EVALUATION ON DISCRETE SOURCE DAMAGES OF CFRP STIFFENED PANELS

摘要

Engine debris penetration tests were conducted to evaluate the large notch damage and residual strength of composite stiffened panel. The damage mechanism was examined by progressive failure analysis based on Hashin 's failure criteria and cohesive zone model. The influence of delamination on the progressing notched damage path and initial failure load of the panel are investigated. The results reveal that typical damage path is characterized by fiber breakage perpendicular to the crack tips to be followed by skin/stringer interface damage. The numerical model has a potential capability to predict the debris penetration and residual strength of the damaged panel.