A Constitutive Equation for Carbon Steels in Wide Range of Strain Rates
1985 Volume 34 Issue 387 Pages 1400-1405
Details
1985 Volume 34 Issue 387 Pages 1400-1405
A constitutive equation dependent on the strain rate was proposed and was applied to carbon steels. It was derived from the approximation of two different dislocation movements, that is, one being dominant at low strain rates and the other at high strain rates.
Compressive tests for four carbon steels (0.19%C, 0.37%C, 0.45%C and 0.57%C) were conducted under various constant strain rates ranging from 10-4 to 1000/sec by using three types of testing machine. Stepped strain-rate tests were also conducted to obtain the correction factor of the strain rate hysteresis effect on the stress-strain relation.
The present constitutive equation was applied to the measured stress-strain relations. As a result, it agreed well with the experimental values. The experimental constants included in the equation were found to be determinable from a comparatively small number of experiments. So, the present constitutive equation seems to be valid for practical use.
