The Development and Use of a Torsional Split Hopkinson Bar for Experiments in Dynamic Plasticity.
Summary technical rept. Sep 69-Dec 70,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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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 1000sec. 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
- Test Facilities, Equipment and Methods