Tube and sheet hydroformed steel components for autobody application

Drewes, E.; Blümel, Klaus W.; Lenze, F.-J.

doi:10.1051/metal:2001139

Cited by 2 publications

(2 citation statements)

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“…Today's solution for the continuous strive for faster and safer vehicles, especially in the automotive industry, is the combination of innovative joining and forming technologies and materials with high lightweight potential. Among the forming technologies sheet hydroforming and in particular double sheet hydroforming is one of the most promising techniques for the production of complex hollow bodies with high strength and stiffness [1][2][3][4][5][6]. Such properties can be better achieved with the use of high strength steels, such as dual phase (DP) and transformation induced plasticity (TRIP) steels.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand the excess of stabilization of austenite using high hydrostatic pressure levels could also lead to a less favourable strain-hardening during forming. In general, the main disadvantage of TRIP steels is due to their very high stress due to strain hardening [3], that increases the springback behaviour after forming operations and affects the subsequent residual stress state.…”

Section: Introductionmentioning

confidence: 99%

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A study of techniques in the evaluation of springback and residual stress in hydroforming

Bruni

Celeghini

Geiger

et al. 2006

Int J Adv Manuf Technol

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The increasing need for high strength complex hollow bodies for automotive application is pushing towards the use of sheet hydroforming techniques in conjunction with high strength steels. Unfortunately high strength steels are characterised by high springback levels. In this paper the springback and residual stresses have been analysed by means of laboratory trials carried out using the double sheet hydroforming technique. The attention has been focused on the upper blank of TRIP800 steel. The analysis has been performed using different approaches: i) characterisation of sample accuracy by means of a 3D coordinate measuring machine using a new proposed method based on the standard deviation calculation; ii) FEanalysis of both hydroforming and springback stages using an implicit FEM code; iii) residual stress evaluation by means of X-ray diffraction and laser cutting techniques. The effect of pressure, die insert geometry and friction at the blank holder on springback and residual stresses have been analysed and discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%