Experimental Characterization of Microscopic Damage Initiation and Growth in Quasi-Isotropic CFRP Laminates.

1 January 1996

journal article
Published by Japan Society of Mechanical Engineers in TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

Vol. 62 (602) , 2250-2255
https://doi.org/10.1299/kikaia.62.2250

Abstract

Microscopic damage progress under static tensile loading in quasi-isotropic CFRP laminates is observed using a scanning acoustic microscope (SAM) and an optical microscope. Both plain specimens and specimens with circular holes are tested. By observing the edges of the plain specimens, the transverse crack density is measured as a function of laminate stress. By SAM observation of the specimens with holes, delamination onset and growth are detected. To discuss the delamination onset around the hole, the energy release rate associated with the delamination onset is calculated following O'Brien and Raju (AIAA-84-0961, (1984) 526-536). The energy release rate predictions are qualitatively consistent with experimental observations.

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