Mechanisms of stress transfer and interface integrity in carbon/epoxy composites under compression loading: Part I: Experimental investigation |
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| Affiliation: | 1. Institute of Chemical Engineering and High Temperature Chemical Processes Foundation of Research and Technology––Hellas, P.O. Box 1414, Patras 265 00, Greece;2. Materials Department, Queen Mary University of London Mile End Road, London E1 4NS, UK;3. Eindhoven Polymer Laboratories, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;1. Department of Engineering Mechanics, Applied Mechanics Lab, Tsinghua University, Beijing 100084, China;2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. Department of Chemistry, Government College Kottayam, Nattakom P.O., Kottayam, Kerala 686013, India;2. Centre for Nanoscience and Nanotechnology, School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam, Kerala 686560, India;3. Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Cochin 682022, Kerala, India;4. Corporate Research and Development Centre, HLL Lifecare Ltd., Akkulam, Sreekariyam P.O., Thiruvananthapuram 695017, India;5. Department of Polymer Engineering, Budapest University of Technology and Economics, Mûegyetem rkp. 3., H-1111, Budapest, Hungary |
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| Abstract: | Raman spectroscopy is used to get an insight into the microstructural aspects of the compressional behavior of carbon fiber composites. This is done by a comparative assessment of the stress transfer efficiency in tension and compression in single-fiber discontinuous model geometries. It was found that axial stress is transferred in the fiber through the generation of shear stresses at the interface for both tension and compression loading. Experimental evidence is presented to verify that the values of the maximum interfacial shear stress that the system sustains is a function of the applied strain and independent of the type of loading. However, compressive failure is quite different as fiber fragments remain in contact, thus can still bear load. |
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