Finite-Layer Method: Determining the Critical Size of an Interlaminar Crack in the Curved Zone of a composite T-Stringer

摘要

Using the finite-layer method, values of the modal components G(I) and G(II) and the total value of energy release rate G(T) for tips of an interlaminar cylindrical crack in the curved zone of a reinforcing composite stringer are calculated. Reliability of the results is confirmed by convergence on sequentially increasing the number of layers and by comparison of the values G(T) obtained in two different ways. Parametric studies are carried out, and the ranges of allowable crack dimensions are constructed for two loading cases: the crack is opened (1) and closed (2).