According to the classical theory of elasticity, stress and strain are uniquely related. However, as early as 1825 small deviations from perfect elasticity were observed in galvanometer suspensions. Upon release of the couple the suspension did not at once return to its zero point but approached the zero asymptotically. This behaviour, which was termed the elastic after-effect, is one of several effects, caused by the lack of uniqueness between stress and strain in the preplastic range generally known as anelasticity.
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Burdett et al. (1970) studied this question.
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