Behaviour of Fibre-Reinforced Composites under Dynamic Loading
Final rept. 1 May-14 Nov 86
OXFORD UNIV (UNITED KINGDOM) DEPT OF ENGINEERING SCIENCE
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Stress-strain curves are presented for tensile impact tests on plain-weave glssepoxy and plain-weave carbonepoxy laminates loaded in a direction at 45 deg to both the warp and weft directions. From the initial linear-elastic response the in-plane shear moduli for the two types of reinforcement at impact rates of strain are derived. In conjunction with results previously obtained from tensile impact tests on the same laminates loaded in the warp and the weft directions, two-dimensional stiffness matrices for both the glass-fabric and the carbon-fabric reinforced plies are determined. When compared with similar stiffness matrices previously obtained under quasi-static loading a marked effect of strain rate is apparent, particularly for the glass-reinforced ply. Keywords Fibre reinforced composites, Tensile impact testing, Hopkinson-bar.
- Laminates and Composite Materials