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Journal of Composite Materials
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Mode-II Fracture in E-glass-polyester Composite

András Szekrényes

Department of Applied Mechanics, Budapest University of Technology and Economics, Budapest, P.O. Box 11, H-1521, Hungary, szeki{at}mm.bme.hu

József Uj

Department of Applied Mechanics, Budapest University of Technology and Economics, Budapest, P.O. Box 11, H-1521, Hungary

In this work a novel beam analysis of the end-loaded split (ELS) and over-notched flexure (ONF) specimens are presented. New compliance and strain energy release rate equations are developed incorporating crack tip deformation and transverse shear analysis. The Saint Venant effect at the clamped end of the ELS specimen is also considered. Unidirectional glass-polyester specimens are manufactured and experimental (initiation and propagation) tests are performed to confirm the theoretical models. The experimental data is evaluated by means of four reduction techniques: the exact beam theory, virtual crack closure technique, compliance calibration method, and direct beam theory. It is shown that the results by the four methods agree quite closely; however, the compliance calibration method is not recommended for initiation data reduction in the case of the ONF specimen. The ELS specimens suffer from relatively large displacements. Thus, propagation tests are not possible to be performed. The ONF test seems to be a better tool to evaluate the mode-II toughness of composite materials with low flexural modulus.

Key Words: delamination • strain energy release rate • crack tip deformation • transverse shear • end-loaded split • over-notched flexure

This version was published on October 1, 2005

Journal of Composite Materials, Vol. 39, No. 19, 1747-1768 (2005)
DOI: 10.1177/0021998305051120
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Home page
 International Journal of Damage MechanicsHome page
A. Szekrenyes and J. UJ
Over-leg Bending Test for Mixed-mode I/II Interlaminar Fracture in Composite Laminates
International Journal of Damage Mechanics, January 1, 2007; 16(1): 5 - 33.
[Abstract] [PDF]