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. Overview of Project Phases? Conceptual Engineering Phase The purpose of this phase of work is to develop the Client's proposal to a level of detail adequate to determin

Types Of Polymerisation When some of bifunctional molecules connect in a chain structure, the reaction is termed as addition polymerisation.  However, these polymerizations do

Evaluate the reactions at hinge and roller support: Q: A Force P = 5000N is applied at centre C of beam AB of length 5m as shown in figure given below. Find the reactio

Evaluate the power output of turbine: Q: A turbine in steam power plant operating under steady state conditions receives the superheated steam at 3MPa and 350ºC at the rate o

Determine the maximum value of the coefficient of friction: A force of 200 N inclined at 60 o to the horizontal is applied to the block A weighing 400 N. find out whether blo

Extension of auger in the main auger arrangement The original size of screw conveyer without auger extension is 2.5 m., which is same as size of chassis. Which to be attach wit

When and why the Multi-plate clutch is used ? Illustrate the working and constructional features of a multi-plates dry clutch. Describe clearly the necessity of a transmission s

(a) Compare otto, Diesel and Dual combustion cycle on the basis of compression ratio, same compression ration and same Heat input and constant maximum pressure and heat supplied.

Difference between path function and point function

derive the torsion formula as (torsion divided by radius) is equal to (modulus of rigidity multiplied by twist of angle all divided by the length of a cylinder)