We were
discussing the concept of stress and strain and also we have discussed the
different types of stress and also different types of strain in our previous
posts. We have also seen the concept of Hook’s Law and types of modulus of elasticity
in our recent post.
Now we are going further to start our discussion to understand the “Concept of Poisson ratio”, in subject of strength of material, with the help of this post.
Now we are going further to start our discussion to understand the “Concept of Poisson ratio”, in subject of strength of material, with the help of this post.
Let us see here the concept of Poisson ratio
In early
1800s, french scientist provided one concept and according to his concept
“If a
material will be loaded within elastic limit, ratio of lateral strain and
linear strain or axial strain will be constant and this ratio will be termed as
Poisson ratio”.
We denote
Poisson ratio by Nu (ν)
In simple,
we can say that
Poisson ratio (ν) = Lateral strain/ Linear strain
we can also say that, Lateral strain = Poisson ratio (ν) x Linear strain
As we have already seen that , lateral strain will be opposite in sign to linear strain and therefore above equation will be written as following
As we have already seen that , lateral strain will be opposite in sign to linear strain and therefore above equation will be written as following
Lateral strain = - Poisson ratio (ν) x Linear strain
Let us consider the following figure, one cylinder with initial length l0 and initial diameter d0 is loaded with tensile force F as displayed here in following figure. Let cylinder is loaded within elastic limit.As we can see here that load is of tensile type and therefore there will be increment in length and decrement of diameter of the cylinder.
Let final
diameter and length of the cylinder are d and l respectively, as shown in
figure, when cylinder is loaded within elastic limit.
Value of Poisson ratio will be in between 0.1 to 0.5 i.e. less than one and hence we can say that when a material will be loaded within elastic limit, lateral strain will be less than the linear strain or axial strain.
Do you
have any suggestions? Please write in comment box
Reference:
Strength of material, By R. K. Bansal
Image Courtesy: Google
We will see another important topic the category of strength of material.
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