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- W2008612064 abstract "The heading process of a circular bar under various frictional conditions is analyzed numerically by the use of the elastic-plastic finite element method. The conventional J2-flow theory is used as the constitutive equation. The laws of Coulomb friction and the constant frictional shearing stress are adopted as the frictional conditions. The effect of the geometrical nonlinearity on the so-called folding phenomenon is clarified. The influence of the frictional conditions on the flow pattern, the stress and the strain distributions, the hydrostatic stress distribution, and the pressure distribution along the tool surface are discussed. The die-forging process of a gear blank with no friction is also analyzed. The initial blanks are circular bars of six different aspect ratios (height/diameter). It follows that the blocks of larger aspect ratios experience more severe strain around the corner parts and thus require remeshing of the finite elements more than one, which means that some difficulty may occur in the actual process as well. Furthermore, defects of overlapping in the inner boss part occur inevitably when the initial aspect ratio exceed a certain value. This is the worst case. It is concluded that there may exist an optimum initial aspect ratio of the material, if we consider the convenience of the croppinf process of the initial blanks from the source bar. The case where a hallow blank is used is also analyzed to confirm that it deforms far more smoothly than the solid blanks, though the cropping process may require a higher technique in this case." @default.
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- W2008612064 date "1991-08-01" @default.
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- W2008612064 title "Elastic-plastic FEM analysis of the heading process and the die-forging process of a gear blank" @default.
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- W2008612064 doi "https://doi.org/10.1016/0924-0136(91)90053-h" @default.
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