A method is presented for extending two-dimensional digital image correlation (DIC) to a higher range of temperatures by using ultraviolet (UV) lights and UV optics minimize the light emitted specimens at those temperatures. The method, which we refer as UV-DIC, compared against DIC unfiltered white filtered blue in past have been used high temperature applications. It shown that low sample glowing not an issue all three methods produce same results. At our experiments, showed significant...

The mechanical behavior of solids in combined high-temperature and vibratory environments, such as those experienced during hypersonic flight, are historically not well explored. In this work on Hastelloy-X plates, elevated temperatures were achieved by induction heating periodic loading was applied using a shaker. Surface displacements strains measured stereo digital image correlation (DIC) the blue spectrum to alleviate issues associated with thermal radiation. Through use decomposition...

Abstract Performing digital image correlation (DIC) at extreme temperatures has been greatly challenging due to the radiation which saturates camera sensor. At such high temperatures, light intensity emitted from an object is occasionally so powerful that acquired images are overwhelmingly saturated. This induces data loss, potentially ruining test, thus requiring user restart test. For this reason, selection of appropriate sensitivity plays a crucial role prior beginning Exposure time...

Digital Image Correlation (DIC) measures full-field strains by tracking displacements of a specimen using images taken before and after deformation. At high temperatures, materials emit light in the form blackbody radiation, which can interfere with DIC images. To screen out that light, has been recently adapted ultraviolet (UV) range cameras, lenses, filters. Before now, UV-DIC had demonstrated at centimeter scale commercially available UV lenses Commercial high-magnification visible have...

Abstract Background High-resolution Digital Image Correlation (DIC) measurements have previously been produced by stitching of neighboring images, which often requires short working distances. Separately, the image processing community has developed super resolution (SR) imaging techniques, improve combining multiple overlapping images. Objective This work investigates novel pairing with digital correlation, as an alternative method to produce high-resolution full-field strain measurements....

Digital Image Correlation (DIC) is a non-contacting, camera-based technique that calculates full-field displacements and strains by comparing digital images taken before after an object deformed. During vibration-based fatigue test, DIC has advantage over strain gages in it non-contacting does not accumulate damage during the test. In this work, was implemented to build strain-velocity calibration curves as alternative gages. First, curve fit applied along free edge of plate using...

Digital Image Correlation (DIC) is a camera-based method of measuring displacement and strain. High-temperature DIC challenging due to light emitted from the sample which can saturate image. This effect be mitigated using optical bandpass filters, but maximum temperature range remains dependent on camera settings. Among settings, bit depth, also referred as color depth or number bits, has received insufficient attention in high-temperature literature. In this work, measurements investigated...

Digital Image Correlation (DIC) is a camera-based method of measuring full-field displacements and strains from the surface deforming object. It can be applied at any length scale (determined by lenses) time camera), because it non-contacting, also used temperatures much higher than withstood bonded strain gauges. At extreme temperatures, materials emit light in form blackbody radiation, which saturate camera sensor. has previously been shown that emitted effectively screened using...

Abstract In vibration-based high cycle fatigue testing, a base-excited plate is driven at frequency resonant mode until failure. one method involving cantilevered square plate, often referred to as the “two-stripe” sometimes used because it exists frequencies and produces large uniaxial bending stresses along free edge that are suitable for testing. The purpose of this work precisely investigate how dimensions more generally rectangular influence performance when two-stripe mode. Included...

This manuscript serves as an addendum to our previous paper, 'Change of Exposure Time Mid-Test in High Temperature DIC Measurement,' published 2020 (Thai et al Meas. Sci. Technol. 31 075402). Since publishing that we have since discovered two sources lighting affect the brightness and contrast high-temperature images differently. While it is broadly understood changes camera sensitivity (for example, by reducing exposure time) produce linear scaling lighting, here show temperature (which...

Stereo digital image correlation (DIC) is a non-contacting technique to obtain full-field displacement and strain fields from the surface of deforming object by comparing images recorded before after deformation. With stereo measurement techniques, out-of-plane measurements are often limited depth field achieved in an image. Tilt-shift photography uses Scheimpflug principle improve rotating plane with respect camera sensor. This implemented using tilt-shift lens mount, which imposes angle...

Planar solid oxide fuel cells are made up of repeating sequences electrolytes, electrodes, seals, and current collectors. The electrolyte should be as thin possible for optimal electrochemical efficiency; however, electrolyte-supported cells, the electrolytes susceptible to damage during production, assembly, operation. To produce that sufficiently mechanically robust, can having a cosintered honeycomb structure supports thin, electrochemically efficient membranes. Use finite element...

The present study explored LGBTQ+ (lesbian, gay, bisexual, transgender, queer, and other non heterosexual/cisgender identities) engineering students' navigation of educational contexts reported the impacts culture on LGBTQ + well-being. Drawing from a sample ten university students in United States, we found that described cultural norms sustained through minimal tolerance for avoidance identity talk or expression. Systemic homogeneous redefine safety expectations while normalizing be silent...

LGBTQ + engineering students in higher education face systemic challenges their educational contexts because of interlocking systems oppression that privilege majority identities. The current study uses thematic analysis to explore graduate and undergraduate students' recommendations for supporting diverse programs. A sample ten college the United States shared effective classroom norms integrating LGBTQ-informed content. Suggestions institutions revolved around increasing feelings safety or...

Abstract Fatigue testing is notoriously slow, requiring many hours to obtain 1 data point on an S-N curve. Such tests can be accelerated somewhat by using vibration-based techniques, which load the order of kHz, such that would traditionally have taken multiple days now completed in a few hours. This work presents novel assembly further accelerate fatigue campaigns loading specimens simultaneously. The has two resonant modes interest. lower frequency mode puts slightly higher strain one...