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Energy Absorption Performance of 3D Woven Composites in Crushing

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Energy Absorption Performance of 3D Woven Composites in Crushing

 

Due the presence of through-thickness reinforcement which eliminates delamination, 3D woven composites have superior fracture toughness, fatigue life, and damage tolerance compared to laminated composites. Unlike 2D laminated composites which exhibit catastrophic failure typically through delamination, 3D woven composites exhibit a progressive damage behavior that leads to high specific energy absorption (SEA). Thus, enabling the manufacture of reduced weight structural components for energy absorption compared to traditional materials such as laminated composites or high strength metals. This is of particular importance for automotive applications, where weight reduction is sought through material change in vehicle components that play a critical role in crashworthiness. The rate dependent nature of these materials, however, is not well understood. The goal of this study was to experimentally compare the SEA of various 3D woven and 2D laminated composites manufactured with identical carbon fiber and resin that were tested under quasi-static and various dynamic crushing loads. In general, 3D woven composites were found to have higher SEA measures than 2D laminates, and orthogonal fiber topologies were found to have higher values than ply-to-ply interlocking configurations.  All specimens tested displayed substantially reduced SEA for higher velocity impacts. Micro-computed tomography scans of tested samples were used to gain insight into energy absorption mechanisms in 3D woven composites. Finally, resin toughening was found to have a significant impact on SEA performance.

 

Author: Harun Bayraktar

 

Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0880

Pages: 12





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