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The strain gradient approach is incorporated into the M-K method for the deformation localization analysis and the prediction of the forming limit diagram (FLD) during sheet metal forming. This approach introduces an internal length scale into conventional constitutive equations and takes into account the effects of deformation inhomogeneity. It thus overcomes the imperfection sensitivity encountered in the conventional M-K method. The comparison between experimental and theoretical results for FLDs as predicted by different methods, indicates that the present approach is most suitable for these problems.The Strain Gradient Approach for Deformation Localization deformation states close to plane strain condition but overestimates it in the region near equi-biaxial stretching (εj = εImprovements to the M-K approach have been made in order to obtain better agreement with

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