Calculate the final critical surface crack length if the fatigue life of a material with a Kic of 25 Mpa m1/2 must be a minimum of 6.6 x 105 cycles. Assume the initial maximum edge surface crack to be 1.1 mm and the maximum tensile stress of 137MPa. Assume m=1.3, and A = 7.5x10-13 and Y = 1.19. The answer should be in mm with 2 decimals of accuracy.

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?