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RESEARCH PAPERS

Longitudinal Strain Pulse Propagation in Wide Rectangular Bars: Part 2—Experimental Observations and Comparisons With Theory

[+] Author and Article Information
O. E. Jones

Hydrodynamics Laboratory, California Institute of Technology, Pasadena, Calif.

A. T. Ellis

California Institute of Technology, Pasadena, Calif.

J. Appl. Mech 30(1), 61-69 (Mar 01, 1963) (9 pages) doi:10.1115/1.3630106 History: Received June 12, 1961; Online September 16, 2011

Abstract

The plane-stress theory presented in Part 1 is shown to predict qualitatively the warping of plane sections observed in transient fringe patterns obtained using birefringent coatings and in dynamic photoelastic pictures obtained in other investigations. Measurements using conventional techniques are described in which wide rectangular bars were subjected to a longitudinal step-function pressure loading produced by a shock tube. Comparisons show that the gross features of the experimental records for the head of the pulse are qualitatively predicted by the theory. Both theory and experiment show that short-wavelength, second-mode disturbances arrive very early. Experimentally it is observed that these disturbances are accomplished by thickness-mode activity which cannot be accounted for by the plane-stress theory.

Copyright © 1963 by ASME
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