The effect of ductile innerlayers on the mechanical performance of fiber-reinforced composite materials
The effects of ductile innerlayers on the mechanical behavior of unidirectional fiber reinforced composites were studied. Two fiber systems were used as the reinforcement; a monofilament system and a roving system. The ductile innerlayer materials were applied on fiber surfaces using coating equipment that was first designed for monofilament coating. For composites reinforced by rovings, problems such as nonuniform fiber distribution and resin starvation in spaces between closely packed filaments arise from the coating process. Even with these problems, improvement in transverse tensile strength, longitudinal compressive strength, flexural fatigue resistance, and fatigue endurance limit were achieved. For monofilament systems, properties such as flexural strength, interlaminar shear strength, and transverse tensile strength are improved by the application of ductile innerlayers. Three mechanisms were shown to be responsible for the improvements: by acting as a spacer and preventing fiber-fiber contact; local ductility is provided near the fiber-matrix interface and lowering stress concentrations; and healing surface flaws in large diameter fiber systems, thus increasing fiber strength.
- Research Organization:
- Washington Univ., Seattle, WA (United States)
- OSTI ID:
- 5235183
- Country of Publication:
- United States
- Language:
- English
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