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Estimation of Component Life Using Stress Distribution Parameters
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English
Abstract
The determination of the component fatigue life under cyclic loading with variable stress amplitudes is a problem of high interest for the automobile engineer. This paper is a theoretical study showing that the factors influencing the value of the expected life can be specified by the choice of a convenient mathematical formulation of the loading spectrum shape, of the S-N curve slope, and of an appropriate cumulative damage law. The final equation proved to be suitable for graphical presentation. That allowed construction of a very general nomograph for rapid informative calculations and thus allowed time for further quantitative analysis of the influence of every considered parameter separately, as well as for the formulation of requirements on the accuracy of their determination. According to these results, the influence of the spectrum width (maximum stress range) appeared as the most serious one followed by the influence of the unit spectrum size, of the slope of the S-N curve, and of the degree of its modification, while the influence of the spectrum shape (that is, of the changes inside the range of the exponential type of distribution and the normal one) was by far of a lower importance. This work can serve not only for the decision about the most effective way for redesigning a weak component but also for comparing two program load tests.
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Citation
Hanke, M., "Estimation of Component Life Using Stress Distribution Parameters," SAE Technical Paper 700034, 1970, https://doi.org/10.4271/700034.Also In
References
- Hanke M. “Laboratory Analogy of the Service Loading of a Single-Track Vehicle.” Automobil (Prague) 1 1964 18 23
- Hanke M. “Eine Methode zur Beschreibung der Betriebslastkollektive als Grundlage für Betriebsfestigkeitsversuche.” ATZ 3 1970 91 97
- Hanke M. Hromir M. “Zur Berechnung der Betriebsfestigkeit nach der Schaden-Akkumulationshypothese von Corten-Dolan.” Materialprüfung 6 1969 189 196
- Corten H. T. “Application of Cumulative Fatigue Damage Theory to Farm and Construction Equipment.” SAE Transactions 72 1964 paper 735-A
- Gassner E. “Betriebsfestigkeit.” Konstruktion 3 1954 97 104
- Hanke M. “A Study of the Evaluation of Service Loading and of the Calculation of Fatigue Life of Motor Car Components.” Report of the Motor Car Research Institute UVMV Prague 1967
- Graham J. A. Olberts D. R. Wolf L. C. “A Method to Reduce Time for Estimation of Component Life.” SAE Transactions 72 1964 paper 735-B
- Gassner E. Griese F. N. Haibach E. “Ertragbare Spannungen und Lebensdauer einer Schweissverbindung aus Stahl St. 37 bei verschiedenen Formen des Beanspruchungskollektivs.” Archiv für Eisenhüttenwesen 3 1964 255 267
- Graham J. A. Olberts D. R. Wolf L. C. “A Method to Reduce Time for Estimation of Component Life.” SAE Transactions 72 1964 paper 735-B
- Swanson S. R. “An Investigation of the Fatigue Life of Aluminum Alloy Due to Random Loading.” HTIA Report No. 84 University of Toronto February 1963
- Bussa S. L. “Fatigue Life of a Low Carbon Steel Notched Specimen Under Stochastic Conditions.” Wayne State University 1967
- Jaeckel H. Swanson S. R. “Random Load Spectrum Test to Determine Durability of Structural Components of Automotive Vehicles.” MTS Systems Corp. May 1968
- Swanson S. R. “Evaluating Component Fatigue Performance Under Programmed Random and Programmed Constant Amplitude Loading.” Paper 690050 SAE Automotive Engineering Congress Detroit January 1969