Engineering, 02.12.2019 18:50

# 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 √m . 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 × 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

Engineering, 03.07.2019 12:20

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Answers: 2

Engineering, 03.07.2019 12:20

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Answers: 3

Engineering, 03.07.2019 12:30

Ahouse has the following electrical appliance usage (1) single 40w lamp used for 4 hours per day (2) single 60w fan used for 12 hours per day (3) single 200w refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours find the solar power inverter size in watt with correction factor of 1.25.

Answers: 1

Engineering, 03.07.2019 12:30

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.

Answers: 1

The manufacturer of a product that is subjected to repetitive cycles has specified that the product...

Mathematics, 16.01.2019 23:20

Mathematics, 16.01.2019 23:20

English, 16.01.2019 23:19

Mathematics, 16.01.2019 23:19

Chemistry, 16.01.2019 23:19

French, 16.01.2019 23:19

Arts, 16.01.2019 23:18

Mathematics, 16.01.2019 23:18

History, 16.01.2019 23:18

Mathematics, 16.01.2019 23:18

Chemistry, 16.01.2019 23:18

Mathematics, 16.01.2019 23:18

Mathematics, 16.01.2019 23:18

Chemistry, 16.01.2019 23:17