Koko, A; Becker, T H (2024) Mixed-mode fracture: Combination of Arcan fixture and stereo-DIC. Theoretical and Applied Fracture Mechanics Part B, 134. 104724

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Abstract

To characterise mixed-mode fracture, including mode III, stereo digital image correlation (DIC) has proven valuable for measuring in-plane and out-of-plane surface displacement and deformation fields while allowing for direct stress intensity factor (SIF) extraction. Using an Arcan fixture, that offers both in-plane and out-of-plane loading, and stereo DIC the mixed mode fracture behaviour of Polymethyl methacrylate (PMMA) is analysed using a mode decomposition technique that combines experimental and analytical approaches. This technique divides the displacement field into three distinct components: a symmetric field (uI ), an in-plane anti-symmetric field (uII ), and an out-of-plane antisymmetric field (uIII ); the mode of interest was decomposed by a sum or difference operation on the reflected and non-reflected fields about the crack plane. The calculated SIFs measured during stable crack growth were normalised using different fracture toughness (KIC ) values with KIC of 1.82 ± 0.32 MPa m0.5 providing the best fit to fracture loci with an R2 of 0.95. This value agrees well with the ASTM (compact tension geometry) obtained value of 1.7 MPa m0.5.

Item Type:	Article
Keywords:	Arcan fixture; J-integral; Crack growth; Stereo DIC; Stress intensity factor
Subjects:	Advanced Materials > Mechanical Measurement
Divisions:	Materials and Mechanical Metrology
Identification number/DOI:	10.1016/j.tafmec.2024.104724
Last Modified:	27 Nov 2024 13:25
URI:	https://eprintspublications.npl.co.uk/id/eprint/10102