| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Mechanism of Strain Rate Effect Based on Dislocation Theory |
| QIN Kun1,2, YANG Li-Ming2, HU Shi-Sheng1 |
| 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 2300272Mechanics and Materials Science Research Centre, Faculty of Engineering, Ningbo University, Ningbo 315211 |
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| Cite this article: |
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QIN Kun, YANG Li-Ming, HU Shi-Sheng 2009 Chin. Phys. Lett. 26 036103 |
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Abstract Based on dislocation theory, we investigate the mechanism of strain rate effect. Strain rate effect and dislocation motion are bridged by Orowan's relationship, and the stress dependence of dislocation velocity is considered as the dynamics relationship of dislocation motion. The mechanism of strain rate effect is then investigated qualitatively by using these two relationships although the kinematics relationship of dislocation motion is absent due to complicated styles of dislocation motion. The process of strain rate effect is interpreted and some details of strain rate effect are adequately discussed. The present analyses agree with the existing experimental results. Based on the analyses, we propose that strain rate criteria rather than stress criteria should be satisfied when a metal is fully yielded at a given strain rate.
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| Keywords:
61.50.Ah
61.72.Bb
62.20.-x
62.20.Fq
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Received: 06 May 2008
Published: 19 February 2009
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| PACS: |
61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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61.72.Bb
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(Theories and models of crystal defects)
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62.20.-x
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(Mechanical properties of solids)
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62.20.fq
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(Plasticity and superplasticity)
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