{"id":6413,"date":"2020-08-07T12:38:54","date_gmt":"2020-08-07T10:38:54","guid":{"rendered":"http:\/\/neu.ski-consult.de\/?page_id=6413"},"modified":"2025-09-22T13:26:49","modified_gmt":"2025-09-22T11:26:49","slug":"rissfortschrittskonzept","status":"publish","type":"page","link":"https:\/\/ski-consult.de\/en\/taetigkeitsbreiche\/strukturanalysen\/ermuedung\/rissfortschrittskonzept\/","title":{"rendered":"Crack growth concept"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"6413\" class=\"elementor elementor-6413\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-58257bd elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"58257bd\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4067f6d\" data-id=\"4067f6d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2cbe442 elementor-widget elementor-widget-heading\" data-id=\"2cbe442\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">From scribe to crack through the\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-128ebad elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"128ebad\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-a025485\" data-id=\"a025485\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-428d72e elementor-widget elementor-widget-text-editor\" data-id=\"428d72e\" data-element_type=\"widget\" data-e-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\t\t<p>The crack propagation concept (RFK) assumes that crack initiation has already occurred in the component. In this fracture mechanics approach, the crack shape and crack size are assumed to be known, and the service life until crack initiation is generally not taken into account. In contrast to the concepts described above, it is not the crack initiation that is examined here, but rather the crack growth up to a critical crack length at which residual fracture occurs due to the weakening of the cross-section.\u00a0<\/p><p>Since the stresses at the crack tip can assume very high, theoretically infinite values, local stresses and strains are unsuitable as characteristic stress variables. Instead, the stress intensity factor K, which depends on the crack length and stress level, is used in linear elastic fracture mechanics (LEFM) with negligible small plastic zones at the crack tip. Large plastic crack tip stresses can be captured by elastic-plastic fracture mechanics (EPFM).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-1c4ac75\" data-id=\"1c4ac75\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9e2b72b elementor-widget elementor-widget-image\" data-id=\"9e2b72b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"674\" height=\"600\" src=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Probe_3471df583a.jpg\" class=\"attachment-large size-large wp-image-6415\" alt=\"\" srcset=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Probe_3471df583a.jpg 674w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Probe_3471df583a-300x267.jpg 300w\" sizes=\"(max-width: 674px) 100vw, 674px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Crack propagation in a stump seam (experimental)\n<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f2fee92 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f2fee92\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-0ff388d\" data-id=\"0ff388d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-cbc7b2f elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"cbc7b2f\" data-element_type=\"widget\" data-e-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\t\t<p class=\"translation-block\"><span style=\"letter-spacing: 0px\">The main field of application in <\/span><a style=\"background-color: #ffffffff;letter-spacing: 0px\" title=\"damage accumulation hypothesis\" href=\"https:\/\/ski-consult.de\/en\/hochbau\/\" target=\"_self\">steel construction<\/a><span style=\"letter-spacing: 0px\">is less the replacement of stress-based fatigue calculation than the evaluation of cracks and crack-like imperfections. In particular, the crack propagation concept can be used to estimate the remaining service life in order to define the necessary inspection intervals or material toughness to avoid brittle fractures.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-0dd3f88\" data-id=\"0dd3f88\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d04ac6d elementor-widget__width-initial elementor-widget elementor-widget-video\" data-id=\"d04ac6d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;video_type&quot;:&quot;hosted&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;play_on_mobile&quot;:&quot;yes&quot;,&quot;loop&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-hosted-video elementor-wrapper elementor-open-inline\">\n\t\t\t\t\t<video class=\"elementor-video\" src=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2025\/09\/Crack-Tip-Opening-Displacement.mp4\" autoplay=\"\" loop=\"\" playsinline=\"\" controlslist=\"nodownload\"><\/video>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-9530959\" data-id=\"9530959\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fa780f5 elementor-widget__width-initial elementor-widget elementor-widget-video\" data-id=\"fa780f5\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;video_type&quot;:&quot;hosted&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;play_on_mobile&quot;:&quot;yes&quot;,&quot;loop&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-hosted-video elementor-wrapper elementor-open-inline\">\n\t\t\t\t\t<video class=\"elementor-video\" src=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2025\/09\/Schweissnaht-an-einem-Stahlrohrturm.mp4\" autoplay=\"\" loop=\"\" playsinline=\"\" controlslist=\"nodownload\"><\/video>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1bcecea elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1bcecea\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4a880e6\" data-id=\"4a880e6\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-46a36c2 elementor-widget elementor-widget-heading\" data-id=\"46a36c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">One option for the continued operation of structures<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a81bc34 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a81bc34\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-43ae475\" data-id=\"43ae475\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-65dd6a2 elementor-widget elementor-widget-text-editor\" data-id=\"65dd6a2\" data-element_type=\"widget\" data-e-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\t\t<p class=\"translation-block\">Crack propagation in metallic materials is a key area of research in fracture mechanics and plays an important role in the <a href=\"https:\/\/ski-consult.de\/en\/taetigkeitsbreiche\/onshore-windenergieanlagen\/weiterbetrieb-von-wea\/\" target=\"_self\">service life estimation<\/a> of safety-critical components. Crack propagation analysis is also a suitable assessment criterion with regard to the possible continued operation of cyclically stressed structures or the determination of inspection intervals.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-854ffd8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"854ffd8\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-45f9078\" data-id=\"45f9078\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0f4d33f elementor-widget elementor-widget-image\" data-id=\"0f4d33f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"441\" src=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Rissfortschrittskonzept_722d9153e7.jpg\" class=\"attachment-large size-large wp-image-6417\" alt=\"\" srcset=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Rissfortschrittskonzept_722d9153e7.jpg 800w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Rissfortschrittskonzept_722d9153e7-300x165.jpg 300w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Rissfortschrittskonzept_722d9153e7-768x423.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">The individual calculation steps in the crack growth concept\n<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-4bcf391\" data-id=\"4bcf391\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-00fce65 elementor-widget elementor-widget-image\" data-id=\"00fce65\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0.jpg\" class=\"attachment-large size-large wp-image-6416\" alt=\"Rissverlauf bei einer Stumpfnaht\" srcset=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0.jpg 600w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0-300x300.jpg 300w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0-150x150.jpg 150w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0-80x80.jpg 80w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0-70x70.jpg 70w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0-100x100.jpg 100w, https:\/\/ski-consult.de\/wp-content\/uploads\/2020\/08\/csm_Anriss_Stumpfnaht_Modell_1295fc2ce0-75x75.jpg 75w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Crack propagation in a butt joint (simulation)\n<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-90f9938 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"90f9938\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-30f30f8\" data-id=\"30f30f8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-04edd84 elementor-widget elementor-widget-heading\" data-id=\"04edd84\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Significance in practice<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a890ec elementor-widget elementor-widget-text-editor\" data-id=\"5a890ec\" data-element_type=\"widget\" data-e-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\t\t<p>The service life of load-bearing steel components can basically be divided into two sections:<\/p><ul><li>design life<\/li><li>crack propagation time<\/li><\/ul><p>Until now, fatigue-critical components in civil engineering have been designed primarily to withstand a technical crack, i.e. the design life. Components relevant to structural stability are usually assessed mathematically using linear damage accumulation. The crack propagation time allows safety-critical components to be assessed beyond their design life.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-3f65564\" data-id=\"3f65564\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dba757d elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"dba757d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"536\" src=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2025\/09\/Rissfortschritt.png\" class=\"attachment-large size-large wp-image-9863\" alt=\"Rissfortschrittsdauer\" srcset=\"https:\/\/ski-consult.de\/wp-content\/uploads\/2025\/09\/Rissfortschritt.png 722w, https:\/\/ski-consult.de\/wp-content\/uploads\/2025\/09\/Rissfortschritt-300x223.png 300w, https:\/\/ski-consult.de\/wp-content\/uploads\/2025\/09\/Rissfortschritt-16x12.png 16w\" sizes=\"(max-width: 722px) 100vw, 722px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0657d55 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0657d55\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a711554\" data-id=\"a711554\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c3e96f4 elementor-widget elementor-widget-text-editor\" data-id=\"c3e96f4\" data-element_type=\"widget\" data-e-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\t\t<p>For the crack propagation duration, crack propagation is calculated for the so-called technical crack under additional load conditions (static and\/or dynamic). In the case of additional cyclic loading, for example, the crack propagation rate describes how quickly a crack grows per load cycle. Crack propagation depends heavily on stress intensity, material behaviour and environmental conditions. In the initial phase, the crack grows steadily with each load cycle. This phase is referred to as stable crack propagation and can be described well using fracture mechanics methods, e.g. the Paris-Erdogan law. Eventually, the crack reaches a criticaal length at which unstable fracture occurs.<\/p><p>SKI Ingenieurges. mbH can perform crack propagation analyses and assess notch details (fatigue-critical components and connections) with regard to residual service life.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Vom Anriss bis zum Durchriss Beim\u00a0Rissfortschrittskonzept (RFK)\u00a0wird davon ausgegangen, dass im Bauteil bereits eine Rissinitiierung stattgefunden hat. Bei diesem bruchmechanischem Ansatz werden Rissform und Rissgr\u00f6\u00dfe als bekannt vorausgesetzt und die Lebensdauer bis zum Anriss bleibt in der Regel unber\u00fccksichtigt. Im Gegensatz zu den zuvor beschriebenen Konzepten wird hier nicht der Anriss, sondern das Risswachstum bis&#8230;<\/p>","protected":false},"author":4,"featured_media":0,"parent":6363,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-6413","page","type-page","status-publish","hentry","no-post-thumbnail"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rissfortschrittskonzept &#8226; SKI Ingenieurges. mbH<\/title>\n<meta name=\"description\" content=\"Rissfortschrittskonzept &#8226; SKI kann Berechnungen inkl. 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