Accession Number:

ADA191310

Title:

Behaviour of Fibre-Reinforced Composites under Dynamic Loading

Descriptive Note:

Final rept. 1 May-14 Nov 86

Corporate Author:

OXFORD UNIV (UNITED KINGDOM) DEPT OF ENGINEERING SCIENCE

Personal Author(s):

• Saka, K.
• Li, R. K.
• Harding, J.

Report Date:

1987-10-30

Pagination or Media Count:

78.0

Abstract:

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.

Descriptors:

• *FIBER REINFORCED COMPOSITES
• *EPOXY LAMINATES
• *DYNAMIC LOADS
• *CARBON REINFORCED COMPOSITES
• TEST AND EVALUATION
• STRESS STRAIN RELATIONS
• LAMINATES
• MATRICES(MATHEMATICS)
• IMPACT TESTS
• STATIC LOADS
• STIFFNESS
• TENSILE PROPERTIES
• ELASTIC PROPERTIES
• STRAIN RATE
• FAILURE(MECHANICS)
• TENSILE TESTERS

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE