{"id":588,"date":"2023-03-14T14:41:28","date_gmt":"2023-03-14T14:41:28","guid":{"rendered":"https:\/\/more.bham.ac.uk\/M4X\/?page_id=588"},"modified":"2024-06-18T11:04:16","modified_gmt":"2024-06-18T10:04:16","slug":"sub-scale-three-and-four-point-flexural-testing","status":"publish","type":"page","link":"https:\/\/more.bham.ac.uk\/M4X\/techniques\/sub-scale-three-and-four-point-flexural-testing\/","title":{"rendered":"(Sub-scale) Three- and four- point flexural testing"},"content":{"rendered":"\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-30be4dc\" data-block-id=\"30be4dc\"><style>.stk-30be4dc{height:40px !important}<\/style><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Three-point flexural testing (or three-point bending) is a mechanical testing technique in&nbsp;which a cuboidal sample of a material is suspended on two support pins, and bent by lowering a third pin through its centre. The force required to lower&nbsp;the pin and bend the sample is recorded, and this data can be used to calculate a flexural stress-strain response for the material. This can then be used to analyse the deformation and fracture properties of the material, and compare it to other materials.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\" id=\"attachment_199\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/more.bham.ac.uk\/M4XE\/wp-content\/uploads\/sites\/37\/2020\/09\/3-point-300x136.png\" alt=\"\" class=\"wp-image-199\" width=\"320\" height=\"145\" srcset=\"https:\/\/more.bham.ac.uk\/M4X\/wp-content\/uploads\/sites\/37\/2020\/09\/3-point-300x136.png 300w, https:\/\/more.bham.ac.uk\/M4X\/wp-content\/uploads\/sites\/37\/2020\/09\/3-point-768x348.png 768w, https:\/\/more.bham.ac.uk\/M4X\/wp-content\/uploads\/sites\/37\/2020\/09\/3-point.png 966w\" sizes=\"auto, (max-width: 320px) 100vw, 320px\" \/><figcaption class=\"wp-element-caption\"><strong>Figure One<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">In four-point bending,&nbsp;two central pins are lowered to bend the sample. This creates a larger region of the sample that is maximally stressed, providing more reliable results.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Usually, mechanical tests require relatively large samples. This is not always a feasible option for expensive or exotic alloys that we may only produce in small quantities. Sub-scale three-point bending is suited towards samples as small as 12mm long and 1mm thick, and is ideal for analysing materials\u00a0with limited volume.<\/p>\n\n\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-5c12886\" data-block-id=\"5c12886\"><style>.stk-5c12886{height:40px !important}<\/style><\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Figures<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Figure One: Three point bending (Heymer, 2020)<\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Three-point flexural testing (or three-point bending) is a mechanical testing technique in&nbsp;which a cuboidal sample of a material is suspended on two support pins, and bent by lowering a third pin through its centre. The force required to lower&nbsp;the pin and bend the sample is recorded, and this data can be used to calculate a &#8230; <a title=\"(Sub-scale) Three- and four- point flexural testing\" class=\"read-more\" href=\"https:\/\/more.bham.ac.uk\/M4X\/techniques\/sub-scale-three-and-four-point-flexural-testing\/\" aria-label=\"More on (Sub-scale) Three- and four- point flexural testing\">Read more<\/a><\/p>\n","protected":false},"author":2496,"featured_media":0,"parent":49,"menu_order":8,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-588","page","type-page","status-publish"],"featured_image_urls_v2":{"full":"","thumbnail":"","medium":"","medium_large":"","large":"","1536x1536":"","2048x2048":"","ab-block-post-grid-landscape":"","ab-block-post-grid-square":""},"post_excerpt_stackable_v2":"<p>Three-point flexural testing (or three-point bending) is a mechanical testing technique in&nbsp;which a cuboidal sample of a material is suspended on two support pins, and bent by lowering a third pin through its centre. The force required to lower&nbsp;the pin and bend the sample is recorded, and this data can be used to calculate a flexural stress-strain response for the material. This can then be used to analyse the deformation and fracture properties of the material, and compare it to other materials. Figure One In four-point bending,&nbsp;two central pins are lowered to bend the sample. This creates a larger region&hellip;<\/p>\n","category_list_v2":"","author_info_v2":{"name":"Ross Conway","url":"https:\/\/more.bham.ac.uk\/M4X\/author\/conwayry\/"},"comments_num_v2":"0 comments","featured_image_src":null,"featured_image_src_square":null,"_links":{"self":[{"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/pages\/588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/users\/2496"}],"replies":[{"embeddable":true,"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/comments?post=588"}],"version-history":[{"count":3,"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/pages\/588\/revisions"}],"predecessor-version":[{"id":859,"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/pages\/588\/revisions\/859"}],"up":[{"embeddable":true,"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/pages\/49"}],"wp:attachment":[{"href":"https:\/\/more.bham.ac.uk\/M4X\/wp-json\/wp\/v2\/media?parent=588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}