Mixed mode I plus II interlaminar fracture of carbon/epoxy laminates

作者：Pereira A B; De Morais A B^*

来源：Composites Part A: Applied Science and Manufacturing , 2008, 39(2): 322-333.

DOI：10.1016/j.compositesa.2007.10.013

• polymer-matrix composites (PMCs)
• fracture toughness
• delamination
• finite element analysis (FEA)

This paper reports a study of the mixed mode I + II fracture of carbon/epoxy unidirectional and multidirectional specimens with symmetric, quasi-symmetric and markedly asymmetric legs. A beam model was developed for predicting the compliance and total strain energy release rate, G. Its predictions agreed well with three-dimensional finite element models and with experimental data of double cantilever beam, end-notched flexure and mixed-mode bending tests. The mode mix was determined from a virtual crack closure technique limit value analysis, in order to overcome ambiguity for delaminations between differently oriented plies. Initiation G(c) values versus mode II ratio G(II)/G plots had practically identical shapes,

• 出版日期2008