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Updated: May 18, 2026

Intermediate Strain Rate Material Characterization with Digital Image Correlation
Published on: March 1, 2019
Onset mechanism of strain-rate-induced flow stress upturn
Yue Fan1, Yuri N Osetsky, Sidney Yip
1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Abstract:
The strain-rate response of flow stress in a plastically deforming crystal is formulated through a stress-sensitive dislocation mobility model that can be evaluated by atomistic simulation. For the flow stress of a model crystal of bcc Fe containing a 1/2[111] screw dislocation, this approach describes naturally a non-Arrhenius upturn at high strain rate, an experimentally established transitional behavior for which the underlying mechanism has not been clarified. Implications of our findings regarding the previous explanations of strain-rate effects on flow stress are discussed.
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