Effect of delamination on buckling strength of unidirectional glass-carbon hybrid laminates

Abstract

<span style="mso-bidi-font-size:13.0pt;color:black" lang="EN-GB">An experimental study is designed to understand the effect of delamination on critical buckling load and mode of failure for glass/carbon hybrid laminates. Firstly, delaminated specimens are compressed using a universal testing machine and buckling tests performed after the ends of each specimen are hinged to a special fixture designed to permit rotational boundary conditions. Non-linear buckling analysis based on incremental iteration method is conducted using finite element analysis (FEA) package (ANSYS) after conducting tensile tests to find the material properties. Critical buckling loads are found for symmetric [C0/G45/G-45/G90]s and anti-symmetric [C0/G45/G-45/G90//G90/G45/G-45/C0] laminate configurations with four different delamination lengths (a/L= 0.2, 0.3, 0.4 and 0.5) created at two different delamination positions (t/h = 0.5 and 0.25). In this study, the critical buckling load decreased as the delamination length increased. Moreover, the critical buckling load tended to decrease when the delamination approached the surface.

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