Methodology for in situ stress intensity factor determination on cracked structures by digital image correlation

• Type: Article in International Scientific Journal
• Date: 2010-01-01

Authors

Paulo Tavares de Castro (Author) FEUP; V. Richter-Trummer (Author) FEUP; P.M.G.P. Moreira (Author) FEUP; S. D. Pastrama (Author) Other; Mário Vaz (Author) FEUP

Journal

Title: International Journal of Structural Integrity

Vol. 1 No. 4

Pages: 344-357

ISSN: 1757-9864

Publisher: Emerald

Indexing

Scopus - 6 Citations

Other information

Authenticus ID: P-007-Y4C

DOI: 10.1108/17579861011099178

Abstract (EN): Purpose - The purpose of this paper is to develop a methodology for in situ stress intensity factor(SIF) determination that can be used for the analysis of cracked structures. The technique is based on digital image correlation (DIC) combined with an overdetermined algorithm. Design/methodology/approach - The linear overdeterministic algorithm for calculating the SIF based on stress values around the crack tip is applied to a strain field obtained by DIC. Findings - As long as the image quality is sufficiently high, a good accuracy can be obtained for the measured SIF. The crack tip can be automatically detected based on the same strain field. The use of the strain field instead of the displacement field, eliminates problems related to the rigid body motion of the analysed structure. Practical implications - In future works, based on the applied techniques, the SIF of complex cracked plane stress structures can be accurately determined in real engineering applications. Originality/value - The paper demonstrates application of known techniques, refined for other applications, also the use of stress field for SIF overdeterministic calculations. © Emerald Group Publishing Limited.

Language: English

Type (Professor's evaluation): Scientific