升温与加载顺序对NiTi纤维圆柱体应力分布的影响

利用具有预应变NiTi纤维的圆柱体剪滞模型,在一定的简化条件下,求得纤维轴向应力及界面剪应力解析表达式.针对马氏体逆相变过程,在先加外载后升高温度与先升高温度后加外载两种条件下,对纤维和界面的应力分布以及马氏体逆相变开始温度的确定进行分析.计算结果表明,由于纤维轴向应力对相变温度存在影响,升温与加载的顺序不同其应力分布也不同.先加外载后升温时,NiTi纤维逆相变开始温度较高,逆相变过程较短,因此纤维轴向应力及界面剪应力较小.

Effect of Different Ways of Heating and Loading on Stress Distribution of Cylinder Model with Prestrained NiTi Fiber

A typical cylinder model with a prestrained NiTi fiber was employed to analyse the stress transfer.During the reverse transformation and under the simplified conditions,the stress formulae of the NiTi fiber and the interface were obtained.Additionally,the effective austenite start temperature of the NiTi fiber was determined according to its axial stress.It is shown that there are different stress distributions for different ways of heating and loading,due to the effect of NiTi fiber axial stress on the eff...