Shock Waves in Cracked Media.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1971
- Accession Number
- AD0882440
Entities
People
- James B. Forrest
Organizations
- University of New Mexico