{"id":4822,"date":"2021-08-12T15:42:16","date_gmt":"2021-08-12T13:42:16","guid":{"rendered":"http:\/\/elastomer-institut.de\/?post_type=portfolio&#038;p=4822"},"modified":"2022-11-28T12:26:20","modified_gmt":"2022-11-28T11:26:20","slug":"compressive-stress-relaxation","status":"publish","type":"portfolio","link":"https:\/\/elastomer-institut.de\/en\/pruefungen\/compressive-stress-relaxation\/","title":{"rendered":"Compressive Stress Relaxation"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1g50o-df93cc2ba0947e559b7d16703f5a9e82\">\n.avia-section.av-1g50o-df93cc2ba0947e559b7d16703f5a9e82 .av-parallax .av-parallax-inner{\nbackground-repeat:no-repeat;\nbackground-image:url(https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Intro.jpg);\nbackground-position:50% 100%;\nbackground-attachment:scroll;\n}\n.avia-section.av-1g50o-df93cc2ba0947e559b7d16703f5a9e82 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class=\"av-section-color-overlay-wrap\"><div class=\"av-section-color-overlay\"><\/div><a href='#next-section' title='' class='scroll-down-link av-custom-scroll-down-color avia-svg-icon avia-font-svg_entypo-fontello' data-av_svg_icon='down-open-mini' data-av_iconset='svg_entypo-fontello'><svg version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"15\" height=\"32\" viewBox=\"0 0 15 32\" preserveAspectRatio=\"xMidYMid meet\" aria-labelledby='av-svg-title-1' aria-describedby='av-svg-desc-1' role=\"graphics-symbol\" aria-hidden=\"true\">\n<title id='av-svg-title-1'>Scroll to next section<\/title>\n<desc id='av-svg-desc-1'>Scroll to next section<\/desc>\n<path d=\"M12.96 12.16q0.704-0.832 1.536 0 0.832 0.704 0 1.536l-6.272 6.144q-0.704 0.704-1.536 0l-6.272-6.144q-0.832-0.832 0-1.536 0.768-0.768 1.6 0l5.44 4.992z\"><\/path>\n<\/svg><\/a><div class='container av-section-cont-open' ><main  role=\"main\" itemprop=\"mainContentOfPage\"  class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-4822'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-vqg8-0fbd2b24b540e5c55596e312e074b98b\">\n.flex_column.av-vqg8-0fbd2b24b540e5c55596e312e074b98b{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-vqg8-0fbd2b24b540e5c55596e312e074b98b av_one_full  avia-builder-el-1  avia-builder-el-no-sibling  first flex_column_div av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ksu60x1h-db85e8c03458a1b2900d61dbe38d56c7\">\n#top .av-special-heading.av-ksu60x1h-db85e8c03458a1b2900d61dbe38d56c7{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-ksu60x1h-db85e8c03458a1b2900d61dbe38d56c7 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-ksu60x1h-db85e8c03458a1b2900d61dbe38d56c7 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-ksu60x1h-db85e8c03458a1b2900d61dbe38d56c7 av-special-heading-h1 blockquote modern-quote modern-centered  avia-builder-el-2  avia-builder-el-no-sibling '><h1 class='av-special-heading-tag '  itemprop=\"headline\"  >Compressive Stress Relaxation<\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div>\n\n<\/div><\/div><\/main><!-- close content main element --><\/div><\/div><\/div><div id='av_section_2'  class='avia-section av-1f6ls-2086bebd1c99d72deef9786cb38f3f73 alternate_color avia-section-large avia-no-border-styling  avia-builder-el-3  el_after_av_section  el_before_av_section  small-intro avia-bg-style-scroll container_wrap fullsize'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-4822'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-vqg8-6-629bcb1e0adc92d8ea1e65f2907f6666\">\n.flex_column.av-vqg8-6-629bcb1e0adc92d8ea1e65f2907f6666{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-vqg8-6-629bcb1e0adc92d8ea1e65f2907f6666 av_one_full  avia-builder-el-4  el_before_av_one_half  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ksua3d6g-f76600b13d2132faf74cdb53b59f9608\">\n#top .av-special-heading.av-ksua3d6g-f76600b13d2132faf74cdb53b59f9608{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-ksua3d6g-f76600b13d2132faf74cdb53b59f9608 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-ksua3d6g-f76600b13d2132faf74cdb53b59f9608 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-ksua3d6g-f76600b13d2132faf74cdb53b59f9608 av-special-heading-h2 blockquote modern-quote modern-centered  avia-builder-el-5  avia-builder-el-no-sibling '><h2 class='av-special-heading-tag '  itemprop=\"headline\"  >Significance and Test Method<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-vqg8-5-20aea29303437a8a144c9c40505c80e4\">\n.flex_column.av-vqg8-5-20aea29303437a8a144c9c40505c80e4{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-vqg8-5-20aea29303437a8a144c9c40505c80e4 av_one_half  avia-builder-el-6  el_after_av_one_full  el_before_av_one_half  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-kkxx73rg-4887e18e34d25eb9f5a6c84405a7ba68 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"text-align: left\">When an elastomer is compressed through external force, it generates a reaction force, sometimes referred to as the sealing force. Over time, with constant deformation, the internal tensions in the material decrease, causing the elastic restoring force of the rubber material to diminish. This reduction in sealing force is also called compressive stress relaxation (CSR).<\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-vqg8-4-333bde5f3f23a84ed7905610e621ec83\">\n.flex_column.av-vqg8-4-333bde5f3f23a84ed7905610e621ec83{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-vqg8-4-333bde5f3f23a84ed7905610e621ec83 av_one_half  avia-builder-el-8  el_after_av_one_half  avia-builder-el-last  flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-kkxx73rg-3-7715886b942cf5c5a5af0040bcd8668e '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>The causes of this stress relaxation are ageing processes inside the material (=irreversible loss) as well as a temperature-dependent physical relaxation of the chain molecules until they have reached their thermodynamic state of equilibrium (=reversible loss of sealing force). Compared to the compression set test, the compressive stress relaxation test does not evaluate the recovery behaviour after relaxation, but the retention of the sealing force at constant deformation.<\/p>\n<\/div><\/section><\/div><\/div><\/div><\/div><!-- close content main div --><\/div><\/div><div id='av_section_3'  class='avia-section av-klm050jf-cc76fc5cec97c88aeb28140595ad217b alternate_color avia-section-large avia-no-border-styling  avia-builder-el-10  el_after_av_section  avia-builder-el-last  img-text-section no-padding-top avia-bg-style-scroll container_wrap fullsize'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-4822'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1qtfk-6edde0e630ee4a172f87280333261f4f\">\n@keyframes av_boxShadowEffect_av-1qtfk-6edde0e630ee4a172f87280333261f4f-column {\n0%   { box-shadow:  0 0 0 0 rgba(164,164,164,0.4); opacity: 1; }\n100% { box-shadow:  0 0 25px 0 rgba(164,164,164,0.4); opacity: 1; }\n}\n.flex_column.av-1qtfk-6edde0e630ee4a172f87280333261f4f{\nbox-shadow: 0 0 25px 0 rgba(164,164,164,0.4);\nborder-radius:0px 0px 0px 0px;\npadding:60px 60px 60px 60px;\n}\n<\/style>\n<div  class='flex_column av-1qtfk-6edde0e630ee4a172f87280333261f4f av_one_half  avia-builder-el-11  el_before_av_one_half  avia-builder-el-first  first no_margin flex_column_div shadow-not-animated  '     ><section  class='av_textblock_section av-kkxx73rg-2-22e2fbc9f5b4de468381f565ebefa4eb '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h4>Significance for Application Technology<\/h4>\n<p>The determined compressive stress relaxation can be used to show the relaxation behaviour, i.e. the reduction of tension under load and performance potential of sealing materials. Generally, this is used to show the long-term behaviour of the material at the upper temperature limit, or a service life curve is created from it on the basis of tests at different temperatures.<\/p>\n<h4>The Compressive Stress Relaxation Test<\/h4>\n<p>(DIN) ISO 3384-1 describes two methods for determining stress relaxation under pressure. In addition, the American SAE J 2979 also defines tests for compressive stress relaxation.<\/p>\n<p>An elastomer specimen is compressed with a constant load and the force it exerts against this external influence is measured. Compressive stress relaxation describes the loss of restoring force of the material and is expressed as a percentage of the initial opposing force.<\/p>\n<p>This force measurement is done either <em>continuously<\/em> or <em>discontinuously<\/em>, depending on the method. The constant measurement of the restoring force is more practical and therefore most commonly used. In some cases, however, for example for examinations in media at temperatures above the boiling point, the restoring force can only be recorded at certain points in time, which means discontinuously. This requires a more complex measurement of the deformation force, but does not require such expensive testing equipment as for continuous measurement. However, the results of the different measurements correlate and are absolutely comparable.<\/p>\n<p>The compressive stress relaxation test is much more complex to perform than a compression set test and is therefore less suitable for finished parts. We carry out both the continuous (normal case) and the discontinuous (special case) test.<\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1qtfk-1-93accaf3f3bb464a80600e4ae9185cbd\">\n@keyframes av_boxShadowEffect_av-1qtfk-1-93accaf3f3bb464a80600e4ae9185cbd-row {\n0%   { box-shadow:  0 0 0 0 rgba(164,164,164,0.4); opacity: 1; }\n100% { box-shadow:  0 0 25px 0 rgba(164,164,164,0.4); opacity: 1; }\n}\n@keyframes av_boxShadowEffect_av-1qtfk-1-93accaf3f3bb464a80600e4ae9185cbd-column {\n0%   { box-shadow:  0 0 0 0 rgba(164,164,164,0.4); opacity: 1; }\n100% { box-shadow:  0 0 25px 0 rgba(164,164,164,0.4); opacity: 1; }\n}\n.flex_column_table.av-equal-height-column-flextable.av-1qtfk-1-93accaf3f3bb464a80600e4ae9185cbd{\nbox-shadow: 0 0 25px 0 rgba(164,164,164,0.4);\n}\n.flex_column.av-1qtfk-1-93accaf3f3bb464a80600e4ae9185cbd{\nbox-shadow: 0 0 25px 0 rgba(164,164,164,0.4);\nborder-radius:0px 0px 0px 0px;\npadding:0 0 0 0;\n}\n<\/style>\n<div  class='flex_column av-1qtfk-1-93accaf3f3bb464a80600e4ae9185cbd av_one_half  avia-builder-el-13  el_after_av_one_half  avia-builder-el-last  no_margin flex_column_div shadow-not-animated av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-12pj4-f5b23568f05f9a2732bf987dcd3000ce\">\n.avia-image-container.av-12pj4-f5b23568f05f9a2732bf987dcd3000ce img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-12pj4-f5b23568f05f9a2732bf987dcd3000ce .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-12pj4-f5b23568f05f9a2732bf987dcd3000ce av-styling- avia-align-center  avia-builder-el-14  avia-builder-el-no-sibling '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-3611 avia-img-lazy-loading-not-3611 avia_image ' src=\"https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Prueffeld.jpg\" alt='' title='Druckspannungsrelaxation-Pr\u00fcffeld'  height=\"840\" width=\"1200\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Prueffeld.jpg 1200w, https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Prueffeld-300x210.jpg 300w, https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Prueffeld-1030x721.jpg 1030w, https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Prueffeld-768x538.jpg 768w, https:\/\/elastomer-institut.de\/wp-content\/uploads\/2021\/08\/Druckspannungsrelaxation-Prueffeld-705x494.jpg 705w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/div><\/div><\/div><\/div>\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Based on the determined compressive stress relaxation, the relaxation behaviour, which means the decrease of tension under load and performance of sealing materials, can be shown.<\/p>\n","protected":false},"author":2,"featured_media":3602,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"footnotes":""},"tags":[],"portfolio_entries":[29],"class_list":["post-4822","portfolio","type-portfolio","status-publish","has-post-thumbnail","hentry","portfolio_entries-basic-properties"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - 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