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Unformatted text preview: EN0175 10 / 26 / 06 Plastic material behavior Yield condition: Y = Plastic loading: Y = , d > P Y 1 E E 1 E Y We will now denote the initial yield stress as Y and the current yield stress as Y ; see above figure. Decompose strain into elastic & plastic parts P E + = In incremental form: E E d d = > = = otherwise , d , if , d d Y P h P h d d = is the tangent modulus of P curve (which is obtained from experiments or fitting an assumed mathematical curve to experimental data). 1 EN0175 10 / 26 / 06 Perfectly plastic: = h P Y Linear work hardening: . const = h P Y 1 h Power law hardening: N Y P Y Y E + = 1 P Y How to generalize this idea to 3D? For elastic part, ij kk ij ij kk ij E ij E K E E E 9 2 1 ' + = + = = P ij E ij ij d d d + = kk ij ij E ij K d...
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