Does strain rate ever decrease yield stress?

  • Thread starter bryony88
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I've been digging through literature the last few days, and I'm starting to wonder if increasing strain rate EVER decreases yield stress? I found anomalies which increase it with increasing temperature. But I cant' find the reverse, so I was wondering if it was possible?
 

Mapes

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Fig. 7c is one example. You'll find many more if you do a search for "yield strength"+"negative strain rate sensitivity".
 

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