42nd International Deep Drawing Research Group Conference - IDDRG 2023

Stress measurement errors in the tension-shear tests using a cruciform specimen are evaluated. The tension-shear test method was proposed by Minki et al (2022). A servo-controlled biaxial tensile testing apparatus is used as the testing machine. The gauge area (GA) of the tension-shear specimen receives normal stress, σxx, and shear stress, σxy; however, the stress distribution in the GA is...

In order to save resources in component production, the use of finite element (FE) simulations is state of the art during the design of the process. Thus, expensive tool modifications can be prevented and laborious experimental tests can be reduced. For a high accuracy of a FE simulation, realistic material data is required to model the material behaviour. Unlike the flow behaviour, the...

High-strength steels are widely used in the body in white of vehicles offering a good balance between crashworthiness and lightweight design. The increased requirements of heavier electric vehicles in terms of fatigue resistance and crashworthiness highlighted that chassis parts have remarkable lightweighting potential. However, applying these grades in chassis parts is not straightforward, as...

Sheet metal formed parts are often produced in multistage processes. The multi-directional deformations that occur in this process pose a challenge for sufficiently accurate modeling of the material behavior. In this paper, we present an experimental methodology and its potential that serves as a basis for a comprehensive validation of material models with respect to multi-directional...

In the conflict between lightweight design and crash safety of high-strength steel components failure models for crash simulation have to be calibrated precisely. Especially the negative strain rate effect concerning the shear failure strain of high-strength steel sheets as well as the fact that ductile shear failure occurs immediately and without previous necking are safety-critical aspects....

Thanks to their very important strength in addition to their considerable formability and ductility, the newly developed Advanced High-Strength Steel (AHSS) allow carmakers to save mass on the vehicles they produce. However, before industrial implementation by OEMs, any grade has to be approved. The bending test defined in VDA238-100 standard is a key indicator of the material ductility and is...

As automakers are challenged to improve safety and weight reduction, they continue to search for new solutions to meet the higher performance demands of body structures. The combination of the Laser Welded Blanks (LWB) technology with 3rd generation of Advanced High-Strength Steels (AHSS) for cold stamping is responding to that challenge. The new Fortiform® (3rd generation of AHSS) based LWB...