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      Design Optimization of Components Based on Material Mechanics Fatigue Concepts : Dedicated to Professor Joachim W. Bergmann on Occasion of his 65 th Birthday Translated title: Bauteiloptimierung auf Basis werkstoffmechanischer Ermüdungskonzepte

      Materials Testing
      Carl Hanser Verlag

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          The paper deals with the fatigue design concepts for engineering components based on material properties and mechanics, i.e. the Short Crack Model (SCM), the Local Strain Approach (LSA), and the Effective Notch Stress Concept (ENSC) for welds. The calculation procedures are presented and their accuracy and robustness are demonstrated on the example of a cab bearing console providing complex geometry (geometry notch, weld with pronounced start and ends) and subjected to operating loading with variable stress amplitudes and mean stresses. Parametrical studies considering two ductile steels were performed. Comparison of calculated curves by means of the SCM and the LSA supported by the P SW T-parameter explores life factors of 3 to 6.7 emphasizing the crucial influence of load sequence effects on fatigue life and the usefulness of the SCM to consider them. The choice of the material influences the lifetime of the console significantly (life factors of ∼5 to ∼11 depending on the applied model). The weld design was assessed by the ENSC to be safe.


          Im vorliegenden Beitrag werden örtliche Konzepte für die Auslegung von Bauteilen diskutiert. Es wird insbesondere auf das Kurzrissmodell, das örtliche Konzept und das Konzept der effektiven Kerbspannung eingegangen. Ihre Robustheit wird am Beispiel einer Lkw-Fahrerhauskonsole mit komplexer Geometrie (geometrische Kerben, Schweißkerben mit Nahtanfang und -ende) und Betriebsbelastung (zusammengesetzte Lasten mit Mittelspannungen und variablen Amplituden) demonstriert. Die parametrischen Studien decken zwei Werkstoffe ab. Die nach dem Kurzrissmodell und dem örtlichen Konzept (unterstützt vom P SWT-Parameter) errechneten Anrisslebensdauern unterscheiden sich — je nach Werkstoff — um einen Lebensdauerfaktor von 3 bis 6,7. Dies zeigt den großen Einfluss von Last-Reihenfolgeeffekten auf die Betriebslebensdauer und die Leistungsfähigkeit des Kurzrissmodells bei ihrer Erfassung. Die Wahl des Werkstoffes beeinflusst die Anrisslebensdauer — je nach Konzept — um Lebensdauerfaktoren ∼5 bis ∼11. Die Schweißkerben wurden nach dem Konzept der effektiven Kerbspannung als ermüdungssicher bewertet.

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          Most cited references24

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          A Path Independent Integral and the Approximate Analysis of Strain Concentration by Notches and Cracks

          J R Rice (1968)
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            Cumulative Damage in Fatigue

            The phenomenon of cumulative damage under repeated loads was assumed to be related to the net work absorbed by a specimen. The number of loading cycles applied expressed as a percentage of the number to failure at a given stress level would be the proportion of useful life expended. When the total damage, as defined by this concept, reached 100 per cent, the fatigue specimen should fail. Experimental verification of this concept for an aluminum alloy, using different types of specimens, various stress ratios, and various combinations of loading cycles is presented. These data are also analyzed to provide information on different stress ratios when an S-N curve for any one ratio is known. Results of a sample analysis based on experiments are given. It is concluded that a simple and conservative analysis is possible using the concept of cumulative fatigue damage.
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              Fatigue: A complex subject—Some simple approximations


                Author and article information

                Materials Testing
                Carl Hanser Verlag
                : 53
                : 3
                : 136-143
                1 Thessaloniki, Greece
                Author notes

                Assoc. Professor Dr.-Ing. Georgios Savaidis, born 1964, studied Mechanical Emgineering at the Technical University Darmstadt. From 1989 to 1995 he worked as scientific worker at the Institut für Stahlbau und Werkstoffmechanik at the Technical University Darmstadt and achieved his Dr.-Ing. degree in 1995. From 1995 to 2003 he was Experimental Engineer and later Head of the Department for fatigue and Test Rigs at the MAN Nutzfahrzeuge in München. Since 2003, he is Professor in the Department of Mechanical Engineer- ing, Laboratory of Machine Elements and Machine Design at the Aristotle University of Thessaloniki.

                © 2011, Carl Hanser Verlag, München
                Page count
                References: 43, Pages: 8
                Self URI (journal page): https://www.hanser-elibrary.com/loi/mp
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science


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