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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 6    June 2017

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An elasto-visco-plastic constitutive model of polypropylene incorporating craze damage behavior and its validation
GUI Zhong-xiang(桂中祥)1, 2, HU Xiao(胡肖)2, WANG Zi-jian(王子健)2

1. The 38th Research Institute of China Electronics Technology Group Corporation, Hefei 230088, China;
2. State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:An elasto-visco-plastic constitutive model incorporating the craze damage behavior was developed for the polypropylene (PP), by using the plastic failure model applied for the concrete, to capture the craze yielding and stress-whitening phenomena. In addition, the developed constitutive model was implemented into finite element codes in Abaqus to simulate the tensile deformation. The standard uniaxial tensile tests were carried out. The stress-strain curves from the uniaxial tensile tests show that the stress keeps decreasing after yielding and the yield stress rises with the increasing of the strain rate. It is worth noting that the craze damage is more visible with higher strain rate. The stress-whitening can be seen clearly around the fracture. The uniaxial tensile tests using specially designed specimen with circular holes weakening were performed for the validation of the developed model. The simulation results of the tensile deformation of the hole-weakened specimen suggest that the stress-whitening could be attributed to the equivalent visco-plastic strain. By comparing between the simulation analysis and the experimental results, the proposed model can describe the stress whitening phenomenon with good accuracy.

 

Key words: elasto-visco-plastic constitutive model; craze yielding; stress-whitening; finite element implementation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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