We were discussing the concept of slope and deflection of beams, assumptions made in the Euler’s theory, Polar moment of inertia for various section in our previous posts.

Today we will start here with the concept of spring
index with the help of this post. Further, we will
derive the expression for stresses and also deflections developed in various
types of springs.

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**So, what is a spring?**

Spring is basically defined as the
elastic element which is basically used for absorbing the energy due to
resilience and this absorbed energy may be released as and when required. For
detailed post about the concepts and types of springs, we may find our recent
post i.e. spring in strength of material.

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**Spring index**

Spring index provides a relation between
mean diameter of spring and wire diameter of spring. Spring index is basically
defined as the ratio of mean diameter of spring to the wire diameter of spring.

We have used one word here related with
spring i.e. mean diameter of spring. Therefore, we must have to understand here
the mean diameter of spring.

Mean diameter of spring could be
determined by subtracting the wire diameter of spring from outer diameter of
spring.

When mean diameter of spring will be
divided by the wire diameter of spring, we will have the value of spring index.

Spring index value will be in the range
of 4 to 10.

Do you have suggestions? Please write in comment
box.

We will now see various terminologies of springs, in
the category of strength of material, in our next post.

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Reference:

Strength of material, By R. K. Bansal

Image Courtesy: Google