Several Influential Factors on Numerical Simulated Results for the X-Ray Thermal Shock Waves
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摘要: 是否考虑康普顿散射光子的输运，用何种材料模型描述熔化、汽化和应变率效应，选用怎样的迎光自由面差分格式以及空间步长大小等因素，对X光热激波数值模拟结果都会产生重要的影响。依据热激波一维数值模拟结果，对上述各种因素的影响进行了定量分析。计算表明：在X光能谱比较软和辐照量较大时，物态方程、迎光自由面差分格式和空间步长大小对热激波的计算结果都会造成重要影响；在X光能增变硬时，康普顿散射的影响增大；在低压时，本构关系和屈服强度基本上控制了热激波的衰减规律。Abstract: Taking account of Compton scattering photons transport behavior or not, using what model to describe melting, vaporization and strain rate effect, how to determine free surface difference schemes, mesh size and time step, all of these factors will generate important effect on numerical simulated result for X-ray shock waves. According to the data calculated by thermal shock wave propagation code, the effect of several factors above mentioned are analyzed in this paper. Our results indicate that, for soft spectrum and large fluency of X-ray source, the equations of state, free surface difference schemes, mesh size and time step will influence significantly on calculated results. When X-ray energy spectrum turns to strong, the Compton scattering can cause more influence. At low stress, the constitutive equations and yield strength will control thermal shock wave attenuation along the material thickness basically.
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Key words:
- thermal shock waves /
- numerical simulation /
- X-ray
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