SEDL / STP / STP647-EB / STP30056S

Analysis of Sheet Metal Forming to Axisymmetric Shapes

Levy, S
Consultant, mechanical engineer, and manager, General Electric Company, Schenectady, NY

Shih, CF
Consultant, mechanical engineer, and manager, General Electric Company, Schenectady, NY

Wilkinson, JPD
Consultant, mechanical engineer, and manager, General Electric Company, Schenectady, NY

Stine, P
Senior research metallurgist and program manager, Stress and Vibration, General Electric Major Appliance Laboratories, Louisville, Ky

McWilson, RC
Senior research metallurgist and program manager, Stress and Vibration, General Electric Major Appliance Laboratories, Louisville, Ky

Pages: 23    Published: Jul 1978

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Abstract

The objective of this study was to develop an analytical method of predicting the stress and strain distribution in a metal sheet formed into a cup or other axially symmetric geometry. The analysis is done using the finite element method based on the deformation theory of plasticity; the elastoplastic computations account for the large deformation associated with sheet forming operations. The theory behind the computer program is discussed in detail. Examples are given of the strain distributions induced in cups drawn to depths comparable with their diameters. The results also give the stresses, thickness changes, and forming force required. Some comparisons between the calculated and measured strains are discussed, and they show good agreement.