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本文利用多尺度方法研究了包含孔洞金属材料在冲击加载条件下的动力学行为.该多尺度方法结合了分子动力学和有限元方法,分子动力学方法运用于局部缺陷区域,而有限元方法运用于整个模型区域,两种方法之间使用桥尺度函数进行连接.计算结果既包括了系统宏观的物理信息,如应变场、应力场、温度场等,也得到了微观原子的物理信息,如原子能量和位置坐标等.结合以上的模拟结果,发现孔洞的坍塌与材料屈服强度和冲击强度有关,而孔洞坍塌和坍塌过程中对微喷射原子的压缩过程是形成局部热点的主要原因.同时也发现孔洞坍塌形成的位错和局部热点可以导致局部绝热剪切带更容易形成.
In this paper, the multi-scale method is used to study the dynamic behavior of metallic materials containing holes under shock loading conditions. The multi-scale method combines molecular dynamics and finite element method, molecular dynamics method applied to the local defect area, and the finite element method Throughout the model area, bridge-scale functions are used to connect the two methods.The calculation results include both the macro-physical information of the system, such as strain field, stress field, temperature field, etc., as well as the physical information of micro-atoms such as atomic energy Quantity and position coordinates, etc. Combining the above simulation results, it is found that the collapse of the hole is related to the yield strength and impact strength of the material, while the compression process of the micro-jet atom during the collapse and collapse of the hole is the main reason for forming a local hot spot. Dislocations and local hot spots formed by collapse of the holes can result in easier formation of the local adiabatic shear band.