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The zone of yield strength and tensile strength of material in tensile testing machine

Source: Tensile testing machine October 17, 2018 Keywords: Tensile testing machine testing machine    

    1、 Tensile testing machine Tensile strength of test material
After the steel yield to a certain extent, because of the internal grain rearrangement, the resistance to deformation will be improved. Although the development of deformation is very fast at this time, it can only increase with the increase of stress until the stress reaches the maximum value. Then, the steel's ability to resist deformation will be obvious, and at the same time, a relatively large plastic deformation will occur at the weakest point, where the cross-section of the specimen will rapidly shrink and necking phenomenon will appear, and then until the fracture failure. The maximum stress value of the steel before it breaks in tension is called the strength limit or tensile strength.
2. Yield strength of test materials
In the tension test, after the stress exceeds the elastic limit, the deformation will increase faster. At this time, in addition to the elastic deformation, a part of the plastic deformation is also produced. After the stress reaches point B, the plasticity increases rapidly, and there will be a small fluctuation platform in the curve. This phenomenon is called yield. The minimum and maximum stresses in this stage are called lower yield point and upper yield point respectively. The yield point, or yield point, is called the yield point of the material.

 

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