The circular grid system, in which a pattern of 0.05-0.25 in. diameter circles electrochemically marked on sheet specimens is used, permits a visual display of the magnitude and direction of the strain from point-to-point of a stamping. Strain values obtained from the grid are plotted relative to an empirical failure curve to indicate proximity of a stamping to failure. Analysis of the strain distribution allows one to reduce the die tryout period, assist in establishing material specifications, evaluate die modifications, and monitor die variables throughout production runs.
Circular Grid System — A Valuable Aid for Evaluating Sheet Metal Formability
Sae Technical Papers
1968 Automotive Engineering Congress and Exposition ; 1968
1968-02-01
Conference paper
English
Metals , Logistics , Production , Stamping
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