Interpreting the stress ratio effect on delamination growth in composite laminates using the concept of fatigue fracture toughness |
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| Affiliation: | 1. Department of Astronautics Science and Mechanics, Harbin Institute of Technology, Harbin, PR China;2. School of Civil Aviation, Northwestern Polytechnical University, Xi’an, PR China;1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;2. Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China;3. Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400044, China;4. Bristol Composites Institute (ACCIS), University of Bristol, Queen’s Building, University Walk, Bristol BS8 1TR, UK;5. School of Astronautics, Beihang University, Beijing 100191, China;6. Department of Civil Engineering, University of Siegen, Siegen D-57068, Germany;1. Department of Mechanical Engineering, International Islamic University, Islamabad, Pakistan;2. Faculty of Aerospace Engineering, Technical University, Delft, Netherland;1. Department of Astronautics Science and Mechanics, Harbin Institute of Technology, Harbin, PR China;2. School of Aerospace, Transport and Manufacturing, Cranfield University, United Kingdom;3. Structural Integrity and Composites Group, Faculty of Aerospace Engineering, Delft University of Technology, The Netherlands |
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| Abstract: | This paper provides a study on fatigue delamination growth in composite laminates using energy principles. Experimental data has been obtained from fatigue tests conducted on Double Cantilever Beam (DCB) specimens at various stress ratios. A concept of fatigue fracture toughness is proposed to interpret the stress ratio effect in crack growth. The fatigue fracture toughness is demonstrated to be interface configuration independent but significantly stress ratio dependent. An explanation for this phenomenon is given using SEM fractography. Fracture surface roughness is observed to be similar in different interfaces at the same stress ratio. But it is obviously more rough for high stress ratio in comparison with that for low stress ratio, causing the fatigue resistance increase. Therefore, the stress ratio effect in fatigue crack growth can be physically explained by a difference in resistance to crack growth. |
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| Keywords: | B Fatigue B Delamination B Fracture toughness Energy principles |
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