MEC445 P1 Punch test – Industrial Applications of Finite Element Analysis, UOS, UK
| University | The University of Sheffield (TUOS) |
| Subject | MEC445 Industrial Applications of Finite Element Analysis |
Project 1 Outline
Title: Formability test
Problem Description
A punch-stretching formability test has been carried out on a newly developed automotive Advanced High Strength Steel (DP1000), in order to characterise the formability of the material and in particular the extent of plastic deformation before failure. DP1000 is often used for body-in-white structural and reinforcement components such as pillar reinforcements and crash structures as well as for lightweight seat structures. Displacement and strain profiles have been measured on the top surface of the specimen using 3D Digital Image Correlation (DIC).
Figure 1 shows the test set up with the DIC cameras and a schematic drawing of the test rig. The specimen is a 90 mm diameter circular blank with a thickness of 1.5 mm. Additional drawings of the rig are provided in the Appendix. The measured tensile stress/strain curve for the material is given in
Figure 2. The specimen is loaded through a vertical displacement upward of the machine cross-head at a speed of 2.5 mm/min, the blank holder being fixed in space during the test.
Figure 3 shows the deformed specimen after failure at the end of the test after a total travel of the cross-head of 12 mm, the out-of-plane displacement uz normal to the specimen just before failure and the strain component exy , exx and eyy maps measured just before and after failure.
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Problem Objectives
You will need to:
- Produce a finite element model(FEM) of the punch-stretching formability test.
- Define material property of DP1000 based on experimental stress-strain data provided.
- Compare the FE-predicted strain distributions with experimental results before failure.
- Discuss any deviations between the FEM and experimental data and where they might come from.
- Consider and discuss how this model could be used by both the metal forming and automotive industries to improve their products.
Fig. 1 – a) Test set up with DIC cameras and b) schematic drawing of the rig
Fig. 2 – Stress/strain curve of DP1000 steel
Fig. 3 – a) Deformed specimen at the end of the test, b) out-of-plane displacement map just before failure, c) exy map just before and after failure, d) exx map just before and after failure and e) eyy map just before and after failure
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