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Experimental study of damage propagation in Over-height Compact Tension tests
Authors:Xiangqian Li  Stephen R Hallett  Michael R Wisnom  Navid Zobeiry  Reza Vaziri  Anoush Poursartip
Affiliation:1. Advanced Composite Center for Innovation and Science (ACCIS), University of Bristol, Queens Building, University Walk, Bristol, BS8 ITR, UK;2. Composites Group, Departments of Civil engineering and Materials Engineering, The University of British Columbia, Vancouver, BC., V6T 1Z4, Canada;1. Department of Materials Engineering, The University of British Columbia, 309-6350 Stores Road, Vancouver, BC V6T 1Z4, Canada;2. Materials Science & Engineering Department, University of Washington, USA;1. DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, s/n, 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. CITAB, Universidade de Trás-os-Montes e Alto Douro, Engenharias I, Apartado 1013, 5001-801 Vila Real, Portugal;1. Aviation Group, Israel Aerospace Industries, Ben-Gurion International Airport, Israel;2. Materials Science & Engineering Department, University of Washington, Seattle, USA;3. Aeronautics & Astronautics Department, University of Washington, Seattle, USA;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. Composites Research Network, Departments of Civil Engineering and Materials Engineering, The University of British Columbia, Vancouver, B.C. V6T 1Z4, Canada;2. Composite Vehicle Research Center, Department of Mechanical Engineering, Michigan State University, 2555 Engineering Building, East Lansing, MI 48824, United States
Abstract:This paper describes an experimental investigation into progressive damage development in notched fibre-reinforced composites laminates. The Over-height Compact Tension (OCT) test captures the behaviour of laminates typical of large structures and permits the stable formation of a process zone ahead of the crack tip. This allows a study of the influence of sub-critical damage on progression of fibre failure. A range of lay-ups have been tested using dispersed and blocked plies in the thickness direction. The load vs. pin opening displacement (POD) curve is used to characterise the progressive failure of specimens. A number of interrupted tests were performed for each lay-up to capture the sub-critical damage process before the onset of fibre fracture. Results show that dispersed plies promote fibre failure and crack growth whilst blocked plies promote a larger amount of splitting and delamination which in turn causes a larger process zone and ultimately a tougher laminate.
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