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为了提高SCG模型在冲击高温高压以及静高压等加载条件下的适应性,提出了一个修正的模型。根据第一性原理的计算结果,提出用一种幂函数的形式计算0 K等温状态下材料的剪切模量。考虑了压力、温度对材料剪切模量的交互作用。提出了一个包含压力作用完整项和温度、压力一阶交互作用项的修正模型。模型的相关参数由静高压、高温数据确定。修正模型在冲击高温高压状态下得到了Al、Cu两种材料实验数据的验证。与原始的SCG模型比较,修正的模型在不同材料、不同加载条件下表现了更好的精度和普适性。
In order to improve the adaptability of SCG model under the conditions of high temperature and high pressure and high static pressure, a modified model is proposed. According to the calculation results of the first principle, it is proposed to calculate the shear modulus of a material under the isothermal condition of 0 K by using a power function. Consider the interaction of pressure and temperature on the shear modulus of materials. A modified model is proposed that includes the complete term of pressure action and the first-order interaction term of temperature and pressure. The parameters of the model are determined by static high pressure and high temperature data. The modified model was verified by experimental data of both Al and Cu materials under the impact of high temperature and high pressure. Compared with the original SCG model, the modified model shows better accuracy and universality under different materials and different loading conditions.