| Popis: |
One of the main downsides of fiber reinforced polymer composite laminates is their susceptibility to impact damage. Many different methods have been devised to either modify or engineer the composites to improve their impact resistance and tolerance. In this chapter, three types of engineered composites and their impact performances are presented and discussed. The engineered composites are (i) composites with core–shell polymer particles, (ii) composites with carbon nanotubes/nanofibers and (iii) composites with thermoplastic film interleaves. Core–shell polymer particles absorb large amounts of energy during impact, thus limit the damage done to the composite laminate. Carbon nanotubes and nanofibers have excellent stiffness and strength, making them suitable for reinforcing the interlaminar regions of composite laminates, leading to improved impact resistance. For composites with thermoplastic film interleaves, thermoplastic films with high intrinsic toughness modify the interlaminar regions of the composite laminate and enhance the overall toughness. The three types of engineered composites exhibit varying levels of improved impact performances compared to the unmodified composites. For each type of engineered composite, its impact response, the strengthening mechanisms and factors affecting its impact performance are deliberated. |
