Application of non-contact strain measurement techniques to a single crystal alloy at elevated temperatures

D. E. Lempidaki, E. P. Busso, N. P. O'Dowd

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

Abstract

Single crystal materials are widely used at elevated temperatures due to their superior high temperature properties. An understanding of the deformation fields in the vicinity of sharp notches and cracks is important in order to identify failure mechanisms for these materials. In this work an optical system used for the measurement of strain fields ahead of notches or cracks in single crystals is described. High temperature tests on stationary cracks were conducted using compact tension single crystal superalloy specimens, within a specially designed furnace that provides optical access to its interior. The method used is digital image correlation whereby the grey value pattern in a predefined area is tracked during deformation using high resolution digital cameras. The full strain fields are then determined as the gradient of the deformation (displacement) field. The strain fields obtained with the optical system are compared to finite element calculations using a rate-dependent crystallographic constitutive framework. Overall, good agreement is obtained, though there are some differences between the predicted and measured strain distributions.

Original languageEnglish
Title of host publication11th International Conference on Fracture 2005, ICF11
Pages3102-3107
Number of pages6
Publication statusPublished - 2005
Externally publishedYes
Event11th International Conference on Fracture 2005, ICF11 - Turin, Italy
Duration: 20 Mar 200525 Mar 2005

Publication series

Name11th International Conference on Fracture 2005, ICF11
Volume4

Conference

Conference11th International Conference on Fracture 2005, ICF11
Country/TerritoryItaly
CityTurin
Period20/03/0525/03/05

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