3. A motor is connected by a belt to pulley B. T2 is the tight-side tensile force equal to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of the belt has a tension equal to th of the tight side.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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3. A motor is connected by a belt to pulley B. T, is the tight-side tensile force equal
to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered
by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of
the belt has a tension equal to th of the tight side.
b
T
T,
B
d shaft
Dimensions are as follows:
da
200 тm 300 тт | 250 тm |180 тm | 250 тm 26 тm
dB
dahaft
a
We analyzed a problem similar to this on Test 01 using static failure theories. Is
this strictly correct? Because the shaft is spinning, would not a material particle
see a time-varying reversal of the the bending stress as in the R.R. rotating beam
test? Would a particle see a reversal of the torsional shear stress?
Assume Sut = 370 MPa and Sy = 300 MPa. Ignore Marin factors. Ignore stress
concentrations. Ignore direct shear stress (that due to V). Find the safety factors
with respect to fatigue and yielding. Be guided by section 6-14 on combined
loading.
Transcribed Image Text:3. A motor is connected by a belt to pulley B. T, is the tight-side tensile force equal to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of the belt has a tension equal to th of the tight side. b T T, B d shaft Dimensions are as follows: da 200 тm 300 тт | 250 тm |180 тm | 250 тm 26 тm dB dahaft a We analyzed a problem similar to this on Test 01 using static failure theories. Is this strictly correct? Because the shaft is spinning, would not a material particle see a time-varying reversal of the the bending stress as in the R.R. rotating beam test? Would a particle see a reversal of the torsional shear stress? Assume Sut = 370 MPa and Sy = 300 MPa. Ignore Marin factors. Ignore stress concentrations. Ignore direct shear stress (that due to V). Find the safety factors with respect to fatigue and yielding. Be guided by section 6-14 on combined loading.
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