Orientation-dependent compression/tension asymmetry of short glass fiber reinforced polypropylene: Deformation,damage and failure |
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| Affiliation: | 1. Institute of Polymeric Materials and Testing, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria;2. Borealis Polyolefine GmbH, St.-Peter Str. 25, 4021 Linz, Austria;1. Department of Mechanical Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran;2. Department of Mechanical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran;3. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA;1. Department of Mechanical Engineering Sciences, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom;2. School of Materials, University of Manchester, Manchester M13 9PL, United Kingdom;3. Dipartimento di Tecnica e Gestione dei Sistemi Industriali, Università degli Studi di Padova, Stradella S. Nicola 3, I-36100 Vicenza, Italy;4. Gazi University, Faculty of Engineering, Department of Mechanical Engineering, Maltepe, 06570 Ankara, Turkey;5. College of Textiles, North Carolina State University, 1000 Main Campus Dr. Raleigh, NC 27695, USA;1. Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Germany;2. Institute of Continuum Mechanics and Material Mechanics, Hamburg University of Technology, Germany;3. Department of Civil, Environmental and Geo-Engineering, University of Minnesota, 500 Pillsbury Drive S.E., Minneapolis, MN 55455, USA |
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| Abstract: | Short glass fiber reinforced polypropylene (sgf-PP) is increasingly employed in structural components which are subjected to a variety of loading conditions including tensile, compressive and bending loading modes. Since typical industrial components exhibit a wide range of fiber orientation distributions, their mechanical response to these loading conditions is also highly anisotropic. In this paper, the compression/tension asymmetry in the stress–strain behavior of sgf-PP is investigated from a macroscopic engineering and a micro-mechanisms of deformation and failure point of view for specimens with varying, precisely defined fiber orientations. Furthermore, we performed volume strain measurements and two-cyclic tests. We used the results to deduce the onset of damage due to cavitational mechanisms under tension and compared this to the onset of deviation of the tensile from the compressive stress–strain behavior. The results showed a good correlation for specimens with high fiber orientation, whereas for specimens with low fiber orientation results deviate due to the high deviatoric matrix volume strain contribution. |
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| Keywords: | A Discontinuous reinforcement B Anisotropy D Mechanical testing Compression/tension asymmetry |
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