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Springback as a Function of Strength and Thickness Variability in High Strength Sheet Steels
Technical Paper
2000-01-2658
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Springback in sheet metal forming is becoming a very troublesome issue with the increased use of high strength steels in automobiles. The current trend for many applications is to reduce vehicle weight by down-gaging, that is, substituting higher strength, thinner steels for lower strength, thicker steels. The primary springback concern in sheet metal forming is variation in springback, rather than the magnitude of the springback. Even large springback can be accommodated if it can be consistently predicted. Variations in springback are caused by variations in mechanical properties and gage, and by fluctuations in the conditions of the forming process. This paper addresses the expected springback issues associated with the application of high strength sheet steels in light of strength and thickness uniformity. A simple expression is used to show how variations in yield strength and gage may be expected to influence springback in sheet metal forming. Also, the implications of down-gaging are discussed in the context of mechanical property and thickness variability data tabulated for actual production materials.
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Citation
Hance, B., "Springback as a Function of Strength and Thickness Variability in High Strength Sheet Steels," SAE Technical Paper 2000-01-2658, 2000, https://doi.org/10.4271/2000-01-2658.Also In
References
- Dieter G.E. Mechanical Metallurgy Third Edition McGraw-Hill New York 1986
- Bower J.E. “Use of Springback Tester with Steels Having Nonlinear Stress-Strain Curves” Materials Research and Standards 5 12 ASTM December 1965 607 610
- Ptashnick W.J. et al. Material Uniformity Project Team Material Uniformity of High Strength Sheet Steels --Vol. 2 Auto/Steel Partnership Southfield, MI, USA 1998
- High Strength Steel Awareness Task Force High Strength Steel Bulletin Edition 4 Auto/Steel Partnership