CALCULATION OF LOCAL BUCKLING LOAD OF COMPOSITE THIN RECTANGULAR TUBE BASED ON THIN PLATE DEFLECTION THEORY

Abstract

Abstract: A calculation method for the local buckling load of a composite rectangular thin-walled tube is proposed. The wall plate of the composite rectangular thin-walled tube under the axial compression load is regarded as the one-way compression anisotropic plate, and the elastic embedded coefficient is introduced into the solution of the equilibrium differential equation, and the rectangular thin-walled tube of the composite material is obtained, as well as the analytical formula of the buckling load. Compared with the experimental data in the literature and the finite element results of this paper, the correctness of the computational model is verified. The applicable range of the calculation model is analyzed by quantitative calculation of the equivalent stiffness coefficients of four kinds of laminated composite rectangular thin-walled tubes. Combined with the calculation formula of Euler′s buckling load of composite members, the calculation formula of buckling load considering the overall instability and local instability is obtained. It is found that when the layup parameters are constant, there is a critical aspect ratio that distinguishes between local buckling and Euler buckling.

Key words: composite rectangular thin-walled tube, local buckling, euler buckling, laminated plate stiffness
coefficient

CLC Number:

TB332

ZHU Xiu-jie, XIONG Chao, YIN De-jun, YIN Jun-hui. CALCULATION OF LOCAL BUCKLING LOAD OF COMPOSITE THIN RECTANGULAR TUBE BASED ON THIN PLATE DEFLECTION THEORY[J]. Composites Science and Engineering, 2019, 0(11): 30-36.

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