Kotkunde, AK Gupta, SK Singh, CP Nikhare ASME 2021 International Mechanical Engineering Congress and Exposition 2 , 2022 2022
Application of Deep Learning models to characterize manufacturing defects in additive manufactured components S Dey, Z Lyu, G Mahalle, A Achouri, A Al Mamun Procedia Structural Integrity 42, 943-951 , 2022 2022 Citations: 5
Investigation of strain-rate sensitivity of T91 Steel Using Small Punch Testing G Mahalle, TP Davis, WE Lee, A Al Mamun Procedia Structural Integrity 42, 570-577 , 2022 2022 Citations: 1
Efficacy of semi-empirical models for prediction of forming limit curve of IN718 alloy at elevated temperatures G Mahalle, N Kotkunde, AK Gupta, SK Singh Advances in Materials and Processing Technologies 7 (4), 617-629 , 2021 2021 Citations: 9
High temperatures deformation and formability behavior of DP590 steel: Mechanical characterization and modeling K Seshacharyulu, G Mahalle, N Kotkunde, SK Singh, B Balu Naik Journal of the Brazilian Society of Mechanical Sciences and Engineering 43 … , 2021 2021 Citations: 14
Comparative assessment of failure strain predictions using ductile damage criteria for warm stretch forming of IN718 alloy G Mahalle, N Kotkunde, AK Gupta, SK Singh International Journal of Material Forming 14 (5), 799-812 , 2021 2021 Citations: 11
Experimental and Numerical Analysis of Forming, Fracture and Wrinkling Limit Diagrams for Inconel 718 Alloy at Elevated Temperatures G Mahalle Birla Institute Of Technology and Science, Pilani - Hyderabad Campus , 2021 2021
Fracture limit analysis of DP590 steel using single point incremental forming: experimental approach, theoretical modeling and microstructural evolution S Pandre, A Morchhale, G Mahalle, N Kotkunde, K Suresh, SK Singh Archives of Civil and Mechanical Engineering 21 (3), 95 , 2021 2021 Citations: 33
An improved M–K model coupled with different ductile criteria for fracture limit predictions of Inconel 718 alloy G Mahalle, N Kotkunde, AK Gupta, SK Singh Journal of Materials Research and Technology 11, 1162-1174 , 2021 2021 Citations: 19
Study of Khan-Huang-liang (KHL) anisotropic deformation model for deep drawing behaviour of inconel 718 alloy G Mahalle, O Salunke, N Kotkunde, A Kumar Gupta, SK Singh IOP Conference Series: Materials Science and Engineering 967 (1), 012054 , 2020 2020 Citations: 6
Forming and fracture limits of IN718 alloy at elevated temperatures: Experimental and theoretical investigation G Mahalle, A Morchhale, N Kotkunde, AK Gupta, SK Singh, YC Lin Journal of Manufacturing Processes 56, 482-499 , 2020 2020 Citations: 57
Prediction of flow stress behaviour by materials modelling technique for Inconel 718 alloy at elevated temperature G Mahalle, N Kotkunde, AK Gupta, SK Singh Advances in Materials and Processing Technologies , 2020 2020 Citations: 23
Anisotropic Yielding Behaviour of Inconel 718 Alloy at Elevated Temperatures G Mahalle, O Salunke, N Kotkunde, AK Gupta, SK Singh ASME 2019 International Mechanical Engineering Congress and Exposition , 2020 2020 Citations: 10
MOST CITED SCHOLAR PUBLICATIONS
Neural network modeling for anisotropic mechanical properties and work hardening behavior of Inconel 718 alloy at elevated temperatures G Mahalle, O Salunke, N Kotkunde, AK Gupta, SK Singh Journal of Materials Research and technology 8 (2), 2130-2140 , 2019 2019 Citations: 67
Forming and fracture limits of IN718 alloy at elevated temperatures: Experimental and theoretical investigation G Mahalle, A Morchhale, N Kotkunde, AK Gupta, SK Singh, YC Lin Journal of Manufacturing Processes 56, 482-499 , 2020 2020 Citations: 57
Microstructure characteristics and comparative analysis of constitutive models for flow stress prediction of Inconel 718 alloy G Mahalle, N Kotkunde, AK Gupta, R Sujith, SK Singh, YC Lin Journal of Materials Engineering and Performance 28 (6), 3320-3331 , 2019 2019 Citations: 48
Fracture limit analysis of DP590 steel using single point incremental forming: experimental approach, theoretical modeling and microstructural evolution S Pandre, A Morchhale, G Mahalle, N Kotkunde, K Suresh, SK Singh Archives of Civil and Mechanical Engineering 21 (3), 95 , 2021 2021 Citations: 33
Analysis of Hot Anisotropic Tensile Flow Stress and Strain Hardening Behavior for Inconel 625 Alloy CA Badrish, N Kotkunde, G Mahalle, SK Singh, K Mahesh Journal of Materials Engineering and Performance, 1-17 , 2019 2019 Citations: 33
Cowper-Symonds Strain Hardening Model For Flow Behaviour Of Inconel 718 Alloy Gauri Mahalle, Nitin Kotkunde, Amit Kumar Gupta, Swadesh Kumar Singh Materials Today: Proceedings 18 (7), 2796-2801 , 2019 2019 Citations: 26
Prediction of flow stress behaviour by materials modelling technique for Inconel 718 alloy at elevated temperature G Mahalle, N Kotkunde, AK Gupta, SK Singh Advances in Materials and Processing Technologies , 2020 2020 Citations: 23
An improved M–K model coupled with different ductile criteria for fracture limit predictions of Inconel 718 alloy G Mahalle, N Kotkunde, AK Gupta, SK Singh Journal of Materials Research and Technology 11, 1162-1174 , 2021 2021 Citations: 19
High temperatures deformation and formability behavior of DP590 steel: Mechanical characterization and modeling K Seshacharyulu, G Mahalle, N Kotkunde, SK Singh, B Balu Naik Journal of the Brazilian Society of Mechanical Sciences and Engineering 43 … , 2021 2021 Citations: 14
Analysis of flow stress behaviour of inconel alloys at elevated temperatures using constitutive model G Mahalle, N Kotkunde, R Shah, AK Gupta, SK Singh Journal of Physics: Conference Series 1063 (1), 012037 , 2018 2018 Citations: 12
Comparative assessment of failure strain predictions using ductile damage criteria for warm stretch forming of IN718 alloy G Mahalle, N Kotkunde, AK Gupta, SK Singh International Journal of Material Forming 14 (5), 799-812 , 2021 2021 Citations: 11
Anisotropic Yielding Behaviour of Inconel 718 Alloy at Elevated Temperatures G Mahalle, O Salunke, N Kotkunde, AK Gupta, SK Singh ASME 2019 International Mechanical Engineering Congress and Exposition , 2020 2020 Citations: 10
An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures G Mahalle, N Kotkunde, A Kumar Gupta, S Kumar Singh The Journal of Strain Analysis for Engineering Design 57 (6), 459-475 , 2022 2022 Citations: 9
Efficacy of semi-empirical models for prediction of forming limit curve of IN718 alloy at elevated temperatures G Mahalle, N Kotkunde, AK Gupta, SK Singh Advances in Materials and Processing Technologies 7 (4), 617-629 , 2021 2021 Citations: 9
Analysis of material properties and strain hardening behaviour of brass at different temperature and quasi-static strain rate conditions VD Singh, G Mahalle, N Kotkunde, SK Singh, MM Hussain Advances in Materials and Processing Technologies 8 (sup3), 1533-1542 , 2022 2022 Citations: 8
Analysis of hot workability of Inconel alloys using processing maps G Mahalle, N Kotkunde, AK Gupta, SK Singh Advances in Computational Methods in Manufacturing: Select Papers from ICCMM … , 2019 2019 Citations: 8
Integrated Johnson–Cook and Zerilli–Armstrong constitutive model for flow-stress prediction of AZ31B alloy A Jaimin, G Mahalle, N Kotkunde, SK Singh Advances in Materials and Processing Technologies 10 (4), 3147-3156 , 2024 2024 Citations: 7
Study of mechanical properties and microstructural analysis for inconel alloy sheet at elevated temperature G Mahalle, N Kotkunde, AK Gupta, SK Singh Materials Today: Proceedings 5 (9), 18016-18023 , 2018 2018 Citations: 7
Study of Khan-Huang-liang (KHL) anisotropic deformation model for deep drawing behaviour of inconel 718 alloy G Mahalle, O Salunke, N Kotkunde, A Kumar Gupta, SK Singh IOP Conference Series: Materials Science and Engineering 967 (1), 012054 , 2020 2020 Citations: 6
Application of Deep Learning models to characterize manufacturing defects in additive manufactured components S Dey, Z Lyu, G Mahalle, A Achouri, A Al Mamun Procedia Structural Integrity 42, 943-951 , 2022 2022 Citations: 5