Impact-Induced Delaminations in Thermoset and Thermoplastic Composites
Laminated fiber-reinforced composites are engineering materials with many desirable properties including high stiffness and strength. However, the lack of fiber reinforcement in the through-thickness direction makes composite laminates vulnerable to foreign object impact loading. Transverse impact loading can lead to a variety of damages including matrix cracking, delamination and fiber breakage. Delaminations can reduce the strength of a laminate, especially the compressive strength after impact. Impact loading typically causes multiple delaminations that vary in size and shape by depth location. The fracture behavior of impact damages has been a topic of extensive research . Recently significant advances have been made in the area of nondestructive evaluation (NDE) of impact damages in composites. For example, ultrasound is used to map out the details of impact-induced delaminations with ply-by-ply resolution .
KeywordsComposite Laminate Impact Resistance Damage Area Impact Damage Fiber Breakage
Unable to display preview. Download preview PDF.
- 1.L. B. Greszczuk ed., “Foreign object impact damage to composites”, ASTM, STP 568, 1975.Google Scholar
- 2.C. F. Buynak, T. J. Moran and S. Donaldson, “Characterization of impact damage in composites”, SAMPE Journal, Mar/Apr 1988. pp. 35–39.Google Scholar
- 3.S. M. Freeman, Composites in Manufacturing 3 Conference, Vol. EM84-101, 1–3, Society of Manufacturing Engineers, Dearborn, Michigan, 1984.Google Scholar
- 4.M. Kitanaka, H. Kobayashi, T. Norita and Y. Kawatsu, “Damage tolerance of thermoplastic/graphite fiber composites”, ICCM ‘85, pp. 913–929.Google Scholar