The University of Southampton
University of Southampton Institutional Repository

Deflected teardrop cracking in nickel based superalloys: sustained macroscopic deflected fatigue crack growth

Schoettle, C., Sinclair, I., Starink, M.J. and Reed, P.A.S. (2012) Deflected teardrop cracking in nickel based superalloys: sustained macroscopic deflected fatigue crack growth International Journal of Fatigue, 44, pp. 188-201. (doi:10.1016/j.ijfatigue.2012.04.017).

Record type: Article

Abstract

A sustained macroscopic deflected fatigue crack growth, the so-called ‘tear drop’ crack (TDC), has been observed under mode I (tensile) loading in Udimet 720Li when tested at 300°C in air and at 300, 600 and 650°C in vacuum. A definition of the onset of sustained shear crack growth is proposed and applied to different test geometries in different temperatures and environments. SEM analysis of the fracture surfaces have shown a competition between the sustained shear and mode I crack growth modes in both the terraced shear lip and flat tear drop region, which indicates that the macroscopic deflection is triggered by the free surface.

The tilt angles measured from the deflections have been used to define a mixed mode plane stress test, attempting to replicate the stress state giving rise to deflected shear growth.

PDF Schoettle_et_al_TDC_IJFat_2012.pdf - Version of Record
Restricted to Repository staff only
Download (3MB)

More information

e-pub ahead of print date: 17 May 2012
Published date: November 2012
Keywords: nickel based superalloys, teardrop cracking, sustained deflected fatigue crack growth, mixed mode
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 339007
URI: http://eprints.soton.ac.uk/id/eprint/339007
ISSN: 0142-1123
PURE UUID: f5d5e416-a188-4187-9ce2-d8b89fc3df47
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 21 May 2012 14:10
Last modified: 18 Jul 2017 05:55

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×