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Acta Mechanica Solida Sinica

, Volume 30, Issue 5, pp 493–506 | Cite as

Influences of initial porosity, stress triaxiality and Lode parameter on plastic deformation and ductile fracture

  • Ying-Song Ma
  • Dong-Zhi Sun
  • Florence Andrieux
  • Ke-Shi Zhang
Article
  • 3 Downloads

Abstract

Local mechanical properties in aluminum cast components are inhomogeneous as a consequence of spatial distribution of microstructure, e.g., porosity, inclusions, grain size and arm spacing of secondary dendrites. In this work, the effect of porosity is investigated. Cast components contain voids with different sizes, forms, orientations and distributions. This is approximated by a porosity distribution in the following. The aim of this paper is to investigate the influence of initial porosity, stress triaxiality and Lode parameter on plastic deformation and ductile fracture. A micromechanical model with a spherical void located at the center of the matrix material, called the representative volume element (RVE), is developed. Fully periodic boundary conditions are applied to the RVE and the values of stress triaxiality and Lode parameter are kept constant during the entire course of loading. For this purpose, a multi-point constraint (MPC) user subroutine is developed to prescribe the loading. The results of the RVE model are used to establish the constitutive equations and to further investigate the influences of initial porosity, stress triaxiality and Lode parameter on elastic constant, plastic deformation and ductile fracture of an aluminum die casting alloy.

Keywords

Stress triaxiality Lode parameter Void Ductile fracture RVE 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2017

Authors and Affiliations

  1. 1.College of Civil Engineering and ArchitectureGuangxi University, Key Lab of Disaster Prevention and Structural Safety, Guangxi Key Lab Disaster Prevention and Engineering SafetyNanningChina
  2. 2.Department of Mining EngineeringShanxi Datong UniversityDatongChina
  3. 3.Fraunhofer Institute for Mechanics of Materials IWMFreiburgGermany

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