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# 11.2: Loading/Unloading Condition


In the 1-D case the plastic flow rule is reduced to the following statement:

$\dot{\epsilon}^p > 0 \quad \sigma = \sigma_o$

$\dot{\epsilon}^p < 0 \quad \sigma = −\sigma_o$

$\dot{\epsilon}^p = 0 \quad \sigma_o < \sigma < −\sigma_o$

In the case of unloading, the stress follow the path CD on the $$\sigma-\epsilon^p$$ graph. If the strain rate is an independent variable, the path of all unloading cases is the same CBO, as shown in Figure ($$\PageIndex{1}$$)

This page titled 11.2: Loading/Unloading Condition is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Tomasz Wierzbicki (MIT OpenCourseWare) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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