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<p>A thickness variation in laminate composites is achieved by changing the number of plies in proportion to the change in thickness. This variation requires the termination of plies within the laminate. Ply termination is referred to as the ply-drop one. Two different ply-drop configurations are taken for analysis of delamination prediction under tensile loading conditions, such as staircased-grouped and staircased-dispersed. Commercial finite element software package ANSYS 14.0 is used. To construct the model geometry the layered 3-D finite element (SOLID 20 node 186) is considered. It consists of six degrees of freedom at each node. The Tsai-Wu failure criterion is used to obtain the value of the failure factor for separate plies. Interlaminar stress variations along the interface of plies are determined to initialize the possible delamination sites. For both configurations, the value of the failure factor is found to be maximum at the position of the first resin pocket tip. In case of staircased-grouped, the delamination growth occurred at position near the thin section, but in case of staircased-dispersed, it is spread at discrete positions over the laminate.</p>

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Delamination Prediction on Staircased-Dispersed Tapered Laminate Composite

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • G. Chaudhary,
  • A. Dey,
  • A. K. Dey

摘要

A thickness variation in laminate composites is achieved by changing the number of plies in proportion to the change in thickness. This variation requires the termination of plies within the laminate. Ply termination is referred to as the ply-drop one. Two different ply-drop configurations are taken for analysis of delamination prediction under tensile loading conditions, such as staircased-grouped and staircased-dispersed. Commercial finite element software package ANSYS 14.0 is used. To construct the model geometry the layered 3-D finite element (SOLID 20 node 186) is considered. It consists of six degrees of freedom at each node. The Tsai-Wu failure criterion is used to obtain the value of the failure factor for separate plies. Interlaminar stress variations along the interface of plies are determined to initialize the possible delamination sites. For both configurations, the value of the failure factor is found to be maximum at the position of the first resin pocket tip. In case of staircased-grouped, the delamination growth occurred at position near the thin section, but in case of staircased-dispersed, it is spread at discrete positions over the laminate.