Fatigue behavior and modeling of short fiber reinforced polymer composites including anisotropy and temperature effects |
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| Affiliation: | 1. Siemens Industry Software NV, Interleuvenlaan 68, B-3001 Leuven, Belgium;2. Department of Materials Engineering, KU Leuven, Belgium;3. Department of Material Science and Engineering, Ghent University, Belgium;1. Arts et Métiers ParisTech, LEM3 – UMR CNRS 7239, 4 Rue Augustin Fresnel, 57078 Metz, France;2. Arts et Métiers ParisTech, I2M – UMR CNRS 5295, Esplanade des Arts et Métiers, 33405 Talence, France;3. Arts et Métiers ParisTech, PIMM – UMR CNRS 8006, 151 Boulevard de l’Hôpital, 75013 Paris, France;4. Solvay Engineering Plastics, Avenue Ramboz BP 64, 69192 Saint-Fons, France;1. Department of Management and Engineering, University of Padova, Stradella S. Nicola 3, 36100 Vicenza, Italy;2. Robert Bosch GmbH, Corporate Sector Research and Advance Engineering - Plastics Engineering, Robert-Bosch-Campus 1, 71272 Renningen, Germany;1. Department of Management and Engineering, University of Padova, Stradella S. Nicola 3, 36100, Vicenza, Italy;2. Robert Bosch GmbH, Corporate Sector Research and Advance Engineering, Plastics Engineering, Robert-Bosch-Campus 1, 71272, Renningen, Germany;1. Siemens Industry Software NV, Interleuvenlaan 68, B-3001 Leuven, Belgium;2. Department of Materials Engineering, KULeuven, Belgium;3. Department of Material Science and Engineering, Ghent University, Belgium |
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| Abstract: | Effects of anisotropy and temperature on cyclic deformation and fatigue behavior of two short glass fiber reinforced polymer composites were investigated. Fatigue tests were conducted under fully-reversed (R = ?1) and positive stress ratios (R = 0.1 and 0.3) with specimens of different thicknesses, different fiber orientations, and at temperatures of ?40 °C, 23 °C, and 125 °C. In samples with 90° fiber orientation angle, considerable effect of thickness on fatigue strength was observed. Effect of mold flow direction was significant at all temperatures and stress ratios and the Tsai–Hill criterion was used to predict off-axis fatigue strengths. Temperature also greatly influenced fatigue strength and a shift factor of Arrhenius type was developed to correlate fatigue data at various temperatures, independent of the mold flow direction and stress ratio. Micromechanisms of fatigue failure at different temperatures were also investigated. Good correlations between fatigue strength and tensile strength were obtained and a method for obtaining strain–life curves from load-controlled fatigue test data is presented. A fatigue life estimation model is also presented which correlates data for different temperatures, fiber orientations, and stress ratios. |
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| Keywords: | Fatigue Short fiber polymer composite Anisotropy effects Fiber orientation effect Temperature effect |
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