Value of the maximum shear stress , Mechanical Engineering

Value of the maximum shear stress:

Illustrates that for a given maximum shear stress the minimum diameter needed for a solid circular shaft to transmit P kW at N rpm may be expressed as

d = Constant × ( P/ N )3

What value of the maximum shear stress has been used if the constant equals 84.71, being in millimetre - N units?

Solution

 We know,

P × 103  = 2πNT /60 watts      

T =60 ×103/2πN

= (60 ×103 P /2πN )×1000 N mm

= 3 ×107 (P /πN )  N mm

2307_Value of the maximum shear stress.png

 T =  (π/16) d3 τm

d 3  = 16T /π τm

d 3  = (16T /π τm )× 3 × 107 ×   P = (48 × 107 / π2 τm  ). (P/ N)

∴ d = K ×(  P /N)(1/3)

where,

1324_Value of the maximum shear stress1.png

While   K = 84.71, we get,

84.71 = 368 / (τm )(1/ 3)

∴          (τm)(1/ 3)  = 368 /84.71 = 4.344

∴ τm = 82 N/mm2

Posted Date: 1/21/2013 2:49:57 AM | Location : United States







Related Discussions:- Value of the maximum shear stress , Assignment Help, Ask Question on Value of the maximum shear stress , Get Answer, Expert's Help, Value of the maximum shear stress Discussions

Write discussion on Value of the maximum shear stress
Your posts are moderated
Related Questions
Q. Show Pneumatic Test? Pneumatic testing presents hazards that must be addressed as part of the engineering design of the pressure vessel. Due to the additional hazards of

What are the advantages and disadvantages hard working over cold working

what are the functions of a lubricating system

With the help of neat diagram illustrate the working of supercritical steam Rankine cycle. Discuss its limitations. Diagram the flow graph of modern thermal power plant and show

Illustrate the following : a. Ash handling system b. Dust collection What are the impurities in the water and how they are replaced for use as feed water in modern thermal

Design the bending moment and shear force diagram for a simply supported beam of length 9 m and carrying a Uniformly distributed load of 10 KN /m for a distance of 6 m from the lef

Basic S.I. Units and its derived unit: S.I. stands for "System International Units". There are three quantities in the Standard International Systems as concerned to Mechanics

The Cu-Sb system contains 2 eutectics, 1 eutectoid, 1 peritectic and 1 peritectoid. Mark them all on the figure, write down the temperature and composition of each point, and ident

What is the aim of PDES The aim of PDES is to provide an interface which permits the exchange of data of the entire product development cycle and production cycle, see also PDE

Determine maximum shearing stress in shaft:   A propeller shaft 100 mm in the diameter, is 45 m long, transmits 10 MW at 80 rotation per minute. Determine maximum shearing str