Structural Engineering and Mechanics

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Failure analysis of laminates by implementation of continuum damage mechanics in layer-wise finite element theory

  • Mohammadi, B. (School of Mechanical Engineering, Iran University of Science and Technology) ;
  • Hosseini-Toudeshky, H. (Aerospace Engineering Department & Center of Excellence in Computational Aerospace Engineering, Amirkabir University of Technology) ;
  • Sadr-Lahidjani, M.H. (Aerospace Engineering Department, Amirkabir University of Technology)
  • Received : 2007.11.22
  • Accepted : 2009.09.25
  • Published : 2009.12.20
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Abstract

In this paper a 3-D continuum damage mechanics formulation for composite laminates and its implementation into a finite element model that is based on the layer-wise laminate plate theory are described. In the damage formulation, each composite ply is treated as a homogeneous orthotropic material exhibiting orthotropic damage in the form of distributed microscopic cracks that are normal to the three principal material directions. The progressive damage of different angle ply composite laminates under quasi-static loading that exhibit the free edge effects are investigated. The effects of various numerical modeling parameters on the progressive damage response are investigated. It will be shown that the dominant damage mechanism in the lay-ups of [+30/-30]s and [+45/-45]s is matrix cracking. However, the lay-up of [+15/-15] may be delaminated in the vicinity of the edges and at $+{\theta}/-{\theta}$ layers interfaces.

Keywords

References

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