{"id":8536,"date":"2026-04-22T15:01:28","date_gmt":"2026-04-22T07:01:28","guid":{"rendered":"http:\/\/www.camcjsw-testmachines.com\/?p=8536"},"modified":"2026-04-22T15:14:22","modified_gmt":"2026-04-22T07:14:22","slug":"industry-standard-metals-astm-e647-15-measurement-of-fatigue-crack-growth-rates","status":"publish","type":"post","link":"http:\/\/www.camcjsw-testmachines.com\/es\/industry-standard-metals-astm-e647-15-measurement-of-fatigue-crack-growth-rates\/","title":{"rendered":"Industry Standard \u2013 Metals \u2013 ASTM E647-15 \u2013 Measurement of Fatigue Crack Growth Rates"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"8536\" class=\"elementor elementor-8536\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6415ce7 e-flex e-con-boxed e-con e-parent\" data-id=\"6415ce7\" 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-4ff7a33 elementor-widget elementor-widget-heading\" data-id=\"4ff7a33\" 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><h3 class=\"elementor-heading-title elementor-size-default\">What is Fatigue Crack Growth Rate Testing (ASTM E647-15)?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d4ce8e4 elementor-widget elementor-widget-text-editor\" data-id=\"d4ce8e4\" 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>Fatigue crack growth rate testing, as defined by ASTM E647-15, is a standardized experimental method used to quantify the rate at which a fatigue crack extends in a metallic material under cyclic loading. Unlike total life fatigue tests (which measure cycles to failure from a smooth specimen), this method focuses specifically on the propagation phase of a pre-existing crack. It establishes the relationship between the crack growth rate per cycle ( da\/dN ) and the stress intensity factor range ( \u0394K ). This data is fundamental for &#8220;damage tolerance&#8221; design approaches, allowing engineers to predict the remaining service life of components containing known flaws or cracks, such as in aircraft structures, pressure vessels, and bridges.<\/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-9ac4800 e-flex e-con-boxed e-con e-parent\" data-id=\"9ac4800\" 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-09178b3 elementor-widget elementor-widget-heading\" data-id=\"09178b3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">What is a typical Fatigue Crack Growth Test Result?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2cfa1fd elementor-widget elementor-widget-text-editor\" data-id=\"2cfa1fd\" 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 primary output is a log-log plot of crack growth rate ( da\/dN ) versus stress intensity factor range ( \u0394K ), typically exhibiting three distinct regions:<\/p><p>\u2460 Region I (Threshold Region): At low \u0394K values, crack growth rates are extremely slow or non-existent. The threshold stress intensity factor range ( \u0394Kth ) is defined here as the value below which cracks do not propagate (or grow at a negligible rate, e.g., &lt; 10^\u221210 m\/cycle). This is critical for determining if a flaw is safe under service loads.<\/p><p>\u2461 Region II (Paris Regime): A linear region on the log-log plot where crack growth follows the Paris Law: da\/dN =\u00a0C(\u0394K)^m. Here, C and m are material constants. This region represents stable crack growth and is the most commonly used for life prediction calculations.<\/p><p>\u2462 Region III (Unstable Growth): At high\u0394K values approaching the material&#8217;s fracture toughness ( KIc or Kmat ), the crack growth rate accelerates rapidly until final catastrophic fracture occurs.<\/p><p>\u2463 Load Ratio Effects: Results often include curves for different load ratios ( R = Pmin \/\u00a0Pmax ), showing how mean stress influences growth rates (higher RR usually increases growth rates).<\/p><p>\u2464 Retardation\/Acceleration Data: If variable amplitude loading is applied, the test may show transient effects like crack growth retardation following an overload event.<\/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-5cef1db e-flex e-con-boxed e-con e-parent\" data-id=\"5cef1db\" 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-7bc513b elementor-widget elementor-widget-heading\" data-id=\"7bc513b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Discovery and Evolution of Crack Growth Testing<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-635fe08 elementor-widget elementor-widget-text-editor\" data-id=\"635fe08\" 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>Prior to the 1960s, fatigue design was primarily based on S-N curves (Stress-Life), which assumed defect-free materials. The catastrophic failures of early jet airliners (like the Comet) highlighted that small manufacturing defects or in-service cracks could grow undetected. Researchers like Paris, Erdogan, and Forman developed the fracture mechanics approach, linking crack growth to the stress intensity factor. ASTM E647 was established to standardize the complex procedures for generating this data, including specimen geometry, load shedding techniques (K-decreasing), and measurement methods. The standard has evolved to include rigorous requirements for closure correction, environmental control, and data reduction schemes to ensure consistency across global laboratories.<\/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-1f27413 e-flex e-con-boxed e-con e-parent\" data-id=\"1f27413\" 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-0fa16ca elementor-widget elementor-widget-heading\" data-id=\"0fa16ca\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The standard defines specific mechanical properties for material acceptance:<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-734ffc7 elementor-widget elementor-widget-text-editor\" data-id=\"734ffc7\" 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>Pre-cracked Specimens: Requires initiating a sharp fatigue crack before the actual data collection begins.<\/p><p>Fracture Mechanics Basis: Results are expressed in terms of Stress Intensity Factor ( \\Delta K\u0394K ) rather than nominal stress.<\/p><p>Growth Rate Focus: Measures the incremental extension of the crack ( da\/dNda\/dN ) rather than total cycles to failure.<br \/>K-Controlled Loading: Mandates specific procedures for increasing or decreasing \\Delta K\u0394K to map out the full curve accurately.<\/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-0d66965 e-flex e-con-boxed e-con e-parent\" data-id=\"0d66965\" 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-523a3f6 elementor-widget elementor-widget-heading\" data-id=\"523a3f6\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The key contents covered by the standard include:<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a3f15f6 elementor-widget elementor-widget-text-editor\" data-id=\"a3f15f6\" 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>Definitions of terms: Stress intensity factor, crack growth rate, load ratio, crack closure.<\/p><p>Apparatus requirements: Servo-hydraulic testing machines, high-resolution displacement gauges (clip gauges), and optical measurement systems.<\/p><p>Specimen preparation: Machining, pre-cracking procedures to generate a sharp, straight crack front.<\/p><p>Test procedures: Constant force amplitude, constant \\Delta K\u0394K , and K-decreasing methods for threshold determination.<\/p><p>Crack length measurement techniques: Visual, compliance, and potential drop methods.<\/p><p>Data reduction: Calculation of da\/dNda\/dN and \\Delta K\u0394K , fitting data to the Paris equation.<\/p><p>Reporting requirements: Detailed logs of load history, crack length vs. cycles, and environmental conditions.<\/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-5b2e202 e-flex e-con-boxed e-con e-parent\" data-id=\"5b2e202\" 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-30dd3ba elementor-widget elementor-widget-heading\" data-id=\"30dd3ba\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Referenced Standards<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bff6a4d elementor-widget elementor-widget-text-editor\" data-id=\"bff6a4d\" 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>ASTM E399: Plane-Strain Fracture Toughness of Metallic Materials (Provides KIc context).<\/p><p>ASTM E647: (Self-reference for definitions).<\/p><p>ASTM E1820: Measurement of Fracture Toughness (General fracture mechanics principles).<\/p><p>ASTM E8\/E8M: Tension Testing of Metallic Materials (For monotonic properties needed in calculations).<\/p><p>ISO 12108: Metallic materials \u2014 Fatigue testing \u2014 Fatigue crack growth method.<\/p><p>BS 7910: Guide to methods for assessing the acceptability of flaws in metallic structures.<\/p><p>NASGRO: Software\/Methodology widely used in aerospace based on ASTM E647 data.<\/p><p>API 579: Fitness-for-Service assessment procedure.<\/p><p>AASHTO: Bridge design specifications utilizing fracture mechanics.<\/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-e41971c e-flex e-con-boxed e-con e-parent\" data-id=\"e41971c\" 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-e23b5fc elementor-widget elementor-widget-heading\" data-id=\"e23b5fc\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Environment:<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9965faa elementor-widget elementor-widget-text-editor\" data-id=\"9965faa\" 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>Temperature: Typically room temperature (20\u00b0C to 25\u00b0C), but the standard allows for elevated or cryogenic temperatures if controlled.<\/p><p>Atmosphere: Ambient air is standard, but tests can be conducted in vacuum, inert gas, or corrosive environments to study specific degradation mechanisms.<\/p><p>Humidity: Can be a significant factor for certain alloys (e.g., aluminum); control may be required.<\/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-7c74e11 e-flex e-con-boxed e-con e-parent\" data-id=\"7c74e11\" 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-43d028e elementor-widget elementor-widget-heading\" data-id=\"43d028e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Test Procedure:<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c775ce5 elementor-widget elementor-widget-text-editor\" data-id=\"c775ce5\" 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<ol><li>Specimen Preparation: Machine the specimen (e.g., C(T)) to specified dimensions. Introduce a starter notch.<\/li><li>Pre-cracking: Apply cyclic loads to grow a sharp fatigue crack from the notch tip (typically 1-2 mm) to ensure a realistic crack tip radius.<\/li><li>Instrumentation: Install a clip gauge across the crack mouth to measure compliance (optional but recommended for automated tracking) and set up optical systems for visual crack tracking.<\/li><li>Threshold Determination (K-Decreasing): Start at a moderate \u0394K . Gradually decrease the load according to the normalized gradient Ckwhile monitoring crack growth. Continue until the growth rate drops to the threshold definition (e.g., 10^-10 m\/cycle).<\/li><li>Paris Region Testing (K-Increasing): Increase the load (or switch to constant load) to drive the crack through the stable growth region. Record crack length ( aa ) and cycle count ( NN ) frequently.<\/li><li>Fast Fracture: Continue loading until the specimen fractures or reaches a predetermined limit.<\/li><li>Data Collection: Continuously record Load, Displacement, and Cycle Count. Measure crack length visually at regular intervals to calibrate compliance data.<\/li><li>Analysis: Calculate da\/dNda\/dN using secant or polynomial fitting methods. Calculate \u0394K based on instantaneous crack length and applied load.<\/li><li>Reporting: Generate the da\/dN vs\u0394K curve, report \u0394Kth, and derive Paris constants ( C, m ).<\/li><\/ol>\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>What is Fatigue Crack Growth Rate Testing (ASTM E647-15)? Fatigue crack growth rate testing, as defined by ASTM E647-15, is a standardized experimental method used to quantify the rate at which a fatigue crack extends in a metallic material under cyclic loading. Unlike total life fatigue tests (which measure cycles to failure from a smooth [&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-8536","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 \u2013 Metals \u2013 ASTM E647-15 \u2013 Measurement of Fatigue Crack Growth Rates - 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\/industry-standard-metals-astm-e647-15-measurement-of-fatigue-crack-growth-rates\/\" \/>\r\n<meta property=\"og:locale\" content=\"es_ES\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Industry Standard \u2013 Metals \u2013 ASTM E647-15 \u2013 Measurement of Fatigue Crack Growth Rates\" \/>\r\n<meta property=\"og:description\" content=\"What is Fatigue Crack Growth Rate Testing (ASTM E647-15)? Fatigue crack growth rate testing, as defined by ASTM E647-15, is a standardized experimental method used to quantify the rate at which a fatigue crack extends in a metallic material under cyclic loading. 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