Definition
The material is rigid for shear stress τ, less than a critical value . Once the critical shear stress (or "yield stress") is exceeded, the material flows in such a way that the shear rate, ∂u/∂y (as defined in the article on viscosity), is directly proportional to the amount by which the applied shear stress exceeds the yield stress:
Read more about this topic: Bingham Plastic
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