Buckling Behavior Of Laminates Composite Under Compressive Loading

Siti Haryani, Harun (2009) Buckling Behavior Of Laminates Composite Under Compressive Loading. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research is dedicated to the study of buckling behavior of composite panels subjected to compressive loading. It focuses on the in vestjgation buckling behavior of composite structures. Fabrication of test specimen which includes two types of materials that are CFRP and GFRP are made prior to compression test as per ASTM 0695, with dimension of 75 mm x 10 mm x 2 mm. The effect of loading rate is also considered in this study. with the range of 1.3 mmlmin to 1.5 mm/min. Under compressive loading, for CFRP laminates, woven possessed higher stiffness and compressive strength. At loadjng rate of I .3 mm/min, the stiffness and compressive strength are low. For the GFRP laminate, the specimens showed highest stiffness at loading rate of 1.5 mm/min. Comparison between CFRP (woven) and GFRP (woven) showed that CFRP (woven) is higher in terms of stiffness as well as compressive strength. At microscopic level, from SEM micrograph, it is observed that for CFRP laminates, fi·acture surface is relatively smooth and consists of a network of blocky outcrops of fibres and resin at different level. The transverse strength of laminae is poor compared to the longitudinal tensile strength. The fracture surfaces show the failure of single fibres , kink band, and microbuckling for each specimen. For OFRP laminates, the fracture surface consists of bundle of fibres and overlapping platelet topography in the resin, termed hackles or lacerations. In the compressive fracture region, striation can be seen on both the fibres and the epoxy. lt is observed that there are some similarities between two types of materials that is fonnation of kinking band and microbuckling failure surface. Both of materials have a longitudinal fracture bundle of fibre and the other fibre fracture in different direction (longitudinal). From the numerical simulation via Nastran/Patran, at preliminaJy stage, it is found that the CFRP laminates showed the buckling behavior with stiffness higher than GFRP when load is applied at 1.3 mm/min, while the critical load ofGFRP is lower than CFRP.

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