有限元分析
潘新祥2， 朱新河2，劉一梅2
(1．大連海事大學(xué) 材料工藝研究所，大連 116026；
2．大連海事大學(xué) 輪機(jī)工程學(xué)院， 大連 116026)
摘 要: 采用多線性彈性和雙線性等向強(qiáng)化兩種材料模型， 對在法向力載荷作用下的TiNi形狀記憶合金進(jìn)行有限元模擬。結(jié)果表明：多線性彈性模型不適合用來分析TiNi合金的超彈性； 而通過用最大彈性變形量（與屈服極限對應(yīng)的極限應(yīng)變值）來模擬TiNi合金的超彈性， 采用雙線性等向強(qiáng)化模型可以描述TiNi合金的超彈性與產(chǎn)生的最大Von Mises彈性應(yīng)變及最大Von Mises塑性應(yīng)變之間的關(guān)系， 能夠?yàn)橐訲iNi合金作為機(jī)敏材料、 耐磨材料及耐磨膜層材料設(shè)計(jì)提供依據(jù)。 最后， 在該材料模型下， 將用有限元方法與用納米力學(xué)探針得到的位移與載荷關(guān)系曲線進(jìn)行對比，兩者相差不大。
關(guān)鍵字: 材料模型; TiNi形狀記憶合金; 超彈性; 有限元; 機(jī)敏材料; 耐磨材料
PAN Xin-xiang2, ZHU Xin-he2, LIU Yi-mei2
（1. Institute of Material and Technology,
Dalian Maritime University,Dalian 116026, China;
2. Marine Engineering College,
Dalian Maritime University,Dalian 116026, China）
Abstract:Two different material models(mutilinear elastic model and bilinear isotropic hardening model) were used to carry out the finite element analysis of TiNi shape memory alloy with pseudoelasticity feature under normal force load. The results show that the mutilinear elastic model is not appropriate for analyzing the pseudoelasticity of TiNi alloy, but through using the maximum elastic deformation (the strain value at the yield point) to simulate the pseudoelasticity of TiNi shape memory alloy, the bilinear isotropic hardening model can describe the relationships between the pseudoelasticity of TiNi shape memory alloys and strains including elastic strain and plastic strain. The results gotten from this analysis using the bilinear isotropic hardening model can be used to provide the reference for designing TiNi alloy as smart material and anti-wear material. Finally, under the bilinear isotropic hardening model, the relationship between load and displacement gotten from FEM was compared with that derived from nanoindenter, results indicate that they are at close range.
Key words: material model; TiNi shape memory alloys; pseudoelasticity; finite element; smart material; anti-wear material
