Find out the proof load in close coiled helical spring, Mechanical Engineering

Find out the proof load in close coiled helical spring:

A close coiled helical spring is built of 6 mm diameter wire. The coil diameter is equal to 80 mm, number of coil is 10. If the maximum stress in the spring is not to exceed 180 MPa, find out

1. the proof load,

2. the extension of spring.

Take G = 80 GPa.

Solution

Proof load is the load equivalent to maximum shearing stress in spring wire.

d = 6 mm, D = 80 mm, R = D/2 = 40 mm , n = 10, τmax = 180 N/mm2 , G = 80 GPa

Check

 d /2 D  = 6/ (2 × 180) = 0.0167

Therefore,       K = 1

 (a)       Proof load, W = τmax . π d 3 /16 R

= 180 × (π (6)3/ (16 × 40) = 191 N

 (b)       Extension, Δ= 64 W R3 n/ Gd 4

=64 × 191 × 403 × 10 / 80 × 103 × 64

= 75.5 mm

Posted Date: 1/21/2013 1:01:20 AM | Location : United States







Related Discussions:- Find out the proof load in close coiled helical spring, Assignment Help, Ask Question on Find out the proof load in close coiled helical spring, Get Answer, Expert's Help, Find out the proof load in close coiled helical spring Discussions

Write discussion on Find out the proof load in close coiled helical spring
Your posts are moderated
Related Questions
Draw a single point cutting tool and define its various parts. Also describe the standard anglesof this cutting tool.

Explain Degree of Freedom - Jig and Fixture The complete location of components inside a jig or fixtures can be understood with the help of figure. The work piece is a

Ask question #Minimum 1. Research the topic of heat loss in a cylindrical pipe. Explain which laws of physics are used to discuss heat loss in a pipe, and briefly explain how the f

A Mercedes-Benz 300SL (m = 1600 kg) is parked on a road that rises 20° above the horizontal. (a) What is the static frictional force that the ground exerts on the tires? (b) Wh

(a) What is value of drive chain slackness? (b) Write about cleaning procedure and adjustment of drive chain. (c) What is the wear of drive chain, sprocket and adjustment of

Calculate the force - pulley: A string is passing over a smooth pulley. The string supports the mass m on one side which is to be pulled up with acceleration a. calculate the

A frame PQRSTU is hinged to a rigid support at P and is simply supported at T. It is loaded as indicated in the figure below. Determine the magnitude and nature of the force in the

what do you understand by two like and unlike parallel forces?

EDM Machine under varying Cutting Condition a) All the experiments have been conducted on a Z numerically controlled (NC) oil die- sinking EDM Machine. b) The EDM Machine is

consider the following LPP max z=9x1+8x2+5x3 subject to 2x1+3x2+x3 5x1+4x2+3x3 x1,x2,x3>_0 (a)solve using simlex method (b)hence using the sesitivity analysis,find the new optima