Definition of yield stress in English English dictionary
A critical value of shear stress, below which a plastic or viscoplastic material behaves like a solid; above this value, a plastic material deforms and a viscoplastic material flows
when a steel exhibits the first measurable permanent plastic deformation Young's Modulus is the slope of the elastic portion of the stress strain curve in the region of linear elastic behaviour (symbolized by E)
The stress at which the strain ceases to be directly proportional to the stress The stress by which steel is identified such as A-36 indicated 36,000 psi yield
(Yield Point) the minimum load required to permanently deform a plastic material
(or Yield Strength): Engineering Stress required to produce a small specified amount of plastic deformation The usual definition of this property is the "offset yield strength" determined by the stress corresponding to the intersection of the stress-strain curve and a line parallel to the elastic part of the curve offset by a specified strain, typically 0 2% API5L presently specifies instead a total strain of 0 5%, corresponding to the point on the stress-strain curve with an elongation of 0 5%
For some fluids, the shear rate (flow) remains at zero until a threshold shear stress is reached, termed the yield stress Beyond the yield stress flow begins For additional definitions and explanations, more complete dictionaries are available See