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Continuum damage mechanics for sintered powder metals

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  • Solid Mechanics
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Abstract

Sintered metals are characterized by the high porosity (⩾ 8%) and voids/micro-cracks in microns. Inelastic behavior of the materials is coupled with micro-crack propagation and coalescence of open voids. In the present work the damage evolution of the sintered iron under multi-axial monotonic loading conditions was investigated experimentally and computationally. The tests indicated that damage of the sintered iron initiated already at a stress level much lower than the macroscopic yield stress. The damage process can be divided into the stress-dominated elastic damage and the plastic damage described by the plastic strain. Based on the uniaxial tensile tests an elastic-plastic continuum damage model was developed which predicts both elastic damage and plastic damage in the sintered iron under general multi-axial monotonic loading conditions. Computational predictions agree with experiments with different multi-axial loading paths. A phenomenological continuum damage model for the sintered metal is developed based on the experimental observations to predict the inelastic behavior and damage process to failure under multi-axial loading conditions. The proposed damage model is experimentally verified under different loading conditions.

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Authors and Affiliations

  1. Beijing Institute of Technology, School of Mechanical Engineering, Beijing, 100081, China

    Huang Yuan & Long Zhang

  2. Department of Mechanical Engineering, University of Wuppertal, Wuppertal, Germany

    Huang Yuan & SongYun Ma

Authors
  1. Huang Yuan
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  2. SongYun Ma
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  3. Long Zhang
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Correspondence to Huang Yuan.

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Yuan, H., Ma, S. & Zhang, L. Continuum damage mechanics for sintered powder metals. Sci. China Phys. Mech. Astron. 58, 1–12 (2015). https://doi.org/10.1007/s11433-014-5529-7

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  • DOI: https://doi.org/10.1007/s11433-014-5529-7

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