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RESEARCH PAPERS

Experiments on Dispersive Pulse Propagation in Laminated Composites and Comparison With Theory

[+] Author and Article Information
J. S. Whittier

Mechanics Research Department, The Aerospace Corporation, El Segundo, Calif.

J. C. Peck

Advance Structures and Mechanical Department, McDonnell Douglas Astronautics Company—Western Division, Santa Monica, Calif.

J. Appl. Mech 36(3), 485-490 (Sep 01, 1969) (6 pages) doi:10.1115/1.3564705 History: Received February 24, 1969; Online September 14, 2011

Abstract

Transient stress-wave experiments on laminated composites are described, and the results are compared with theoretical predictions. The composites are laminated from alternating layers of high and low-modulus material, which cause a high degree of geometric dispersion of waves propagating in the composite. Experiments were conducted in which waves propagated parallel to the laminations. Flat plates were subjected on one face to a uniform pressure with step-function time dependence induced by a gas-dynamic shock wave. Under this loading, the central portion of the specimen initially responds as if it were laterally unbounded. The average velocity over a 3/8 -in-dia area of the backface of the plate was measured with a capacitance gauge. The results are in good agreement with theoretical predictions made with a long-time asymptotic approximation called the head-of-the-pulse approximation. The theory isolates the dominant character of the response and predicts timing and amplitude of oscillations in normalized rear surface velocity within a few percent.

Copyright © 1969 by ASME
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