内脊型TiNiFe记忆合金管接头拉脱力的三维有限元模拟
3D FINITE ELEMENT SIMULATION OF PULL–OUT FORCE OF TiNiFe SHAPE MEMORY PIPE COUPLING WITH INNER CONVEX
Received date: 2012-08-23
Revised date: 2012-10-11
Online published: 2012-12-11
张慧博 金伟 杨锐 . 内脊型TiNiFe记忆合金管接头拉脱力的三维有限元模拟[J]. 金属学报, 2012 , 48(12) : 1520 -1524 . DOI: 10.3724/SP.J.1037.2012.00493
Dimension design is a key aspect for shape memory pipe coupling, and determines the connecting strength of the connecting unit. Numerical simulation provides a theoretical basis for dimension design. In this paper, a three–dimensional constitutive model was developed to simulate the deformation and recovery process of TiNiFe shape memory pipe coupling. Finite element method is applied to simulate the stress distribution and pull–out force of the connecting units. Properties of TiNiFe alloy used in the simulation are measured from experiments. The influences of the inner convex and its height on the pull–out force are investigated. The simulated results reveal that the inner convex increases the pull–out force of the connecting units, which increases linearly with the height of the inner convex within the scope of simulations. The experimental results are in good agreement with the simulated pull–out forces with a deviation of less than 4%.
Key words： TiNiFe; shape memory; pipe coupling; constitutive equation; finite element
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