Impact Strength and Toughness of Fiber Composite Materials.
Final rept. 1 Nov 71-31 Oct 76,
ILLINOIS INST OF TECH CHICAGO DEPT OF METALLURGICAL AND MATERIALS ENGINEERING
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Specimens in the shape of rectangular cross section beams were prepared and tested. The following variables have been studied Specimen geometry, Impact velocity, Effect of notch, and Orientation of lamination planes with respect to impact load. The failure was observed using a high speed movie camera and the movies were analyzed to determine and create a model of the fracture process. The studies had shown that glass fiber reinforced epoxies are rate sensitive when an impact load is applied to them. The mechanism of oaborbind energy is delamination between layers and between fibers, thus, the type of glass fiber does not change the toughness of the material. It was found that the orientation of the lamination plies with respect to the impact load direction will have a great influence on the mode of fracture and energy absorption. The studies with the carbon fiber composites reveal the brittle nature of this material, particularly when compared to the glass fiber composites. Additional research was accomplished in four general areas Impact property study of angle-ply laminates, Optimization of impact properties of hybrid composites, Effect of Interface strength of impact of glass fiber laminates, and Study of energy absorbing mechanisms in glass fiber composites.
- Laminates and Composite Materials