Transactions of Nanjing University of Aeronautics & Astronautics
Experimental Investigation on Low-Velocity Impact Response and Residual Compressive Bearing Capacity of Composite Stringers
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Abstract:
Three types of composite stringers were impacted from two different directions. Relationships between impact energy and visible defect length were found. The critical impact energy corresponding to barely visible impact damage (BVID) of each stringer was determined. Specimens with BVID were then compressed to obtain the residual strength. Experimental results showed that for all types of stringers, the critical energy of in-plane impact is always much lower than out-plane ones. In-plane impact causes much more decrement of stringers’ bearing capacity than out-plane impact. For both impact directions, I-stringers own the highest defect detectability, T-stringers come second. Meanwhile, T-stringers own the better residual strength ratio than I-stringers and J-stringers. Synthetic considering impact defect detectability and residual bearing capacity after impact, T-stringers own the best compression-after-impact (CAI) behaviors.
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V258
CHINA AERO-SCIENCES
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