Introduction
The use of Poisson’s Ratio can be applied to measure the axial longitude and latitude of
a material.
This can be used in many situations that require safety factors to obtain a
successful product in the field and in industrial practices.
The system is used to
translate strains of the experiment into stresses. The experiment teaches you the basic
fundamentals of Longitudinal and Lateral stresses that occur in different materials.
Purpose
The purpose of this experiment is to measure Poisson’s Ratio of an aluminum beam by
loading the beam in cantilever bending. Poisson’s Ratio is described as an elastic
constant related to stress and strain in a biaxial stress field. This equation is used to
show the correction for transverse sensitivity.
Theory
Hooke’s Law for biaxial stress shows the relationship between the elastic modulus and
Poisson’s Ratio to translate measured strains into stresses.
δ
= E/1v² (
ᵪ
ε
+ v
ᵪ
ε
)
ᵧ
where:
δ
= stress, psi (N/m²)
ε
= strain, in/in (m/m)
δ
= E/1v² (
ᵧ
ε
+ v
ᵧ
ε
)
ᵪ
v= Poisson’s Ratio (dimensionless)
E= modulus of elasticity, psi (N/m²)
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 Spring '11
 SMITH
 POISSON’S RATIO

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