What is meant by yield strain?

The stress level where the material starts to strain plastically is termed the yield stress, σy. When a material is stressed by an amount that is less than the materials yield stress it will only undergo elastic (reversible) strain, and no permanent deformation of the material will occur.

What is the purpose of the defining the yield stress?

Yield stress, marking the transition from elastic to plastic behaviour, is the minimum stress at which a solid will undergo permanent deformation or plastic flow without a significant increase in the load or external force.

What does a high yield strain mean?

A metal that has a high yield strength can withstand high stress without permanent deformation. The yield strength of a bar of material is the maximum stress that can be applied along its axis before it begins to change shape.

What is yield of a material?

Yield of a material is explained as the stress at which a material begins to deform irreversibly. Preceding the yield point, the material will deform elastically, meaning that it will return to its original shape when the applied stress is removed (i.e. no permanent, visible change in the shape of the material).

What is yield point in drilling mud?

Yield Point (YP) is resistance of initial flow of fluid or the stress required in order to move the fluid. It can be simply stated that the Yield Point (YP) is the attractive force among colloidal particles in drilling fluid. As per Bingham plastic model, YP is the shear stress extrapolated to a shear rate of zero.

What is the meaning of yield in metal?

yield strength in Mechanical Engineering The yield strength of a bar of material is the maximum stress that can be applied along its axis before it begins to change shape. Steel yield strength is the amount of stress a piece of steel must undergo in order to permanently deform.