Bingham plastic
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A Bingham plastic is a viscoelastic material that behaves as a rigid body at low stresses but flows as a viscous fluid at high stress. It is used as a common mathematical model of mud flow in offshore engineering, and in the handling of slurries.
The material is rigid for shear stress τ, less than a critical value τ0. Once the critical shear stress (or "yield stress") is exceeded, the material flows as a Newtonian fluid with incremental shear stress and shear rate, ∂u/∂y, (as defined in the article on viscosity) related by:
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