DEFORMATION AND FAILURE ANALYSIS OF SYMMETRIC AND ANTI-SYMMETRIC GRAPHITE/EPOXY LAMINATE DUE TO VARIATIONS IN FIBER ORIENTATION

Azizul Samsudin, Ahmad Hussain, Jamaluddin Mahmud
2015 unpublished
This paper aims to simulate and analyse the failure behaviour, deformation behaviour and mode of failure of composite laminate using the built-in failure criteria function provided by ANSYS. Finite element modelling and analysis of symmetric and anti-symmetric Graphite/ Epoxy laminate with various angles of fiber orientation subjected to uniaxial tension are performed. Maximum Stress Theory and Tsai-Wu Failure Criteria are employed to determine the failure load (failure index = 1). Prior to
more » ... = 1). Prior to that, numerical validation and convergence analysis are carried out. The failure loads (First ply failure, FPF and last ply failure, LPF loads) and corresponding stresses (σx, σy and τxy) predicted from the finite element simulation using ANSYS are then transformed to determine the principal stresses (σ1, σ2 and τ12) using a MATLAB programme, specifically developed for stress transformation computation. Principal stresses are then used to determine the modes of failure (fiber failure, matrix failure or shear stress) of each layer corresponding to specific angle of fiber orientation. The failure curves (FPF and LPF) for both laminates (symmetric and anti-symmetric) and both theories (Maximum Stress Theory and Tsai-Wu) are plotted and found to be very close to each other. Therefore, it can be concluded that the current study is useful and significant in enhancing knowledge about the failure behaviour, deformation behaviour and mode of failure of composite laminate.
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