Analysis of standard fracture toughness test based on digital image correlation data

0476612 - ÚTAM 2018 RIV GB eng J - Journal Article
Jandejsek, Ivan - Gajdoš, Lubomír - Šperl, Martin - Vavřík, Daniel
Analysis of standard fracture toughness test based on digital image correlation data.
Engineering Fracture Mechanics. Roč. 182, September (2017), s. 607-620. ISSN 0013-7944. E-ISSN 1873-7315
R&D Projects: GA ČR(CZ) GA15-07210S; GA TA ČR(CZ) TE02000162
Keywords : DIC * full-field measurement * J-integral * CTOD * ASTM standard
OECD category: Audio engineering, reliability analysis
Impact factor: 2.580, year: 2017
http://www.sciencedirect.com/science/article/pii/S0013794417305799

This paper deals with an experimental methodology based on the 2D Digital Image Correlation method for precise full-field in-plane stress-strain analysis of a region containing a crack. The presented methodology is employed as a supporting and comparative method for the standard J-integral testing defined by the ASTM. The methodology utilizing the DIC-based displacements for a subsequent evaluation of strain, stress and final extraction of the J-integral from its definition. This J-integral is compared with the value obtained by the ASTM standard and with the value obtained by the DIC-based CTOD measurement. Several techniques improving the conventional DIC and data post-processing are proposed to achieve reliable full-field strain/stress results. A direct comparison between the experimental and FEM full-field results is carried out.
Permanent Link: http://hdl.handle.net/11104/0273079