ing machine is widely applied in all kinds of metal, metal, rubber, plastics, footwear, leather, clothing, textile, insulation, wire, cable, terminal and other kinds of material, testing the tensile, tear, peel, compressive strength, bending the material such as research and development, test, the function of its complete, use extensively.
But people often put the tensile strength and yield strength of tensile testing machine for confusing.
Tony instruments below small make up is to introduce the tensile testing machine under the difference between the tensile strength and yield strength in: a, tensile strength, after the steel yield to a certain extent, because of the internal grain rearrangement, renewed the ability to resist deformation, deformation while developing rapidly at this time, but it is only with the increase of stress, until should put maximum.
Since then, the steel significantly lower resistance to deformation ability, and large plastic deformation in the weakest place, the specimen cross section shrinking rapidly, appear necking phenomenon, until the fracture failure.
Steel tensile fracture before the maximum stress value is called the ultimate strength or tensile strength.
B, yield strength, elastic limit, when the stress exceeds the deformation increase faster, at this time in addition to produce elastic deformation, also produce some plastic deformation.
When stress after reaching point B, plastic should be a sharp increase in curve shows a small fluctuation of platform, this phenomenon is called the yield.
This stage of the largest and the most little stress which is called the yield point and the lower yield point.
Due to the lower yield point value is relatively stable, so to it as material resistance index, known as the yield point or yield strength.
Note: stress exceeds limit curve steep decline after the drop point is the yield point.
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