Abstract
Delamination is one of the most important failure modes of composite structures. In the present paper, measurement of the interlaminar fracture toughness under static and impact loading as well as estimation of the compressive strength of delamination embedded composite plates have been investigated. A stabilized end-notched flexure test proposed by the present authors is introduced as a mode II interlaminar fracture toughness test, and some experimental data are presented. The interlaminar fracture toughness under impact loading is also estimated using an instrumented drop-weight impact test system, with which the effect of the loading rate on the mode II interlaminar fracture toughness is investigated. Instability-related delamination growth is examined experimentally and analytically by applying in-plane compressive load to an embedded through-width delamination sandwich column specimen.
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