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Article

On the Influence of Ultimate Number of Cycles on Lifetime Prediction for Compression Springs Manufactured from VDSiCr Class Spring Wire

Centre for Engineering Materials (MPA-IfW), TU Darmstadt, Grafenstrasse 2, 64283 Darmstadt, Hessia, Germany
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Materials 2020, 13(14), 3222; https://doi.org/10.3390/ma13143222
Received: 2 June 2020 / Revised: 7 July 2020 / Accepted: 14 July 2020 / Published: 20 July 2020
(This article belongs to the Special Issue Probabilistic Mechanical Fatigue and Fracture of Materials)
For the generation of fatigue curves by means of fatigue tests, an ultimate number of cycles must be chosen. This ultimate number of cycles also limits the permissible range of the fatigue curve for the design of components. This introduces extremely high costs for testing components that are to be used in the Very High Cycle Fatigue regime. In this paper, we examine the influence of the ultimate number of cycles of fatigue tests on lifetime prediction for compression springs manufactured from VDSiCr class spring wire. For this purpose, we propose a new kind of experiment, the Artificial Censoring Experiment (ACE). We show that ACEs may be used to permissibly extrapolate the results of fatigue tests on compression springs by ensuring that a batch-specific minimum ultimate number of cycles has been exceeded in testing. If the minimum ultimate number of cycles has not been exceeded, extrapolation is inadmissible. Extrapolated results may be highly non-conservative, especially for models assuming a pronounced fatigue limit. View Full-Text
Keywords: VDSiCr; SWOSC-V; spring steel; fatigue; compressions springs; VHCF; FKM guideline VDSiCr; SWOSC-V; spring steel; fatigue; compressions springs; VHCF; FKM guideline
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MDPI and ACS Style

Geilen, M.B.; Klein, M.; Oechsner, M. On the Influence of Ultimate Number of Cycles on Lifetime Prediction for Compression Springs Manufactured from VDSiCr Class Spring Wire. Materials 2020, 13, 3222. https://doi.org/10.3390/ma13143222

AMA Style

Geilen MB, Klein M, Oechsner M. On the Influence of Ultimate Number of Cycles on Lifetime Prediction for Compression Springs Manufactured from VDSiCr Class Spring Wire. Materials. 2020; 13(14):3222. https://doi.org/10.3390/ma13143222

Chicago/Turabian Style

Geilen, Max Benedikt, Marcus Klein, and Matthias Oechsner. 2020. "On the Influence of Ultimate Number of Cycles on Lifetime Prediction for Compression Springs Manufactured from VDSiCr Class Spring Wire" Materials 13, no. 14: 3222. https://doi.org/10.3390/ma13143222

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