Figure 13. The calculated dependence of forming limits on R-value using the Marciniak analysis with the high exponent criterion (Equation 8) for n = 0.20 and f = 0.995. The curves for the three R-values are almost identical, suggesting no appreciable dependence of forming limits on R.
 

Figure 13

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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.