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 article, an experimental protocol was developed to estimate different terms of the energy balance associated with the fatigue of DP600 steel using two quantitative imaging techniques: digital image correlation provides displacement fields and, after derivation, strain and strain-rate fields.
Abstract: This paper presents an experimental protocol developed to locally estimate different terms of the energy balance associated with the fatigue of DP600 steel. The method involves two quantitative imaging techniques. First, digital image correlation provides displacement fields and, after derivation, strain and strain-rate fields. A variational method, associated with an energy functional, is used to simultaneously identify elastic parameter and stress fields. The deformation energy rate distribution can then be determined on the basis of the stress and strain data. Secondly, infrared thermography provides thermal images which are used to separately estimate the thermoelastic source amplitude and mean dissipation per cycle distributions. The image processing uses a local form of the heat diffusion equation and a special set of approximation functions that take the frequency spectra of the sought sources into account.
44 citations
TL;DR: In this article, a spatial mapping of strain fields within compressed carbon nanotube (CNT) array columns is achieved using digital image correlation (DIC) analysis of in situ scanning electron microscopy (SEM) image sequences.
Abstract: Spatial mapping of strain fields within compressed carbon nanotube (CNT) array columns is achieved using digital image correlation (DIC) analysis of in situ scanning electron microscopy (SEM) image sequences. Full-field displacement and strain maps are generated based upon the motion of the constituent CNTs, which serve as a traceable high-contrast speckle pattern for DIC analysis. The deformation modes and CNT array buckling characteristics vary systematically as a function of column aspect ratio, including bending, crushing, and bottom-up buckle accumulation behaviors. In spite of disparate appearing deformation modes, strain maps indicate that CNT array buckling consistently initiates at 5% local principal strain (ϵ2) for all columns. The ability to quantitatively assess the deformation modes and buckling behavior of CNT arrays at the nanoscale will enable their improved design for high-strain electrical contacts, compliant thermal interfaces, force sensors, energy-absorbing foams, or other applications.
44 citations
TL;DR: In this article, a ductile stainless steel fibrous reinforcing material containing innovative continuous stainless steel fibre filaments with a 30-μm diameter was introduced. And failure modes of these stainless steel fiber layers impregnated with ductile epoxy resin system were reported.
44 citations
TL;DR: In this article, X-ray imaging and strain field mapping demonstrate the degree of heterogeneity in deformation depends on the initial powder density; mesoscale strain field evolution is consistent with softening or hardening manifested by bulk-scale loading curves.
44 citations
TL;DR: In this paper, the authors studied the deformation of Hastelloy X under isothermal conditions using digital image correlation (DIC) and showed that the material exhibits serrated plastic flow behavior between temperatures of 300 °C and 700 °C.
44 citations