How to reduce the duration of multiaxial fatigue tests under proportional service loadings |
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| Affiliation: | 1. ENSAM CER de Bordeaux, Laboratoire Matériaux Endommagement Fiabilité et Ingénierie des Procédés (LAMEFIP), EA 2727, Esplanade des Arts et Métiers, F-33405 Talence Cedex, France;2. CEA-CESTA, 15 Av. des Sablières, B.P. 2, F-33114 Le Barp, France;3. RENAULT, Technocentre, Dir. Ingénierie des Matériaux, 1 Av. Golf, F-78288 Guyancourt, France;1. State Key Laboratory for Mechanical Behavior of Materials, Xi׳an Jiaotong University, Xi׳an 710049, China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi׳an Jiaotong University, Xi׳an 710049, China;3. Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka 940-2188, Japan;1. Ferrari SpA, Via Abetone Inferiore 4, 41053, Maranello (Modena), Italy;2. Institute of Structural Analysis, Leibniz Universität Hannover, Appelstrasse 9A, 30167, Hannover, Germany;3. Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, Via Giovanni Amendola 2, 42122, Reggio Emilia, Italy;4. Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via Vivarelli 10/1, 41125, Modena, Italy;1. Odessa national polytechnic university, 1Shevchenko Boulevard, 65044 Odessa, Ukraine;2. Odessa national maritime university, 34 Mechnikov Street, 65029 Odessa, Ukraine;3. Crimea federal university of the name V.I. Vernadsky,181 Kievskaya street, 295493 Simferopol, Crimea |
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| Abstract: | This paper deals with a technique to transform a multiaxial stress and strain-time sequence (in service recorded) in a simplified sequence. This simplified sequence is shorter than the original one and equivalent in terms of damage and lifetime: the number of simplified sequences to crack initiation is equal to the number of original sequences. The proposal is based on an energy threshold, below which no micro-crack can initiate or grow in the material. This technique was validated with real loading sequences recorded by strain gauges pasted on a car suspension arm. Fatigue tests were carried out on smooth specimens made of spheroidal graphite cast iron loaded in bending, in torsion and in combined bending and torsion. Experimental fatigue lives under the original sequence and under the simplified one are in very good correlation. Fatigue test duration is reduced up to a factor of 10 for the severe stress–strain sequences tested in this study. |
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