{"id":28135,"date":"2020-12-09T07:38:36","date_gmt":"2020-12-09T07:38:36","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=28135"},"modified":"2023-08-11T05:21:23","modified_gmt":"2023-08-11T05:21:23","slug":"stages-of-creep-primary-secondary-tertiary","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-engineering\/materials-science\/material-properties\/creep-material-creep\/stages-of-creep-primary-secondary-tertiary\/","title":{"rendered":"Stages of Creep – Primary – Secondary – Tertiary"},"content":{"rendered":"
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\"stages<\/a>Creep<\/strong>, also known as cold flow<\/strong>, is the permanent deformation that increases with time under constant load or stress<\/a>. It results from long-time exposure to large external mechanical stress within the limit of yielding and is more severe in materials subjected to heat for a long time. The rate of deformation is a function of the material’s properties, exposure time, exposure temperature<\/a>, and the applied structural load. Creep<\/strong> is very important if we use materials at high temperatures<\/strong>. Creep is very important in the power industry and is of the highest importance in designing jet engines. Time to rupture is the dominant design consideration for many relatively short-life creep situations (e.g., turbine blades<\/a> in military aircraft). Of course, for its determination, creep tests must be conducted to the point of failure, termed creep rupture tests<\/strong>.<\/p>\n

Stages of Creep<\/h2>\n

As can be seen from the figure, creep<\/strong> is time-dependent, and it goes through several stages:<\/p>\n