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Comment to the paper ‘Analysis of Progressive Matrix Cracking in Composite Laminates II. First Ply Failure’ by George J Dvorak and Norman Laws

Dvorak and Laws published in Ref. 1 a paper that addresses transverse cracking of composite laminates for small crack densities. An accurate cracking criterion is obtained by means of linear elastic fracture mechanics. The equations developed in the paper are used by many researchers – this is shown by the 75 citations in the last 25 years. More significantly, the 44% of the citations occurred in the last decade. Furthermore, to the authors’ knowledge, the expressions developed are implemented in design codes used by the aerospace and aeronautical companies. The determination of the elastic energy stored in the ply requires the computation of its compliance, denoted as ij in Ref. 1. Equation 3 in the commented paper is written as: