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1. What is the magnitude of the maximum stress that exists at the tip of an internal crack hav- ing a radius of curvature of 1.9 X 10-4 mm (7.5 X 10-6 in.) and a crack length of 3.8 X 10-2 mm (1.5 X 10-3 in.) when a tensile stress of 140 MPa (20,000 psi) is applied?
2. Estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation of an elliptically shaped surface crack of length 0.5 mm (0.02 in.) and having a tip radius of curvature of 5 X
3. A specimen of a 4340 steel alloy with a plane strain fracture toughness of 54.8 MPa 1m (50 ksi 1in.) is exposed to a stress of 1030 MPa (150,000 psi). Will this specimen experience fracture if it is known that the largest surface crack is 0.5 mm (0.02 in.) long? Why or why not? Assume that the parameter Y has a value of 1.0.
Ten cubic feet of air is cooled at a constant pressure of 80 psi. The initial temperature is 180 0F and the final temperature is 100 0F. Assume air is an ideal gas, Cp = 0.241 Btu/lb 0R and Cv = 0.173 Btu/lb 0R and R = 1545 lbf/lbmol 0R, M = 28.97 lb..
the figure below shows the geometrical stress concentration factor k for a flat bar loaded in uniaxial tension. the
consider an evacuated rigid bottle of volume v that is surrounded by the atmosphere at pressure p0 and temperature t0.
Determine the maximum velocity, the maximum acceleration and the acceleration and the force acting on the component when it is 50 mm from the central position.
if a fraction of steam is removed from the turbine at 2000kpa passed through a closed water heater followed by a trap
A certain industrial process requires a steady 0.75 kg/s supply of compressed air at 500 kPa, at a maximum temperature of 30C. This air is to be supplied by installing a compressor and after cooler. Local ambient conditions are 100 kPa, 20C. Using a ..
Liquid water in a pumped flow system experiences varying pressures as it circulates through the system. One concern in designing any such system is to ensure that cavitation does not occur. If the water temperature during operation of a particular sy..
determine the pumpcompressor work input leave as kjkg required to isentropically compress water in part a as a liquid
the truck is to be towed using two ropes. if the resultant force is to be 950 directed along the positive axis
at steady state a refrigeration cycle maintains a freezer at -2degc removing energy by heat transfer from the food
A direct injection, four-stroke, six cylinder Diesel engine has 10L if displacement volume. Bore and stroke dimensions are 125mm and 136mm, respectively. The engine was designed to deliver 184 HP at 2100 RPM. Calculate the air flow rate (g/s) when pi..
A piston cylinder device contains 3 kg of air at 300 kPa and 25°C. During a quasiequilibrium isothermal expansion process, 20 kJ of boundary work is done by the system, and 8 kJ of paddlewheel work is done on the system. The heat transfer during th..
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