COMPOSITES SCIENCE AND ENGINEERING ›› 2024, Vol. 0 ›› Issue (11): 34-42.DOI: 10.19936/j.cnki.2096-8000.20241128.004

• BASIC STUDY • Previous Articles     Next Articles

Equivalent stiffness of composite sinusoidal corrugated panels

WANG Houbing1, QU Tianjiao1, CHENG Linan1, WEI Jingchao1, LI Xinxiang1, ZHU Qiang2   

  1. 1. National Key Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China, Xi’an 710065, China;
    2. Department of Structure and Strength, Special Vehicle Research Institute of China, Jingmen 448035, China
  • Received:2024-05-20 Online:2024-11-28 Published:2025-01-14

Abstract: Based on the homogenization theory of composites, carbon fiber reinforced polymer(CFRP) sinusoidal corrugated panels were equivalent to orthogonal anisotropic plate. According to the principle of strain energy conservation, a method for each stiffness component in the equivalent orthogonal anisotropic plate stiffness matrix was established. Using the finite element method, a representative element model of composite sinusoidal corrugated panels was established. Based on the constitutive equation of laminates, six boundary conditions were constructed to verify the theoretical method of stiffness components. The verification shows that the theoretical results have good consistency with the finite element simulation results. The influence of amplitude and wavelength, two geometric parameters controlling the shape of sinusoidal corrugated panels, on the stiffness of the corrugated panels was studied using a validated stiffness method. The equivalent stiffness of a corrugated panel was compared with the stiffness of its laminated plate. The research results show that the influence of amplitude and wavelength on the stiffness component of corrugated panels is nonlinear; compared to laminated plates, the tensile stiffness of corrugated direction is significantly reduced, while the bending stiffness in the vertical corrugated direction is significantly increased.

Key words: corrugated panel, equivalent stiffness, composites, homogenization, finite element analysis

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