A stainless steel bone fixation plate has a fracture toughness of 75 MPa m and an elastic modulus of 190 GPa. A stress of 620 MPa was applied that caused the largest surface crack on the plate to grow by 48% and resulted in fast fracture of the device. Determine the value of the largest surface crack (in mm) on the plate prior to loading and subsequent catastrophic failure.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.