TiNi形状记忆合金低速冲击性能的数值模拟  

Numerical Simulation on the Low-velocity Impact Behavior of TiNi Shape Memory Alloy

作　　者：唐光海[1] 张俊锋[2] 曾群锋[1] 董光能[1] 杨华斌 

机构地区：[1]西安交通大学现代设计及转子轴承系统教育部重点实验室,陕西西安710049 [2]中国船舶重工集团公司第七O四研究所,上海200031 [3]西安赛特金属开发有限公司,陕西西安710021

出　　处：《材料科学与工程学报》2014年第2期174-177,182,共5页Journal of Materials Science and Engineering

摘　　要：采用有限元法数值模拟了TiNi形状记忆合金(SMA)的低速冲击性能。考察马氏体相变过程中不同伪弹性模量和弹性应变极限对TiNi合金低速冲击性能的影响。结果表明,随着冲击速度的增加,4种材料的最大接触载荷和位移量都呈线性增加趋势;冲击速度相同时,3种不同伪弹性模量TiNi合金试样的最大接触载荷和位移量近似相等且都低于45#钢,TiNi合金试样产生的最大Von Mises应力和最大塑性应变都低于45#钢;超弹性模量为2.9GPa的TiNi合金产生的最大Von Mises应力和最大塑性应变均最低。TiNi形状记忆合金较低的超弹性模量和较大的弹性应变极限能够减小冲击过程中的最大Von Mises应力,抑制高塑性应变的产生并使塑性变形区域减小,从而提高TiNi合金的抗冲击性能。The low-velocity impact behavior of TiNi shape memory alloy(SMA)is investigated by finite element method.The effects of elastic strain limit and pseudo elastic modulus during martensite transformation process on the low velocity impact behavior of shape memory alloys were evaluated.The results indicate that the maximum contact force and displacement of four kinds of materials increase linearly with the increase of impact velocity.In addition,under constant impact velocity,the impact deformation displacement and maximum contact force for the three different pseudoelastic modulus of TiNi alloys are close,but all lower than 45#steel.Furthermore,when the pseudoelastic modulus is equal to 2.9GPa,the maximum Von Mises stress and maximum plastic strain of TiNi alloys become the lowest.During low velocity impact stage,the higher pseudoelastic strain and lower pseudoelastic modulus decreased the von Mises stress of pseudoelastic and suppressed the production of high plastic strain compared with 45#steel,which enhance the impact resistance of TiNi shape memory alloys.

关 键 词：形状记忆合金 低速冲击 数值模拟 塑性应变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]