SEDL / STP / STP1012-EB / STP10409S

Damage Initiation and Growth in Notched Laminates Under Reversed Cyclic Loading

Bakis, CE
Research associate, research associate, professor, and Reynolds Metals professor, Virginia Polytechnic Institute and State University, Blacksburg, VA

Yih, HR
Research associate, research associate, professor, and Reynolds Metals professor, Virginia Polytechnic Institute and State University, Blacksburg, VA

Stinchcomb, WW
Research associate, research associate, professor, and Reynolds Metals professor, Virginia Polytechnic Institute and State University, Blacksburg, VA

Reifsnider, KL
Research associate, research associate, professor, and Reynolds Metals professor, Virginia Polytechnic Institute and State University, Blacksburg, VA

Pages: 18    Published: Jan 1989

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Abstract

The initiation and growth of fatigue damage in notched Cycom AS4/1808 graphite/epoxy laminates were investigated experimentally. Two layups, (0/45/90/−45)^s4 and (0/45/0/−45)^s4, provided contrasting responses to the fully reversed fatigue loads. Full-field strains and stresses surrounding the circular notch were evaluated at several stages of fatigue life with the photoelastic coating and adiabatic thermal emission measurement techniques and were related to the corresponding damage state and residual strength, stiffness, and life.