A manufacturer wishes to choose between two ceramics for acertain application. Data for the two ceramics tested underidentical 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 testconditions and impose a stress of 300 MPa. By constructing Weibullgraphs with S = 1/2 for mean fracture stress or any other method,decide which ceramic will be more reliable and compare theprobabilities of failure at 300 MPa. At what stress would the twoceramics give equal performance?
Answer: Stress for equal performance = 349 MPa