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Two engineering alloys, of the same overall yield strength (300 MPa) and elastic properties, are being considered as candidate materials for a particular structural application. Material 1 has a grain size of lOjim, while the grain size of Material 2 is 220 jim. Both alloys fail in an intergranular fracture mode by the nucleation, growth and coalescence of voids at grain boundaries. The structural component, for which the alloys are being considered, is subjected to a tensile stress of 85 MPa. It contains a through thickness single edge crack of length a = 25 mm. The thickness of the part containing the crack is 30 mm and its width is 100 mm. (The equations necessary to calculate the stress intensity factor for this problem can be found in the Appendix.)
(a) Comment on the extent and validity of /-dominance for the two materials under consideration.
(b) An examination of the ASTM standard (E813) for elastic-plastic fracture toughness testing of these two materials reveals the requirement that the depth of the initial crack (i.e. the notch length plus the length of the fatigue pre-crack) be at least one-half of the width of the specimen (e.g., compact tension, three-point bend specimen, or four-point bend specimen). Why?
A steel tube has an outside diameter of 2.5 inches and an inside diameter of 2.375 (1/8" thick). If it transmits 35 hp when turning at 2700 rpm, what is the maximum shear stress
The inlet conditions are Ma1= 1.2, T01= 350 K, and P01 =240 kPa and the exit Mach number is Ma2= 2.0. Disregarding frictional effects, determine the rate of cooling of air.
Assuming that the nozzle is well insulated and operating at steady state and that the air behaves as an ideal gas, calculate (a) the mass flow rate of air in kg/s, (b) the exit area of the nozzle in m^2,
The steel beam ABCD is simply supported at A (pin) and supported at B and D by steel cables each having a diameter of 12mm. A force of 20 kN is applied at point C. For steel, let E = 209 GPa.
Calculate the time average F of the total force tangent to the toad exerted on the tires during the 8 s. Treat the car as a particle and neglect air resistance.
A nylon thread is to be subjected to a 10-N tension. Knowing that E=3.2 GPa, that the maximum allowable normal stress is 40 MPA, and that the length of the thread must not increase by more than 1%
A rectangular steel plate with thickness t=0.625 inches is subjected to normal stresses sigma x and sigma y.The strain in the x direction is known to be 0.00065 and the strain in the y direction is known to be 0.0004
A traffic engineer is trying to design a left turn bay on an EB approach to an intersection. The signal timing for left turns will have 10 seconds of “left turn only” green time and 50 seconds of red time each signal cycle. The green time will be suf..
The tank material is such that it can withsatand tension caused by a volume expansion of 2%. Determine the max temperature rise in Celcius degress allowed without jeopardizing safety.
an embarkment will be constructed with the soil compacted to 95 percent of the max dry density. the borrow material, is deposited at a uniform density of 75 percent of the max dry density. the roadway embankment will require 75,000 cubic yards of ..
Titan, a moon of Saturn, is believed by astronomers to have an atmosphere that is about 95% nitrogen. At Titan's surface the acceleration due to gravity is 1.35 m/s2, the atmospheric pressure is 210 kPa, and the temperature is 94 K.
A city near the epicenter of an earthquake sustains major damage to poorly constructed building, althought hospital and schools designed to resist dmage from ground motion sustsain only minor damage.
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