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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 commonly used.
The constitutive equations describe how the quantity in question responds to various stimuli via transport. Prominent examples include Fourier's law of heat conduction and the Navier–Stokes equations , which describe, respectively, the response of heat flux to temperature gradients and the relationship between fluid flux and the forces ...
Schematic diagram of Burgers material, Kelvin representation. Given that the Kelvin material has an elasticity and viscosity , the spring has an elasticity and the dashpot has a viscosity , the Burgers model has the constitutive equation
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In one dimension, the constitutive equation of the Herschel-Bulkley model after the yield stress has been reached can be written in the form: [3] [4] ˙ =, < = + ˙, where is the shear stress [Pa], the yield stress [Pa], the consistency index [Pa s], ˙ the shear rate [s], and the flow index [dimensionless].
From Wikipedia, the free encyclopedia. Redirect page. Redirect to: Constitutive equation
Although this type of fluid is non-Newtonian (i.e. non-linear) in nature, its constitutive equation is a generalised form of the Newtonian fluid. Generalised Newtonian fluids satisfy the following rheological equation: = (˙) ˙