Q1: Figure below shows a rotating stepped shaft supported by ball bearings at A and B and loaded by a nonrotating force P and torque T. Determine the factor of safety Nr, if: P=6 KN, T=650 KN.m, oy = 600 MPa, oul = 1200 MPa, and the torque fluctuates 20% each way from mean value. Assumption: The shaft is to be hot rolled from steel, reliability 50%, notch radius 2.5 mm, operation temperature 450 C°. All dimensions in mm.

Q1: Figure below shows a rotating stepped shaft supported by ball bearings at A and B and loaded by a nonrotating force P and torque T. Determine the factor of safety Nr, if: P=6 KN, T=650 KN.m, oy = 600 MPa, oul = 1200 MPa, and the torque fluctuates 20% each way from mean value. Assumption: The shaft is to be hot rolled from steel, reliability 50%, notch radius 2.5 mm, operation temperature 450 C°. All dimensions in mm.

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter3: Torsion

Section: Chapter Questions

Problem 3.7.8P: A tubular shaft being designed for use on a construction site must transmit 120 kW at 1,75 Hz, The...

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A tubular shaft being designed for use on a construction site must transmit 120 kW at 1,75 Hz, The inside diameter of the shaft is to be one-half of the outside diameter. If the allowable shear stress in the shaft is 45 MPa, what is the minimum required outside diameter d?
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Repeat Problem 10.3-15 using L = 3.5 m, max = 3 mm, and EI = 800 kN·m2.
Q2: shaft shown has: FB=0; FA=200 Ib; T=1000 Ib.in; The shaft rotating freely on bearings A and B and has reactions there (Ra,Rb); For the step take Kt =1.7 for bending and Kts= 2.2 for torsion and the material sensitivity factor is 0.8; The corrected endurance limit for the shaft material is 20 Kspi Safety factor =2 D=1.2 d Out = 140 MPa, Out=70 Mpa Find the small diameter d suitable for that shaft. 6 in 6 in 6 in d. Rb
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Figure below shows a rotating shaft simply supported in ball bearings at A and D and loaded by a nonrotating orce Fof 6.8 kN. Using ASTM "minimum" strengths, estimate the life of the part. 6T td7 (a) Shaft drawing showing all dimensions in millimeters; all fillets 3-mm radius. The shaft rotates and the load is stationary; material is machined from AISI 1050 cold-drawn steel. (b) Bending moment diagram.
Q5: A steel shaft is to transmit a stable torque of 1400 Nm to the steel spur gear through a Type B square end key with the dimensions L=140 mm and b=14 mm. What should be minimum height of the keyto transmit the power safely. The allowable bearing stress is 90 MPa.
Q1 (b): A cold-drawn solid steel shaft is driven at N=287 RPM carries two gears D andE, as shown in the figure. Gear D has an input power of Pp= 9 kW, while gear E gives an equal output power. For a factor of safety of n=2.5, design the shaft according to the following failure criteria: Assume Sy 309 MPa, Sut= 598 MPa, K=1.4, Ks =1.4 15 kg 15 kg D 0.4 m e 0.6 m 0.4 m - Calculate the mean torque, Tm in N.m units upto 4 digits after decimal. Enter only numeric value without units. Assume k = 0.81 and the shaft is operating at room temperature of 70°F with 50% reliability.
Q1 (a): A cold-drawn solid steel shaft is driven at N=295 RPM carries two gears D and E, as shown in the figure. Gear D has an input power of Pp= 11 kW, while gear E gives an equal output power. For a factor of safety of n=2.2, design the shaft according to the following failure criteria: Assume Sy= 291 MPa, Sut= 597 MPa, Kf=1.3, K=1.4 15 kg 15 kg A E 0.4 m e 0.6 m 0.4 m Calculate endurance limit, Se, in MPa units assuming all the Marin factors are unity. Enter only numeric value without units. Assume k=0.77 and the shaft is operating at room temperature of 70°F with 50% reliability.
a) The rotating step shaft is subjected to the force as shown in the figure. It is supported by bearings at A and F. The shaft is machined using AISI 1040 CD steel. Determine the minimum fatigue factor of safety based on achieving infinite life. If infinite life is not predicted, estimate the number of cycles failure. Also check for yielding. Given Data: (Notch sensitivity (q)=0.8, Sut=85 kpsi, Syield= 71 kpsi, Surface condition modification factor ka=0.879, Size modification factor kb=0.790, Load modification factor kc=1, fatigue fraction (f)=0.867) * In order to determine Kt; Use Figure A-15-9 in your textbook. Dimensions are in inch and all fillet radius:1/14 inch y 860 lbf de 1.75 1.5 1.0 1.0 B V A| D E F 0.5 8 -8.5- R1 R2 -19.5 20
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