Strength of the material in measured or determined by performing some experiments on the material. The strength of a material is the maximum load per unit area which it can bear/withstand.
When the tensile load is applied then the tensile strength of the material will resist the loading up to a limit and after that it will fail. The limit is known as the strength of that material.
Before getting failed the material gets deformed to certain degree and it depends on the Elastic properties of the material. There is a famous law i .e. Hooke's law, for the elastic materials, which helps us to determine the stress and strain in a material.
According to Hooke's law,
"Stress is directly proportional to strain, within elastic limits."
So if a material is stressed with an external load in its elastic range then the corresponding strain will follow this law.
Stress = Young's modulus of elasticity * Strain.
Young's modulus of elasticity is different for different materials and is same for all the elements formed of the same material.
Remember,
Stress = Applied Load/ Area of application
and Strain = Deformation/ original dimension.
So strain do not have any units, only stress do have the units and that is N/mm2.
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