Testing of Creep

 Testing of Creep

Metal part when is subjected to a high constant stress at high temperature for a longer period of time, it will undergo a slow and permanent deformation (in form of a crack which may further propagate further towards creep failure) called creep. Creep is time dependent phenomena of metal failure at high constant stress and at high temperature such subjecting of at steam turbine blade. A schematic creep testing setup is shown in Fig. 1 Test is carried out up to the failure of the test specimen. A creep curve for high temperature and long time creep is shown in Fig. 2. The curve shows different portions of the primary secondary and tertiary creep which ends at fracture in metals.


Creep curve for a high temperature and long time creep test
Fig 2:Creep curve for a high temperature and long time creep test


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