基于HJC模型高温后大理岩SHPB实验数值模拟研究

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

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,数值模拟结果与室内实验结果具有一致性;大理岩试件破坏呈现裂隙由边缘向中心发展的趋势,表现为先以劈裂拉伸破坏产生裂隙进而进一步完全破坏,这种现象在实验过程中往往因观察区间较短容易被忽视;HJC本构模型可以有效地表征大理岩试件各项物理力学性质;通过对部分模型参数修改可以有效地对不同等级高温处理后大理岩试件物理力学参数描述;温度的损伤效应对于大理岩试件动态冲击破坏形态的影响体现在破碎后细粒量,随着处理温度的升高,大理岩破碎后细粒也不断增多。

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.