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Structural Engineering and Mechanics
  Volume 33, Number 6, December20 2009, pages 657-674

Failure analysis of laminates by implementation of continuum damage mechanics in layer-wise finite element theory
B. Mohammadi, H. Hosseini-Toudeshky and M.H. Sadr-Lahidjani

    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 +
Key Words
    continuum damage mechanic; angle ply laminate; layer-wise; FEM.
B. Mohammadi: School of Mechanical Engineering, Iran University of Science and Technology, University Road, Hengam Street, Resalat Square, Narmak, Tehran, Iran
H. Hosseini-Toudeshky: Aerospace Engineering Department & Center of Excellence in Computational Aerospace Engineering,
Amirkabir University of Technology, No. 424, Hafez Ave., Tehran, Iran
M.H. Sadr-Lahidjani: Aerospace Engineering Department, Amirkabir University of Technology, No. 424,
Hafez Ave., Tehran, Iran

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