Strain-rate And Strain-rate-history Effects In Several Metals In Torsion

Author:  Nicholas, T.
Source:  SESA, Vol. XXVIII, No. 2
Doc ID:  1971016
Year of Publication:  1971
Abstract:  
A machine for testing thin-walled tubes in torsion at shear-strain rates up to 25/sec is described. Results of constant and variable strain rate tests are pesented for 1100-0 aluminum, AISI 1020 steel and 50-A titanium. Results indicate that 1100-0 aluminum is very slightly strain rate sensitive, but steel and titanium are noticeabely sensitive to both strain rate and strain rate history. Variable rate tests show that subsequent dynamic loading on a statically prestrained specimen causes an increase in the flow stress in steel and a decrease in the flow stress in titanium.