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