Stretchability of Prior Cold Worked AISI Type 304 Stainless Steel Sheet.
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"Stretchability of Prior Cold Worked..." refers methods in this paper
...Treating martensite as inclusions embedded in an austenite matrix, the equations relate the strain rate experienced by the martensite and the strain imposed on the austenite and are given by [30, 31]:...
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...The additional relation required to uniquely determine the four rate quantities is obtained using Eshelby’s results [30]....
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"Stretchability of Prior Cold Worked..." refers background in this paper
...The relation for incremental equivalent strain is given below [34]:...
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...Such a representation is due to the normality flow rule and is equivalent to specifying the limits in the principal stress space with the advantage that the constitutive equivalent stress–equivalent strain relation need not be known [7, 34]....
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...In determining the equivalent strains, it is assumed that the material is isotropic and obeys Hill’s quadratic yield surface [34] and that the material is subject to linear strain paths during rolling and stretching....
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...Assuming the von Mises criterion for the two-phase mixture to hold, the equivalent stress σ̄ is [34]:...
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"Stretchability of Prior Cold Worked..." refers background in this paper
...The onset of flow instability depends on the instantaneous strain hardening rate, enhancing which, can postpone the onset of necking [1, 2]....
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...It is known that enhancing strain hardening suppresses flow localization and, as a consequence, significantly improves stretchability of the sheet material [1, 2, 12, 42]....
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...Hill [1], assuming a convex yield surface and the normality flow rule, predicts the conditions under which a velocity discontinuity occurs at zero and negative minor strain....
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