Engineering, 11.03.2020 23:07 reneewilliams20
(3) Consider using vacuum bagging technique to make a carbon/epoxy composite. The thickness of the assembly is 1.2 mm. Assuming that the pressure applied in the autoclave is 547 kPa. Determine: (12’) a). Effective stress absorbed by the fiber network. b). Pressure in the resin. c). Speed of flow of the resin out of the fiber network when viscosity =1 Pa·s. (hint: using Kozeny-Carman to estimate the permeability of fiber reinforcement and then the 1-D Darcy’s law) The fiber volume fractions are: Initial fiber volume fraction Vo = 0.50 Allowable fiber volume fraction: Va = 0.85 Final volume fraction Vf = 0.68. Fiber modulus: E = 234 GPa Fiber aspect ratio: β = 300 Fiber radius rf=3.5×10-6 m Kozeny-Carman constant k0=18
Answers: 1
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
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Engineering, 04.07.2019 18:10
Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.
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Engineering, 04.07.2019 18:20
Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?
Answers: 3
Engineering, 04.07.2019 19:10
How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?
Answers: 2
(3) Consider using vacuum bagging technique to make a carbon/epoxy composite. The thickness of the a...
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