Instability-related delamination growth in thermoset and thermoplastic compositesMixed-mode crack propagation in compressively loaded thermoset and thermoplastic composite columns with an imbedded through-width delamination is investigated. Beam theory is used to analyze the geometrically nonlinear load-deformation relationship of the delaminated subregion. The elastic restraint model (ERM), combined with existing FSM modeling of the crack-tip region, yields expressions for the Mode I and Mode II components of the strain energy release rate G(I) and G(II) to predict the critical load at the onset of delamination growth. Experimental data were generated for geometries yielding a wide range of G(I)/G(II) ratios at the onset of crack growth. A linear mixed-mode crack growth criterion in conjunctuion with the ERM provides good agreement between predicted and measured critical loads for both materials studied.
Document ID
19890028914
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Gillespie, John W., Jr. (Delaware, University Newark, United States)
Carlsson, Leif A. (Florida Atlantic University Boca Raton, United States)
Rothschilds, Robert J. (Delaware Univ. Newark, DE, United States)