A Phenomenological Mohr—Coulomb Failure Criterion for Composite Laminates under Interlaminar Shear and Compression

Abstract

A new phenomenological delamination criterion has been proposed for considering the effects of through-thickness compression based on a modified Mohr—Coulomb friction mechanism. Published experimental results show that through-thickness compressions increase the interlaminar shear (ILS) strength nonlinearly, which requires a nonlinear friction function. The proposed delamination criterion with a nonlinear friction function considers the full extent of the ILS increase observed in available experiments. Excellent agreements have been achieved between predicted and experimental failure envelopes with proper selections of parameters. The present theory is able to predict the shear strength enhancement in the presence of friction and compression more accurately than current methods. The strain rate effect on compression dependent ILS of composite laminates is also addressed qualitatively.

Keywords

delamination interlaminar shear through-thickness compression criterion high strain rate.

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