{"id":1669,"date":"2014-10-21T11:07:38","date_gmt":"2014-10-21T09:07:38","guid":{"rendered":"http:\/\/www.pasqualerobustini.com\/blog\/?page_id=1669"},"modified":"2015-11-24T13:58:28","modified_gmt":"2015-11-24T12:58:28","slug":"sforzo-e-deformazione","status":"publish","type":"page","link":"https:\/\/www.pasqualerobustini.com\/en\/geologia\/elementi-di-geodinamica\/sforzo-e-deformazione\/","title":{"rendered":"Stress and strain"},"content":{"rendered":"<p>When a continuum body is acted upon by external forces, internal forces will appear and they will act upon each single particles in the medium. By ideally removing a portion of the continuum body, we could observe the distribution of internal forces: for each infinitesimal surface AA there is a corresponding infinitesimal force \u0394F acting upon it.<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.pasqualerobustini.com\/wp-content\/uploads\/2014\/10\/geodin-forze-interne.png\"><img class=\"aligncenter wp-image-1671\" src=\"http:\/\/www.pasqualerobustini.com\/wp-content\/uploads\/2014\/10\/geodin-forze-interne.png\" alt=\"geodin-forze interne\" width=\"419\" height=\"277\" srcset=\"https:\/\/www.pasqualerobustini.com\/wp-content\/uploads\/2014\/10\/geodin-forze-interne.png 731w, https:\/\/www.pasqualerobustini.com\/wp-content\/uploads\/2014\/10\/geodin-forze-interne-300x198.png 300w\" sizes=\"(max-width: 419px) 100vw, 419px\" \/><\/a><span style=\"font-size: 8pt;\"><em>Internal body forces in a continuum<\/em><\/span><\/p>\n<p style=\"text-align: left;\">The stress vector is defined as T(n) = <a href=\"http:\/\/www.pasqualerobustini.com\/wp-content\/uploads\/2014\/10\/geodin-formula1.png\"><img class=\"alignnone wp-image-1670 size-full\" src=\"http:\/\/www.pasqualerobustini.com\/wp-content\/uploads\/2014\/10\/geodin-formula1.png\" alt=\"geodin-formula1\" width=\"85\" height=\"46\" \/><\/a> , which varies with the orientation of AA. Applying the <strong>stress<\/strong> upon a materiel causes a change of shape: any single point in the body is subject to a <strong>displacement<\/strong>. The resulting <strong>shape change<\/strong>\u00a0or deformation is called <strong>strain<\/strong>. Strain is a function of body properties such as density, rigidity (or shear resistance) and compressibility (resistance to volume change). These properties are known as <strong>elastic moduli<\/strong>.<\/p>\n<p style=\"text-align: left;\">The study of the relationships between applied stress and subsequent strain is called &#8220;<strong>reology<\/strong>&#8220;.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>When a continuum body is acted upon by external forces, internal forces will appear and they will act upon each single particles in the medium. By ideally removing a portion of the continuum body, we could observe the distribution of internal forces: for each infinitesimal surface AA there is a corresponding infinitesimal force \u0394F acting [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1659,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/pages\/1669"}],"collection":[{"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/comments?post=1669"}],"version-history":[{"count":8,"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/pages\/1669\/revisions"}],"predecessor-version":[{"id":3964,"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/pages\/1669\/revisions\/3964"}],"up":[{"embeddable":true,"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/pages\/1659"}],"wp:attachment":[{"href":"https:\/\/www.pasqualerobustini.com\/en\/wp-json\/wp\/v2\/media?parent=1669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}