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International Journal of Damage Mechanics
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Over-leg Bending Test for Mixed-mode I/II Interlaminar Fracture in Composite Laminates

András Szekrényes

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

József UJ

Department of Applied Mechanics, Budapest University of Technology and Economics, Budapest, PoB 11, H-1521, Hungary

In this work the over-leg bending (OLB) specimen is developed for mixed-mode I/II delamination characterization in composites. The traditional single-leg bending (SLB) specimen is modified by introducing the load eccentrically between the two supports of a three-point bending setup. The modified configuration is analyzed by using linear beam theories. The theories of transverse shear, Winkler-Pasternak-type elastic foundation, Saint-Venant effect, and crack tip shear deformation are incorporated in the analysis. Also, experiments are carried out on glass/polyester unidirectional specimens. Comparison between the results of analysis and experiment shows very good agreement. The traditional SLB and the novel OLB coupons are compared, and their advantages and drawbacks are highlighted. The newly developed OLB setup is relatively easier to perform and crack propagation may be simply investigated under displacement control.

Key Words: composite delamination • beam theory • mode-mixity • fracture • SLB specimen • OLB specimen

International Journal of Damage Mechanics, Vol. 16, No. 1, 5-33 (2007)
DOI: 10.1177/1056789507060774
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