Combined Tension-Torsion Impact Testing Apparatus and an Experimental Study in the Incremental Wave Propagation

抄録

Through a theoretical study on the general constitutive equation for an elastic/viscoplastic/plastic body, the experimental methods to examine the existence of the instantaneous plastic property and to obtain directly a practical form of the general equation are given. Combined tension-torsion impact testing apparatus with special mechanics was designed which could apply a combined stress pulse with a very short rise time, about 15 μs, to a thin walled tube. In an experiment of the incremental torsional impact to commercial pure aluminum and copper specimens, the analogous phenomena to the instantaneous plastic response were observed for both materials.