Damage development and property degradation in composite materials

I. M. Daniel*, J. W. Lee, G. Yaniv

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


Damage mechanisms and accumulation and associated stiffness reductions were investigated in crossply graphite/epoxy laminates subjected to tensile cyclic loading. Damage development consists of transverse matrix cracking, followed by longitudinal matrix cracking, local delaminations at crack intersections, and ultimately longitudinal fiber fractures of the primary load carrying plies. The reduction in axial modulus, even in normalized form, is a function of the cyclic stress level. The degradation of in-plane shear modulus was also monitored and found to be highly sensitive to longitudinal matrix cracking. The relationship between stiffness degradation and residual fatigue life was discussed.

Original languageEnglish (US)
Pages (from-to)149-160
Number of pages12
JournalAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
StatePublished - 1988
EventMechanics of Composite Materials, 1988 - Berkeley, CA, USA
Duration: Jun 20 1988Jun 22 1988

ASJC Scopus subject areas

  • Mechanical Engineering


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