{"id":4707,"date":"2026-10-25T22:05:18","date_gmt":"2026-10-25T14:05:18","guid":{"rendered":"https:\/\/www.carbon-fiber-corp.com\/carbon-laminate-poisson-ratio-direction-labels\/"},"modified":"2026-10-25T22:05:18","modified_gmt":"2026-10-25T14:05:18","slug":"carbon-laminate-poisson-ratio-direction-labels","status":"publish","type":"post","link":"https:\/\/www.carbon-fiber-corp.com\/de\/carbon-laminate-poisson-ratio-direction-labels\/","title":{"rendered":"Poisson\u2019s Ratio for a Carbon Laminate: State the Loaded and Transverse Directions"},"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 laminate Poisson\u2019s ratio needs directional labels. Identify the direction being loaded and the transverse strain being measured. Do not copy a single value from a fiber datasheet into every in-plane direction of a different laminate.<\/p><h2>Make the strain pair visible<\/h2><p>On the specimen drawing, show the loading axis and the transverse measurement axis. Retain the strain definition used for the reported ratio. A longitudinal strain trace alone does not supply the transverse response needed for that measurement.<\/p><h2>Keep the test and construction attached<\/h2><p>ASTM D3039 includes Poisson\u2019s ratio among the properties obtainable within its tensile-test scope. Use the applicable method and edition for the actual material. The specimen layup and direction remain essential context; a shared carbon fiber name does not make different laminates equivalent.<\/p><h2>Report the extraction basis<\/h2><p>Ask the laboratory to retain the interval and procedure used to obtain the value, along with the measurement setup. If strain is extracted from optical data, identify the relevant region and axes. Keep a model input traceable to that test record rather than to an unexplained spreadsheet cell. A directional elastic value is useful when its construction and measurement basis remain readable.<\/p><figure><a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b03-09-poisson-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-b03-09-poisson-2.webp\" alt=\"The reported ratio remains attached to its direction pair, laminate and strain-extraction record.\" width=\"1600\" height=\"1000\" loading=\"lazy\" decoding=\"async\"><\/a><figcaption>The reported ratio remains attached to its direction pair, laminate and strain-extraction record. <a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b03-09-poisson-2.webp\">View full size<\/a>.<\/figcaption><\/figure><aside class=\"notes\"><h2>Keep these details together<\/h2><ul><li>Loading and transverse axes<\/li><li>Laminate and specimen construction<\/li><li>Strain measurement and extraction basis<\/li><li>Applicable test record and reported direction<\/li><\/ul><\/aside><p>Further reading: <a href=\"https:\/\/store.astm.org\/standards\/d3039_d3039m\">ASTM D3039: tensile-property method scope<\/a>.<\/p><div class=\"reading\"><p>Related: <a href=\"https:\/\/www.carbon-fiber-corp.com\/carbon-fiber-ply-angle-reference\/\">What Do 0\u00b0, 90\u00b0 and \u00b145\u00b0 Mean in a Carbon Fiber Layup?<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/composite-dsc-residual-cure-reference-basis\/\">DSC Residual Cure in Composites: Keep the Reference Reaction and Sample Basis<\/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\/carbon-laminate-poisson-ratio-direction-labels\/#article\", \"headline\": \"Poisson\u2019s Ratio for a Carbon Laminate: State the Loaded and Transverse Directions\", \"description\": \"Label the loading and transverse directions of a carbon laminate Poisson\u2019s ratio. Retain specimen construction, strain measurement and extraction basis.\", \"image\": [\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b03-09-poisson-1.webp\", \"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261025-b03-09-poisson-2.webp\"], \"datePublished\": \"2026-10-25T14:05:18Z\", \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/www.carbon-fiber-corp.com\/carbon-laminate-poisson-ratio-direction-labels\/\"}, \"author\": {\"@type\": \"Organization\", \"name\": \"Litian Yunde\", \"url\": \"https:\/\/www.carbon-fiber-corp.com\/about\/\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"Dongguan Litian Yunde New Materials Technology Co., Ltd.\", \"url\": \"https:\/\/www.carbon-fiber-corp.com\/\"}, \"inLanguage\": \"en\", \"articleSection\": \"Inspection & Testing\"}<\/script>","protected":false},"excerpt":{"rendered":"<p>A laminate Poisson\u2019s ratio needs directional labels. Identify the direction being loaded and the transverse strain being measured. Do not copy a single value from a fiber datasheet into every in-plane direction of a different laminate.<\/p>","protected":false},"author":1,"featured_media":4675,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Directional Poisson\u2019s Ratio for Carbon Laminates | Litian Yunde","_seopress_titles_desc":"Label the loading and transverse directions of a carbon laminate Poisson\u2019s ratio. 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