Abstract
The objective of this investigation is to study the effect of non-woven carbon tissue (NWCT) in order to fundamentally understand the impact damage mechanism of hybrid composites with NWCT. Damage mechanism of of hybrid composites was investigated under a quasi-static indentation loading condition with a steel ball as an indentor. Four kinds of cross-ply laminates were studied; i.e. CFRP laminates ([05/905/05] and [03/903/03/903/03]) and hybrid laminates ([05//905//05] and [03//! 903//03//903//03]). Here, the symbol // means that the NWCT layer is located at an interface between the CFRP layer interfaces. Under the same condition of the indentation energy, the total delamination area of the [05//905//05]hybrid specimen was about 56% smaller than that of the [05/905/05] CFRP specimen, and also the [03//903//03//903//03] hybrid specimen was about 38% smaller than that of the [03/903/03/903/03] CFRP specimen. The mechanism of the NWCT interleaving's effect was clarified based on the observation of damage on the specimens' crosssections cut after testing. It was found that the Mode II interlaminar fracture is predominant in the delamination by the indentation loading.
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