Effect of strain rate on Luders band propagating velocity and Luders strain for annealed mild steel under uniaxial tension

For annealed mild steel that exhibits yield-point phenomena under uniaxial tension, physical equations expressing the strain-rate dependencies of the strain and the Luders-band velocity have been proposed in this work. In these expressions, both the Luders strain and the Luders-band velocity increase with gauge-length strain rate in the form of exponent functions. The proposed equations have been verified by our experimental data of uniaxial tension on mild steels, as well as by those reported by some other researchers. The proposed equations may provide a simple method to determine the stress-rate sensitivity exponent, in the equation of stress-dependent dislocation velocity, which is usually difficult to be measured by experiments. (C) 2003 Elsevier Science B.V. All rights reserved.