{"id":3031,"date":"2026-06-22T12:10:37","date_gmt":"2026-06-22T10:10:37","guid":{"rendered":"https:\/\/www.technical-center.de\/materials-testing-analysis\/fracture-mechanics-testing\/"},"modified":"2026-06-22T12:10:37","modified_gmt":"2026-06-22T10:10:37","slug":"fracture-mechanics-testing","status":"publish","type":"page","link":"https:\/\/www.technical-center.de\/en\/materials-testing-analysis\/fracture-mechanics-testing\/","title":{"rendered":"Fracture Mechanics Testing"},"content":{"rendered":"<div class=\"tm-content yootheme-landing uk-scope\">\n<div class=\"uk-section uk-section-muted uk-padding-large\">\n<div class=\"uk-container uk-container-large\">\n<div class=\"uk-grid-large\" uk-grid=\"\">\n<div class=\"uk-width-1-2@m\">\n<h2>How can components continue to operate safely despite existing cracks?<\/h2>\n<p>This article provides an overview of <a class=\"tc-inlink\" href=\"\/en\/materials-testing-analysis\/\">materials testing<\/a> in fracture mechanics and explains how these analysis methods help to assess, predict and prevent material failure.<\/p>\n<p>Modern methods make it possible to assess cracks in components and welded structures with precision. Not every crack automatically leads to the replacement of expensive components &#8211; only when a critical size is reached does a real danger exist. Scientifically sound methods allow the remaining service life to be estimated reliably, combining safety with cost-efficiency.<\/p>\n<p>These analyses go far beyond simple strength tests and take into account the complex relationships between crack size, material toughness and mechanical loading. Statutory guidelines require these assessments for safety-critical applications &#8211; from pressure equipment to load-bearing structures.<\/p>\n<\/div>\n<div class=\"uk-width-1-2@m\"><div class=\"su-box su-box-style-default\" id=\"\" style=\"border-color:#000346;border-radius:3px;max-width:none\"><div class=\"su-box-title\" style=\"background-color:#0F3679;color:#FFFFFF;border-top-left-radius:1px;border-top-right-radius:1px\">The key findings<\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:1px;border-bottom-right-radius:1px\">\n<div class=\"su-list\" style=\"margin-left:0px\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li><i class=\"sui sui-check\" style=\"color:#FE5816\"><\/i> Cracks in components are not automatically dangerous and require a proper assessment<\/li>\n<li><i class=\"sui sui-check\" style=\"color:#FE5816\"><\/i> Modern analysis methods enable precise predictions about the remaining service life<\/li>\n<li><i class=\"sui sui-check\" style=\"color:#FE5816\"><\/i> Statutory guidelines require these testing procedures for safety-critical components<\/li>\n<li><i class=\"sui sui-check\" style=\"color:#FE5816\"><\/i> Preventing brittle fracture is central to component safety<\/li>\n<li><i class=\"sui sui-check\" style=\"color:#FE5816\"><\/i> Economical operation and safety can be combined through sound analyses<\/li>\n<li><i class=\"sui sui-check\" style=\"color:#FE5816\"><\/i> \n<div>The fundamental safety principle is: the loading must not exceed the resistance.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"uk-margin-small-top uk-margin-small-bottom uk-text-center\"><img decoding=\"async\" class=\"uk-width-3-4@m uk-width-1-1 uk-border-rounded uk-box-shadow-small\" src=\"https:\/\/www.technical-center.de\/wp-content\/uploads\/2026\/03\/werkstoffpruefung-analytik_bruchmechanische-pruefungen.jpg\" alt=\"Fracture mechanics testing in materials testing\" \/><\/div>\n<div id=\"korrosiv\" class=\"uk-section uk-section-default section-block\">\n<div class=\"uk-container uk-container-small\">\n<h2>Fundamentals of materials testing in fracture mechanics<\/h2>\n<p>Fracture mechanics investigates how and why materials fail under load. This discipline combines mathematical models with practical testing procedures in order to ensure the safety of components. Materials testing in fracture mechanics has become internationally established over the past 40 years and now offers reliable methods for almost every industrial sector.<\/p>\n<p>Two central aspects are at the heart of this: the loading caused by external forces and the internal resistance of the material. This duality enables a comprehensive assessment of material safety.<\/p>\n<div class=\"uk-grid-large uk-child-width-1-2@m lp-compact-grid\" uk-grid=\"\">\n<div>\n<h3>Basic principles of fracture-mechanical analysis<\/h3>\n<p>A fracture-mechanical analysis always considers two sides of the same coin. On one side is the crack loading, which results from external and internal stresses. On the other side is the crack resistance that the material can oppose to this attack.<\/p>\n<p>The loading side is determined through calculations on the component. Engineers analyse which forces act on an existing or potential crack. This analysis takes into account static loads, but also cyclic and dynamic loading.<\/p>\n<p>The resistance side comes from the laboratory. Here, crack toughness values are measured on specially prepared specimens. These values show how much load a material can withstand before a crack becomes critical.<\/p>\n<p>The interplay of both sides enables a sound safety assessment. If the loading is smaller than the resistance, the component is considered safe. If the loading exceeds the resistance, failure is imminent.<\/p>\n<h3>Failure mechanisms under load<\/h3>\n<p>Materials do not simply break &#8211; they exhibit different types of failure that depend on several factors. The temperature, the loading rate and the material properties determine how a material reacts.<\/p>\n<p>At low temperatures, brittle fracture often occurs. The material fails suddenly and without prior deformation. This mechanism is particularly dangerous because it gives no warning.<\/p>\n<p>At higher temperatures, many materials exhibit ductile behaviour. They first deform plastically before they finally fail. This advance warning through deformation makes ductile materials safer in many applications.<\/p>\n<p>A third mechanism is fatigue failure under repeated loading. Even when the individual load is far below the fracture limit, a crack can slowly grow. After many cycles it reaches a critical size and leads to sudden failure.<\/p>\n<p>Fracture toughness testing helps to understand and predict these different types of failure. It provides quantitative values that feed into safety calculations.<\/p>\n<\/div>\n<div>\n<h3>Industrial fields of application<\/h3>\n<p>Fracture-mechanical methods originally came from nuclear technology and the aerospace industry. These pioneering applications required the highest safety standards and drove development forward.<\/p>\n<p>Today, many conventional sectors use these proven methods. Transfer models such as the Master Curve concept enable pragmatic application even where elaborate individual tests were previously necessary.<\/p>\n<div class=\"su-note\"  style=\"border-color:#ceccd6;border-radius:1px;-moz-border-radius:1px;-webkit-border-radius:1px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#E8E6F0;border-color:#ffffff;color:#000000;border-radius:1px;-moz-border-radius:1px;-webkit-border-radius:1px;\">\n<strong>The most important fields of application include:<\/strong><\/p>\n<ul>\n<li>Steel construction and bridge structures<\/li>\n<li>Pressure vessels, pipelines and fittings<\/li>\n<li>Offshore and wind energy plants<\/li>\n<li>Shipbuilding and maritime structures<\/li>\n<li>Rail vehicles and railway technology<\/li>\n<li>Heavy mechanical engineering and construction machinery<\/li>\n<\/ul>\n<\/div><\/div>\n<p>Welded structures in particular benefit from fracture-mechanical analyses. Weld seams are potential weak points where cracks can form. An accurate assessment of these areas considerably increases operational safety.<\/p>\n<p>Cast components are also regularly examined using fracture mechanics. Casting defects such as voids or inclusions can act as crack initiation points. The test shows whether such defects are tolerable or whether the component must be discarded.<\/p>\n<p>In aerospace technology, fracture mechanics remains indispensable. Every gram counts, which is why components are pushed to their limits. Only precise fracture-mechanical calculations make this safely possible.<\/p>\n<p>Wherever safety and reliability are decisive, fracture-mechanical tests are standard. They protect human lives and prevent costly failures.<\/p>\n<\/div>\n<\/div>\n<div id=\"korrosiv\" class=\"uk-section uk-section-default section-block\">\n<div class=\"uk-container uk-container-small\">\n<h2>Fracture mechanics testing: core methods at a glance<\/h2>\n<p>Various test procedures form the foundation for reliable material analyses. These methods make it possible to investigate the behaviour of materials under different loads with precision. Each testing technique provides specific characteristic values that are indispensable for safe designs.<\/p>\n<p>The choice of the appropriate method depends on the respective question. Static, cyclic and dynamic load cases require different testing approaches. Modern laboratories combine these procedures in order to obtain a complete picture of the material properties.<\/p>\n<div class=\"uk-grid-large uk-child-width-1-2@m lp-compact-grid\" uk-grid=\"\">\n<div>\n<h3>Fracture toughness testing for safe material selection<\/h3>\n<p>Fracture toughness shows how well a material resists the propagation of cracks. This fundamental property determines the suitability of a material for safety-critical applications. In fracture toughness testing, standardised specimens with defined notches are prepared and loaded under controlled conditions.<\/p>\n<p>The test provides concrete characteristic values that indicate at which loading a crack begins to grow. This information is decisive for engineers in material selection. Various temperatures and loading rates are tested, since materials behave differently depending on the conditions.<\/p>\n<p>The data obtained feed directly into safety calculations. They enable a sound assessment of whether a material withstands the requirements. Fracture toughness testing thus forms the basis for reliable designs in aerospace, energy technology or mechanical engineering.<\/p>\n<h3>Documenting fatigue crack growth reliably<\/h3>\n<p>Many components do not fail through a single overload, but through millions of repetitions of smaller loads. Fatigue crack growth describes how cracks slowly enlarge under cyclic loading. This investigation is particularly important for components that are exposed to constant vibrations or load cycles.<\/p>\n<p>In fatigue tests, a specimen is loaded over thousands or millions of cycles. During this process, the continuous growth of a crack is precisely tracked and documented. The data obtained show how quickly a crack grows under certain conditions and when critical sizes are reached.<\/p>\n<p>This information is fundamental for maintenance intervals and service-life predictions. It helps to determine when a component must be replaced before failure occurs. The documentation of fatigue crack growth thus contributes significantly to operational safety.<\/p>\n<\/div>\n<div>\n<h3>Crack propagation testing under realistic conditions<\/h3>\n<p>Laboratory tests must be as close as possible to reality in order to deliver meaningful results. Crack propagation testing therefore takes into account the actual operating conditions of the components. This means integrating operating temperatures, corrosive media and complex stress states into the test set-up.<\/p>\n<p>Modern test facilities can combine various parameters simultaneously. In this way it is possible to investigate how a crack behaves at high temperatures and simultaneous chemical loading. This practical approach delivers data that are directly transferable to real applications.<\/p>\n<p>Adapting the test conditions to the actual problem leads to economical and safe solutions. Through realistic crack propagation testing, safety reserves can be optimally dimensioned. This avoids both over-dimensioning and dangerous underestimation of the load-bearing capacity.<\/p>\n<\/div>\n<\/div>\n<h2>Central measured quantities and test parameters<\/h2>\n<p>In fracture-mechanical analysis, everything revolves around quantifiable quantities that make safety measurable. These parameters enable engineers to predict the failure behaviour of materials with precision. On the material side, crack toughness values are determined with the help of laboratory specimens that are tested under controlled conditions.<\/p>\n<p>The fracture-mechanical safety analysis is applied to static, cyclic and dynamic load cases. International standards such as BS 7910, API572 and the FKM Guideline are used here. Standards such as EN 1993-1-10 Method 2 (Eurocode 3), EN 13445 as well as EN 13480 Part 2 Annex B Method 3 for pressure vessels and pipes also provide important specifications.<\/p>\n<div class=\"su-tabs su-tabs-style-default su-tabs-mobile-stack\" data-active=\"1\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-tabs-nav\"><span class=\"\" data-url=\"\" data-target=\"blank\" tabindex=\"0\" role=\"button\">K factor<\/span><span class=\"\" data-url=\"\" data-target=\"blank\" tabindex=\"0\" role=\"button\">J-integral measurement<\/span><span class=\"\" data-url=\"\" data-target=\"blank\" tabindex=\"0\" role=\"button\">CTOD test<\/span><span class=\"\" data-url=\"\" data-target=\"blank\" tabindex=\"0\" role=\"button\">Crack resistance curves<\/span><\/div><div class=\"su-tabs-panes\"><div class=\"su-tabs-pane su-u-clearfix su-u-trim\" data-title=\"K factor\">\n<h3>K factor determination for assessing stress intensity<\/h3>\n<p>The stress intensity factor K forms the heart of linear fracture mechanics. It describes how strongly the stress field is concentrated at a crack tip. The higher this value, the greater the danger of spontaneous crack progression.<\/p>\n<p>The determination of the K factor depends on three essential factors: the applied stress, the crack size and the geometric configuration of the component. Specially prepared specimens with defined pre-cracks are loaded in testing machines. Sensors continuously record the applied force and the deformation.<\/p>\n<p>Particularly important is the comparison with a critical value. This so-called critical stress intensity factor indicates at which loading a crack becomes unstable. Below this threshold the material remains safe, above it uncontrolled crack growth begins.<br \/>\n<\/div>\n<div class=\"su-tabs-pane su-u-clearfix su-u-trim\" data-title=\"J-integral measurement\">\n<h3>J-integral measurement for ductile materials<\/h3>\n<p>With tough materials, the K factor reaches its limits. This is where the J-integral comes into play, which pursues an energy-based approach. It quantifies the energy required to make a crack grow by a certain distance.<\/p>\n<p>The determination of the J-integral is particularly relevant for modern high-strength steels and aluminium alloys. These materials deform considerably before fracture, which makes classical approaches inaccurate. The J-integral captures both elastic and plastic deformation components.<\/p>\n<p>According to ASTM E1820, the load-deformation curve is recorded during the test. The J-integral can be calculated from the area under this curve. The standard ASTM E1820 provides exact specifications for specimen geometries and evaluation procedures in order to ensure comparable results.<br \/>\n<\/div>\n<div class=\"su-tabs-pane su-u-clearfix su-u-trim\" data-title=\"CTOD test\">\n<h3>CTOD test for precise crack opening values<\/h3>\n<p>The Crack Tip Opening Displacement, or CTOD for short, offers a direct geometric approach to crack loading. This parameter measures the mechanical opening directly at the crack tip. Unlike abstract energy values, it provides a clear, physically tangible quantity.<\/p>\n<p>The CTOD test often uses optical measurement methods or special clip gauges that are attached to the specimen. These sensors detect even the smallest displacements in the micrometre range. The measurement is particularly precise and provides reliable data on the deformation behaviour.<\/p>\n<p>In practice, the CTOD test is mainly used for welded joints and in the offshore sector. International standards often make this measured quantity mandatory for safety-relevant structures. The oil and gas industry uses CTOD values to qualify weld seams under extreme conditions.<br \/>\n<\/div>\n<div class=\"su-tabs-pane su-u-clearfix su-u-trim\" data-title=\"Crack resistance curves\">\n<h3>Understanding and using crack resistance curves<\/h3>\n<p>Crack resistance curves, also called R-curves, describe the dynamic behaviour of a growing crack. They reveal a fascinating phenomenon: many materials develop an increasing resistance as crack growth progresses. The longer the crack becomes, the more energy further growth requires.<\/p>\n<p>This effect arises from hardening mechanisms in the material. The plastic zone in front of the crack tip enlarges and acts like a brake. Crack resistance curves capture this complex behaviour over the entire loading range.<\/p>\n<p>In safety analyses, R-curves offer clear advantages over individual characteristic values. They allow a differentiated assessment of the material behaviour at different crack sizes. Designers can thereby estimate more accurately how existing defects develop under operating load.<\/p>\n<p>The determination is carried out using special multi-specimen procedures or single-specimen techniques. Modern testing systems continuously record the crack length and the associated loading values. These data are then combined into a resistance curve that documents the complete fracture behaviour.<br \/>\n<\/div><\/div><\/div>\n<div id=\"korrosiv\" class=\"uk-section uk-section-default section-block\">\n<div class=\"uk-container uk-container-small\">\n<h2>Practical applications and added value<\/h2>\n<p>From the development of new materials to <a class=\"tc-inlink\" href=\"\/en\/failure-analysis-forensic-engineering\/\">failure analysis<\/a> &#8211; fracture-mechanical methods offer versatile solutions. The testing procedures answer concrete questions from everyday engineering. They create safety and enable economical decisions in a wide variety of situations.<\/p>\n<p>Numerous components\/systems and welded structures have been preserved through fracture-mechanical analyses. The methods provide reliable statements about the further service life of components. As a result, expensive replacement measures can be avoided without making compromises on safety.<\/p>\n<div class=\"uk-grid-large uk-child-width-1-2@m lp-compact-grid\" uk-grid=\"\">\n<div>\n<h3>Quality control in new developments<\/h3>\n<p>Innovative materials undergo systematic testing before they are put into use. Crack propagation testing is one of the most important procedures in the development phase. It shows at an early stage how new materials behave under realistic loads.<\/p>\n<p>Through fracture-mechanical characterisation, optimal material compositions can be found. Heat treatments are specifically adapted and welding parameters precisely optimised. This systematic approach leads to safe and reliable products.<\/p>\n<p>The tests identify critical weak points already in early development phases. Design improvements can be made in good time. This avoids costly rework or recall actions in later operation.<\/p>\n<div class=\"su-note\"  style=\"border-color:#ceccd6;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#E8E6F0;border-color:#ffffff;color:#000000;\">\n<strong>Typical fields of application include:<\/strong><\/p>\n<ul>\n<li>Development of high-strength steels for lightweight construction<\/li>\n<li>Optimisation of welded joints for offshore structures<\/li>\n<li>Qualification of new alloys for low-temperature use<\/li>\n<li>Assessment of alternative manufacturing processes with regard to crack safety<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n<div>\n<h3>Safety analysis for highly stressed components<\/h3>\n<p>Components in critical operating situations require special attention. Fracture-mechanical methods assess whether components withstand extreme requirements. This applies to low temperatures in the arctic offshore sector as well as to high pressures in chemical plants.<\/p>\n<p>A typical question is: is a component with a crack still safe to operate? The answer is provided by systematic analyses according to recognised standards. Assessment procedures such as BS 7910 or the FKM Guideline enable sound statements on operational safety.<\/p>\n<p>Crack propagation testing under realistic conditions plays a central role here. It simulates the actual loads in operation. This creates a realistic picture of component safety.<\/p>\n<p>A further scenario concerns components with conspicuous test results. If, for example, an impact energy that is too low and outside the standard requirement has been determined, the question of safety arises. Fracture-mechanical analyses clarify whether the component can nevertheless be used.<\/p>\n<p>This approach follows the principle of &#8220;living with cracks&#8221;. It enables economical solutions without compromising safety. Numerous applications benefit from this pragmatic procedure:<br \/>\n<div class=\"su-note\"  style=\"border-color:#ceccd6;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#E8E6F0;border-color:#ffffff;color:#000000;\">\n<ol>\n<li>Assessment of weld seams in pressure lines<\/li>\n<li>Analysis of turbine blades under centrifugal loading<\/li>\n<li>Testing of crane components under cyclic loading<\/li>\n<li>Safety verification for vessels in low-temperature operation<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n<\/div>\n<h3>Damage investigation and remaining service life estimation<\/h3>\n<p>Components already in operation sometimes require subsequent analyses. A discovered crack or deviating material parameters trigger investigations. The central question is: how much time remains before an initial crack becomes critical and leads to failure?<\/p>\n<p>Fatigue crack growth provides precise answers to this question. The analysis shows how quickly an existing crack propagates under operating load. This results in concrete time windows for further inspections or necessary measures.<\/p>\n<p>Practical questions in failure analysis cover various scenarios. Can a component with a known crack still be operated safely? Which inspection intervals are required? Must a component be replaced immediately, or is monitoring sufficient?<\/p>\n<p>The methods for estimating fatigue crack growth enable sound decisions. They take into account the actual operating conditions and load cycles. The result is a realistic forecast of the remaining service life.<\/p>\n<p>This approach offers considerable economic advantages. Unnecessary replacement measures are avoided while safety remains guaranteed. At the same time, clear recommendations for action arise for operators and maintenance.<\/p>\n<p>A further important question concerns the toughness requirements under special conditions. How high must the toughness be for low-temperature use? Which requirements apply to new steels and welded joints? Fracture-mechanical tests provide the required characteristic values for safe specifications.<\/p>\n<div class=\"su-note\"  style=\"border-color:#ceccd6;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#E8E6F0;border-color:#ffffff;color:#000000;\">\n<strong>Typical fields of application for remaining service life estimation:<\/strong><\/p>\n<ul>\n<li>Ageing assessment of bridges and steel structures<\/li>\n<li>Service-life analysis of pressure vessels and pipelines<\/li>\n<li>Damage expert reports following operational disruptions<\/li>\n<li>Optimisation of maintenance intervals for critical components<\/li>\n<\/ul>\n<\/div><\/div>\n<div class=\"su-box su-box-style-default\" id=\"\" style=\"border-color:#000346;border-radius:3px;max-width:none\"><div class=\"su-box-title\" style=\"background-color:#0F3679;color:#FFFFFF;border-top-left-radius:1px;border-top-right-radius:1px\">Conclusion<\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:1px;border-bottom-right-radius:1px\">\n<p>Fracture-mechanical tests have developed into an economical tool that is used pragmatically in many industrial sectors. The methods presented provide a complete picture of the material behaviour under load.<\/p>\n<p>The combination of fracture toughness testing, fatigue crack growth analysis and precise measured quantities such as the K factor, J-integral and CTOD enables sound decisions. These procedures create safety not only in new developments, but also allow the economical continued operation of existing components.<\/p>\n<p>Standardised standards such as ASTM E1820 and BS 7910 guarantee reliable and comparable results. The fields of application range from aerospace through energy technology to civil engineering.<\/p>\n<p>Fracture-mechanical tests are gaining further importance in view of rising safety requirements and longer service lives. Networking with leading experts enables the solution of complex problems by adapting to the possibilities of fracture mechanics.<\/p>\n<p>For all sectors in which safety and reliability are a priority, materials testing in fracture mechanics represents an indispensable set of instruments.<br \/>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>How can components continue to operate safely despite existing cracks? This article provides an overview of materials testing in fracture mechanics and explains how these analysis methods help to assess, predict and prevent material failure. Modern methods make it possible to assess cracks in components and welded structures with precision. Not every crack automatically leads [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3023,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-3031","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/pages\/3031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/comments?post=3031"}],"version-history":[{"count":0,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/pages\/3031\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/pages\/3023"}],"wp:attachment":[{"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/media?parent=3031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/categories?post=3031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.technical-center.de\/en\/wp-json\/wp\/v2\/tags?post=3031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}