Spatial Constitutive Modeling of AA7050-T7451 with Anisotropic Stress Transformation

Wang, Zhenda; Fu, Xiuli; Xu, Nianwei; Pan, Yaokun; Zhang, Yijia

doi:10.3390/ma15175998

Cited by 2 publications

(1 citation statement)

References 44 publications

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“…Depending on a particular problem being solved and on the availability of relevant experimental data, the effects of a material stress state, strain rate, temperature, and other factors may be implemented into the plasticity and/or fracture parts of a material model, no matter whether it is coupled or uncoupled. As a result, despite their less sound physical basis, uncoupled models are much more popular in research and engineering practice [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Dynamic Mechanical Properties of Q460D Steel

Huang,

Lin,

et al. 2023

Metals

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The dynamic mechanical properties of Q460D steel were studied to facilitate an assessment of the impact resistance of building structures. In the present work, material performance tests of Q460D steel at different temperatures, strain rates, and stress states were conducted. Using a hybrid experimental–numerical approach, a modified Johnson–Cook (JC) constitutive relation, a modified Johnson–Cook (JC) fracture criterion, and a lode-dependent fracture criterion were calibrated. To validate the calibration, Taylor impact tests of Q460D steel rods onto rigid target plates were carried out in a one-stage light-gas gun system. Mushrooming, tensile splitting, and petalling failure modes were obtained as the impact velocity was increased from 191.6 to 422.1 m/s. A three-dimensional finite element model was built for the Taylor impact tests, and FE simulations were run using the material models calibrated. It was found that the FE simulations using the lode-dependent fracture criterion were reasonable in terms of the failure modes of the Taylor rods. In contrast, the fracture behavior of the Taylor rods was significantly underestimated using the lode-independent JC fracture criterion. Finally, the effect of anisotropy, strain rate sensitivity and yield plateau on the Taylor impact FE predictions were explored and discussed.

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Section: Introductionmentioning

confidence: 99%

A Study of the Dynamic Mechanical Properties of Q460D Steel

Huang,

Lin,

et al. 2023

Metals

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Optimization of Johnson–Cook Constitutive Model Parameters Using the Nesterov Gradient-Descent Method

2023

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Numerical simulation of impact and shock-wave interactions of deformable solids is an urgent problem. The key to the adequacy and accuracy of simulation is the material model that links the yield strength with accumulated plastic strain, strain rate, and temperature. A material model often used in engineering applications is the empirical Johnson–Cook (JC) model. However, an increase in the impact velocity complicates the choice of the model constants to reach agreement between numerical and experimental data. This paper presents a method for the selection of the JC model constants using an optimization algorithm based on the Nesterov gradient-descent method. A solution quality function is proposed to estimate the deviation of calculations from experimental data and to determine the optimum JC model parameters. Numerical calculations of the Taylor rod-on-anvil impact test were performed for cylindrical copper specimens. The numerical simulation performed with the optimized JC model parameters was in good agreement with the experimental data received by the authors of this paper and with the literature data. The accuracy of simulation depends on the experimental data used. For all considered experiments, the calculation accuracy (solution quality) increased by 10%. This method, developed for selecting optimized material model constants, may be useful for other models, regardless of the numerical code used for high-velocity impact simulations.

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Spatial Constitutive Modeling of AA7050-T7451 with Anisotropic Stress Transformation

Cited by 2 publications

References 44 publications

A Study of the Dynamic Mechanical Properties of Q460D Steel

A Study of the Dynamic Mechanical Properties of Q460D Steel

Optimization of Johnson–Cook Constitutive Model Parameters Using the Nesterov Gradient-Descent Method

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