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In: Mechanical Engineering

A manufacturer wishes to choose between two ceramics for a certain application. Data for the two...

A manufacturer wishes to choose between two ceramics for a certain application. Data for the two ceramics tested under identical conditions were as follows:

Ceramic Mean Fracture Stress Weibull Modulus
A 500 MPa 12
B 600 MPa 8

The service conditions are geometrically identical to the test conditions and impose a stress of 300 MPa. By constructing Weibull graphs with S = 1/2 for mean fracture stress or any other method, decide which ceramic will be more reliable and compare the probabilities of failure at 300 MPa. At what stress would the two ceramics give equal performance?

Answer: Stress for equal performance = 349 MPa

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