Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Strain Rate Sensitivity of Stress-strain Curves in a Ti-Fe-O Alloy
Hideaki MORIYAKotobu NAGAIYoshikuni KAWABEAtsumasa OKADA
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1996 Volume 82 Issue 10 Pages 876-880


The effect of strain rate on stress-strain curves of an α-type Ti-Fe-O alloy was investigated at the strain rate between 2.8×10-5 to 2.7×10-2 s-1 at 293K. Zero strain rate curve, "Base Curve" was estimated by multiple interrupted crosshead displacement dwell test every 0.02 strain in case of the strain rates of 2.8×10-4 and 2.8×10-5. The relaxation saturated stress-strain points made a single stress-strain curve, "Base Curve". Base Curve and stress-strain curves at various strain rates were parallel. This means the stress-strain curves can be separated into strain dependent component and strain-rate dependent component. When Base Curve is fitted with Swift's equation, the stress-strain curves are interpreted as follows, σ=875.5(0.021+ε)0.176+313.3ε0.046, where σ: Stress(MPa), ε: strain and ε: strain rate.

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