Given two sample of the same copper alloy, with similar UTS, and yield strength.
One sample displays a significanlty lower compressive yield strength.
What processing variables may be responsibel for the reduced compressive strength?
1.Just Difference in yield stress of the SAME material state between tension and compression IS NOT the Baushinger effect ! The latter is lower yield stress in compression AFTER the previous strain in tension (or vice versa). 2) If initial states are the same, yield stresses in tension and compression normally should coincide, although further deformation behaviours may differ. So, pay attention to (difference in) test techniques and related approaches to evaluating the yield stress. On the other hand, the reason may be in the sample prehistory. If, say, the material was pre-deformed in tension, the immediately following tests should display just the Bauschinger effect mentioned first.
...so if one sample was nechanically straightened with a stretching process or flexing process, the Bauschinger effect will likely manifest?
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