摘要
诸多文献已经报道了β和(α+β)钛合金冲击和爆炸加载下的绝热剪切现象,本文利用分离式的Hopkinson压杆和反射式Hopkinson拉杆对α-钛合金TA6的动态力学性能进行研究,得到不同应变率下材料的应力-应变曲线,发现钛合金TA6和其他钛合金一样也是一种应变率敏感材料。冲击拉伸加载时破坏形状45度剪切断口,然而其在冲击压缩应力作用下体现为典型的韧性,并未出现其它类型钛合金通常会出现的绝热剪切破坏。进一步分析表明:α-钛合金TA6不同于β和(α+β)的钛合金,α-钛合金TA6相对于β和(α+β)的钛合金是一种绝热剪切不敏感的材料。同时也利用应力状态的柔韧系数的概念对拉伸时45度的剪切断口解释。
The phenomena of adiabatic shear about β phase and （α＋β） phase titanium alloy loaded by impact or explosive loads has been reported in many papers. The dynamic mechanics performances on TA6 of a phase titanium alloy were investigated by the split Hopkinson pressure bar and the split Hopkinson tensile bar of reflective type. The stress-strain curves of the material under different strain rates indicate that a phase titanium alloy TA6 is a kind of strain rate sensitive materials as other titanium alloys. The fracture of tensile loaded specimen is 45-degree shear fracture. But the impact compressive loaded TA6 has typical ductility and has not adiabatic shear failure phenomena which other titanium always do when they are loaded by impact load. Further analysis shows that a phase titanium alloy TA6 is different from β phase and （α＋β） phase titanium alloy because a phase alloy TA6 is less sensitive to adiabatic shear than β and （α＋β） phase titanium alloy . The mechanism that 45-degree shear fracture of tensile loaded specimen is explained through ductility coefficient of stress state.
出处
《实验力学》
CSCD
北大核心
2005年第4期567-572,共6页
Journal of Experimental Mechanics
作者简介
张磊（1974-），男，中国科学技术大学力学和机械工程系博士研究生，主要从事冲击动力学研究。
