高速变形材料塑性及JC和MSV断裂准则的表达能力
发布时间：2018-11-14 16:11
【摘要】：研究了超高变形速率下材料的塑性(延性)演化规律和断裂行为。通过45钢、Ti-6Al-4V、Al2024-T3和Al2024-T351四种材料高速变形数据,考察了JC断裂准则和MSV断裂准则对于高应变率下材料失效行为的表达能力。研究发现,JC断裂准则中材料的失效应变随着应变率的增加单调增大,JC断裂准则能够描述中低应变率范围内(0-10~3/s)材料的断裂情况;对于应变率更高(≥10~4/s)情况下材料的断裂行为,JC断裂准则不能描述。材料的MSV在约10~4/s时突然增大,MSV断裂准则能够描述超高应变率下材料的断裂趋势。
[Abstract]:The plastic (ductility) evolution and fracture behavior of materials at ultra-high deformation rates are studied. Based on the high-speed deformation data of 45 steel, Ti-6Al-4V,Al2024-T3 and Al2024-T351, the expression of JC fracture criterion and MSV fracture criterion on the failure behavior of materials at high strain rate was investigated. It is found that the failure strain of the material in the JC fracture criterion increases monotonously with the increase of the strain rate, and the JC fracture criterion can describe the fracture of the material in the range of low and low strain rates (0-10 / 3 / s). The JC fracture criterion cannot describe the fracture behavior of the material at higher strain rate (鈮，
本文编号：2331658
[Abstract]:The plastic (ductility) evolution and fracture behavior of materials at ultra-high deformation rates are studied. Based on the high-speed deformation data of 45 steel, Ti-6Al-4V,Al2024-T3 and Al2024-T351, the expression of JC fracture criterion and MSV fracture criterion on the failure behavior of materials at high strain rate was investigated. It is found that the failure strain of the material in the JC fracture criterion increases monotonously with the increase of the strain rate, and the JC fracture criterion can describe the fracture of the material in the range of low and low strain rates (0-10 / 3 / s). The JC fracture criterion cannot describe the fracture behavior of the material at higher strain rate (鈮，
本文编号：2331658
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