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Determination of Stress Intensity Factor for Cracks in Orthotropic Composite Materials using Digital Image Correlation
Author(s) -
Mogadpalli G. P.,
Parameswaran V.
Publication year - 2008
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2007.00391.x
Subject(s) - orthotropic material , digital image correlation , displacement (psychology) , displacement field , materials science , stress intensity factor , composite material , stress field , composite number , enhanced data rates for gsm evolution , intensity (physics) , fracture (geology) , field (mathematics) , ultimate tensile strength , stress (linguistics) , structural engineering , fracture mechanics , optics , mathematics , engineering , finite element method , physics , psychology , telecommunications , linguistics , philosophy , pure mathematics , psychotherapist
This paper focuses on the application of the digital image correlation (DIC) technique to determine the stress intensity factor (SIF) for cracks in orthotropic composites. DIC is a full‐field technique for measuring the surface displacements of a deforming object and can be applied to any type of material. To determine the SIF from full‐field displacement data, the asymptotic expansion of the crack‐tip displacement field is required. In this paper the expansion of the crack tip displacement field is derived from an existing solution for strain fields. Unidirectional fibre composite panels with an edge crack aligned along the fibre were tested under remote tensile loading and the displacements were recorded using DIC. The SIF was calculated from the experimental data by fitting the theoretical displacement field using the least squares method. The SIF thus determined was in good agreement with theoretical results and therefore demonstrates the applicability of the derived displacement field and DIC technique for studying fracture in composites.