Tensile Strength

There are three definitions of tensile strength:

Yield Strength:  The stress at which material strain changes from elastic deformation to plastic deformation, causing it to deform permanently

Ultimate Strength:  The maximum stress a material can withstand when subjected to tension, compression or shearing. It is the maximum stress on the stress-strain curve  

Breaking Strength: The stress coordinate on the stress-strain curve at the point of rupture

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