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Published October 1964 | Published
Journal Article Open

Machine for Producing Square Torsion Pulses of Microsecond Duration


A dynamic torsion testing machine has been built for the purpose of applying a known constant shear stress to a 12.7-mm-diam cylindrical test specimen for very short periods of time. The shear stress at the surface of the specimen rises from zero to any desired value in the range 0 to 3000 psi, within a period of 4 to 6 μsec. The time at constant stress varies linearly with axial position from the free end of the specimen ranging from 0 to about 500 μsec. The stress is removed within a period of 4 to 6 μsec and for short specimens it remains essentially zero thereafter. This machine has been developed for the measurement of dislocation velocities up to 25 m/sec in metal single crystals.

Additional Information

© 1964 American Institute of Physics. Received 14 April 1964; and in final form, 16 June 1964. This work was sponsored by the U. S. Atomic Energy Commission, Contract No. AT(04-3)-473. The authors wish to thank R. C. Blish of California Institute of Technology for valuable help in the laboratory, G. J. Woffinden and R. R. Randall of Aerojet General Corporation, Downey, California, for assistance in designing and constructing the capacitor discharge circuit, and Dr. Donald S. Clark of California Institute of Technology for constructive criticisms of the manuscript.

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August 19, 2023
October 23, 2023