A simple method is proposed to calculate the dynamic stress intensity factors (DSIFs) based on the maximum crack opening displacement (MCOD) away from crack tip under plane strain conditions. In this work, aimed at a central through cracked infinite plate under impact loads, the relationship between the DSIF and the corresponding MCOD is identified by theoretical analysis. The finite element method is employed to study the application of the relationship under different model geometries, material properties and loading modes. The investigation indicates that the presented method is applicable to the finite plate models of different materials under arbitrary loading modes.

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