Post-buckling of composite I-sections. Part 1: Theory

Date

2001-01-01

Author

Papila, M
Akgun, MA

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A theoretical investigation of initial local buckling and post-buckling behavior of composite I-sections is presented. The equilibrium equation for initial buckling is solved both exactly and with an approximate method, namely, Galerkin's method. In Galerkin's method, the out-of-plane deflection of each plate element is approximated by a weighted sum of polynomial functions. The post-buckling response is studied as an extension of the approximate analysis with Galerkin's method where now both equilibrium and compatibility equations must be solved. The bending deflection in the post-buckling regime is assumed to be a magnification of the deflection function used in initial buckling analysis. No mode-shape change is thus allowed in the post-buckling region. A polynomial type of function is also adopted for stress distribution in order to take into account the deviation from uniform in-plane load distribution in the plate elements following the onset of local buckling. The paper provides an efficient and accurate method for predicting the post-buckling behavior of composite structural sections composed of plate elements. Galerkin's method was previously applied to isotropic flat plates only. The present approach is tested against a commercial code, STAGS, with a very good agreement in results and a very large saving in computer time for post-buckling analysis of an I-section.

Subject Keywords

Composite, Buckling, Post-buckling, Galerkin, L-section

URI

https://hdl.handle.net/11511/64893

Journal

JOURNAL OF COMPOSITE MATERIALS

DOI

https://doi.org/10.1106/yl8g-2b86-jljv-1u1p

Collections

Department of Aerospace Engineering, Article

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Citation Formats

M. Papila and M. Akgun, “Post-buckling of composite I-sections. Part 1: Theory,” JOURNAL OF COMPOSITE MATERIALS, pp. 774–796, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64893.