If the coating of thickness 0.50 mm is subjected to stress reversals due to temperature as well as mechanical loadings
Every material has a stress - number of loading cycles specific curve. If you know the value of stress reached at each cycle and the number of reversals undergone by the TEFLON coating, you will have a probable lifespan for this component. Say your coating reaches 50 MPa in each stress reversal cycle, you'll be able to find out how many cycles it can withstand before in fails through fatigue by consulting the TEFLON specific curve.
Dear Pramod Vadavkar, the accuracy of prediction of PTFE coating life depends on correspondence of real stress state (for the coating) and stress state of standard specimen using in fatigue tests. The ratio of cycle assymetry, magnitude of load (or temperature induced stress) you must take into account too. Best regards
Please, take into account a relatively low adhesive strength of adhesive joint PTFE coating - base. This may become a limiting factor of lifespan which demand to carry out corresponding mechanical tests.
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