An Analysis for Delaminations Using Energy Release Rate in CFRP Laminates

에너지 해방률을 이용한 CFRP 적층복합재료의 층간분리 평가

  • Published : 2000.08.01


The understanding of impact-induced delamination is important in safety and reliability of composite structure. In this study, a model for arrest toughness is proposed in consideration of fracture behavior of composite materials. Also, the probabilistic model is proposed to describe the variability of arrest toughness due to the nonhomogeneity of material. For these models, experiments were conducted on the Carbon/Epoxy composite plates with various thickness using the impact hammer. The elastic work factor used in J-Integral is applicable to the evaluation of energy release rate. The fracture behavior can be described by crack arrest concept and the arrest toughness is independent of the delamination size. Additionally, a probabilistic characteristics of arrest toughness is well described by the Weibull distribution function. A variation of arrest toughness increases with specimen thickness.


CFRP Laminates;Energy Release Rate;Delamination;Probabilistic Analysis;Arrest Toughness


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