Читать книгу Root Cause Failure Analysis - Trinath Sahoo - Страница 94

Excessive plastic deformation of the mechanical components can lead to the failure in two conditions (i) externally applied stress is beyond the yield strength limit and (ii) component is subjected to applied stress lower than yield stress but exposed to high temperature conditions enough to cause creep.

To avoid the failure by plastic deformation owing to externally applied stress more than yield strength, the cross section should be designed after taking proper factor of safety and considering the yield strength of materials of which component is to be made. For mechanical components that are expected to be exposed in high temperature, creep resistant materials should be selected so that under identical load condition, low steady‐state creep rate of creep‐resistant materials can allow desired longer creep life.