Low velocity impact performance of recyclable all-polypropylene composites |
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Affiliation: | 1. William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Guggenheim Hall, Seattle, Washington 98195-2400, USA;2. Department of Materials Science and Engineering, University of Washington, Roberts Hall, Seattle, Washington 98195-2400, USA;3. Composite Recycling Technology Center, 2220 W 18th St, Port Angeles, Washington 98363-1521, USA |
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Abstract: | Highly oriented polypropylene (PP) tapes, with high tensile strength and stiffness achieved by molecular orientation during solid state drawing are consolidated to create high performance recyclable “all-polypropylene” (all-PP) composites. These composites possess a large temperature processing window (>30 °C) and a high volume fraction of highly oriented PP (>90%). This large processing window is achieved by using co-extruded, highly drawn PP tapes. This paper investigates the impact resistance of these all-PP composites, and the relationship between penetrative and non-penetrative impact behaviour, and composite consolidation conditions. The response of all-PP composites to falling weight impact is reported together with a comparison to conventional commercial glass reinforced polypropylene composites. A model for energy absorption is proposed by comparison with previous studies based on interfacial and tensile failure of tapes and composites. |
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