Introduction
Weight-optimized component design and the resulting estimation of the service life or service life of metallic materials require a comprehensive understanding of fatigue processes and the systematic investigation of fatigue behavior. For reasons of time and cost alone, many components can usually neither be built as prototypes nor tes
Experimental setup and material
The stress-controlled single-stage tests were carried out on a Shimadzu type EHF-U servo-hydraulic test system with a maximum load of 50 kN, a frequency of f = 5 Hz, a sinusoidal load-time function, and a load ratio of R = -1 at room temperature with RT = 25°C.
The specimens were stressed to failure or to reach th
Lifetime calculation according to the SteBLife method
The specimens used in SteBLife are characterized by a stepped geometry with different test section diameters, which leads to different local stress amplitudes along the specimen axis under cyclic loading (Fig. 2, bottom left).
The fatigue tests are carried out at a constant force ampli
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Summary
The paper shows how non-destructive measurement methods based on temperature can be used in the context of short-term procedures for service life calculation. The procedure is presented using the example of normalized carbon steel grade C45E and the SteBLife method.
SteBLife opens up the possibility of providing signif
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Acknowledgements
The author would like to thank the German Research Foundation (DFG) for financial support of the research project (STA 1133/6-1). Further thanks go to the companies Shimadzu Germany/Europe and Micro-Epsilon for support with the experimental infrastructure.
Literature
H.-J. Christ: Ermüdungsverhalten met
Digital handling of measurement data in research
The lectures and laboratories in the Department of Materials Science contain various experiments for the determination of technological or comparable material parameters, which are provided by means of destructive and non-destructive testing methods. In addition to the use of measuring and testing
Signal processing and measurement data analysis
The lectures and laboratories in the Department of Materials Science contain various experiments for the determination of technological or comparable material parameters, which are provided by means of destructive and non-destructive testing methods. In addition to the use of measurement and testing
Use of non-destructive testing methods in a new one-specimen testing strategy for estimating fatigue data
The aim of the present research project is to exploit the potential of non-destructive testing methods, the digitalisation of measurement technology and signal processing to combine them with a novel one-specimen testing strategy in order to a
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Use of µmagnetic test methods for the evaluation of the damage evolution in metallic materials subjected to cyclic loading
In order to achieve the goal of a (residual) fatigue life calculation for metallic materials or structures, it is necessary that comprehensive information is determined and made available. This information descri
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In the case of a pressurized pipeline filled with superheated steam or supercooled water, it must be assumed after a certain operating time that the local scatter of the material properties specific to the loads continuously increases.
The effects of such influences are currently covered in general terms by safety factors in
