Influence of load ratio on the biaxial fatigue behaviour and damage evolution in glass/epoxy tubes under tension–torsion loading |
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| Affiliation: | 1. ESTSetúbal, Instituto Politécnico De Setúbal, Campus do IPS, Estefanilha, 2910-761 Setúbal, Portugal;2. IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;3. ISEL, Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro, 1, 1959-007 Lisboa, Portugal;1. Department of Management and Engineering, University of Padova, Stradella S. Nicola 3, Vicenza, Italy;2. Department of Wind Energy, Technical University of Denmark, Risø Campus, DK-4000 Roskilde, Denmark;3. Composite Centre Sweden, Luleå University of Technology, SE-971 87 Luleå, Sweden;4. Department of Aerospace Engineering, Texas A&M University, College Station, TX, USA;1. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran;2. Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran |
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| Abstract: | An extensive experimental campaign was carried out to understand the influence of the multiaxial stress state and load ratio on the matrix-dominated damage initiation and evolution in composite laminates under fatigue. Tubular glass/epoxy specimens were tested under combined tension–torsion loadings with different values of the load ratio and biaxiality ratio (shear to transverse stress ratio). Results are reported in terms of S–N curves for the first crack initiation and Paris-like diagrams for crack propagation, showing a strong influence of both parameters. Fracture surfaces were also analysed to identify the damage mechanisms at the microscopic scale responsible for the initiation and propagation of transverse cracks. Eventually, a crack initiation criterion presented by the authors in a previous work is applied to the experimental data showing a good agreement. |
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| Keywords: | B Fatigue C Damage mechanics D Mechanical testing Multiaxial fatigue |
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