Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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CHARACTERIZATION OF DELAMINATION FRACTURE SURFACES UNDER MIXED MODE LOADING

R.M.M. Marat-Mendes  M.M. de Freitas       

Anales de la Mecánica de la Fractura, nº 27 . 2010 . Pág. -
Ver (.pdf): 64

Resumen: Delamination is an important mode of failure on laminated composite materials and the characterization of this failure mode is a subject of research. Mode I, mode II, mode III and mixed-mode I+II fracture toughness were obtained using the double cantilever beam test (mode I), the end notch flexure test (mode II), the original and the modified edge crack torsion test (mode III) and the mixed-mode bending test (mixed-mode I+II) respectively. Fracture surfaces obtained during mode III interlaminar fracture toughness of glass/epoxy composites have been also studied using the original and the modified edge crack torsion test geometry. Results were compared with delaminating surfaces obtained during tests of mode I, mode II and mixed-mode I+II. In the original ECT test the hackle marks appears only in the side of the loading pin. In the modified ECT test the hackle marks appears in both sides of the sample and slightly less well defined and smoother fracture features in the middle of the sample.

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Escola Superior de Tecnologia de Setúbal, Campus do IPS, Estefanilha, 2910-761 Setúbal, Portugal
Instituto Superior Técnico, Universidade Técnica de Lisboa Av. Rovisco Pais, 1049-001 Lisboa, Portugal





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