【摘要】 为了研究Ti Ni形状记忆合金的力学性能,利用MTS万能材料试验机测试得到了它在不同温度下的静态拉伸应力-应变曲线,并对曲线进行了详细的分析;利用分离式霍普金森压杆(简称SHPB)对Ti Ni合金进行了多种高应变率下的动态压缩实验,得到了相应的动态应力-应变曲线;利用改进的SHPB测试系统对Ti Ni合金进行了动态三点弯曲实验,得到了它的动态起裂韧度。结果表明,Ti Ni合金不同于一般的金属,它的静、动态应力-应变曲线出现了2个屈服平台、2个弹性阶段和2个非弹性变形阶段,同时,Ti Ni合金是一种比较脆的金属,在动态冲击载荷下容易发生脆断。更多还原

【Abstract】 In order to study the mechanical properties of Ti Ni shape memory alloy,static tensile stress-strain curves of Ti Ni alloy at different temperatures has been obtained by MTS universal testing machine,and the cueves were analyzed.The split Hopkinson pressure bar(SHPB) has been used to get the corresponding stress-strain curves of Ti Ni alloy under a variety of high strain rates.The improved SHPB system was used to get the dynamic fracture toughness of Ti Ni alloy by dynamic three-poin bending tests.The results show that the deformation behavior of Ti Ni alloy is different from that of the general metals.There are two yield platforms,two elastic stages and two non-elastic deformation stages on both static and dynamic stress-strain curves of Ti Ni alloy.Meanwhile,Ti Ni alloy is a relatively brittle metal and brritle fracture occurs more easily under dynamic impact loading.更多还原