Post-Impact Fatigue Behavior of Woven and Knitted Fabric CFRP Laminates for Marine Use
In this study, the damage evolution behavior was evaluated. Damage observation was conducted by the integration of non-destructive and direct observation methods. Target reinforcements were T300-3k plain woven fabric (PW) and T700S-12k multi-axial knitted fabric (MA). Impact damage distribution in the CFRP laminate was observed precisely, and three-dimensional damage model was constructed. Compression after impact (CAI) and post impact fatigue (PIF) performances were evaluated. The effect of water absorption on these performances was also evaluated. The effect of water absorption on CAI and PIF performances were small in PW CFRP laminates. Conversely, PIF properties of water-absorbed MA drastically decreased than that of dry ones. CAI strength was not affected by water absorption. PIF performance of dry MA CFRP was fairly higher than that of the others. From the precise observation, some evidences of interfacial deterioration caused by water absorption were confirmed in both PW and MA CFRP laminates.
KeywordsFiber Bundle Damage Evolution Impact Point Transverse Crack Impact Damage
The authors thank the Office of Naval Research for supporting this work through an ONR award (N000140110949) with Dr. Yapa Rajapakse as the program manager of solid mechanics. The authors thank Professor Richard Christensen at Stanford University as the consultant of this project and Toray Industries, Inc. as the supplier of CFRP laminates.
All of experimental data were measured by the graduate students of author's laboratory, in Kanazawa Institute of Technology. The authors thank these graduate students, Mr. Teppei Kimura and Norihiko Ikeda.
- 2.TECABS general presentation:5th Framework Programme of European Community for RTD and Demonstration Activities (1998–2002). (http://www.tecabs.org/).
- 6.Lauder AJ, Amateau MF, Queeney RA (1993) Fatigue resistance of impact damaged specimen vs. machined hole specimens. Composites 24:443–445.Google Scholar
- 31.Matsuda S, Hojo M, Ochiai S (1999) Effect of water environment on Mode II delamination fatigue in interlayer-toughened CFRP. JSME Int J 42(3):421–428.Google Scholar