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    Ply cracking and stiffness degradation in cross-ply laminates under biaxial extension, bending and thermal loading

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    Publication date
    2005
    Author
    Lam, Dennis
    Zhang, D.
    Ye, J.
    Keyword
    Ply Cracking
    Cross-Ply Laminates
    Biaxial Extension
    Bending
    Thermal Loading
    State Space
    Interlaminar Stress
    Property Degradation
    Peer-Reviewed
    Yes
    
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    Abstract
    Transverse ply cracking often leads to the loss of stiffness and reduction in thermal expansion coefficients. This paper presents the thermoelastic degradation of general cross-ply laminates, containing transverse ply cracks, subjected to biaxial extension, bending and thermal loading. The stress and displacement fields are calculated by using the state space equation method [Zhang D, Ye JQ, Sheng HY. Free-edge and ply cracking effect in cross-ply laminated composites under uniform extension and thermal loading. Compos Struct [in press].]. By this approach, a laminated plate may be composed of an arbitrary number of orthotropic layers, each of which may have different material properties and thickness. The method takes into account all independent material constants and guarantees continuous fields of all interlaminar stresses across interfaces between material layers. After introducing the concept of the effective thermoelastic properties of a laminate, the degradations of axial elastic moduli, Poisson's ratios, thermal expansion coefficients and flexural moduli are predicted and compared with numerical results from other methods or available test results. It is found that the theory provides good predictions of the stiffness degradation in both symmetric and antisymmetric cross-ply laminates. The predictions of stiffness reduction in nonsymmetric cross-ply laminates can be used as benchmark test for other methods.
    URI
    http://hdl.handle.net/10454/5555
    Version
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    Citation
    Zhang, D., Ye, J. and Lam, D. (2005). Ply cracking and stiffness degradation in cross-ply laminates under biaxial extension, bending and thermal loading. In: Proceedings of the 13th International Conference of Composite Structures, Australia.
    Type
    Conference paper
    Collections
    Engineering and Informatics Publications

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