四川轻化工大学学报（自然科学版）2025，Vol.38Issue(1)：30-38,9.DOI:10.11863/j.suse.2025.01.04
形状记忆合金管接头装配过程的有限元模拟
Finite Element Simulation of the Assembly Process of Shape Memory Alloy Pipe Joints
摘要
Abstract
Two inelastic deformation mechanisms,namely martensitic transformation and martensitic plasticity,are introduced to construct a macroscopic thermo-mechanical coupled constitutive model for shape memory alloys.Using the secondary development functionality of the finite element analysis software ABAQUS,a user material subroutine(UMAT)is developed to perform numerical simulations of the assembly process for the pipe joint system.To investigate the effect of assembly at different temperatures,expansion diameters and wall thickness sizes on the service performance of pipe joints,the stress distribution of the pipe joint system is analysed by considering the force of the connected parts and the plastic strain.Additionally,the influence factors of the drawing force are analysed through the simulation of the drawing process of the pipe joint.The results show that the wall thickness of the fitting affects the distribution of stress in all directions.The inner surface maximum contact pressure difference of a fitting with a wall thickness of 5 mm reaches 32.3 MPa.Thicker fittings produce greater contact pressure,with the maximum contact pressure produced by a fitting with a wall thickness of 5 mm increasing by 62.9 MPa compared to that of a fitting with a wall thickness of 3 mm,Additionally,dilatation and the assembly temperature have a significant effect on the magnitude of the pull-out force.The plastic deformation of the connected parts varies with different sizes of pipe joints.The above research provides theoretical basis and technical guidance for the production design of shape memory alloy pipe joint system.关键词
形状记忆合金/管接头/拉拔力/热-力耦合本构模型/塑性应变Key words
shape memory alloy/pipe joint/pull-out force/thermo-mechanical coupled constitutive model/plastic strain分类
通用工业技术引用本文复制引用
杨航,于超..形状记忆合金管接头装配过程的有限元模拟[J].四川轻化工大学学报（自然科学版）,2025,38(1):30-38,9.基金项目
国家自然科学基金项目(12322203 （）
12072296) （）
