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Accession Number:
AD0882440
Title:
Shock Waves in Cracked Media.
Corporate Author:
NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY
Report Date:
1971-03-01
Abstract:
An experimental investigation has been conducted of the propagation of shock waves through a material having open joints. The purpose of this investigation was twofold first, it was required to evaluate a currently proposed analytical technique for treating cracked media in terms of macroscopic or average response parameters as though it were a continuum and second, should this analytical technique be successful in predicting actual material behavior, then the experiment approach so developed would be used to adapt the available analytical approach to situations which would be very difficult to represent using a purely theoretical approach. The cracked or open jointed material was represented by a 1-inch diameter, 10-foot long segmented aluminum alloy rod having a uniform distribution of joints. Gaps were approximately 6 inches apart and gap widths were varied in six steps from 0.005 inch to 0.125 inch providing initial porosities of 0.084 to 2.07 percent, respectively. Loading was achieved by using a shock tube to apply gas pressure loadings of three different magnitudes--950, 1,900, and 2,850 psi. Measurements of particle velocity and phase velocity were carried out using inductance-type gages and stress levels in the rod were determined using semiconductor strain gages. Author
Descriptive Note:
Technical rept. Feb 69-May 70,
Pages:
0059
Contract Number:
F29601-68-C-0009
File Size:
0.00MB
