Generally, springback can be reduced via increasing the tension deformation in the sheet metal. Increased tension strain can in turn decrease the stress gradient through the sheet thickness direction, thus causing the less springback.
However, this approach may induce over-thinning of the deformed part, which also cause the fracture risk. To do this, some optimization methods always employed to explore the suitable combination of forming parameters.
Jun Ma Thank you very much for your reply Sir. but how to prove mathematically??
For a common bending case,when the tension deformation in sheet metal (especially in the region that is near the yield of the sheet) is increased, the stress gradient through the thickness direction can be dramatically reduced. Thus, the bending moment of the bent part would be reduced. This is the fundamental principle for springback reduction and can be mathematically proved by establishing analytical model on the basis of force/moment equilibrium equations. In practical forming operations, most springback reduction methods rely on the principle, such as increased or variable blank holder force, double-bend method, etc.
I am forwarding an article, hope that it may helpful.
https://www.dynalook.com/european-conf-2003/influence-of-the-effect-of-strain-rates-on.pdf
Dhanesh G Mohan Thank You Sir for your suggestion. I read the article, but it only conclude the effect of strain rate on spring back. Author has not included any physics behind that.
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