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Definition of Proportional limit

Proportional limit Definition from Science & Technology Dictionaries & Glossaries
Oil and Gas Field Glossary
The greatest stress a material is capable of sustaining without a deviation from the law of proportionality of stress and strain. If the load is removed for any stress up to this point, the material will assume its original dimension.
Proportional limit Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A yield strength or yield point of a material is defined in engineering and materials science as the stress at which a material begins to deform plastically. Prior to the yield point the material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible.
In the three-dimensional space of the principal stresses (), an infinite number of yield points form together a yield surface.

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