That point, or intensity of stress, at which the rate of stretch begins to increase rapidly.

Can be defined as the point where a tensile test piece begins to extend permanently. If the load is reduced to zero, the test piece will not return to its original length.

Yield Point is the first stress in a material (less than the maximum attainable stress) at which an increase in strain occurs without an increase in stress. ASTM D1621

The load or stress at which a marked increase in the deformation of the sheet occurs without increasing the applied load. Yield point is one of the characteristics of low-carbon steels after they have been annealed. The yield point is usually calculated using a tensile-test specimen, and it is the load that is commensurate with the point beyond the elastic limit at which the specimen lengthens considerably without an additional increase in load.

The maximum stress that a given rock can withstand without becoming permanently deformed.

The point at which material will deform permanently during bending.

The maximum tensile stress which may be impressed upon a material without straining same beyond the elastic limit.

the point at which a plastic material will continue to elongate at no substantial increase in load during a short test period.

The maximum stress which a material is capable of sustaining without any measurable permanent extension remaining after complete release of the applied force.

The initial pressure required to cause a plastic material to flow.

The first stress in a material, usually less than the maximum attainable stress, at which an increase in strain occurs without an increase in stress. Only certain metals - those that exhibit a localized, heterogeneous type of transition from elastic deformation to plastic deformation - produce a yield point. If there is a decrease in stress after yielding, a distinction may be made between upper and lower yield points. The load at which a sudden drop in the flow curve occurs is called the upper yield point. The constant load shown on the flow curve is the lower yield point.

The point at which a material deforms with no increase in load; the stress at which a material ceases to deform in a fully elastic manner.

the stress at which a piece under strain yields markedly, becoming permanently distorted without increase of load.