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摘要: 在SCG模型基础上对其温度软化效应项作了改进，所提出的新模型在熔点温度Tm处满足剪切模量G(Tm)=0，从而提高了温度的适用范围。对Al和93W作了计算，其理论结果与实验符合相当好。Abstract: D.J.Steinberg, S.G.Cochran, and M.W.Guinan (SCG) presented a constitutive model for metals applicable at high strain rate in 1980. A new expression for the temperature related term in SCG model was suggested in this work. The expression gives that their moduli vanish at melting temperature, i.e., G(Tm)=0. Therefore, SCG model with the suggested expression can be used to describe material properties under high temperature. We have carried out calculations for Al and 93W, the theoretical results are in agreement with that of experiments very well.
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Key words:
- constitutive relation /
- SCG model /
- shock melting /
- shear modulus /
- yield strength
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Johnson G R, Cook W H. Proc 7th Intern Symp Ballistics [C]. Am Def Prep Org, 1983. Johnson G R, Hoegfeldt J M, Lindholm U S, et al. J ASME Eng Matter Tech, 1983, 105: 42. 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. 华劲松. 高温高压下钨合金的本构方程研究 [D]. 绵阳: 中国工程物理研究院研究生部, 1999. 李茂生, 陈栋泉. 髙压熔化曲线的实验标定 [J]. 髙压物理学报, 2000, 14(3): 166. 胡金彪, 经福谦, 程菊鑫. 铜的高压声速和冲击熔化[J]. 髙压物理学报, 1989, 3(3): 187. Meyers M A. Shock-Induced Melting, Solidification and Vaporization [A]. Dynamic Behavior of Materials [C]. New York: John Wiley Inc, 1994. 218. 王春奎. LF-6及LY-12铝高温凝聚态动力学性质研究髙温剪切模量的测定 [J]. 髙压物理学报, 1994, 8(3): 213. -
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