Xy. Hu et al., THE EFFECT OF INERTIA ON TENSILE DUCTILITY, Metallurgical and materials transactions. A, Physical metallurgy andmaterials science, 25(12), 1994, pp. 2723-2735
One-dimensional numerical simulations of dynamic tensile tests have be
en carried out over a wide range of test velocities for materials havi
ng a Hollomon-type constitutive law with power-law strain-rate sensiti
vity. A variety of values of the strain-hardening exponent and strain-
rate-sensitivity index have been used to analyze the effect of inertia
on tensile ductility. Results show that the total elongation of the s
pecimen is enhanced by inertia at high test velocities. This inertial
effect varies with the strain-hardening exponent and strain-rate-sensi
tivity index and can be scaled with the normalized material density an
d the test velocity. Based on these results, the critical test velocit
y for the onset of the inertial effect as a function of material param
eters has been numerically determined. To account for the effect of in
ertia on the enhancement of tensile ductility, a simple phenomenologic
al explanation has been proposed.