題組內容

7. (Total:15 %) Two plants are prepared form the X alloy and Z ceramic, and their fracture toughness values are 60 and 5 61d6918d7a747.jpg. The alloy and ceramic plates are exposed to the same tensile stress of 375MPa.

(1) Please determine the minimum length of surface cracks for this alloy and ceramic. Assume the value of 1.5 for Y dimensionless constant (10%).