Mode II fracture characterization of a hybrid cork/carbon-epoxy laminate |
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| Affiliation: | 1. DEMec, FEUP, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. INEGI – Instituto de Engenharia Mecânica e Gestão Industrial, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;3. Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes and Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal;1. Center for Military Planning, Korea Institute for Defense Analyses, Seoul 02455, South Korea;2. Department of Applied Statistics, Korea University, 2511 Sejong-ro, Sejong-city, 30019, South Korea;1. INEGI–Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;2. DEMec, FEUP, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. Faculdade de Engenharia da Universidade do Porto, Departamento de Engenharia Mecânica, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. INEGI – Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;3. CMEMS – UMinho, Departamento de Engenharia Mecânica, Universidade do Minho, Campus de Azurém, 4804-533 Guimarães, Portugal;1. INEGI - Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. Center of Physics and Engineering of Advanced Materials (CeFEMA), Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;3. Instituto Superior de Engenharia de Lisboa, Av. Conselheiro Emídio Navarro No. 1, 1959-007 Lisboa, Portugal;4. Faculdade de Engenharia da Universidade do Porto, Departamento de Engenharia Mecânica, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;5. Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal |
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| Abstract: | Fracture characterization under mode II loading of a hybrid laminate composed by a unidirectional carbon fiber-epoxy composite and cork was performed using the End Notched Flexure test. A data reduction scheme based on equivalent crack length concept, specimen compliance and Timoshenko beam theory was applied to evaluate fracture toughness under mode II loading of a composed beam (cork and carbon-epoxy composite). The adopted procedure depends exclusively on the data issuing from load–displacement (P–δ) curve and does not require crack length monitoring during the test which is a difficult task to be accomplished with the necessary accuracy in the ENF test. A numerical analysis using cohesive zone modeling and an inverse procedure was performed to assess the mode II cohesive law that simulates the material fracture under shear loading. It was concluded that hybridization is advantageous relative to monolithic carbon-epoxy laminate in which concerns the observed failure mode, which altered from typically brittle to very ductile thus contributing to avoid sudden shear failures in real applications. |
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| Keywords: | A Hybrid B Fracture toughness C Damage mechanics D Mechanical testing |
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