基于HJC模型高温后大理岩SHPB实验数值模拟研究

为对高温后大理岩动态压缩实验结果进行验证并探索数值模拟方法,采用"参考-计算-试算-调整"的方法基于HJC本构模型对不同温度等级高温处理后大理岩材料模型参数进行确定,利用ANSYS/LS-DYNA数值模拟软件对高温处理后大理岩SHPB实验进行数值模拟,并将数值模拟结果与室内实验结果进行对比分析.结果表明,数值模拟结果与...

Numerical simulation of marble damaged by high temperature in SHPB experiment based on HJC model

In order to verify the dynamic compression test results of marble after high temperature and explore the numerical simulation method, the method of "reference-calculation-trialcalculation-adjustment" is used to determine the material model parameters of marble after high temperature of different temperature grades. The SHPB test of marble after high temperature is simulated by ANSYS/LS-DYNA numerical simulation software, and the numerical simulation results are compared with the indoor test results. The results show as follow. The numerical simulation results are consistent with the indoor test results. In the process of SHPB test, marble cracks show the trend of development from edge to center, which results from splitting and tensile failure to further failure, and this phenomenon is often neglected because of shorter observation interval. The HJC constitutive model can effectively characterize the physical and mechanical properties of marble specimens. By modifying some of the model parameters, the physical and mechanical parameters of marble samples after different high temperature grades can be effectively described. The effect of temperature damage on the dynamic failure mode of marble specimen is reflected in the fine particle size, and with the increase of treatment temperature, the fine grains of marble also increase after breaking.