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
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

(a) What is the use of ball race drive? (b) How should one install the bottom cone race? (c) What is the use of front fork oil seal driver body and its attachment? (d) Wha

T w o Stroke and Four Stroke Engines: In  the two stroke engines thermodynamic cycle is completed in One revolution of crank shaft whereas in 4 stroke engines the cycle is c

Example of Process Capability The specifications for one characteristic of a part call for its width to be 3.000 + 0.008 centimetres. The procedure has been run under controll

Give a neat and clean diagram of Heavy water type "CANDU" nuclear power plant and illustrate its working. The incremental fuel costs for two generating units ‘a and b' of a powe


Reversible and irreversible processes: Thermodynamic system which is capable of restoring the original state of it by reversing the factors responsible for occurrence of proc

hiw can i fix the maximum temp of the aluminium

Draw bending moment diagram for the beam: A cantilever beam carries a uniformly distributed load of 2 t/m over the total length of 6 m and point loads of 5 t, 3 t, 7 t & 2 t a

Question: As shown in the figure, the jet transport B is flying north with a velocity V B = 600 Km/h when a smaller aircraft A passes underneath the transport headed in the 60