Anickel engine part is coated with sic to provide corrosion resistance at high temperatures. if no residual stresses are present in the part at 20°c, determine the thermal stresses that develop when the part is heated to 1000°c during use. the elastic modulus of sic is 60 × 106 psi. the coefficient of thermal expansion for sic is 4.0 x 10-6 / °c. if the sic goes past a tensile strength 25,000 psi, the coating will crack. does the thermal stress go over 25,000 psi?

σ = 235200 psi.

Yes, the thermal stresses go over 25000 psi.        

Explanation:  

The thermal stresses (σ) can be calculated by:

where α: is the Coefficient of Thermal Expansion, E: is the Young's Modulus and , : is the final temperature and : is the initial temperature.

So, when the SiC is heated to 1000 °C, it develops 235200 psi of thermal stresses.

The answer to the question is yes, the thermal stresses go over 25000 psi.    

I hope it helps you!  

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