{"id":7809,"date":"2026-03-19T09:48:40","date_gmt":"2026-03-19T01:48:40","guid":{"rendered":"http:\/\/www.camcjsw-testmachines.com\/?p=7809"},"modified":"2026-03-19T09:53:17","modified_gmt":"2026-03-19T01:53:17","slug":"industry-standard-plastics-astm-d2412","status":"publish","type":"post","link":"http:\/\/www.camcjsw-testmachines.com\/ru\/industry-standard-plastics-astm-d2412\/","title":{"rendered":"Industry Standard &#8211; Plastics &#8211; ASTM D2412"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7809\" class=\"elementor elementor-7809\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f4743a3 e-flex e-con-boxed e-con e-parent\" data-id=\"f4743a3\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3264c40 elementor-widget elementor-widget-heading\" data-id=\"3264c40\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.22.0 - 26-06-2024 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h4 class=\"elementor-heading-title elementor-size-default\">Ring Stiffness, Ring Flexibility testing<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b5ebac1 elementor-widget elementor-widget-text-editor\" data-id=\"b5ebac1\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.22.0 - 26-06-2024 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>As to ISO 9969 or ASTM D2412, initial ring stiffness or ring stiffness characterizes the resistance of a pipe section to radial compressive forces. The measurement occurs at low deformations of 3%.\u00a0As to\u00a0ISO 13968, it\u00a0describes the ability of a pipe to withstand deformation without undergoing structural damage. The test arrangement is similar to the test arrangement for measuring ring stiffness, however deformations of 30% are applied.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-88118d4 e-flex e-con-boxed e-con e-parent\" data-id=\"88118d4\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e3c3444 elementor-widget elementor-widget-heading\" data-id=\"e3c3444\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Ring Stiffness calculation<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2997a6b elementor-widget elementor-widget-text-editor\" data-id=\"2997a6b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A ring stiffness test machine calculates ring stiffness by measuring the radial force and vertical deflection of a pipe sample under controlled compression, then applying a standard formula to compute the stiffness value.<\/p><p>The machine records two key values in real time:<\/p><p>\u00a0\u00a0&#8211; Force (F): Measured by a load cell (units: kN).<\/p><p>\u00a0\u00a0&#8211; Deflection (\u0394Y): Measured by a displacement sensor (units: m).<\/p><p>Calculation is based on the force at 3% diametric deflection (\u0394Y = 0.03\u202fd, where d is the pipe diameter).<\/p><p>Formula: S\u2248F\/(\u0394Y*L)\u200b<\/p><ul><li>S = ring stiffness (kN\/m\u00b2)<\/li><li>F = force at 3% deflection (kN)<\/li><li>\u0394Y = vertical deflection (m)<\/li><li>d = pipe inner diameter (m)<\/li><li>L = effective length of the sample (m)<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a62452f e-flex e-con-boxed e-con e-parent\" data-id=\"a62452f\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7dc19fd elementor-widget elementor-widget-heading\" data-id=\"7dc19fd\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Testing procedure (to ISO 9969)<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ea31d6 elementor-widget elementor-widget-text-editor\" data-id=\"4ea31d6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Compressive\u00a0testing machine,\u00a0capable of\u00a0a constant\u00a0rate of cross-head\u00a0movement,\u00a0via a pair of parallel plates,\u00a0as appropriate to the nominal diameter of the\u00a0pipe in\u00a0conformance\u00a0with Table1 with sufficient force and travel to produce the specified diametric deflection.<\/p><p>\u00a0<\/p><p><img decoding=\"async\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D2412-1.webp\" alt=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D2412-1.webp\" \/><br \/><img decoding=\"async\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D2412-2.webp\" alt=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D2412-2.webp\" \/><br \/>NOTE:<\/p><p>Structured wall pipes with perpendicular ribs,\u00a0corrugations or other regular structures shall be cut such that each test piece contains a\u00a0whole number of\u00a0ribs,\u00a0corrugations or other structures.\u00a0The cuts shall\u00a0be made at\u00a0the\u00a0mid point between the ribs,\u00a0corrugations or other structures.<\/p><p>The length of\u00a0the test pieces shall be\u00a0the minimum\u00a0whole number of\u00a0ribs,\u00a0corrugations or other structures resulting\u00a0in\u00a0a\u00a0length\u00a0of\u00a0290mm\u00a0or\u00a0greater\u00a0or,\u00a0for\u00a0pipes greater than\u00a01500mm,\u00a00.2d<sub>n<\/sub>\u00a0or greater.<img decoding=\"async\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D2412-3.webp\" alt=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/03\/ASTM-D2412-3.webp\" \/><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1dada02 e-flex e-con-boxed e-con e-parent\" data-id=\"1dada02\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5960530 elementor-widget elementor-widget-heading\" data-id=\"5960530\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Ring flexibility to DIN EN ISO 13968<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf445b4 elementor-widget elementor-widget-text-editor\" data-id=\"cf445b4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It describes the ability of a pipe to withstand deformation without undergoing structural damage. The measurement is performed in the same test arrangement as for ring stiffness. According to ISO 13968, the test is run until the pipe fails or until deformation of 30% of the outer diameter of the pipe is reached. The results of the test are maximum values of force and deformation, or force and deformation values in which a damage criterion defined in the standard occurs for the first time.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Ring Stiffness, Ring Flexibility testing As to ISO 9969 or ASTM D2412, initial ring stiffness or ring stiffness characterizes the resistance of a pipe section to radial compressive forces. The measurement occurs at low deformations of 3%.\u00a0As to\u00a0ISO 13968, it\u00a0describes the ability of a pipe to withstand deformation without undergoing structural damage. The test arrangement [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[41],"tags":[],"class_list":["post-7809","post","type-post","status-publish","format-standard","hentry","category-application"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.5 (Yoast SEO v22.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Industry Standard - Plastics - ASTM D2412 - SINOTEST, a brand of JIANGSU WALLONG-HSIN MACHINERY ENGINEERING CORPORATION LTD<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"http:\/\/www.camcjsw-testmachines.com\/ru\/industry-standard-plastics-astm-d2412\/\" \/>\r\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Industry Standard - Plastics - ASTM D2412\" \/>\r\n<meta property=\"og:description\" content=\"Ring Stiffness, Ring Flexibility testing As to ISO 9969 or ASTM D2412, initial ring stiffness or ring stiffness characterizes the resistance of a pipe section to radial compressive forces. 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