Fry, A T; Lodeiro, M J; Koko, A; Booth-Downs, F; Crocker, L E (2023) Effect of specimen misalignment in static and fatigue testing of small-scale test pieces. NPL Report. MAT 122

Preview

Text (NPL Report MAT 122) MAT 122.pdf - Published Version Download (5MB) | Preview

Abstract

Low cycle fatigue (LCF) tests simulating in-service conditions have long been known to be difficult to devise and perform. They can be expensive to execute and can frequently give unreliable results. They, however, remain essential for the safe design and operation of components occasionally stressed into the plastic region. In 1987 an intercomparison was conducted under the auspices of VAMAS, the Versailles Project on Advanced Materials and Standards. Technical Working Area (TWA) 13 was created and investigated the influence that specimen alignment played on LCF testing. Since these studies mechanical testing has progressed, and the use of smaller miniaturised samples has grown in popularity. Within ISO work is underway in ISO TC 164/SC 1 “Uniaxial Testing” to develop “guidelines for Testing Miniaturised Test Pieces”. At present within these guidelines there is limited guidance on the effect of misalignment. The work detailed in this report was undertaken to examine the magnitude of the effect on the tensile properties and fatigue life of miniaturised samples under controlled levels of purposely introduced misalignment.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 122
Subjects:	Advanced Materials > Mechanical Measurement
Divisions:	Materials and Mechanical Metrology
Identification number/DOI:	10.47120/npl.MAT122
Last Modified:	30 Aug 2023 08:06
URI:	https://eprintspublications.npl.co.uk/id/eprint/9798