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Results of an experimental investigation of cumulative damage development in two unnotched quasi-isotropic graphite/epoxy laminates subjected to quasistatic tension and tension-tension fatigue are presented. Damage development in the form of transverse cracking in all off-axis laminae, longitudinal cracking, and delamination was monitored via the surface replication technique. Results of the study include a detailed description of the chronology of damage development prior to failure. Evidence also is presented in support of a damage model based on the concept of a characteristic damage state.
transverse cracking, saturation spacing, characteristic damage state, monotonic tension, tension-tension fatigue, composite materials
Senior research scientist, General Dynamics Corp., Fort Worth, Tex.
Professor, Virginia Polytechnic Institute and State University, Blacksburg, Va.