Abstract
This paper describes a dual 3D Digital Image Correlation (DIC) system application for DLS strain and displacement measurements, where two 3D DIC-systems are used in parallel. The bonded specimens were tested to failure under monotonic loading in a uni-axial tensile testing machine at ambient temperature. Both surface in- plane strain and full-field displacement values were recorded using two DIC systems: high speed (HS) and high resolution (HR). The HS system was used in a parallel setup with the HR system in order to detect the initial failure location and crack propagation rate during the brittle failure mechanism, where an interface crack is propagating between the straps and the inner adherent. Using two inherently different DIC systems involve a number of problems. This involves synchronization of the HS and HR systems, a common illumination level and speckle pattern. This paper therefore describes guidelines for a mutual system setup, applied in an experimental study of steel/epoxy DLS joints under pure tension.
Highlights
In the marine industry there is future potential for adhesives in various types of constructions which include super-structures for ships and offshore platforms as well as their application in connection with patch repair of cracks and corroded areas within the structure [1]
The results so far show that the use of ultra high strength steel/high strength steel could be a disadvantage when other practical design and operational issues are neglected. 4.2 Strain measurements The strain gauge data logged from SG2 were compared with Digital Image Correlation (DIC) measurements at approximately the same vertical location
The combined stiffness of the outer adherends is larger than that of the inner adherend, such that the largest load transfer happens through the bondline at the free ends of the outer adherends, i.e. the crack propagation initiates where the critical peel and shear stresses appear from a theoretical point of view [1,4,5]
Summary
In the marine industry there is future potential for adhesives in various types of constructions which include super-structures for ships and offshore platforms as well as their application in connection with patch repair of cracks and corroded areas within the structure [1]. The aim of following paper is (a) to provide a quick guide to the application of a stereo 3D Digital Image Correlation (DIC) system setup to measure full-field 3D displacement and 2D strain fields at a specimen surface while undergoing testing, where two 3D DIC-systems are applied in parallel, (b) to describe the failure of the test specimens and (c) to shortly present results of the DLS-tests
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