@inproceedings{SwidergalWagnerLubsederetal., author = {Swidergal, Krzysztof and Wagner, Marcus and Lubseder, C. and von Wurmb, I. and Meinhardt, Josef and Marburg, Steffen}, title = {Investigation of the forming tool dynamics by means of numerical simulation}, series = {Advanced Metal Forming Processes in Automotive Industry, AutoMetForm 2016}, booktitle = {Advanced Metal Forming Processes in Automotive Industry, AutoMetForm 2016}, publisher = {Fraunhofer}, pages = {335 -- 340}, abstract = {In the forming tools for pressing car body parts, heavy blankholders are used to prevent buckling and wrinkling of the blank. During each press cycle, those large masses need to be lifted, raising thereby the structural dynamic load on the forming tool and on the press. Therefore a detailed knowledge about the forming tool dynamics is essential for an accurate and robust design of forming tools. In this paper, a dynamic finite element method (FEM) simulation of selected automotive forming tool is presented enabling identification of regions of critical stresses. For validation of the simulation results, the kinematic responses of the tool's components are compared with the measurements obtained in an experiment.}, language = {en} } @inproceedings{ThumannWagnerSucketal., author = {Thumann, Philipp and Wagner, Marcus and Suck, Bertram and Meinhardt, Josef and Marburg, Steffen}, title = {Explicit and Implicit FE Simulations of Material Tests for Subsequent Durability Analyses}, series = {11th European LS-DYNA Conference, Salzburg}, booktitle = {11th European LS-DYNA Conference, Salzburg}, abstract = {Because of increased stroke rates the loads on forming tools increase too. To ensure a save design of components, durability analyses are intended. For this, simulation results from FE analyses are necessary. Therefore, it is desirable to use elements with quadratic function, because of a good stress approximation.The goal of the described investigation is to show if calculation results created by LS-DYNA [1] can be used for durability analyses. Especially the use of quadratic elements is investigated. For the evaluation, on the one hand explicit FE analyses of a special durability test are carried out. These analyses are validated by available test data. To create results for later durability analyses further FE analyses with implicit time discretisation are carried out. In this paper results of the investigations are presented and evaluated critically.}, language = {en} } @inproceedings{SwidergalWagnerLubesederetal., author = {Swidergal, Krzysztof and Wagner, Marcus and Lubeseder, Christian and Wurmb, Ingo von and Meinhardt, Josef and Marburg, Steffen}, title = {Finite element simulation of blankholder's lift-off in a deep drawing tool using Abaqus/Standard}, series = {SIMULIA Community Conference, 19 - 21 May 2015, Berlin, Germany}, booktitle = {SIMULIA Community Conference, 19 - 21 May 2015, Berlin, Germany}, abstract = {In the deep drawing tools for forming car body parts, heavy blankholders are used to prevent buckling and wrinkling of the blank. During each press cycle, those large masses need to be lifted, raising thereby the structural dynamic load on the deep drawing tool and on the press. Therefore a detailed knowledge about the blankholder's lift-off event is essential for an accurate and robust design of forming tools. In this paper, a dynamic finite element method (FEM) simulation of a blankholder's lift-off in a selected automotive deep drawing tool is presented enabling identification of regions of critical stresses. The FEM model is built within the Abaqus/CAE environment and solved with Abaqus/Standard. Each dynamic analysis is preceded by a static analysis where the gravity load is applied and the lifting bolts are pre-stressed. A special emphasis is put on modeling the elastomer dampers, which are installed between lifting bolts and the blankholder to avoid hard impacts during the lift-off event. Those dampers are modelled using a hyperelastic material with hysteresis. In addition, an experimental validation of a blankholder's vibration under operating loading was carried out. The simulation results are in good agreement with the measurements.}, language = {en} } @inproceedings{SwidergalLubesederWurmbetal., author = {Swidergal, Krzysztof and Lubeseder, Christian and Wurmb, Ingo von and Meinhardt, Josef and Wagner, Marcus and Marburg, Steffen}, title = {Vibration analysis of an automotive forming tool using coupled MBS-FEM simulation and experimental validation}, series = {Proceedings of the 26th International Conference on Noise and Vibration Engineering (ISMA2014), Leuven, Belgium}, booktitle = {Proceedings of the 26th International Conference on Noise and Vibration Engineering (ISMA2014), Leuven, Belgium}, pages = {2931 -- 2942}, abstract = {To improve efficiency in automotive press shops, press systems with increasingly high stroke rates are beingimplemented, raising thereby the structural dynamic load on the press and especially on the forming tool. Adetailed knowledge of the vibrations and resulting critical loads is thus essential for accurate and reliable de-signs of forming tools. In this paper, multibody simulation (MBS) of a selected automotive tool is presentedenabling the identification of the vibration of its components. Starting from a pure rigid modelling approach,the MBS model is extended by adding finite element (FE) component to allow extra flexibility in the sys-tem. As an example, a detailed vibrational analysis - both in time and frequency domain - is performed ona blankholder. Also an experimental validation of a blankholder vibration under operational load is carriedout, with test signal data gained by piezoelectric accelerometers.}, language = {en} } @inproceedings{SwidergalLubesederWurmbetal., author = {Swidergal, Krzysztof and Lubeseder, Christian and Wurmb, Ingo von and Lipp, Arnulf and Meinhardt, Josef and Wagner, Marcus and Marburg, Steffen}, title = {Structural analysis of an automotive forming tool for large presses using LS-DYNA}, series = {10th European LS-DYNA Conference, W{\"u}rzburg}, booktitle = {10th European LS-DYNA Conference, W{\"u}rzburg}, language = {en} } @inproceedings{SwidergalLubesederWurmbetal., author = {Swidergal, Krzysztof and Lubeseder, Christian and Wurmb, Ingo von and Meinhardt, Josef and Wagner, Marcus and Marburg, Steffen}, title = {Effiziente Methode zur Bestimmung von dynamischen strukturellen Belastungen in Großpresswerkzeugen}, series = {36. EFB-Kolloquium Blechverarbeitung 2016, Fellbach}, booktitle = {36. EFB-Kolloquium Blechverarbeitung 2016, Fellbach}, language = {de} } @inproceedings{SwidergalThumannLubesederetal., author = {Swidergal, Krzysztof and Thumann, Philipp and Lubeseder, Christian and Wurmb, Ingo von and Meinhardt, Josef and Wagner, Marcus and Marburg, Steffen}, title = {Modeling and simulation of carbon black filled elastomer damper using LS-DYNA}, series = {LS-DYNA Forum 2014, Bamberg}, booktitle = {LS-DYNA Forum 2014, Bamberg}, language = {en} }