{"id":6641,"date":"2024-06-09T12:52:06","date_gmt":"2024-06-09T10:52:06","guid":{"rendered":"https:\/\/blog.federnshop.com\/types-of-stress-compression-springs\/"},"modified":"2024-06-12T11:33:48","modified_gmt":"2024-06-12T09:33:48","slug":"types-of-stress-compression-springs","status":"publish","type":"post","link":"https:\/\/blog.federnshop.com\/en\/types-of-stress-compression-springs\/","title":{"rendered":"Types of stress compression springs"},"content":{"rendered":"<p>Before interpreting the<a href=\"https:\/\/blog.federnshop.com\/en\/information-compression-springs\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Compression spring<\/a> It should basically be clarified whether the intended type of stress is static, quasi-static or dynamic.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.federnshop.com\/en\/types-of-stress-compression-springs\/#Static_or_quasi-static_stress\" >Static or quasi-static stress<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.federnshop.com\/en\/types-of-stress-compression-springs\/#Dynamic_stress\" >Dynamic stress<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Static_or_quasi-static_stress\"><\/span>Static or quasi-static stress<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Time-constant (resting) load or time-changing load with less than 10,000 strokes in total or small stroke stresses of up to 0.1 x fatigue strength (\u03c4kh = \u03c4k2 -\u03c4k1).<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Dynamic_stress\"><\/span>Dynamic stress<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Dynamic stress in springs is defined as stress that changes over time with more than 10,000 load changes or stroke stresses over 0.1 x fatigue strength (\u03c4kh) with constant and variable stroke stress. The spring is mostly pretensioned and exposed to periodic swell loads with a sinusoidal curve that occur randomly (stochastically), as is the case with vehicle suspension.<\/p>\n<p><span style=\"text-decoration: underline;\">Depending on the required number of load cycles &#8220;N&#8221; without break, one differentiates:<\/span><\/p>\n<p>1. The area of<a title=\"Dauerfestigkeit Wikipedia\" href=\"https:\/\/blog.federnshop.com\/en\/fatigue-strength\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Fatigue strength<\/a> with number of load cycles<br \/>\nN \u2265 10<sup> 7th<\/sup> for cold-formed springs<br \/>\nN \u2265 2 x 10<sup> 6th<\/sup> for thermoformed springs<br \/>\nWith stroke voltage less than fatigue strength.<\/p>\n<p>2. The area of<a title=\"Zeitfestigkeit Wikipedia\" href=\"http:\/\/de.wikipedia.org\/wiki\/W%C3%B6hlerversuch\" target=\"_blank\" rel=\"noopener noreferrer\"> Fatigue strength<\/a> with number of load cycles<br \/>\nN&lt; 10<sup> 7th<\/sup> for cold-formed springs<br \/>\nN&lt; 2 x 10<sup> 6th<\/sup> for thermoformed springs<br \/>\nWith stroke voltage greater than endurance stroke strength and less than time stroke strength.<\/p>\n<p>The existing shear stress is determined as follows.<\/p>\n<p>Shear stress from force: <span class=\"katex-eq\" data-katex-display=\"false\">\\Large \\tau=\\frac{8DF}{\\pi d^{3}}<\/span><\/p>\n<p>Shear stress from path: <span class=\"katex-eq\" data-katex-display=\"false\">\\Large \\tau=\\frac{Gds}{\\pi nD^{2}}<\/span><\/p>\n<figure id=\"attachment_6644\" aria-describedby=\"caption-attachment-6644\" style=\"width: 600px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Formelzeichen_Druckfedern_komplett.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6644 size-full\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Schwingungsschaubild_dynamisch.jpg\" alt=\"Vibration diagram compression spring dynamic\" width=\"600\" height=\"372\" data-wp-pid=\"1762\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Schwingungsschaubild_dynamisch.jpg 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Schwingungsschaubild_dynamisch-300x186.jpg 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Schwingungsschaubild_dynamisch-200x124.jpg 200w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Schwingungsschaubild_dynamisch-400x248.jpg 400w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption id=\"caption-attachment-6644\" class=\"wp-caption-text\">Vibration diagram compression spring dynamic<\/figcaption><\/figure>\n<p><a href=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Formelzeichen_Druckfedern_komplett.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Description Formula symbol compression springs [PDF]<\/a><\/p>\n<p>For dynamically loaded compression springs, the corrected shear stress applies due to the resulting increase in stress. With the tension correction factor k, which depends on the winding ratio (ratio of mean diameter to wire thickness) of the spring, the highest tension can be approximately determined.<\/p>\n<p style=\"text-align: left;\"><strong>Corrected shear stress<\/strong> :<\/p>\n<p style=\"text-align: left;\">\u03c4k1 = k \u00b7 \u03c41<u>&lt;<\/u> \u03c4ko<\/p>\n<p style=\"text-align: left;\">\u03c4k2 = k \u00b7 \u03c42<span style=\"text-decoration: underline;\">&lt;<\/span> \u03c4ko<\/p>\n<p style=\"text-align: left;\">where for k applies (according to Bergstr\u00e4sser)<\/p>\n<p style=\"text-align: left;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\Large k=\\frac{\\frac{D}{d}+0,5}{\\frac{D}{d}-0,75}<\/span><\/p>\n<p>The permissible upper stress \u03c4ko for each type of spring material is read from the fatigue strength diagram (Goodman diagram) from DIN EN 13906-1 (Fig. 12 to Fig. 22).<\/p>\n<p>The desired working stroke must not exceed the fatigue strength (\u03c4kh):<\/p>\n<p style=\"text-align: left;\">\u03c4kh = \u03c4k2 &#8211; \u03c4k1<u>&lt;<\/u> \u03c4khzul<\/p>\n<p style=\"text-align: left;\">With the<a href=\"https:\/\/www.federnshop.com\/de\/service-und-informationen\/federberechnung-nach-din-13906.html\" target=\"_blank\" rel=\"noopener noreferrer\"> Gutekunst spring calculation program WinFSB<\/a> every calculated compression spring can also be calculated for the dynamic application. All you have to do is activate the option &#8220;permanent&#8221; and &#8220;shot peened&#8221;. The dynamic values and the Goodman diagram are then displayed under the &#8220;Stress&#8221; area.<\/p>\n<figure id=\"attachment_6642\" aria-describedby=\"caption-attachment-6642\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.federnshop.com\/de\/service_informationen\/federnberechnung_din.html\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6642 size-medium\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/\/Goodman-Diagramm_Druckfeder_dauerfest-300x244.png\" alt=\"Graphic WinFSB permanent\" width=\"300\" height=\"244\" data-wp-pid=\"759\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Goodman-Diagramm_Druckfeder_dauerfest-300x244.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Goodman-Diagramm_Druckfeder_dauerfest-200x163.png 200w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Goodman-Diagramm_Druckfeder_dauerfest.png 589w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-6642\" class=\"wp-caption-text\">Goodman diagram WinFSB durable<\/figcaption><\/figure>\n<figure id=\"attachment_6643\" aria-describedby=\"caption-attachment-6643\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.federnshop.com\/de\/service_informationen\/federnberechnung_din.html\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6643 size-medium\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/\/Goodman-Diagramm_Druckfeder_nicht_dauerfest-300x246.png\" alt=\"Graphics WinFSB not permanent\" width=\"300\" height=\"246\" data-wp-pid=\"760\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Goodman-Diagramm_Druckfeder_nicht_dauerfest-300x246.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Goodman-Diagramm_Druckfeder_nicht_dauerfest.png 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Goodman-Diagramm_Druckfeder_nicht_dauerfest-200x164.png 200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-6643\" class=\"wp-caption-text\">Goodman diagram not permanent<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/EusjLYwYpLE\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p><strong>Important! <\/strong><\/p>\n<p>The block stress \u03c4czul should also be checked in order to take into account the stress superimposition due to natural vibrations of the spring body with dynamically loaded compression springs.<\/p>\n<p>Dynamically stressed compression springs should be shot-peened before use. Shot peening compresses the surface layers so that a significantly better fatigue strength is achieved.<\/p>\n<p>For the fatigue strength of a compression spring, the normal ones are particularly suitable for medium dynamic applications<a href=\"https:\/\/blog.federnshop.com\/en\/spring-steel-properties\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Spring steel wire<\/a> EN 10270-1DH and SH, as well as the valve spring wires EN 10270-2-VDC, -VDSiCr, and -VDCrV for high dynamic applications.<\/p>\n<p><strong>Once corrosion or friction is through<a href=\"https:\/\/blog.federnshop.com\/federendlagerungen-knickgrenzen\/\"> Mandrel or sleeve<\/a> acts on the compression spring, the fatigue strength is no longer guaranteed! <\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><em>For more information:<\/em><\/p>\n<ul>\n<li><a href=\"https:\/\/blog.federnshop.com\/en\/types-of-stress-extension-springs\/\">Types of stress extension springs<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/de\/service_informationen\/federnauslegung.html\" target=\"_blank\" rel=\"noopener noreferrer\">Spring design<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/de\/service-und-informationen\/technische-beratung.html\" target=\"_blank\" rel=\"noopener noreferrer\">Technical advice from Gutekunst Federn<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/de\/federberechnung-auswahl.html\" target=\"_blank\" rel=\"noopener noreferrer\">Gutekunst spring calculation WinFSB<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Before interpreting the Compression spring It should basically be clarified whether the intended type of stress is static, quasi-static or dynamic. Static or quasi-static stress Time-constant (resting) load or time-changing load with less than 10,000 strokes in total or small<\/p>\n","protected":false},"author":4,"featured_media":6644,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[858,550,457,857],"tags":[1468,1466,1120,786,437,1467,787],"class_list":["post-6641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-compression-springs","category-industry-en","category-knowledge","category-wire-springs","tag-dauerhubfestigkeit-en","tag-dynamische-beanspruchung-en","tag-fatigue-strength","tag-federnberechnung-en","tag-springs","tag-statische-beanspruchung-en","tag-winfsb-en"],"_links":{"self":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts\/6641","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/comments?post=6641"}],"version-history":[{"count":7,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts\/6641\/revisions"}],"predecessor-version":[{"id":11424,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts\/6641\/revisions\/11424"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/media\/6644"}],"wp:attachment":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/media?parent=6641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/categories?post=6641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/tags?post=6641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}