Time-Dependent Internal Damage Progress and Residual Strength in Notched Composite Laminates

Abstract

Full-field strain measurement is implemented in order to detect the time-dependent occurrence and progress of internal damage during tensile creep loading condition for CFRP notched laminates. Employing digital image correlation method, the damage occurrence and increase with accelerated time is in-situ observed, subjected to time-temperature superposition principle, under a creep load condition. The creep load test is interrupted after 1 hour in real time, which corresponds to various accelerated time; the accelerated rate depends on test temperature. Tensile residual strength of the interrupted test specimen is then examined. While the internal damage increases with the creep loading time, the residual strength also increases with time in the range of this study.