【摘要】 利用LS-DYNA程序的用户自定义模型功能,在LS-DYNA程序中嵌入了用于描述混凝土及钢筋混凝土侵彻贯穿的动态损伤模型。模型拉伸部分用Taylor-Chen-Kuszmaul(TCK)模型描述,体现了应变率对拉伸作用的敏感性;压缩部分则采用Holmquist-Johnson-Cook(HJC)强度模型。模型中考虑了拉伸损伤、压缩损伤、应变软化、静水压力效应以及应变率效应。利用该方法对弹体攻角非正侵彻混凝土靶过程中的弹体变形、混凝土靶的损伤破坏、弹体的速度变化规律及弹体的变形进行了计算,并将计算结果与实验结果进行了比较,结果表明,采用该模型可以较好地模拟弹体非正侵彻混凝土过程。更多还原

【Abstract】 The modified dynamic damage model for modeling penetration into concrete or reinforced concrete was implemented into the three-dimensional transient dynamic explicit finite element code LS-DYNA with the user-defined material function. The model includes two parts: tension part described by TCK model indicating the strain rate sensitivity to tension process and the compression part described by HJC model. This model considers tension damage, compressive damage, strain softening, hydrostatic pressure and strain rate effects. By using the propsoed method, simulation on yawed penetration was carried out and compared with the experimental results. In simulation of penetration process the deformation and the velocity variation of the projectile and damage of the target were analyzed. Calculated results show that the model can predict the process of the yawed penetration into concrete well with the test data.更多还原