{"id":4646,"date":"2026-10-25T17:39:10","date_gmt":"2026-10-25T09:39:10","guid":{"rendered":"https:\/\/www.carbon-fiber-corp.com\/composite-dic-strain-region-coordinate-definition\/"},"modified":"2026-10-25T17:39:10","modified_gmt":"2026-10-25T09:39:10","slug":"composite-dic-strain-region-coordinate-definition","status":"publish","type":"post","link":"https:\/\/www.carbon-fiber-corp.com\/zh\/composite-dic-strain-region-coordinate-definition\/","title":{"rendered":"Digital Image Correlation on Composites: Show Where the Reported Strain Came From"},"content":{"rendered":"<style>.ly-note{max-width:880px;margin:0 auto;color:#26333c;line-height:1.85;font-size:17px}.ly-note h2{font-size:1.5rem;line-height:1.35;margin:1.8em 0 .6em}.ly-note p{margin:0 0 1.2em}.ly-note .intro{font-size:1.08em}.ly-note figure{margin:2em 0}.ly-note figure img{display:block;width:100%;height:auto}.ly-note figcaption{font-size:.88rem;color:#60727d;line-height:1.55;margin-top:10px}.ly-note ul{padding-left:1.4em}.ly-note li{margin:.45em 0}.ly-note a{color:#8e1e34;text-decoration:underline;text-underline-offset:3px}.ly-note .notes{padding:20px 28px;background:#f0f4f5;border-left:3px solid #296c85;margin:2em 0}.ly-note .notes h2{font-size:1.1rem;margin:0 0 .8em}.ly-note .reading{border-top:1px solid #d9e1e5;margin-top:2em;padding-top:1.1em}.single-post .entry-title{font-size:clamp(1.8rem,3.8vw,2.6rem);line-height:1.25}.single-post .post-thumb-img-content img{width:100%;height:auto;max-height:360px;object-fit:contain;background:#fbfcfc}@media(max-width:600px){.ly-note{font-size:16px}.ly-note h2{font-size:1.3rem}.ly-note .notes{padding:17px}}<\/style><div class=\"ly-note\"><p class=\"intro\">A strain value from digital image correlation needs its direction and evaluated region. A coloured field does not identify the region used for a reported average. Keep the original images, coordinate definition and processing settings with the test result.<\/p><h2>Locate the evaluated area<\/h2><p>Mark the area of interest on the specimen image. If a smaller region or virtual gauge supplies the reported value, locate that too. The DICe tutorial distinguishes full-field analysis from its subset and virtual-strain-gauge settings; these are part of the measurement definition.<\/p><h2>Make the axes readable<\/h2><p>State which strain component is plotted and how the image axes relate to the specimen. A maximum at one location and an average over a selected area answer different questions. Keep the displayed scale and the processing stage attached to any exported picture.<\/p><h2>Preserve changes to the analysis<\/h2><p>If the region or settings change during review, retain which output belongs to which analysis. Do not overwrite the only copy of the earlier result. Agreement between two screenshots is not enough when their averaging areas differ. The test report should let a reviewer locate the measured area and understand how the published value was extracted from the underlying image sequence.<\/p><figure><a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b02-09-dic-2.webp\" aria-label=\"Open the full-size diagram\"><img src=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b02-09-dic-2.webp\" alt=\"A strain component remains linked to the selected region, image sequence and processing definition.\" width=\"1600\" height=\"1000\" loading=\"lazy\" decoding=\"async\"><\/a><figcaption>A strain component remains linked to the selected region, image sequence and processing definition. <a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b02-09-dic-2.webp\">View full size<\/a>.<\/figcaption><\/figure><aside class=\"notes\"><h2>Keep these details together<\/h2><ul><li>Specimen and evaluated region<\/li><li>Coordinate axes and strain component<\/li><li>Subset, gauge and processing settings<\/li><li>Image sequence and output identity<\/li><\/ul><\/aside><p>Further reading: <a href=\"https:\/\/dicengine.github.io\/dice\/md__d_i_ce__tutorial.html\">Sandia DICe: regions and processing definitions<\/a>.<\/p><div class=\"reading\"><p>Related: <a href=\"https:\/\/www.carbon-fiber-corp.com\/composite-test-speed-crosshead-strain\/\">Composite Test Speed: Crosshead Motion Is Not a Strain Measurement<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/composite-flexure-support-span-overall-length\/\">Composite Flexure Specimens: Support Span Is Not the Overall Length<\/a>.<\/p><p><a href=\"https:\/\/www.carbon-fiber-corp.com\/contact\/\">Discuss your component with Litian Yunde<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/carbon-fiber-guides\/\">Browse the component guides<\/a><\/p><\/div><\/div><script type=\"application\/ld+json\" class=\"ly-article-schema\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BlogPosting\", \"@id\": \"https:\/\/www.carbon-fiber-corp.com\/composite-dic-strain-region-coordinate-definition\/#article\", \"headline\": \"Digital Image Correlation on Composites: Show Where the Reported Strain Came From\", \"description\": \"Locate the region and coordinate direction behind a composite DIC strain value. 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