**Constitutive equation - Wikipedia**
https://en.wikipedia.org/wiki/Constitutive_equation

Mechanical properties of matter. The first constitutive equation (constitutive law) was developed by Robert Hooke and is known as Hooke's law. It deals with the case of linear elastic materials.Following this discovery, this type of equation, often called a "stress-strain relation" in this example, but also called a "constitutive assumption" or an "equation of state" was …

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