Topic
Digital image correlation
About: Digital image correlation is a research topic. Over the lifetime, 7842 publications have been published within this topic receiving 132166 citations.
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TL;DR: In this paper, the effect of aggregate size and volume on the non-uniform strain distribution in concrete, drying shrinkage of mortar and concretes were determined with 3D digital image correlation (3D-DIC).
Abstract: To elucidate the effect of aggregate size and volume on the non-uniform strain distribution in concrete, drying shrinkage of mortar and concretes were determined with 3D digital image correlation (3D-DIC). The distribution of shrinkage displacements and strains in mortar and concrete were analyzed. The results show that 3D-DIC makes it possible to measure non-uniform displacement distributions initiated by shrinkage in mortar and concrete. The non-uniformity became more remarkable with drying time. The presence of aggregates larger than 5 mm in concrete have locally changed the displacement and strain fields. Aggregates within 5–25 mm make non-uniform strain of concrete more fluctuant, especially when the aggregate size is larger than 10 mm. The maximum and minimum principal strain distributions became more heterogeneous with decreasing volume of aggregates.
52 citations
TL;DR: In this article, an overview of the use of eight different optical methods with hole drilling to determine residual stresses is provided, including brittle and photoelastic coatings, Moire interferometers, holographic interferometry, electronic speckle pattern interferometrics, interferometric strain rosette, digital image correlation and shearography.
Abstract: An overview is provided of the use of eight different optical methods with hole drilling to determine residual stresses. The methods considered are: brittle and photoelastic coatings, Moire interferometry, holographic interferometry, electronic speckle pattern interferometry, interferometric strain rosette, digital image correlation and shearography. A number of applications are summarized, such as the use of hole drilling with holographic interferometry to investigate stresses in rock structures accessed by deep boreholes and to determine manufacturing-induced residual stresses in fillets of small radii.
52 citations
52 citations
TL;DR: An analytical method to calculate the stress intensity factor for cracked steel I-beams under both bending moment and axial load is presented in this paper, which is based on the approach of crack surface widening energy release rate.
52 citations
TL;DR: In this paper, a study has been performed to compare how different methods to locate the crack-tip position from the displacement field around a crack tip obtained by digital image correlation influence the estimation of stress intensity factors.
Abstract: The evaluation of stress intensity factors from experimentally determined crack-tip stress or displacement fields almost always requires that the location of the crack tip is identified beforehand. In this work, a study has been performed to compare how different methods to locate the crack-tip position from the displacement field around a crack tip obtained by digital image correlation influence the estimation of stress intensity factors. The methods used were two constrained Newton type methods: the trust-region reflective Newton method and quasi-Newton method; an unconstrained direct search method: the Nelder–Mead Simplex method; a constrained genetic algorithm; and a constrained Pattern Search (PS) method. It is shown that the Newton type methods are less accurate compared with the direct search methods studied. The PS method was found to be the most accurate. Furthermore, the PS method was found to be about twice as fast as the Simplex method and 10 times faster than a Genetic Algorithm for the same computing hardware and the same input data.
52 citations