Sheet Pile Wall Design and Construction: A Practical Guide for Civil Engineer...
Mechanics of Solid
1. DHAKA UNIVERSITY OF ENGINEERING &TECHNOLOGY, GAZIPUR-1707
PRESENTATION ON
HELICAL SPRING
SUBJECT: MECHANICS OF SOLIDS-2 (SESSIONAL)
SUBJECT CODE: CE-2104
2. PRESENTED BY
GROUP NO-03
PRESENTED TO
Dr.Md.Abdus Salam
Professor
Depertment Of Civil Engineering
Mr.Shahab Uddin
Lecture
Depertment Of Civil Engineering
STUDENT ID : 161090
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4. CONTENTS TO BE DISCUSSED
01.BACKGROUND
02.INTRODUCTION
03.OBJECTIVES
04.APPARATUS AND MATERIALS
05.FUNCTION OF HELICAL SPRING
06.CLASSIFICATION OF HELICAL SPRING
07.NOMENCLATURE OF HELICAL SPRING
08.DATA SHEET AND GRAPH
09..RESULT AND CALCULATION
10.DISCUSSION AND RECOMMENDATION
11.REFERENCE
5. The First Coiled Spring
It wasn’t until 1763 when R. Tradwell invented the first ever coiled spring. It was a Brittish patent, number
792. It was considered a step up from the leaf spring. The leaf spring had to be lubricated often and was
quite squeaking. The best was that the spring didn’t have to be spread apart.
The word coil meant to wind cylindrically or spirally. In the year 1857 the first ever steel coil spring was
invented. It was used for chair seats.
Ever since the inventions of these coil springs, springs have been used in everything from shoes to
trampolines. Springs help make the car industry what it is today. Springs are used in every type of
machinery and they really do help make the world go around.
In these type of springs the major stresses is torsional shear stress due
to twisting. They are both used in tension and compression. (ii) Spiral
springs: They are made of flat strip of metal wound in the form of
spiral and loaded in torsion. In this the major stresses are tensile
and compression due to bending.
BACKGROUND
6. INTRODUCTION
Helical spring is a device is used to store some energy,so
that when the energy is needed,it is relesed
They can return their original shape when the force is
released
It is defined as elastic bodies
7. OBJECTIVES
The overall objectives was to investigate the modulus of rigidity,deflection and
maximum shear stress, flexibility of helical spring.
Some specific objectives are:
01.To observe the load deflection relationship of the helical spring.
02.To determine some it’s physical properties.
03.To find the stiffness of the spring.
04.To compare the theortical stiffness with the observed value.
04.To draw a curve by ploting load against deflection and find the modulus of rigidity of
the spring materials
16. RESULTS
Maximum shear stress=87.55 Mpa
Maximum strain =63.14 mm/mm
Direct shear stress=7.92 Mpa
Torsional shear stress=80.34 Mpa
Deflection=14.33 mm
Stiffness=348.83 N/mm
Modulus of reslience=35.825 joule
17. Conclusion
Spring is made of an elastic materials that changes in
shape or deform when a force is applied to it
There are a number of other spring shapes used in
engineering field
18. DISCUSSION
The curve load vs deflection shows that under loading faces increases the deflection also increases.At the load
also increases 5000 N the maximum deflection occur That is the value of 15.47 mm.so the deflection is linear .
RECOMMENDATION
The helical spring is very strong in compressive force.In civil engineering it is used in the bridge where impulse load
rapidly up and down so it is very helpful to resist the impulse load.
