Figure 19. The effect of changing strain paths on the forming imits of aluminum alloy 2008-T6. (a) When the material is initially strained in uniaxial tension, the minimum in the forming-limit curve follows a line of constant thinning. (b) For initial straining in biaxial tension, the minimum shifts to higher levels of e2.29
 
19a

Figure 19a

19b

Figure 19b

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This figure is a component of the on-line article "Sheet Metal Forming: A Review", which appears in the November 1999 Issue of JOM.