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Interlaminar fracture under mixed-mode II + III and I + III
Morais, A. B. de; Pereira, A. B.This paper presents two new interlaminar fracture test methods for mixed-mode II + III and I + III loadings. Both tests involve biaxial bending of edge pre-delaminated plate specimens with a cross-ply lay-up. The tests allow the coverage of a wide range of mode mix ratios. However, they require finite element analyses for selecting specimen configurations and experimental data reduction. Moreover, a relatively ...
Mixed mode I + II interlaminar fracture of carbon/epoxy laminates
Pereira, A. B.; Morais, A. B. deThis paper describes 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. Model predictions agreed well with three-dimensional finite element results for double cantilever beam, end-notched flexure and m...
A new data reduction scheme to obtain the mode II fracture properties of Pinus ...
Silva, M. A. L.; Moura, M. F. S. F. de; Morais, A. B. de; Morais, J. J. L.In this work a numerical study of the End Notched Flexure (ENF) specimen was performed in order to obtain the mode II critical strain energy released rate (GIIc) of a Pinus pinaster wood in the RL crack propagation system. The analysis included interface finite elements and a progressive damage model based on indirect use of Fracture Mechanics. The difficulties in monitoring the crack length during an experimen...
Prediction of the longitudinal tensile strength of polymer matrix composites
Morais, A. B. deA micromechanical model was developed for the prediction of the longitudinal tensile strength of polymer matrix composites. The model considers successive fibre breaks within an infinitely wide Li-long representative volume element (RVE), Li being the so-called ineffective length. An elastic-plastic stress transfer model is used to define Li and fibre strength is described by a Weibull distribution. The composi...
Finite element analysis of the ECT test on mode III interlaminar fracture of ca...
Moura, M. F. S. F. de; Silva, M. A. L.; Morais, A. B. de; Morais, J. J. L.In this work a parametric study of the Edge Crack Torsion (ECT) specimen was performed in order to maximize the mode III component (GIII) of the strain energy release rate for carbon-epoxy laminates. A three-dimensional finite element analysis of the ECT test was conducted considering a [90/0/(+45/-45)2/(-45/+45)2/0/90]S lay-up. The main objective was to define an adequate geometry to obtain an almost pure mode...
A new methodology for the characterization of mode II fracture of pinus pinaste...
Moura, M. F. S. F. de; Silva, M. A. L.; Morais, J. J. L.; Morais, A. B. de; Lousada, J. L.In this study, the End Notched Flexure (ENF) fracture test was used to obtain the mode II Rcurve of the Pinus pinaster wood in the RL crack propagation system. The test method was numerically and experimentally analyzed. In the numerical study, three (3D) and twodimensional (2D) finite element analyses were conducted to determine the mode II critical strain energy release rate (GIIc) and the respective R-curve....
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