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Anticipating the induced delamination formation in composite laminates subjected to bending loads

In this research, the effects of induced delamination on the variation
of the mechanical properties of composite laminates subjected to bending
loads are investigated using a micromechanical model. For this purpose,
the variation of the mechanical properties of delaminated laminates is
determined using stress analysis of damaged ply and classical laminate
theory (CLT) relationships. Using the proposed model and CLT, the
fracture toughness due to induced delamination formation is presented in
cross-ply laminates. Subsequently, the variation of strain energy
release rate (SERR) is calculated in terms of crack density using
analytical and finite element models to detect dominant failure modes in
different crack densities. The results are compared with those of matrix
cracking propagation. The results obtained by the proposed analytical
model are in good agreement with those obtained by existing numerical
and experimental approaches. The proposed model can be utilized to
predict induced delamination formation in composite laminates subjected
to bending loads.