功能梯度形状记忆合金圆筒受扭的力学行为分析

Mechanical Behavior of Functionally Graded Shape Memory Alloy Cylinder Under Torque Load

为能简单准确地预测功能梯度形状记忆合金(functionallygradedshapememoryalloy,FG-SMA)在载荷作用下的力学行为,应用有限元软件ANSYS14.0对FG-SMA圆筒在扭矩载荷作用下的受力变形行为进行研究,提出一个适合于模拟FG-SMA力学行为的有限元建模、计算方法,得到FG-SMA圆筒在扭矩作用下的受力变形特点.数值算例显示:FG-SMA圆筒的截面最大应力显著减小,可避免材料由于应力过大而导致的破坏.此外,载荷大小、分布函数和筒壁厚度对FG-SMA圆筒截面上的应力和应变分布有着很大的影响.

In order to predict the mechanical behaviour of functionally graded shape memory alloy(FG-SMA)simply and precisely,the mechanical behavior of a FG-SMA cylinder subjected to torque load was investigated by using the finite element analysis software ANSYS 14.0.A new method for creating a finite element model of FG-SMA was proposed,and the model created this way can simulate the mechanical behavior of FG-SMA very well.The calculating results show that the maximum stress on the cross section of the FG-SMA cylinder decreased significantly,and the destruction caused by too much stress can thus be prevented.At the same time,the distribution of the stress and strain on the cross section of the FG-SMA cylinder was affected greatly by the torque value,the distribution of the volume fraction of SMA,and the thickness of the cylinder wall.