上海交通大学学报

上海交通大学学报（自然版）

• 一般工业技术 • 上一篇    下一篇

热塑性聚烯烃大变形行为建模及数值模拟

马秋1，于爽2，苏旭明3，于忠奇1
  

  1. （1.上海交通大学　机械与动力工程学院， 上海　200240； 2.上海宇航系统工程研究所， 上海 201108；3.美国福特汽车研发中心， 迪尔博恩 48120）
  • 收稿日期:2009-08-07 修回日期:1900-01-01 出版日期:2010-08-31 发布日期:2010-08-31

Modeling and Numerical Simulation of the Large Deformation Behavior for Thermoplastic Olefin

MA Qiu1,YU Shuang2，SU Xuming3,YU Zhongqi1
  

  1. (1.School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2.Research Institute of Shanghai Aerospace System Engineering, Shanghai 201108,China; 3.Research Center of Ford Motor Company, Dearborn 48120, USA)
  • Received:2009-08-07 Revised:1900-01-01 Online:2010-08-31 Published:2010-08-31

摘要： 为了研究热塑性聚烯烃(TPO)大变形过程中力学行为，将基于高分子材料微观特征建立的本构模型加入有限元软件中，实现了TPO变形和微观特征演变的耦合.该模型考虑了TPO材料与应变速率有关的初始均匀变形、屈服、应变软化和应变硬化的变形过程.采用数值模拟的方法，研究了TPO在拉伸状态下的力学行为.结果表明，本构模型的预测结果与试验结果比较接近，模拟结果清晰地描述了三维变形过程中应力场的分布以及颈缩演变，为TPO材料零件的虚拟设计提供了依据.

关键词: 热塑性聚烯烃, 本构模型, 变形行为, 数值模拟

Abstract: In order to study the deformation behavior of a thermoplastic olefin (TPO) during tensile loading, a constitutive model based on molecular chain evolution was developed and was implemented into a finite element method (FEM). Then the deformation behavior and microstructure were coupled. The model includes rate dependent initial uniform deformation, yielding, strain softening, and strain hardening. The FEM was used to simulate the deformation behavior of TPO during tensile test. The results show that the constitutive model results are very close to the experimental data. The simulation results give a clear description of stress distribution and evolution of necking during threedimensional deformation. The FEM results provide fruitful information for virtual design of TPO parts under development.

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