Measurement and analysis of three 1.5-GPa shock-wave profiles in copper
Three wave-profile experiments were performed on OFE fully annealed (600{degree}C for one hour) copper using a 101.6-mm-diam gas gun at impact velocities of 86 m/s. A symmetric impact produced a 1.5-GPa shock wave in the target. A sapphire window was bonded to the front (non-impact) face of the target, and a four-detector push-pull velocity interferometer (VISAR) measured the velocity of the copper/sapphire interface. The impactor thickness (4 mm) was the same in all experiments, the target thicknesses were 10, 20, and 30 mm. The stresses and strains, including the deviatoric stresses and strains, have been extracted from these data using a quasi-Lagrangian analysis. (The waves are not steady.) The use of three separate shots in Lagrangian analysis yields only approximate results for the deviatoric stresses; but the results for the normal stresses, and for the strains, are fairly accurate. Even though the strain rates fall in the Hopkinson bar regime, the mechanism of dislocation motion appears to be dislocation drag, as is the case for stronger shock waves in Cu.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10165834
- Report Number(s):
- LA-UR-93-2276; CONF-9306167-10; ON: DE93016559; TRN: 93:016582
- Resource Relation:
- Conference: 14. international conference on high pressure science and technology and 1993 technical meeting of the topical group on shock compression of condensed matter,Colorado Springs, CO (United States),28 Jun - 3 Jul 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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