Abstract
In this work, the influence of material models used in the FEM simulation on the springback prediction is investigated. The interest of this paper is to extend the knowledge base regarding springback predictions in numerical simulation. The springback effect of a V-shaped sheet metal part made of TRIP steel, with a thickness of 0.75 mm was investigated. The bending angle was set to 90°. In the numerical simulation, Hill48 and Barlat yield criteria were used in combination with Ludwik's and Swift's hardening models. Achieved data from the numerical simulations were compared and evaluated with experimental test results. The experimental results showed the relation between springback and calibration force. The effect of specimen cut direction on the springback was smaller in comparison with the calibration force. The numerical results of the springback were not identical with the experimentally achieved springback values in most cases. Particularly, when a calibration force of 1 800 N was used in the simulation. The simulation results showed a good correlation between experimental and numerical results, when Hill48 and Barlat yield criteria were used in combination with Ludwik hardening law and calibration force F with the value 900 N was applied.
Highlights
High-strength steel has been used by automobile manufacturers for almost thirty years
It can be assumed, that calibration force has a significant impact on the springback
The main reason for it can be attributed to different stress, strain values, and strain paths which depend on the material model and its inputs, which can significantly influence the springback predictions
Summary
High-strength steel has been used by automobile manufacturers for almost thirty years now. The main characteristic of TRIP steels is that they modify the microstructure during the plastic deformation process as part of the austenite transformation to martensite, with the following change of the material properties. Lawanwong et al [9] proposed a novel technology called “double-action bending” to eliminate the springback of the stamped part made of advanced high-strength steel. They used FE analysis to determine process and tool parameters before the experiment try-out. In the industries which produce stampings, such as the automotive industry, accurate predictions of forming process, including stress-strain distribution, springback and thickness are necessary [10].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
