Effects of Impact Loading Rate on the Delamination Behavior of Composite Laminates

Title & Authors
Effects of Impact Loading Rate on the Delamination Behavior of Composite Laminates
Choe, Nak-Sam;

Abstract
The delamination behavior of multidirectional carbon-fiber/epoxy composite laminates under 10NA intermediate and high rates of test, up to rate of about 11.4m s has been investigated using the double cantilever beam specimens. The mode I loading under rates above l.0m/s showed considerable dynamic effects on the load-time curves and thus higher values of the average crack velocity than that expected from a simple proportional relationship with the test rate. The modified beam analysis utilizing only the opening displacement and crack length exhibited an effective means for evaluating the dynamic fracture energy $\small{G_{IC}}$. Based on the assumption of constant flexural modulus, values of $\small{G_{IC}}$ at the crack initiation and arrest were decreased with an increase of the test rate up to 5.7m/s, but the maximum $\small{G_{IC}}$ was increased at 11.4m/s.
Keywords
Impact Test Under Low and High Rates;Multidirectional Laminates;Mode I Delamination;Modified Beam Analysis;Fracture Energy;Crack Velocity;Crack Jumping;
Language
Korean
Cited by
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