1. Tensile strength:
When the material yields to a certain degree, the deformation resistance is improved again due to the rearrangement of the internal grains. At this time, although the deformation develops rapidly, it can only increase with the increase of the stress until the stress reaches a large value. After that, the material's ability to resist deformation was significantly reduced, and a large amount of plastic deformation occurred in the weak spots. Here, the cross-section of the test piece quickly reduced, and some necking phenomenon occurred until fracture and failure. The maximum stress value (corresponding value at point b) before tensile fracture of a material is called the strength limit or tensile strength
2. Yield strength:
When the stress exceeds the elastic limit, the deformation increases rapidly. At this time, in addition to the elastic deformation, part of the plastic deformation also occurs. When the stress reaches point B, the plastic strain increases sharply, and a small wave plateau appears on the curve. This phenomenon is called yield. The high and low zui stresses at this stage are called the upper yield point and the lower yield point, respectively. Because the value of the lower yield point is relatively stable, it is used as an index of material resistance, called the yield point or yield strength.
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