{"id":64,"date":"2016-09-05T07:01:11","date_gmt":"2016-09-05T07:01:11","guid":{"rendered":"http:\/\/www.digitool.org\/blog\/?p=64"},"modified":"2016-09-27T18:55:19","modified_gmt":"2016-09-27T18:55:19","slug":"bolted-joint-design-example","status":"publish","type":"post","link":"https:\/\/www.digitool.org\/blog\/2016\/09\/05\/bolted-joint-design-example\/","title":{"rendered":"Bolted Joint Design Example"},"content":{"rendered":"

This case study\u00a0investigates how to use the\u00a0Bolted Connection Designer<\/a>\u00a0(BCD) tool to analyse a pre-loaded 6 bolt connection in uniaxial bending.<\/p>\n

In order to use the free\u00a0BCD you will need to register with the Digitool site<\/a>. After registration\u00a0you will be redirected to the Digitool homepage\u00a0and you will be\u00a0able to launch the BCD from the Digitools menu. A new bolted\u00a0connection can be created by selecting “New Connection”\u00a0 from the Action Menu. You will then be presented with the Add Connection Screen. On this screen the connection and material\u00a0properties\u00a0are set along with the\u00a0applied forces and moments\u00a0for the connection.<\/p>\n

For this particular\u00a0problem the\u00a0connection\u00a0properties\u00a0are\u00a0shown in the image below (Fig 1). Initially the\u00a0thread chosen\u00a0is an estimate and\u00a0can be changed\u00a0later to ensure the\u00a0bolts are designed with the required factor of safety. The bolt length is\u00a0stipulated at this stage and is broken down into two\u00a0lengths.\u00a0The unthreaded length is the length of bolt shank in the grip. The threaded length is the length of thread in the grip. The grip length\u00a0is defined by the combined\u00a0thickness of all\u00a0of the joint\u00a0members which are put in compression by the bolt.<\/p>\n

\"props\"<\/p>\n

Fig 1\u00a0– Connection Properties<\/em><\/p>\n

The forces and moments applied to the connection are prescribed when the connection is set up. See the image below (Fig 2) for the values used in this case study :-<\/p>\n

\"inps\"<\/p>\n

Fig\u00a02\u00a0– Forces and Moments Applied to the Bolted Connection<\/em><\/p>\n

It is important to note that there is a sign convention used in the bolt design software. See the image below (Fig 3):-<\/p>\n

\"triad\"<\/p>\n

Fig\u00a03\u00a0– Sign Convention<\/em><\/p>\n

Forces are positive when they act in the direction of the arrows shown in the figure above. Moments are positive when they act in a clockwise direction looking down the arrow towards the centre of the triad.<\/p>\n

The material properties for the connection are defined below :-<\/p>\n

\"mat_props\"Fig\u00a04 – Material Properties<\/em><\/p>\n

The calculation is executed when a bolt is first added to the connection and then for all additional bolts thereafter. The bolted joint in this case study is defined by the bolt positions below:-<\/p>\n

\"bolts\"Fig 5- Bolt Positions<\/em><\/p>\n

After the last bolt is added\u00a0you\u00a0can then check the bolt stress for this bolted joint\u00a0by clicking on the “Display Stress” link from the Connection View page.<\/p>\n

The output should look like the following image (Fig 6):-<\/p>\n

\"disp\"Fig\u00a06 – Bolt Stress Plot<\/em><\/p>\n

As can be seen from Fig 6 this connection would be satisfactory and would sustain the applied moment. All of the properties used to initialise this connection can be altered and the stress plot will update in response to any changes.<\/p>\n","protected":false},"excerpt":{"rendered":"

This case study\u00a0investigates how to use the\u00a0Bolted Connection Designer\u00a0(BCD) tool to analyse a pre-loaded 6 bolt connection in uniaxial bending. In order to use the free\u00a0BCD you will need to register with the Digitool site. After registration\u00a0you will be redirected to the Digitool homepage\u00a0and you will be\u00a0able to launch the BCD from the Digitools menu. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/posts\/64"}],"collection":[{"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/comments?post=64"}],"version-history":[{"count":8,"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/posts\/64\/revisions"}],"predecessor-version":[{"id":75,"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/posts\/64\/revisions\/75"}],"wp:attachment":[{"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/media?parent=64"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/categories?post=64"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.digitool.org\/blog\/wp-json\/wp\/v2\/tags?post=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}