AN INVESTIGATION OF THE NATURE OF STRUCTURAL DAMAGE IN METAL-FORMING PROCESSES.
Progress rept. no. 4, 18 Dec 63-17 Feb 64,
GENERAL ELECTRIC CO SCHENECTADY N Y
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Strain gages were applied to the sheet-drawing die holder and to the tension weighbars, and the load-deflection characteristics of each of these units was established through calibrating procedures utilizing a tensile testing machine. Instrumentation had to be assembed for this purpose, and some trouble was encountered, but finally overcome, in phase balacing the measuring circuits in the alternating-current bridge network system. Manufacture was completed on the calibrating wedge accessory by which magnified separating forces could be induced in the die holder ring, and this accessory was utilized for the high-load calibrations. Its results matched nicely with the low-load direct calibrations, and demonstrated a mechanical hysteresis of only approximately 1. Author