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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.
draw the free-body diagram and write the corresponding elemental equation for a spring element with the following
Air enters an adiabatic nozzle at 60 psia and 1020°F with low velocity and exits at 800 ft/s. If the isentropic efficiency of the nozzle is 90 percent, determine the exit temperature and pressure of the air.
a pulley of moment of inertia i is fixed on a shaft of polar second moment of area j and shear modulus g. the shaft is
a particle moves along a hyperbolic path defined by the equation x216 - y2 28. if the x component of velocity is vx 4
The motion of a particle in defined by the relation x = t3 - 15 t2 - 20, where ‘x' is expressed in metres and ‘t' in seconds. Determine the acceleration of the particle at t = 3 seconds.
The odd parity bit for all data received since the circuit was reset. This output should be 0 the clock cycle after a reset since no zeroes or ones have been received by the circuit at that point.
an air-water-vapor mixture enters a cooling apparatus at 40 degrees c and relative humidity is 80 percent. design calls
the liquid in a pool has a linearly varying density of the form pz a bz where z is the depth in meters and the
a particle is moving along a straight line such that when it is at the origin it has a velocity of 8 ms part a if it
What type(s) of bonding would be expected for each of the following materials? Diamond, Zirconium Oxide, Argon Gas, Rubber, Bronze (a mixture of copper and tin)
air undergoes a isentropic compression in a piston-cylinder assembly from p1- 1atm t1 70 f to p2 5 atm. assuming air
you are designing a converging-diverging nozzle to operate at sea level. the nozzle will be mounted on a glider that
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