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<p>This paper introduces a novel approach, the coupled wavelength postbuckling analysis (CWPAN), to study the postbuckling behaviour of composite laminates under various conditions. CWPAN utilizes sinusoidal solutions, derived from the exact strip method, to represent in-plane displacements, strains, and stresses, reducing the size of the stiffness matrix, and thereby the computational expense. To handle progressive out-of-plane displacements along the postbuckling path, a novel Newton iteration scheme, based on the Exact Strip Method, is employed. By transforming nonlinear equations into linear ones, CWPAN maintains stability for postbuckling nonlinearities. The efficacy and efficiency of CWPAN is illustrated by comparisons with finite element method.</p>

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Coupled wavelength postbuckling analysis of composite laminates under compression and shear

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Kai Zhao,
  • David Kennedy,
  • Carol A. Featherston,
  • Xiaoyang Liu

摘要

This paper introduces a novel approach, the coupled wavelength postbuckling analysis (CWPAN), to study the postbuckling behaviour of composite laminates under various conditions. CWPAN utilizes sinusoidal solutions, derived from the exact strip method, to represent in-plane displacements, strains, and stresses, reducing the size of the stiffness matrix, and thereby the computational expense. To handle progressive out-of-plane displacements along the postbuckling path, a novel Newton iteration scheme, based on the Exact Strip Method, is employed. By transforming nonlinear equations into linear ones, CWPAN maintains stability for postbuckling nonlinearities. The efficacy and efficiency of CWPAN is illustrated by comparisons with finite element method.