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Simulation of ductile fracture initiation in steels using a stress triaxiality–shear stress coupled model

  • Yazhi Zhu
  • Michael D. Engelhardt
  • Zuanfeng PanEmail author
Research Paper
  • 32 Downloads

Abstract

Micromechanics-based models provide powerful tools to predict initiation of ductile fracture in steels. A new criterion is presented herein to study the process of ductile fracture when the effects of both stress triaxiality and shear stress on void growth and coalescence are considered. Finite-element analyses of two different kinds of steel, viz. ASTM A992 and AISI 1045, were carried out to monitor the history of stress and strain states and study the methodology for determining fracture initiation. Both the new model and void growth model (VGM) were calibrated for both kinds of steel and their accuracy for predicting fracture initiation evaluated. The results indicated that both models offer good accuracy for predicting fracture of A992 steel. However, use of the VGM leads to a significant deviation for 1045 steel, while the new model presents good performance for predicting fracture over a wide range of stress triaxiality while capturing the effect of shear stress on fracture initiation.

Keywords

Ductile fracture Void growth Stress triaxiality Shear stress ratio ASTM A992 steel AISI 1045 steel 

Notes

Acknowledgements

Y.Z. Zhu and M.D. Engelhardt thank the funding support of the National Science Foundation (Grant 1344592). Z.F. Pan gratefully acknowledges the support of the National Natural Science Foundation of China (Grant 51778462) and the National Key Research and Development Plan (Grants 2017YFC1500700 and 2016YFC0701400).

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yazhi Zhu
    • 1
  • Michael D. Engelhardt
    • 2
  • Zuanfeng Pan
    • 1
    Email author
  1. 1.Department of Structural EngineeringTongji UniversityShanghaiChina
  2. 2.Ferguson Structural Engineering Laboratory, Department of Civil, Architectural and Environmental EngineeringUniversity of Texas at AustinAustinUSA

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