Untersuchung eigenspannungsrelevanter Elementarvorgänge bei fließgepressten Bauteilen in der Herstellungs- und Betriebsphase

Head

Prof. Dr.-Ing. habil. Marion Merklein

Researcher

Dr. Andreas Jobst

Cooperative project with the Chair of Applied Mechanics

Management Prof. Dr.-Ing. habil. Paul Steinmann

The Project is part of the DFG priority programm SPP2013 "Targeted Use of Forming Induced Internal Stresses in Metal Components".

Funding period:

Start: 1. January 2018
Ende: 31. March 2024

Abstract

The operational behavior of steel components is significantly influenced by their residual stress state. On the basis of forward rod extrusion of stainless steel, methods for the controlled generation of residual stresses are being investigated, their stability under typical operating conditions is being analyzed and their effects on the operating behavior are being identified in this research project. In the first phase, basic mechanisms of the generation of residual stresses were identified. In the current second phase, parameters for a robust adjustment of the residual stress state during forming were developed, whereby lubrication in particular was identified as relevant. Furthermore, the influence of thermal and mechanical loads on the stability of the residual stresses in the components is being investigated.

Improved component properties due to specifically generated stable residual stresses

Research groups

Bulk Metal Forming

Publications

2023

Jobst A., Merklein M.:
Stability of forming induced residual stresses in stainless steel components under mechanical load
In: Manufacturing Letters 35 (2023), p. 49-54
ISSN: 2213-8463
DOI: 10.1016/j.mfglet.2023.07.022
Jobst A., Merklein M.:
Stability of forming induced residual stresses in stainless steel parts at elevated temperature
ICRS11 - 11th International Conference on Residual Stresses (Nancy, 27. March 2022 - 30. March 2022)
URL: https://hal.univ-lorraine.fr/hal-04216289

2021

Floros D., Jobst A., Kergaßner A., Merklein M., Steinmann P.:
Towards an holistic account on residual stresses in full-forward extruded rods: Experiment, modeling and simulation of forming and operation phases
In: Archive of Applied Mechanics (2021)
ISSN: 0939-1533
DOI: 10.1007/s00419-021-01917-1
Franceschi A., Stahl J., Kock C., Selbmann R., Ortmann-Ishkina S., Jobst A., Merklein M., Kuhfuss B., Bergmann M., Behrens B-., Volk W., Groche P.:
Strategies for residual stress adjustment in bulk metal forming
In: Archive of Applied Mechanics (2021)
ISSN: 0939-1533
DOI: 10.1007/s00419-021-01903-7
Jobst A., Floros D., Steinmann P., Merklein M.:
Component residual stress control in forward rod extrusion by material flow and tribology—experiments and modeling
In: Forschung Im Ingenieurwesen-Engineering Research (2021)
ISSN: 0015-7899
DOI: 10.1007/s10010-021-00509-3
Jobst A., Merklein M.:
Influence of Material Delivery Condition on Residual Stresses and Part Properties During Forward Rod Extrusion
13th International Conference on the Technology of Plasticity (Grignano, 25. July 2021 - 30. July 2021)
DOI: 10.1007/978-3-030-75381-8_191

2020

Jobst A., Merklein M.:
Applicability of Solid Lubricant Coatings in Cold Rod Extrusion of Stainless Steels
In: Defect and Diffusion Forum (2020), p. 95-100
ISSN: 1012-0386
DOI: 10.4028/www.scientific.net/DDF.404.95

2019

Jobst A., Kiener C., Merklein M.:
Investigations on Residual Stress Generation in Extruded Steel Components
9th Congress of the German Academic Association for Production Technology (WGP) (Hamburg, 30. September 2019 - 2. October 2019)
DOI: 10.1007/978-3-662-60417-5_8
Landkammer P., Jobst A., Kiener C., Steinmann P., Merklein M.:
Investigations on residual stress generation in full-forward-extrusion
In: Production Engineering (2019)
ISSN: 0944-6524
DOI: 10.1007/s11740-019-00892-5
Landkammer P., Jobst A., Kiener C., Steinmann P., Merklein M.:
Mechanisms of residual stress generation in full-forward-extrusion
In: Production Engineering (2019)
ISSN: 0944-6524