Published: Jan 2005
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Fatigue failures of structural components continue to be a serious concern to the well-being and economics of our worldwide society because the majority of all such components fail by this mechanism. If some of these failures could be prevented through better design with our understanding of how materials behave, it would have a major impact on the economics of society.
American Society for Testing and Materials International (ASTM) Committee E08 on Fatigue and Fracture, International Organization for Standardization, Technical Committee 164, Subcommittee 5 (ISO/TC164/SC5) on Fatigue Testing of Metallic Materials and other relevant committees interested in the fatigue phenomena are involved in developing standards for testing and analysis under variable amplitude loading. Currently no variable amplitude fatigue testing standards exist. The organizational structures of some committees are provided along with examples of variable amplitude fatigue failures. There is some interaction between ASTM, European Structural Integrity Society (ESIS), and ISO, and it is hoped that additional interaction will occur so that all of the vast knowledge on fatigue from around the world may be focused to develop standards that will benefit everyone.
To demonstrate the need for such international standards, several examples of variable amplitude-type failures are presented and discussed. As a result of such failures, there is an obvious need to translate the constant amplitude and variable amplitude laboratory test data into the design of real structures.
Fatigue, constant amplitude, variable amplitude, endurance limit, standards, AFNOR, ASTM, ANSI, ECISS, ESIS, ISO, structure integrity
Exponent Failure Analysis Associates, Menlo Park, CA
W. L. Gore & Associates, Flagstaff, AZ
BNS, Iron & Steel Standards Office, La Défense,