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: It is proposed to use digital image correlation to calculate the distortion fields of a camera lens using a parametric description of the distortion field and a non-parametric model based upon splines to reduce the degrees of freedom required to describe optical distortions.
42 citations
TL;DR: In this paper, the authors presented a new methodology for the identification of a zone cohesive model that describes material failure, which was conducted at the micron scale in order to capture and analyze the fracture mechanism.
Abstract: We present a new methodology for the identification of a zone cohesive model that describes material failure. The material under consideration fails by crazing. The study is conducted at the micron scale in order to capture and analyze the fracture mechanism. The crack tip displacement fields are measured optically by Digital Image Correlation. The local stress intensity factors (model I and II) and the location of the equivalent elastic crack tip are calculated during the loading. The variation of the location of the equivalent crack tip is used to track the initiation and growth of the process zone, up to the onset of crack propagation. These experimental measurements are used to define the appropriate parameters in a cohesive zone model. The methodology addresses the onset of crazing, the traction separation profile and the maximum opening corresponding to the local nucleation of a crack. The cohesive parameters that are derived from the experimental data are consistent with results available in the literature. In addition, the model enables the characterization of the normal and tangential mode of the cohesive model.
42 citations
Patent•
13 Jul 2005TL;DR: In this article, an imaging system consisting of an optical (visible-light or near IR) imaging system and a microwave imaging system is described. And the optical imaging system captures an optical image of the object, produces optical image data representing the optical image and extracts optical image information from the optical data.
Abstract: An imaging system includes an optical (visible-light or near IR) imaging system and a microwave imaging system. The optical imaging system captures an optical image of the object, produces optical image data representing the optical image and extracts optical image information from the optical image data. The microwave imaging system produces microwave image data representing a microwave image of the object in response to the optical image information.
42 citations
TL;DR: In this article, the fracture behavior of a cast AlSi9MgMn aluminium alloy was investigated using a modified Arcan test set-up, where a high-resolution digital camera was used to record a speckle patterned surface of the material.
42 citations
TL;DR: In this paper, the authors used high-speed digital image correlation in vibration analysis of rotating structures and showed that the elimination of rigid body motions leads to a higher accuracy of measurement and provides more pronounced frequency response spectra.
42 citations