The elastic interaction of multiple delaminations in laminated structures subject to out of plane loading has been investigated. This has been done by utilizing beam theory approximations of elasticity. Shielding and amplification of the energy release rate of the cracks has been quantified for the case of a cantilever beam. Results show important short and long range interactions between these cracks, depending mostly on their transverse spacing. The results have some similarity to those found by other investigators for the interaction of cracks in infinite bodies, but with strong modification of certain characteristics by mode ratio and thickness effects. The shielding and amplification effects strongly influence the propagation of the system of cracks leading to local instabilities, local strain hardening and crack arrest. The results are being validated using finite element solutions.
Elastic interaction of multiple delaminations in laminated structures
MASSABO', ROBERTA;
2004-01-01
Abstract
The elastic interaction of multiple delaminations in laminated structures subject to out of plane loading has been investigated. This has been done by utilizing beam theory approximations of elasticity. Shielding and amplification of the energy release rate of the cracks has been quantified for the case of a cantilever beam. Results show important short and long range interactions between these cracks, depending mostly on their transverse spacing. The results have some similarity to those found by other investigators for the interaction of cracks in infinite bodies, but with strong modification of certain characteristics by mode ratio and thickness effects. The shielding and amplification effects strongly influence the propagation of the system of cracks leading to local instabilities, local strain hardening and crack arrest. The results are being validated using finite element solutions.
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