Effects of grain strain and strain rate on the flow stress of copper
A study was performed to determine the effects of grain size and deformation rate on the flow stress of OFE copper. Testing was performed in compression at ambient conditions at quasi-static and high strain rates. Testing at different strain rates allowed the dependence of the Hall-Petch parameters on strain rate to be examined. The effect of various crystallographic textures on mechanical behavior was also examined. Findings of the study are as follows: Decrease in grain size caused an increase in flow stress. The observed dependence of flow stress on grain size was found to be consistent with the Hall-Petch relation. Results of the study suggest that strain rate does not have an influence on the proportional relationship between flow stress and grain size, i.e., the Hall-Petch parameter kepsilon is not strain-rate dependent. Crystallographic texture had no discernible effect on stress-strain response at high strain rates.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6896393
- Report Number(s):
- UCID-21450; ON: DE88016112
- Resource Relation:
- Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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