Determine the angle of twist - solid steel shaft, Mechanical Engineering

Assignment Help:

Determine the angle of twist - solid steel shaft:

A solid steel shaft 6 m long is fixed at each of the end. A torque of 3 kN-m is applied to the shaft at a section 2 m from one end. What is the fixing torques developing on the ends of the bar? If the shaft diameter is equal to 40 mm, what are the maximum stresses in two positions? Also determine the angle of twist where torque is applied.

Take E = 80 GPa.

Solution

E = 80 GPa = 0.8 × 1011 N/mm2

T = 3 kN-m

d = 40 mm = 0.04 m

J =  (π /32 )d 4 = (π /32)× (0.04)4  = 2.5 × 10- 7 m4

R = 40/2 = 20 mm = 0.02 m4

Z P        = J/ R = 1.26 × 10- 5 m3

910_Determine the angle of twist.png

Portion AC

T1 = torque

θ1 = (T1 l1 / GJ ) = 2T1 / G J

τmax      = (T1 /J ) R =  T1 / Z P

Portion CB

θ2 = T2  l2/ GJ  = 4T2 / GJ

tmax = (T2 /J ) R =  T2 / Z P

∴          T1  + T2  = 3

T2  = (3 - T1 )

θ1 = θ2                                          ---------- (1)

⇒         2T1/ GJ = 4T2/GJ

T2  = 2T2               -----------------(2)

 (1) and (2),

2T2  + T2  = 3

⇒ T2  = 1 kN-m --------- (3)

T1  = 2T2  = 2 × 1 = 2 kN-m     -------- (4)

Maximum Stresses

Portion AC

τmax = (2 × 103) / (1.26 × 10- 5) = 159 × 106 N/m2  = 159 N/mm2

 Portion CB

τmax = (1 × 103) / (1.26 × 10- 5)

 = 80 × 106 N/m2  = 80 N/mm2

 Angle of twist :

θ= 2T1 /GJ

=(2 × (2 × 103 )) / ((0.8 × 1011 ) (2.5 × 10- 7 )) = 2 × 10-1 radian = 0.2 radians


Related Discussions:- Determine the angle of twist - solid steel shaft

Performance criterion of a steam power plant, Performance criterion of a st...

Performance criterion of a steam power plant: Sol. :   The design of power plant can be determined largely by the consideration of capital cost and operating cost; the forme

Thermodaynamic, Ask question #MiThe steam that leaves the super-heater is e...

Ask question #MiThe steam that leaves the super-heater is expanded from 130bar at 535°C to 25.2bar at 310°C in a high pressure turbine. The steam from the exit of the HP turbine is

Calculate the maximum bending movement, A beam, 6 m long is simply supporte...

A beam, 6 m long is simply supported at the ends, and carries a uniformly distributed load of 15 KN/m and three loads of 10 KN, 20 KN and 30 KN acting respectively at the centre po

Determine the best possible angle to reduce aerodynamic drag, This is to de...

This is to determine the best possible angle to reduce aerodynamic drag. Mesh is to use tetrahedron of 0.5m wide.  I need the mesh generation and solver control on ansys 11.0. I al

Evaluate the stresses in the concrete and steel bars, A load of 1.9 MN is a...

A load of 1.9 MN is applied on a short concrete column 300mm x 300mm. The column is reinforced with four steel bars of 10mm diameter, one in each corner. Evaluate the stresses in t

Evaluate the magnitude, Evaluate the magnitude, direction and position of t...

Evaluate the magnitude, direction and position of the resultant of the system of forces (using vector method) shown in figure below.

Objectives of motorcycle repairing , Objectives: After studying this unit ...

Objectives: After studying this unit and subsequent practicing, you should be able to acquire the skills required for troubleshooting of a motorcycle and identify different

Analog control system for steam generator, Q. Analog Control System for ste...

Q. Analog Control System for steam generator ? The analog (modulating) control of the Steam Generators will be performed using a Process Control System (by Buyer). Detailed fun

Computer integrated manufacturing, methods involved in grouping the parts i...

methods involved in grouping the parts into families?

Theory of machines, What'' is balancing and vibration in machines Need of ...

What'' is balancing and vibration in machines Need of balancing? Causes of vibration and their harmful effects and remedies?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd