{"id":562,"date":"2025-11-01T15:37:09","date_gmt":"2025-11-01T22:37:09","guid":{"rendered":"https:\/\/quartus.com\/?p=562"},"modified":"2025-11-01T22:23:06","modified_gmt":"2025-11-02T05:23:06","slug":"boundry-condition-testing","status":"publish","type":"post","link":"https:\/\/quartus.com\/reference\/boundry-condition-testing\/","title":{"rendered":"Boundry Condition Testing"},"content":{"rendered":"<h3><img decoding=\"async\" class=\"size-full wp-image-2951 alignright\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry1.jpg\" alt=\"\" width=\"253\" height=\"174\" title=\"\"><\/h3>\n<h3>OUTLINE<\/h3>\n<ul>\n<li>Strain gage theory overview<\/li>\n<li>Select strain gage locations<\/li>\n<li>Perform controlled static testing<\/li>\n<li>Execute operational testing<\/li>\n<li>Apply test data to correlate model<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>ELECTRONIC RESISTANCE STRAIN GAGE THEORY<\/h3>\n<p>Electrical resistance of a wire is a function of geometry<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-2953 size-full\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry2.jpg\" alt=\"\" width=\"85\" height=\"70\" title=\"\"><\/p>\n<p>Longitudinal strain is a function of change in resistance<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-2954 size-full\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry3.jpg\" alt=\"\" width=\"161\" height=\"54\" title=\"\"><\/p>\n<p>Strain can be found directly by voltage measurements<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-2954\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry3.jpg\" alt=\"\" width=\"161\" height=\"54\" title=\"\"><\/p>\n<p>Temperature influences strain gage resistance<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-2958 size-full\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry5.jpg\" sizes=\"(max-width: 321px) 100vw, 321px\" srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry5.jpg 321w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry5-300x59_1.jpg 300w\" alt=\"\" width=\"321\" height=\"63\" title=\"\"><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-2959 size-full\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry6.jpg\" sizes=\"(max-width: 494px) 100vw, 494px\" srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry6.jpg 494w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry6-300x149_1.jpg 300w\" alt=\"\" width=\"494\" height=\"245\" title=\"\"><\/p>\n<p><strong>SELECT STRAIN GAGE LOCATIONS TO GENERATE HIGH FIDELITY DATA<\/strong><img decoding=\"async\" class=\"alignright wp-image-2963 size-full entered lazyloaded\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry7.jpg\" alt=\"\" width=\"301\" height=\"278\" data-lazy-src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry7.jpg\" data-ll-status=\"loaded\" data-lazy- title=\"\"><noscript><img decoding=\"async\" class=\"alignright wp-image-2963 size-full\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry7.jpg\" alt=\"\" width=\"301\" height=\"278\" title=\"\"><\/noscript><\/p>\n<ul>\n<li>\u00a0 Install at least one strain gage for each boundary condition\n<ul>\n<li>Additional strain gages provide redundancy<\/li>\n<li>Redundancy protects against gage failure<\/li>\n<\/ul>\n<\/li>\n<li>Select locations with large amplitude response\n<ul>\n<li>Wish to maximize signal to noise ratio<\/li>\n<\/ul>\n<\/li>\n<li>Find locations with low strain gradients\n<ul>\n<li>High strain gradient locations are difficult to correlate<\/li>\n<\/ul>\n<\/li>\n<li>Implement appropriate strain gage setup<\/li>\n<\/ul>\n<p><strong>DEVELOP LINEAR RELATIONSHIPS WITH STATIC TESTING<\/strong><img decoding=\"async\" class=\"size-medium wp-image-2964 alignright entered lazyloaded\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8-300x227.jpg\" sizes=\"(max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8-300x227.jpg 300w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8.jpg 330w\" alt=\"\" width=\"300\" height=\"227\" data-lazy-srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8-300x227.jpg 300w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8.jpg 330w\" data-lazy-sizes=\"(max-width: 300px) 100vw, 300px\" data-lazy-src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8-300x227.jpg\" data-ll-status=\"loaded\" data-lazy- title=\"\"><noscript><img decoding=\"async\" class=\"size-medium wp-image-2964 alignright\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8-300x227.jpg\" alt=\"\" width=\"300\" height=\"227\" srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8-300x227.jpg 300w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry8.jpg 330w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/noscript><\/p>\n<ul>\n<li>Install strain gages onto structure\n<ul>\n<li>Account for environmental effects\n<ul>\n<li>Apparent strain due to temperature<\/li>\n<li>EMF causing current and voltage shifts<\/li>\n<\/ul>\n<\/li>\n<li>Apply boundary conditions through static testing<\/li>\n<li>Generate Strain Versus Load Plots<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>VERIFY OPERATIONAL BOUNDARY CONDITIONS THROUGH TESTING<\/strong><\/p>\n<p><img decoding=\"async\" class=\"size-medium wp-image-2965 alignright entered lazyloaded\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9-300x233.jpg\" sizes=\"(max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9-300x233.jpg 300w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9.jpg 321w\" alt=\"\" width=\"300\" height=\"233\" data-lazy-srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9-300x233.jpg 300w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9.jpg 321w\" data-lazy-sizes=\"(max-width: 300px) 100vw, 300px\" data-lazy-src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9-300x233.jpg\" data-ll-status=\"loaded\" data-lazy- title=\"\"><noscript><img decoding=\"async\" class=\"size-medium wp-image-2965 alignright\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9-300x233.jpg\" alt=\"\" width=\"300\" height=\"233\" srcset=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9-300x233.jpg 300w, https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry9.jpg 321w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/noscript><\/p>\n<ul>\n<li>Replicate static test setup on operational structure\n<ul>\n<li>Install data acquisition system (DAQ) on structure<\/li>\n<li>Route wires and instrumentation such that structural behavior is unaffected<\/li>\n<li>Account for environmental effects such as EMF and temperature<\/li>\n<li>Perform operational testing<\/li>\n<li>Examine data and look for \u2018events\u2019 of interest<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>APPLY TEST DATA TO CORRELATE MODEL<\/strong><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-2969 entered lazyloaded\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry10.jpg\" alt=\"\" width=\"274\" height=\"249\" data-lazy-src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry10.jpg\" data-ll-status=\"loaded\" data-lazy- title=\"\"><noscript><img decoding=\"async\" class=\"alignnone size-full wp-image-2969\" src=\"https:\/\/quartus.com\/wp-content\/uploads\/2025\/11\/boundry10.jpg\" alt=\"\" width=\"274\" height=\"249\" title=\"\"><\/noscript><\/p>\n<ul>\n<li>Apply measured loads from operational testing\n<ul>\n<li>Correlate measured strain gage response to FEM response<\/li>\n<li>Adjust material properties, boundary conditions, and theoretical connections as required<\/li>\n<\/ul>\n<\/li>\n<li>Set goals for correlation\n<ul>\n<li>Reality != Theory<\/li>\n<li>Correlation goals depend on structure<\/li>\n<\/ul>\n<\/li>\n<li>Retest if necessary\n<ul>\n<li>More gages<\/li>\n<li>At least one gage for each load<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>SUMMARY<\/h3>\n<ul>\n<li>Select strain gage locations<\/li>\n<li>Perform controlled static testing<\/li>\n<li>Execute operational testing<\/li>\n<li>Apply test data to correlate model<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>An overview of strain gage testing and model correlation methods used in aerospace engineering and structural dynamics. Learn how precise strain measurements, static and operational testing, and model correlation techniques enhance accuracy in engineering system solutions and validation.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-562","post","type-post","status-publish","format-standard","hentry","category-reference"],"_links":{"self":[{"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/posts\/562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/comments?post=562"}],"version-history":[{"count":3,"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/posts\/562\/revisions"}],"predecessor-version":[{"id":602,"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/posts\/562\/revisions\/602"}],"wp:attachment":[{"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/media?parent=562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/categories?post=562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quartus.com\/wp-json\/wp\/v2\/tags?post=562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}