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摘要: 分别利用Johnson-Cook（JC）本构模型和Steinberg-Cochran-Guinan（SCG）本构模型对无氧铜在10~20 GPa冲击压力下的卸载过程进行了数值模拟，与冲击-卸载实验结果比较表明，在这样的冲击压力下无氧铜的应变率效应仍然明显，JC模型对无氧铜的动态卸载行为有较好的描述。Abstract: The dynamic release behavior of OFHC copper under 10~20 GPa shock pressure was simulated by using the Johnson-Cook (JC) constitutive model and Steinberg-Cochran-Guinan (SCG) constitutive model, respectively. Comparisons between the simulations and the experimental results show that the strain rate effect during the release process of copper under such shock pressure ranges is still obvious. And the simulation of JC model gives better agreement with experimental results than the simulation of SCG model in which the strain rate effect is ignored.
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Key words:
- mechanics of explosion /
- numerical simulation /
- OFHC copper /
- JC model /
- SCG model
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Johnson G R, Cook W H. A Constitutive Model and Data for Metals Subjected to Large Strain, High Strain Rates and High Temperatures [A]. Proc 7th Int Symp Ballistics [C]. The Hague: the Netherlands, 1983. Steinberg D J, Cochran S G, Guinan M W. A Constitutive Model for Metals Applicable at High Strain Rate [J]. J Appl Phys, 1980, 51(3): 1498-1503. Song P. Study on High Pressure Release of OFHC Copper [D]. Mianyang: Graduate School of China Academy of Engineer Physics, 2003. (in Chinese) 宋萍. 无氧铜高压卸载研究 [D]. 绵阳: 中国工程物理研究院, 2003. Ma Y, Hu S L, Wang X S, et al. VISAR Measurement on Interface Velocity between Shocked Specimen and Window [J]. Chinese Journal of High Pressure Physics, 2003, 17(4): 290-294. (in Chinese) 马云, 胡绍楼, 汪小松, 等. 样品-窗口界面运动速度的VISAR测试技术 [J]. 高压物理学报, 2003, 17(4): 290-294. Marsh S P. LASL Shock Hugoniot Data [Z]. California: University of California, 1980. -
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