TITLE:
Evaluation of Contact Pressure in Bending under Tension Test by a Pressure Sensitive Film
AUTHORS:
Luis Fernando Folle, Lirio Schaeffer
KEYWORDS:
Coefficient of Friction, Sheet Metal Forming Process, Bending under Tension Test, Contact Pressure, Technology Applied to Design
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.6 No.4,
October
28,
2016
ABSTRACT: The contact pressure acting on the sheet/tools interface has been studied because of growing the concern about the wear of tools. Recent studies make use of numerical simulation software to evaluate and correlate this pressure with the friction and wear generated. Since there are many studies that determine the coefficient of friction in sheet metal forming by bending under tension (BUT) test, the contact pressure between the pin and the sheet was measured using a film that has the ability to record the applied pressure. The vertical force applied to pin was also measured. The results indicate that the vertical force is more accurate to set the contact pressure that using equations predetermined. It was also observed that the contact area between the sheet and the pin is always smaller than the area calculated geometrically. The friction coefficient was determined for the BUT test through several equations proposed by various authors in order to check if there is much variation between the results. It was observed that the friction coefficient showed little variation for each equation, and each one can be used. The material used was the commercially pure aluminum, alloy Al1100.