Damage Initiation And Propagation In Composite Materials Subjected To Tensile And Compression Loading

Nurul Azwa, Abdul Rahman (2009) Damage Initiation And Propagation In Composite Materials Subjected To Tensile And Compression Loading. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Today, composite materials are useful in reticular structures, however their structure performance related to damage of fresh composite material. This research investigates the damage initiation and propagation for laminated composite under low and high velocity subjected to tensile and compression test. Three types of composite material are used, which include the uni-directional carbon fibre, woven carbon fibre and woven glass fibre. Tensile test as per ASTM D3039 was carried out at different velocity ranging from 0.6mm/min to l .Omm/min and Compression tests as per ASTM D695 was carried out velocity of 0.2mmlmin to 0.6mmlmin. The effect of this tensile and compression test at on the specimen were analyzed by using scanning electron micrograph (SEM). The damage modes considered are initial matrix cracking, saturation of matrix cracking, kind band, damage propagation and fiber breakage. The progressive failure is expressed by reducing stiffness of the material at all failed points. The lowest stiffness drop occurred in the laminates with the lowest edge crack density. The orientations of fibre affected the crack density of composite material. To get a clear observation on damage initiation and propagation of composite material, analyses of failure for three of type material were compared by discussing their different damage mechanism. For comparison, the data of mechanical testing was simulated using Finite Element Analysis (PEA), by Cosmos Xpress.

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