Low Velocity Transverse Impact Behavior of 8-ply, Graphite-Epoxy Laminates

Author:

Lal K.M.1

Affiliation:

1. NASA Langley Research Center Hampton, Virginia 23665

Abstract

This work discusses the behavior of 8-ply, quasi-isotropic, graphite epoxy laminates subjected to low velocity transverse impact loading. Large deflection theory of plates was used to predict the load-deflection characteristics during the impact event. The im pact model considered that the indentation, flexural and shear stiffnesses could be represented by 3-equivalent springs in series. The analysis of static and dynamic impact loading test-data concluded that the mem brane parameter, β, used in flexural stiffness relation was proportional to the square of the coefficient of restitution, e, of the impactor. Use of β = 0.443 e2 was made in load- deflection relations to consider the drop in plate stiffness due to delamination. The results of impact tests up to impact velocity 5.3 m/sec. were found in close agreement of the predictions.

Publisher

SAGE Publications

Subject

Materials Chemistry,Polymers and Plastics,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

Reference6 articles.

1. "Foreign Objects Damage to Composites," ASTM STP 586, 1976.

2. Spencer, A.J.M. "Deformations of Fibre-Reinforced Materials," Clarendon Press, Oxford, 1972, pp. 10-12.

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