The Development and Use of a Torsional Split Hopkinson Bar for Experiments in Dynamic Plasticity.
Abstract
The development and use of a torsional split-Hopkinson bar testing apparatus for determining the mechanical properties of materials at high rates of strain is described. The apparatus is capable of generating a smooth torsional pulse with a rise-time of approximately 20 microseconds and can be used to generate shear stress-strain data at strain rates above 1000/sec. Experimental data are presented for an aluminum alloy. Results of incremental wave propagation tests on quasistatically prestressed specimens of an essentially 'rate-independent' metal indicate that the velocity of propagation of the wave front is that of an elastic shear wave which is in agreement with the rate-dependent theory of plastic wave propagation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1971
- Accession Number
- AD0726998
Entities
People
- J. D. E. Campbell
- Theodore Nicholas
Organizations
- Air Force Research Laboratory