On the investigation of the biaxial fatigue behaviour of unidirectional composites |
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| Affiliation: | 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. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;2. The Sixtieth Institute of the Headquarters of General Staff, Nanjing 210016, PR China;3. Nanjing Fiberglass R & D Institute, Nanjing 210012, PR China;4. Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, UK;1. Center for Composite Materials, Harbin Institute of Technology, Harbin, China;2. School of Engineering, Cardiff University, Cardiff, UK |
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| Abstract: | The paper illustrates the preliminary activity of an extensive research program oriented to investigate the multiaxial fatigue behaviour of unidirectional composite laminates, with particular attention to the analysis of the damage mechanisms and their correlation with the local multiaxial stress state to be used then as the basis for the development of multiaxial fatigue criterion. The definition of an effective experimental procedure for multiaxial fatigue testing is carefully discussed in terms of specimen geometry, specimen manufacturing and local stress state. Once identified in the thin-walled tubular specimens under tension–torsion loading the best test configuration for the aims of the research, the results of comparative fatigue tests investigating the influence of the tubes geometry (wall thickness to diameter ratio) on the transverse fatigue response are presented. In the final part of the paper the effects of an increasing shear stress component (σ6) on the transverse (σ2) fatigue strength and damage evolution in UD glass–epoxy tubes are illustrated. |
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| Keywords: | A Lamina/ply B Fatigue C Damage mechanics D Mechanical testing Multiaxial fatigue |
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