Importance of Standardization for Fatigue Testing

Authors: Tatsuo Sakai

Publish Date: 2007

Volume: , Issue: , Pages: 243-244

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Abstract

Mechanical structures are usually fabricated by using various kinds of metallic materials as the structural components The structural steels indicate the distinct fatigue limit in the SN property in which the SN curve becomes horizontal and no fatigue fracture occurs at the stress levels lower than this critical level Thus mechanical components have been designed to operate well at stress levels lower than the fatigue limit measured at 107 cycles However during the last decade several unexpected failures have been reported even for structural components made of ferrous metals which were assumed to have a distinct fatigue limit In recent years economic and environmental considerations have increased the need to safely extend the service life of mechanical structures such as energy conversion and transportation systems beyond their design life From this trend the fatigue behavior of structural materials in the very high cycle regime of 1091010 cycles has become an important subject of research all over the world In this background some international conferences were organized and hot discussions were made on a wide variety of the fatigue characteristics of those structural materials1 2 3

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