Intralaminar and interlaminar fracture in graphite/epoxy laminates |
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| Affiliation: | 1. Advanced Composites Research Group (ACRG), School of Mechanical and Aerospace Engineering, Queen’s University Belfast, Belfast BT9 5AH, UK;2. Technical University of Munich, Department of Mechanical Engineering, Boltzmannstraße 15, 85748 Garching, Germany;3. Department of Mechanical and Industrial Engineering, UNIDEMI, Faculty of Sciences and Technology, NOVA University of Lisbon, 2928-516 Caparica, Portugal;1. DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. Optics and Experimental Mechanics Laboratory, INEGI, Campus da FEUP, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. Mechanical and Materials Engineering Department, University of Western Ontario, London, Canada;2. Mechanical Engineering Department, American University of the Middle East, Kuwait;3. Mechanical Engineering Department, United Arab Emirates University, Al Ain, P.O. Box 15551, United Arab Emirates;4. On leave from Mechanical Design Department, Faculty of Engineering-Matareya, Helwan University, Cairo, Egypt |
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| Abstract: | Various matrix failure modes (intralaminar and interlaminar) in T300/934 graphite/ epoxy laminates are studied. The intralaminar mode is considered by using centre-notchedtension. surface-notched-tension, three-point-bend and compact-tension specimens where transverse fracture toughness and 0° split initiation are investigated. The interlaminar fracture is studied by using double-cantilever-beam and cracked-lap-shear specimens for mode 1 and mode 2 respectively. A simple method for the prediction of split initiation is given and it is seen that the predicted and experimental results agree well. In addition to testing the dry specimens. a few hygrothermal conditions are also used to assess the influence of environment on various failure modes. The effect of environment shows a mixed trend on fracture toughness depending on damage mechanisms involved in the failure modes. The moisture and temperature show a deleterious effect on interface-controlled failure modes, but a beneficial effect on the modes controlled by matrix cleavage. |
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