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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 moist soil sample wights 346g.After drying at 105 degree celsius it then wights 284g.the specific gravity of the mass and of the soil is 1.86 and 2.70.
Three days later, Abu sees his solicitors and executed the transfer of his said bungalow to Abdul Samad at the said value. Two month later, Abdul Samad expelled Abu from the religious group. Abu now wants to set aside the sale of his bungalow.
The service live load is three times the dead load. The 4-in leg contains a single line of 7/8 inch diameter bolts, and the 6 inch leg contains a double gage line of 7/8 inch diameter bolts.
The pressure in the steam condenser of a nuclear power plant is 1 psia. Calculate the absolute pressure head, the gage pressure, the gage pressure head, the vacuum pressure, and the vacuum pressure head under standard conditions.
A pipeline 900 ft long discharges freely at a point 200 ft lower than the water surface at intake. The pipe intake projects into the reservoir. The first 600 ft is of 10-in diameter, and the remaining 300 ft is of 6-in diameter.
A gray silty clay (CL) is sampled from a depth of 12.5 feet. The "moist" soil was extruded ffrom a 6-inch high brass liner with an inside diameter of 2.83 inches and weighed 777 grams.
An electrostatic precipitator (ESP) is being designed to collect flue gas particles at a power plant. The following information has been collected: electric field intensity = 100,000 V/m, and average particle charge = 0.30 fC (1 fC = 10-15 C).
The driver of a car traveling up a 2% grade at an initial speed of Vo applied the brakes abruptly and the vehicle slid to a complete stop at an average deceleration of 8ft/s^s. Was the pavement wet or dry?
The dimensionless henry's constant for TCE at 25 degrees celsius is 0.4. A sealed glass vial is prepared that has an air volum of 4mL overlying an aquesous volume of 36mL.
A 4-m- long, 6-cm-diameter cylinder placed normal to the flow is used to measure the velocity of an air stream. If a force of 50N is measured. What is the air velocity in m/s?
In dating using radiocarbon, the amount of C^14 remaining at the time of measurement is expresed as a percentage of modern carbon. For example that the 30% modern carbon
Given the heat transfer of the disk rotor is 120 W/m2/K, how much heat energy is radiatred from each of the disk rotors when the ambient air temperature is 30 C
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