Alarge, flat plate is subjected to constant-amplitude uniaxial cyclic tensile and compressive stresses of 120 and 35 mpa, respectively. if before testing the largest surface crack is 1.00 mm and the plain-strain fracture toughness of the plate is 35 mpa √ __ m , estimate the fatigue life of the plate in cycles to failure. for the plate, m = 3.5 and a = 5.0 × 10−12 in mpa and m units. assume y = 1.3.

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

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Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?