Special testing equipment and validation of measurement methodologies for high temperature low cycle fatigue testing of miniature metallic specimens
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Date
2016-02-25
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Nature
Abstract
A technique for high temperature low cycle fatigue testing of metallic materials has been developed, to determine fatigue behaviour through the testing of miniature specimens. The miniature specimen geometry was specifically designed, such that it could be manufactured from a small volume of material removed by chain-drilling extraction. An extensometry method to measure and control strain at the specimen shoulders during testing was adopted. This was undertaken to minimise the deleterious contact effects that can occur via extensometry attached at the gauge length of specimens, hence leading to premature failure and inaccurate fatigue data. By the application of this technique, the high temperature low cycle fatigue behaviour of 2.25Cr-1Mo steel was successfully characterised at 540 °C, under a fully reversed strain-controlled regime. The fatigue properties of the steel obtained from testing miniature specimens were shown to correlate well with existing literature for the material under comparable conditions, as determined by the testing of conventional standard-sized specimens. © 2016 Society for Experimental Mechanics
Description
Keywords
Temperature range 0400-1000 K, Steels, Extensometers, Materials testing, Strains, Fatigue
Citation
Callaghan, M. D., Humphries, S. R., Law, M., Bendeich, P., & Yeung, W. Y. (2016). Special testing equipment and validation of measurement methodologies for high temperature low cycle fatigue testing of miniature metallic specimens. Experimental Mechanics, 56(6), 1039-1050. doi:10.1007/s11340-016-0145-2