混凝土动态损伤与失效模型

Dynamic Damage and Failure Model for Concrete Materials

在TCK模型的基础上开发了一个用于混凝土或钢筋混凝土碰撞或侵彻的损伤模型。模型分成两部分考虑:拉伸损伤用TCK模型描述,剪切部分则采用RHT模型。模型考虑了应变硬化、压力和J3相关的失效面、软化、拉伸损伤、压缩损伤和应变率效应。利用LS-DYNA程序的用户自定义材料模型开发并实现了模型算法,并用有关混凝土侵彻试验结果对模型参数进行了标定。计算结果表明,采用该模型可以较好地模拟混凝土或钢筋混凝土的碰撞或侵彻过程中开坑、穿孔和弹体穿孔后的孔壁剥离现象,对剩余速度的预测较为准确。

A new dynamic damage and failure model for modeling penetration into concrete or reinforced concrete materials is presented based on TCK damage model. The model includes two parts： tensile damage described by TCK model and shear failure by RHT model. Nonlinear strain hardening, pressure and J3 dependent failure surface, strain softening, tensile and compressive damage and strain rate effects are accounted in the model. The model is implemented through a user defined material model in LS-DYNA. The model parameters are calibrated and validated by the data from related concrete penetration tests. The calculated result shows that the model can predict craters, perforation and post perforation scabbing from the inner face of tunnel and back face of target during penetration into concrete or reinforced concrete materials. The calculated residual velocity of the penetrator agrees well with the test data.