Controlled initiation of short fatigue cracks in 316L steel

D. Stefanescu, M. Preuss, J. Marrow, A. Sherry

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Validation of models for short crack behavior requires accurate measurement of crack opening displacement and crack tip strain fields. Development of reliable measurement procedures, using new techniques such as Image Correlation (IC), requires specimens containing cracks with a well defined geometry. In this paper, results of an experimental study concerning controlled initiation of short fatigue cracks at positive R-ratio in laboratory specimens made from 316L stainless steel are presented. Experimental techniques, including hardness testing and X-ray diffraction were employed in order to investigate the effect of surface preparation on the surface mechanical properties and residual stresses. Crack nucleation is difficult in smooth specimens of 316L austenitic stainless steel at positive R-ratio due to the high fatigue limit and low tensile strength. Specimens with a thin ligament were therefore developed to enable nucleation of a single short fatigue crack. An experimental study of the crack growth aspect ratio evolution was then carried out using a beach marking technique. The technique described in this paper enables single short fatigue cracks of well defined geometry to be nucleated under tensile cyclic loading. Stress corrosion cracks can be developed using the same specimen geometry. Miniature tensile specimens can then be extracted to perform in-situ measurements of the crack opening displacement and crack tip strain field by Image Correlation from Scanning Electron Microscopy observations.

Original languageEnglish
Title of host publicationASME 2005 Pressure Vessels and Piping Conference
Subtitle of host publicationConference proceedings
Pages303-310
Number of pages8
Volume6
DOIs
Publication statusPublished - 2005
Externally publishedYes
EventASME Pressure Vessels and Piping Conference (PVP) 2005 - Grand Hyatt Denver, Denver, United States of America
Duration: 17 Jul 200521 Jul 2005
https://asmedigitalcollection.asme.org/PVP/PVP2005/volume/41871 (Proceedings)

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
ISSN (Print)0277-027X

Conference

ConferenceASME Pressure Vessels and Piping Conference (PVP) 2005
Abbreviated titlePVP 2005
CountryUnited States of America
CityDenver
Period17/07/0521/07/05
Other2005 ASME Pressure Vessels & Piping Conference
Internet address

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