复合材料板拉/压-剪复合载荷屈曲相关方程

doi:10.7527/S1000-6893.2021.25417

Abstract

Abstract: An interaction function is constructed using axial tension/compression and in-plane shear loads, and further expanded into a quadratic polynomial by power series. Based on mathematical principles and reasonable hypotheses, the polynomial coefficients are determined using the buckling load of the composite plate measured by a uniaxial test. The buckling interaction formulae of composite plates under combined axial tension/compression and shear loads are then established. The problem that the traditional buckling interaction formulae are not suitable for composite plates (particularly for unbalanced laminates) is thereby solved mathematically and rationally. The buckling interaction curves of four different unbalanced ply composite plates under axial tension/compression and shear loads are predicted with the interaction formulae proposed in this paper, and compared with the simulation results of the finite element eigenvalue method. The comparison shows a good agreement. For the traditional interaction formulae, the prediction error increases with the increasing unbalanced degree of composite laminates. Finally, the validity of the proposed interaction formulae is verified by the compression shear tests of composite stiffened panels with balanced laminates.

Key words: composites, unbalanced, combined loads, buckling, interaction formulae

CLC Number:

CHEN Xiangming, CHEN Puhui, SUN Xiasheng, WANG Binwen, WANG Zhe, ZHANG Hui, CHAI Yanan. Buckling interaction formulae of composite plates under combined axial compression/tension and shear loads[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(12): 225417-225417.

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Buckling interaction formulae of composite plates under combined axial compression/tension and shear loads

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