Quote:
Originally Posted by LubeMaster77
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So, answer me this students-o-failure, why would the color be dark on the inside and not on the outside? How do you think the stress developed?
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You can't assume that the material was isotropic when made. (cold-drawn?) And, strain-hardening (outer perimeter) can come from heavy flexing.
So, in engineering terms; Like a Ho-Ho ... hard chocolate outside, and a creamy/cakey filling inside.