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The specifications on a part specify that the part should be replaced when any crack reaches 25% of the critical crack length that will lead to fracture. We know that the part has an intial crack of length 0.02 mm, and that the fracture toughness is 55 MPA(m)^1/2
If the part is subject to cycle loading of 300 Mpa in tension and compression, calculate (assuming Y1.2, n = 3.4 and C = 2x10^-11 in units of Mpa m)
a-the critical crack length required to cause fracture
b-the number of cycles until the part needs replacing
c-how many cycles the part has left when it is being replaced and before it fails
The depth of the water in the flume is 3m. The average velocity is 1.7m/s. Compute the hydraulic energy at the surface of the water and at the bottom of the flume.
a rectangular bar of length l has a slot in the middle half of its length. the bar has width b, thickness t, and modulus of elasticity E. the slot has a width b/4. the stress in the middle region is 24000 psi, the length is 30 in, andthe modulus o..
There are three reactors degrading a chemical biologically, at three degradation rates; i.e., 0.2 d^-1, 0.4 d^-1, and 1.0 d^-1. The residence time of the chemical in these reactors are 10 d, 5 d, and 55 d, respectively.
how far back from the front axle would the center of gravity have to be to ensure that the maximum tractive effort developed for front- and rear- wheel-drive options is equal (assume that all other variables are unchanged)
What is the nominal distance in miles between the SW corner ofSec. 2m T 6 S, R 5E, Indiam PM and the NW corner of Sec. 17, T 6 S,R 3 E, Indian PM?
A hemispherical bowl of radius r connected to a U-tube of constant radius r. Initially the the bowl is empty and the air/manometer liquid interface in both legs is at the level of the bottom of the bowl.
A trapezoidal channel cut into rock has a bottom width of 4 ft, side slopes of 1:1 and a channel slope of 0.0005. What is the critical slope of the channel.
A rapid-mixing basin is to be designed for a water coagulation plant, and the design flow for the basin is 4.0 MGD (million gallons per day). The basin is to be square with a depth equal to 1.25 times the width.
The coefficient of friction between the crate and the floor is µs = 0.4 and µk = 0.3. If P is slowly increased until the crate starts to move and then remains constant, determine using energy methods the speed of the crate after moving 2 m.
assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
.An air turbine is used with a generator to generate electricity. Air at the turbine inlet is at 700 kPa and 25 degree C. The turbine discharges air in to the atmosphere at a temperature of 11 degree C.Inlet and outlet air velocities are 100 m/s and ..
A pendulum consists of a slender rod, AB, of weight Wr= 8.60 lb and a wooden sphere of weight Ws= 21.7 lb .(Figure 1) The length of the rod is d = 7.70 ft and the radius of the sphere is R = 0.500 ft
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