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In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain.It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing).
In continuum mechanics, stress is a physical quantity that describes forces present during deformation.For example, an object being pulled apart, such as a stretched elastic band, is subject to tensile stress and may undergo elongation.