Bernd Arno Behrens's research while affiliated with Leibniz Universität Hannover and other places
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Publications (7)
The surface layer of hot forging tools undergoes local microstructural changes due to high thermo-mechanical and tribological loads. Tools made of hot working steel are usually pre-heated and experience extreme heating and cooling during each forging cycle, affecting their local wear behaviour significantly. Therefore, the analysis of these tool su...
According to the current state of the art, wear conditions of forging dies are assessed visually in the dismantled state, as there is no measuring procedure available for inline wear measurement of hot forging dies. This paper introduces a handling concept for automated loading and in-situ tool inspection for a hot forging process. Based on an indu...
Hot stamping is a well-established and frequently used manufacturing process in automotive body construction. The number of components manufactured in this way is continuously increasing. Hot stamping is used to produce components with a completely martensitic structure, resulting in high strength and hardness. These components are mainly used in s...
Hot forging is a complex process involving the mutual influence of numerous thermo-mechanical-metallurgical material phenomena. In particular, the strains of transformation-induced plasticity (TRIP) have a significant influence on the distortions and residual stresses of the components. The TRIP strains refer to the anisotropic strains depending on...
Hot-forming tools are subjected to high thermal and mechanical stresses during their application. Therefore, a suitable design of the tool die is important to ensure a long tool life. For this purpose, numerical simulations can be used to calculate the occurring stresses and the temperature development in the tools during the course of a stroke or...
The damage behaviour of Advanced High Strength Steel (AHSS) differs from conventional deep-drawing steels due to their microstructure. For example, shear fracture can occur unexpectedly without prior necking, leading to inaccuracies using Forming Limit Diagram (FLD). An improvement of failure prediction can be obtained by the use of stress state de...
Advanced High Strength Steels (AHSS) are widely used in today's automotive structures for lightweight design purposes. FE simulation is commonly used for the design of forming processes in automotive industry. Therefore, besides the description of the plastic flow behaviour, also the definition of forming limits in order to efficiently exploit the...
Citations
... Principle of resistance heating of a rectangular sheet metal[26] ...
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... The simultaneous or additional consideration of the dies in the simulation process enables an estimation of the stresses on the forging dies under the stresses caused by the forming process and can thus be used to predict the die stability and life time. In addition, numerical simulations can be used to optimise the dies in a cost-effective manner and to increase the service life time by optimisation [6]. Usually isothermal linear-elastic simulations are used, where the focus is on the load in the first cycle. ...
... For the flow behaviour the yield criterion YLD2000 from Barlat et al. [10] and the flow curve extrapolation approach from Hockett and Sherby [11] were applied. The corresponding material characterisation and material modelling of the HCT980X was priorly published by the authors in [12]. The rolling direction was set to y-direction, as in the experiments. ...
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