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Journal of Mechanics, 2017 Mechanical properties of the metals and their alloys are influenced by the material grain size at microscale. In the present study, the Johnson-Cook (JC) material model is modified to incorporate the effect of material's grain size along with the ...
Hassan Ijaz, Waqas Saleem, M Asad
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A modified Johnson-Cook model with damage degradation for B4Cp/Al composites
Composite Structures, 2022Abstract In this investigation, the dynamic compression tests of 25 vol% and 55 vol% B4C/2024Al composites were conducted in a wide range of strain rates (1000–5000/s) and temperature (298–723 K). The true stress-true strain curves show that the composites have obvious strain softening during plastic deformation.
Z.L. Chao +7 more
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A modified Johnson-Cook model of 6061-T6 Aluminium profile
Australian Journal of Mechanical Engineering, 2020The flow behaviour of the 6061-T6 aluminium profile in different specimen directions at different strain rates was studied by the tensile test.
Guoqing Geng +3 more
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Optimization of Milling Aluminum Alloy 6061-T6 using Modified Johnson-Cook Model
Simulation Modelling Practice and Theory, 2021Abstract Finite element (FE) simulation is an efficient and time-saving method to optimize the high-speed machining process of aluminum (Al) alloy. The constitutive model accurately described the dynamic mechanical behavior of materials at cutting conditions is the premise of obtaining high-precision simulation results. In this study, the flow stress-
Suyang Li +5 more
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A modified Johnson–Cook constitutive model for titanium alloy TA31 and its implementation into FE
Materials Testing, 2023Abstract The accuracy of high-temperature constitutive models is essential for the establishment and optimization of thermomechanical processing, and is one of the most relevant factors determining the reliability of finite element simulation results.
Pei Liang, Jie Zhang, Ning Kong
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A Modified Johnson-Cook Model for Rotating Band Considering a Wide Range of Temperature
2018 IEEE International Conference on Mechatronics and Automation (ICMA), 2018In processing, the rotating band is subject to complex loading history and its property is different from annealed copper. The flow stress of rotating band is sensitive to temperature and strain rate. There is a mutation in 673K to 773K, and most of constitutive models don't take this phenomenon into consideration.
Yicheng Zhu +3 more
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A modified Johnson Cook model for elevated temperature flow behavior of T24 steel
Materials Science and Engineering: A, 2013Abstract The isothermal hot compression tests were carried out on Gleeble-3500 thermo mechanical simulator in the temperature range of 1323–1473 K and strain rates of 0.01 s−1, 0.1 s−1, 1 s−1 and 10 s−1. Based on the experimental results, a modified Johnson Cook model is proposed to describe the flow behavior of T24 steel.
Hong–Ying Li +3 more
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Perforation of steel and aluminum targets using a modified Johnson–Cook material model
Nuclear Engineering and Design, 2012Abstract Numerical perforation studies involving finite element method (FEM) suffer from severe mesh distortion problem when subjected to large deformation in high velocity projectile impact cases. Severe element distortion causes negative volume problem and introduces numerical errors in the simulated results.
Z.S. Liu, S. Swaddiwudhipong, M.J. Islam
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PENETRATION OF CONCRETE TARGETS USING A MODIFIED HOLMQUIST–JOHNSON–COOK MATERIAL MODEL
International Journal of Computational Methods, 2012For concrete target penetration and/or perforation simulation, the Holmquist–Johnson–Cook (HJC) material model is widely used as concrete material model. However, the strain rate expression of the model has failed to explain the sudden increase in concrete strength at high strain rates.
M. J. ISLAM +2 more
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Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2016
Results of materials testing for lead-free brass show that the effect of thermal softening decreases significantly when the strain rate is high. This behavior is referred to as thermal softening damping. In this article, a flow stress model with thermal softening damping based on the Johnson–Cook flow stress model was developed.
Laakso, Sampsa Vili Antero, Niemi, Esko
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Results of materials testing for lead-free brass show that the effect of thermal softening decreases significantly when the strain rate is high. This behavior is referred to as thermal softening damping. In this article, a flow stress model with thermal softening damping based on the Johnson–Cook flow stress model was developed.
Laakso, Sampsa Vili Antero, Niemi, Esko
openaire +2 more sources