{"id":7339,"date":"2026-02-11T16:49:21","date_gmt":"2026-02-11T08:49:21","guid":{"rendered":"http:\/\/www.camcjsw-testmachines.com\/?p=7339"},"modified":"2026-02-12T10:06:22","modified_gmt":"2026-02-12T02:06:22","slug":"hybrid-creep-fatigue-interaction-hcfi-test-operated-by-sinotest-rpl-100-creep-fatigue-testing-machine","status":"publish","type":"post","link":"http:\/\/www.camcjsw-testmachines.com\/es\/hybrid-creep-fatigue-interaction-hcfi-test-operated-by-sinotest-rpl-100-creep-fatigue-testing-machine\/","title":{"rendered":"Hybrid Creep-Fatigue Interaction (HCFI)\u00a0Test operated by SINOTEST RPL-100 Creep Fatigue Testing Machine"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7339\" class=\"elementor elementor-7339\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-342a37f e-flex e-con-boxed e-con e-parent\" data-id=\"342a37f\" 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-e1986ea elementor-widget elementor-widget-heading\" data-id=\"e1986ea\" 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\">Industry Background<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cd35203 elementor-widget elementor-widget-text-editor\" data-id=\"cd35203\" 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>Components that are exposed to high temperature for a long time (hereinafter referred to as high temperature components) often fail prematurely due to the combined effects of temperature and load. This combined effect is referred to as &#8220;creep-fatigue interaction (CFI)\u2460&#8221;, which is a significant factor leading to premature failure of components in high temperature environments.<\/p><p>In the actual working environment of aerospace and electric power industries, high-temperature components undergo strain-controlled\u2463\u00a0fatigue cycles during thermal transients when starting and stopping, while they endure stress-controlled\u2464\u00a0steady loads during stable operation (downtime).<\/p><p>Therefore, the actual loading condition of high temperature components is a hybrid loading of stress and strain controlled creep-fatigue interaction (HCFI).<\/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-6c3f1d8 e-flex e-con-boxed e-con e-parent\" data-id=\"6c3f1d8\" 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-4b25f33 elementor-widget elementor-widget-heading\" data-id=\"4b25f33\" 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\">Problem Discovery<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43909bd elementor-widget elementor-widget-text-editor\" data-id=\"43909bd\" 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>How to evaluate the mechanical properties of high temperature components affected by creep-fatigue interaction?<\/p><p>We usually will carry out the traditional\u00a0creep-fatigue interaction (CCFI) test. However, it should be noted that this test typically operates under strain control, resulting in stress relaxation\u2465\u00a0during the dwell time rather than stress control. Consequently, it fails to replicate the creep strain (\u03b5c) \u2467induced by stress control during HCFI dwell time in high-temperature components, deviating from their actual service conditions and compromising the test results&#8217; reliability in evaluating material performance.<\/p><p>Could\u00a0we replicate the HCFI loading conditions of high-temperature components under actual operating conditions in the laboratory? Let&#8217;s explore this through a practical case study.<\/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-f10bf70 e-flex e-con-boxed e-con e-parent\" data-id=\"f10bf70\" 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-aa10217 elementor-widget elementor-widget-heading\" data-id=\"aa10217\" 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\">Practice Case<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a5c29a elementor-widget elementor-widget-text-editor\" data-id=\"7a5c29a\" 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>Recently, the SCHOOL\u00a0OF\u00a0MECHANICAL\u00a0SCIENCE\u00a0at Nanjing University of Science and Technology conducted a comprehensive hybrid creep-fatigue interaction\u00a0HCFI test using the SINOTEST RPL100 Creep-Fatigue Testing Machine (hereinafter referred to as the equipment).<\/p><p>During the test, the RPL100 creep-fatigue testing machine, through its controller, switches the sample&#8217;s control mode from strain-controlled fatigue cycles to stress-controlled during unloading after the fatigue cycle. This simulates two load control modes under actual working conditions: the strain-controlled mode during cyclic loading, and the stress-controlled mode during dwell or steady loading (dwell time). It accurately replicates the HCFI hybrid loading mode experienced by high-temperature components in real-world applications.<\/p><p>Below\u00a0figure illustrates stress and strain control conditions at different stages of the machine. The blue line represents the strain-controlled fatigue cycle phase in the HCFI test, while the red line indicates the stress-controlled holding phase. The vertical axis shows the creep strain (\u03b5, Figure a) and stress (\u03b4, Figure b) of the sample, with the horizontal axis representing the test duration.<\/p><p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-7346 size-full\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/6e6050f5-1747-4a09-bcf5-bd38b946fec9.webp\" alt=\"\" width=\"554\" height=\"325\" srcset=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/6e6050f5-1747-4a09-bcf5-bd38b946fec9.webp 554w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/6e6050f5-1747-4a09-bcf5-bd38b946fec9-300x176.webp 300w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/6e6050f5-1747-4a09-bcf5-bd38b946fec9-18x12.webp 18w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/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-8c71c5d e-flex e-con-boxed e-con e-parent\" data-id=\"8c71c5d\" 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-f5618f5 elementor-widget elementor-widget-heading\" data-id=\"f5618f5\" 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\">Data Sharing<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-85087f7 elementor-widget elementor-widget-text-editor\" data-id=\"85087f7\" 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>Next, we share two important test\u00a0data.<\/p><p><strong><b>Data 1<\/b><\/strong><\/p><p>The figure below illustrates the variation in peak tensile stress of the specimen with increasing cycle numbers under different dwell times and corresponding stresses. It compares four stress levels:\u00a0140MPa (a), 150MPa (b), 160MPa (c), 170MPa (d)) and 3\u00a0dwell times:\u00a0300 seconds [black line], 600 seconds [red line], 1800 seconds [blue line]) against pure fatigue loading (PF, green line). The x-axis represents HCFI cycle numbers (N), while the y-axis shows the specimen&#8217;s maximum tensile stress (MPa).<\/p><p><img decoding=\"async\" class=\"alignnone wp-image-7347 size-full\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/f64c2004-3a9f-4543-8cae-95fcb0d16d13.webp\" alt=\"\" width=\"554\" height=\"450\" srcset=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/f64c2004-3a9f-4543-8cae-95fcb0d16d13.webp 554w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/f64c2004-3a9f-4543-8cae-95fcb0d16d13-300x244.webp 300w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/f64c2004-3a9f-4543-8cae-95fcb0d16d13-15x12.webp 15w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/p><p>Figure 2: Variation of peak tensile stress in HCFI tests under different dwell times and dwell stresses<\/p><p>The figure demonstrates that when the holding time remains constant, higher stress during the holding period results in a faster increase in the sample&#8217;s creep strain. Similarly, under identical holding stress conditions, longer holding time leads to a faster rise in creep strain. Therefore, it can be concluded that in HCFI tests, creep strain increases with both the holding stress and the holding time.<\/p><p><strong><b>Data 2<\/b><\/strong><\/p><p>The figure below shows the effects of cycle times on creep strain rate under different dwell time stresses (left), and the effects of dwell time stresses on creep strain half-life (right), with traditional creep-fatigue interaction (CCFI) tests for comparison.<\/p><p><img decoding=\"async\" class=\"alignnone wp-image-7348 size-full\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/b46108a3-ccdc-4e6c-bd77-fb7ae6255944.webp\" alt=\"\" width=\"554\" height=\"217\" srcset=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/b46108a3-ccdc-4e6c-bd77-fb7ae6255944.webp 554w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/b46108a3-ccdc-4e6c-bd77-fb7ae6255944-300x118.webp 300w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/b46108a3-ccdc-4e6c-bd77-fb7ae6255944-18x7.webp 18w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/p><p>Figure 3: Creep strain responses of HCFI and CCFI tests<\/p><p>The results show that under the same conditions, the increase of residence time stress in HCFI will increase the creep strain velocity of the specimen, but the same effect is not observed in CCFI.<\/p><p>The right figure shows that the creep strain (0.084%) at 140 MPa holding stress in HCFI is comparable to the strain observed in the CCFI test under more extreme conditions (650\u00b0C), as indicated by the red line.<\/p><p>This demonstrates that HCFI loads induce greater creep damage than CCFI loads, further confirming that CCFI tests cannot replicate the effects of HCFI on high-temperature components.<\/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-43c666c e-flex e-con-boxed e-con e-parent\" data-id=\"43c666c\" 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-81dda40 elementor-widget elementor-widget-heading\" data-id=\"81dda40\" 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\">Conclusion<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da6d878 elementor-widget elementor-widget-text-editor\" data-id=\"da6d878\" 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>The above tests\u00a0can conclude that the RPL100 creep-fatigue testing machine can fully reproduce the real service environment of high temperature components and complete the mechanical properties test of components under such conditions.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-7349 size-full\" src=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/71aae441-889c-4836-bac6-67b815dfc52f.webp\" alt=\"\" width=\"554\" height=\"646\" srcset=\"http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/71aae441-889c-4836-bac6-67b815dfc52f.webp 554w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/71aae441-889c-4836-bac6-67b815dfc52f-257x300.webp 257w, http:\/\/www.camcjsw-testmachines.com\/wp-content\/uploads\/2026\/02\/71aae441-889c-4836-bac6-67b815dfc52f-10x12.webp 10w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/p><p>SINOTEST RPL100 Creep-Fatigue Testing Machine<\/p><p>The SINOTEST RPL100 Creep-Fatigue Testing Machine is designed for long-term mechanical property testing of advanced materials and components, including high-temperature alloys, refractory metals, ceramics, and composites. It operates under various extreme conditions such as high-temperature vacuum, inert gas, atmospheric environments, corrosive flue gases, and water-oxygen coupling. The machine covers a comprehensive range of critical performance evaluation items, including creep, long-term strength, stress relaxation, cyclic endurance, creep-fatigue interaction, slow-rate stress corrosion, small-punch creep, and hydrogen embrittlement sensitivity.<\/p><p>The machine\u00a0employs a high-precision closed-loop control system to enable precise switching between strain control and stress control modes, as well as hybrid loading. This allows for highly accurate simulation of the complex load history experienced by high-temperature components during actual start-stop cycles and steady-state operation. By addressing the limitation of traditional pure strain control tests\u2014where stress relaxation prevents accurate modeling of the stress holding phase\u2014the system successfully reconstructs the creep-fatigue interaction (HCFI) environment under laboratory conditions.<\/p><p>By providing long-term, stable and reliable test data, the RPL100 creep-fatigue testing machine by China Machine Testing breaks the limitation of traditional testing method in simulating real working condition, and unifies the laboratory test condition with the actual service environment of engineering, making the performance evaluation of materials and components more scientific and accurate.<\/p><p>The equipment provides advanced testing solution\u00a0to break through the technical bottleneck of long life and high reliability design and evaluation of high temperature components, and is an important technical cornerstone to ensure the safe operation of major equipment and enhance the core competitiveness of advanced manufacturing industry.<\/p><p><strong><b>Appendix: Basic Concept Analysis<\/b><\/strong><\/p><p>\u2460 Creep-fatigue interaction: When creep and fatigue damage occur sequentially or simultaneously, one type of damage will have a certain influence on the development process of the other, thus accelerating or slowing down the total damage and affecting the fatigue life of the material. This is called creep-fatigue interaction.<\/p><p>\u2461 Stress: Stress refers to the internal forces that interact within an object when it is deformed by external forces.<\/p><p>\u2462Strain: Strain refers to the local relative deformation of an object caused by external forces or non-uniform temperature fields.<\/p><p>\u2463Stress control: The rate of stress increase per unit time.<\/p><p>\u2464Strain control: controls the increase of local strain per unit time.<\/p><p>\u2465Stress relaxation: Stress relaxation refers to a phenomenon where the total deformation (comprising elastic and plastic deformation) of a component remains constant, while creep causes the plastic deformation to progressively increase and the elastic deformation to decrease correspondingly, with stress gradually decreasing over time.<\/p><p>\u2466 Creep: The phenomenon where the strain of a solid material increases over time while the stress remains constant.<\/p><p>\u2467 Creep strain: Creep strain refers to the plastic deformation that occurs in materials over time under constant stress.<\/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>Industry Background Components that are exposed to high temperature for a long time (hereinafter referred to as high temperature components) often fail prematurely due to the combined effects of temperature and load. This combined effect is referred to as &#8220;creep-fatigue interaction (CFI)\u2460&#8221;, which is a significant factor leading to premature failure of components in high [&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":[25],"tags":[],"class_list":["post-7339","post","type-post","status-publish","format-standard","hentry","category-blogs"],"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>Hybrid Creep-Fatigue Interaction (HCFI)\u00a0Test operated by SINOTEST RPL-100 Creep Fatigue Testing Machine - SinoTest Testing Systems<\/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\/es\/hybrid-creep-fatigue-interaction-hcfi-test-operated-by-sinotest-rpl-100-creep-fatigue-testing-machine\/\" \/>\r\n<meta property=\"og:locale\" content=\"es_ES\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Hybrid Creep-Fatigue Interaction (HCFI)\u00a0Test operated by SINOTEST RPL-100 Creep Fatigue Testing Machine\" \/>\r\n<meta property=\"og:description\" content=\"Industry Background Components that are exposed to high temperature for a long time (hereinafter referred to as high temperature components) often fail prematurely due to the combined effects of temperature and load. 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