Qualification of a fatigue test for the investigation of the behavior of high-strenth tool materials under realistic conditions by elastomer compression
Head
Researcher
Funding period:
Start: 1. January 2022
Ende: 31. December 2023
Abstract
Tools and tool failure have major influence on the economic efficiency of cold forging processes. In order to minimize losses due to machine downtimes, it is necessary to accurately predict the service life. A challenge in the prediction of tool life is that there is little data on the fatigue behaviour of the used high strength steel materials. In addition, the quality of the available data is limited, as it does not reflect the multi-axial stress conditions of cold forging. The objective of the research project is therefore to investigate a new fatigue test, which can realistically model the stress state occurring in cold forming tools considering both the multi-axiality and the application of compressive prestresses. For this purpose, an elastomer made of polyurethane is used as a pressure medium in a tool for fatigue testing. A cyclic hydrostatic pressure is applied by the repeated compression of the elastomer. The comparability of the tool stresses to the forming of steel is ensured by analyzing the stresses both numerically and experimentally. A challenge in the experimental concept is wear on the elastomer specimen, which is to be minimized by adapting the test parameters. In order to illustrate realistic load cases, the transferability of the test results to systems under preload is demonstrated. In a combined numerical-experimental approach, both conventional reinforcements and new concepts for local prestressing will be investigated. This enables the identification of cause effect relationships between the stresses and strains caused by the reinforcement and the service life of the tools under realistic loads. Finally, the obtained results will be used to evaluate the potential of the test and the benefit compared to conventional fatigue tests.
Research groups
Publications
2023
- , :
Fatigue testing of cold forging tools using elastomer compression
In: CIRP Annals - Manufacturing Technology 72 (2023), p. 241-244
ISSN: 0007-8506
DOI: 10.1016/j.cirp.2023.03.007 - , :
Use of elastomers as pressure media for fatigue testing of cold forging tools
In: Procedia Structural Integrity 42 (2023), p. 66-71
DOI: 10.1016/j.prostr.2022.12.007
URL: https://www.sciencedirect.com/science/article/pii/S2452321622005649
2022
- , :
Prestressing of cold forging tools for parts with functional elements
XL. Colloquium on Metal Forming (Zauchensee, 12. March 2022 - 16. March 2022)
In: Lehrstuhl für Umformtechnik, Montanuniversität Leoben, Martin Stockinger (ed.): XL. Colloquium on Metal Forming 2022
Deutsch