{"id":4664,"date":"2026-06-23T17:52:08","date_gmt":"2026-06-23T09:52:08","guid":{"rendered":"https:\/\/www.nlscientific.com\/rebar-tensile-bend-test-iso-15630-astm-a615\/"},"modified":"2026-06-23T17:52:08","modified_gmt":"2026-06-23T09:52:08","slug":"rebar-tensile-bend-test-iso-15630-astm-a615","status":"publish","type":"post","link":"https:\/\/www.nlscientific.com\/en_ph\/rebar-tensile-bend-test-iso-15630-astm-a615\/","title":{"rendered":"Rebar Tensile &#038; Bend Test (ISO 15630 \/ ASTM A615): Method &#038; Apparatus"},"content":{"rendered":"<p>The <strong>rebar tensile and bend test<\/strong> verifies the mechanical properties of reinforcing steel \u2014 yield strength, tensile strength, elongation and ductility \u2014 to ISO 15630-1 and ASTM A615.<\/p>\n<h2>What the Test Measures<\/h2>\n<p>A universal testing machine pulls a full-size bar to failure to measure yield and tensile strength and elongation, while a bend (and rebend) test on a mandrel confirms the steel&#8217;s ductility and freedom from cracking.<\/p>\n<h2>Apparatus Required<\/h2>\n<ul>\n<li>Universal testing machine of adequate capacity with tensile grips<\/li>\n<li>Extensometer for yield and elongation measurement<\/li>\n<li>Bend\/rebend device with mandrels of specified diameter<\/li>\n<li>Gauge-length marking tools<\/li>\n<\/ul>\n<p>NL Scientific manufactures the <a href=\"https:\/\/www.nlscientific.com\/en_ph\/product\/electro-hydraulic-servo-control-universal-testing-machine-multi-wire-strand-1200kn\/\">ELECTRO-HYDRAULIC Servo Control Universal Testing Machine<\/a> and the full <a href=\"https:\/\/www.nlscientific.com\/en_ph\/product-category\/steel\/\">steel testing range<\/a>, built to ASTM, EN, BS and AASHTO requirements with ISO\/IEC 17025 accredited calibration.<\/p>\n<h2>Test Procedure<\/h2>\n<ol>\n<li>Measure the bar and mark the gauge length.<\/li>\n<li>Grip the bar and apply tensile load, recording the yield point and maximum load.<\/li>\n<li>Continue to fracture and measure the final gauge length for elongation.<\/li>\n<li>On a separate sample, bend the bar around the specified mandrel to the required angle.<\/li>\n<li>Inspect the bend (and rebend, where required) for cracks.<\/li>\n<\/ol>\n<h2>Calculation &amp; Reporting<\/h2>\n<p>Report <strong>yield strength<\/strong> (R<sub>e<\/sub>), <strong>tensile strength<\/strong> (R<sub>m<\/sub>), the R<sub>m<\/sub>\/R<sub>e<\/sub> ratio and <strong>percentage elongation<\/strong>, plus a pass\/fail for the bend test.<\/p>\n<h2>Acceptance Criteria<\/h2>\n<p>Values must meet the grade requirements (for example, ASTM A615 Grade 60 requires a minimum yield of 420 MPa) with no cracking on the bend test. The R<sub>m<\/sub>\/R<sub>e<\/sub> ratio confirms adequate ductility for seismic grades.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>Why is the bend test important?<\/h3>\n<p>Tensile strength alone does not prove ductility; the bend and rebend tests confirm the bar can be bent on site without cracking.<\/p>\n<h3>What machine capacity is needed for rebar?<\/h3>\n<p>Large-diameter and high-grade bars need a high-capacity servo-hydraulic universal testing machine; capacity is selected from the largest bar size and grade to be tested.<\/p>\n<p><em>Need the right equipment for your laboratory?<\/em> <a href=\"https:\/\/www.nlscientific.com\/en_ph\/contact-us\/\">Contact NL Scientific for a quotation<\/a> &mdash; Asia&#8217;s leading manufacturer of civil engineering and material testing equipment, shipping worldwide.<\/p>","protected":false},"excerpt":{"rendered":"<p>Reinforcing steel tensile and bend test (ISO 15630-1 \/ ASTM A615): yield, tensile strength, elongation, bend\/rebend and acceptance.<\/p>","protected":false},"author":1,"featured_media":4012,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"rank_math_lock_modified_date":false,"footnotes":""},"categories":[164],"tags":[],"class_list":["post-4664","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts\/4664","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/comments?post=4664"}],"version-history":[{"count":0,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/posts\/4664\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/media\/4012"}],"wp:attachment":[{"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/media?parent=4664"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/categories?post=4664"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nlscientific.com\/en_ph\/wp-json\/wp\/v2\/tags?post=4664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}