Engineering, 02.12.2019 18:50 drivinghydra

# The manufacturer of a product that is subjected to repetitive cycles has specified that the product should be removed from service when any crack reaches 15% of the critical crack length required to cause fracture. consider a crack that is initially 0.02 mm long in a material with a fracture toughness of 55 mpa âˆšm . the product is continuously cycled between compressive and tensile stresses of 300 mpa at a constant frequency. assume external cracks for which f = 1.12. the materials constants for these units are n = 3.4 and c = 2 Ã— 10-11.

(a) what is the critical crack length required to cause fracture?

(b) how many cycles will it take for the product to be removed from service as specified by the manufacturer,

(c) assuming the specifications were not followed, how many cycles will it take for product to fail? (2+3+3 = 8 points)

Answers: 3

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Amass of 1.5 kg of air at 120 kpa and 24Â°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

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Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

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Engineering, 04.07.2019 17:20

Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 Â°c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process

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