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DETERMINATION OF THE ACTING LOAD ON THE BLADES.
Fan diameter: in meter
P= pa of water gauge
P = p g h = N/ m2
Area =Π /4 x (d) 2 = m2
Total load acting on fan = P x A = N
Load acting on each blade = kg
Taking Factor of safety =1.5
So, Actual applied Load = Kg
Time of load application for each blade =30 min
Evaluate the creep to avoid the failure
Blade Mechanical Design:-
MECHANICAL TESTING (Deflection)
The fan deflection testing is carried out to ensure the quality as follows:
The fan deflection test is carried out for the predetermined load as follows:
Following observations are made on the basis of readings achieved:
The ultimate superposed load on the given sample of FRP blade was determined in Kg. No abnormal behavior was stopped for a period of 30 minutes. This however, is natural for FRP material. The maximum deflection at the outermost loading location was found in mm. After failure when the superposed loads were removed, the blade almost regained its original position, showing that even at failure the FRP material remained elastic. This is because, the failure was entirely due to de-lamination of FRP layers in the vicity of the loading point W1.
Shear stress and Bending moment in Fan
(E.g. Diagram of 6’F Fan at 20 mm wg of total Pressure)
The material used for manufacturing the hub is mild steel/ Stainless steel. The following are the properties of mild steel
The area of hub under the shear stress=? x d x t = mm2
Therefore the cross breaking shear strength of the hub N = Area under shear stress x shear stress
Total shear load acting on the hub (N) = No. of blades x centrifugal force on each blade+ Thrust load acting on all the blades
The shear strength of the hub must be greater than the total shear load acting on the hub.
Design of U bolts
The area of u bolts under the shear load = 4 xΠ/4 x d2 = mm2
Therefore the cross breaking shear strength of the u bolt = A x Fs The total shear load acting on each pair of u bolt (N) = centrifugal force acting on each blade + thrust on each blade.
The shear force acting on the I - bolts (N) = centrifugal force due to the hub and blades + thrust force acting on the bolts.
The shear strength of the u bolts must be higher than the shear load acting on the U-bolts.
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