TiNiCuNb合金力学性能仿真分析

Simulation Analysis of Mechanical Properties of TiNiCuNb Alloys

本研究运用有限元分析软件对(Ti_(51)Ni_(36)Cu_(13))_(90)Nb_(10)合金进行了研究,并与已有实验进行对比以验证模拟的可靠性。研究表明,合金在力-热耦合作用时,低温卸载马氏体体积分数保持最大值不变,残余应变值最大,高温卸载时马氏体体积分数从最大值减小至消失;温度越高,合金由弹性过程向塑性变形过程转变的应力值也越大;进行局部循环加载-卸载循环应力大于屈服应力后,应力-应变加载路径与第一次相同,马氏体体积分数逐渐增加到最大值,卸载后可减小至消失;低温下增加应力至马氏体相变完成,高温时可产生形状记忆效应。

This study used finite element analysis software to study(Ti_(51)Ni_(36)Cu_(13))_(90)Nb_(10)alloys and compared it with existing experiments to verify the reliability of the simulation.Results show that when the alloy is used in force thermal coupling,the volume fraction of martensite under low temperatures unloading remains the maximum,and that the residual strain value is the maximum,the volume fraction of martensite under high temperatures unloading decreases from the maximum to disappear.The higher the temperature,the greater the stress is that the alloy undergoes from an elastic process to a plastic deformation process.During local cyclic loading-unloading,when the cyclic stress is greater than the yield stress,the stress-strain loading path is the same as that of the first time,and the volume fraction of martensite gradually increases to the maximum value,which can be reduced to disappear after unloading.Increasing stress at low temperatures until martensite transformation is completed,and shape memory effect can be produced at high temperatures.