【摘要】：研究了超高變形速率下材料的塑性(延性)演化規(guī)律和斷裂行為。通過45鋼、Ti-6Al-4V、Al2024-T3和Al2024-T351四種材料高速變形數(shù)據(jù),考察了JC斷裂準(zhǔn)則和MSV斷裂準(zhǔn)則對(duì)于高應(yīng)變率下材料失效行為的表達(dá)能力。研究發(fā)現(xiàn),JC斷裂準(zhǔn)則中材料的失效應(yīng)變隨著應(yīng)變率的增加單調(diào)增大,JC斷裂準(zhǔn)則能夠描述中低應(yīng)變率范圍內(nèi)(0-10~3/s)材料的斷裂情況;對(duì)于應(yīng)變率更高(≥10~4/s)情況下材料的斷裂行為,JC斷裂準(zhǔn)則不能描述。材料的MSV在約10~4/s時(shí)突然增大,MSV斷裂準(zhǔn)則能夠描述超高應(yīng)變率下材料的斷裂趨勢(shì)。
[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，

本文編號(hào)：2331658