The difference between yield strength and breaking strength


The difference between yield strength and breaking strength


Yield strength and breaking strength are important indicators for testing related geotechnical materials.


Many practitioners are very vague about the concepts of these two parameters, or even do not understand them. It's just that the customer will quote a price based on the standard.


But in many cases, the indicators requested by customers are not completely in accordance with national standards, but only require the main technical parameters such as breaking strength and breaking elongation.


At this time, if you don't understand this parameter. Rarely, failing to comply with customer requirements, causing unnecessary trouble. In many cases, the standard production is higher and the profit is reduced. Today we will talk about these two parameters.


To talk about these two concepts, start with how the material is destroyed. Any material will eventually exceed a certain limit and be destroyed under the external force that is constantly increasing or constantly constant or continuously changing. There are many types of external forces that can damage materials, such as tension, pressure, shear, and torsion. The two strengths of yield strength and tensile strength are only for tensile strength. These two strengths are obtained through tensile testing, through a tensile testing machine (usually a universal testing machine, which can perform various tension, compression and bending tests), using a prescribed constant loading rate (that is, unit time The increase in internal tension), the material is continuously stretched until it breaks or reaches the specified degree of damage (for example, some butt weld strength tests may not be broken). This force that causes the final failure of the material is the material's tensile strength Ultimate load.


When we start to pressurize, the material will enter the elastic stage. The characteristics of this stage are: no matter how much the force is applied, the material will not deform much, and the material will rebound after being loosened. Then the material enters the yield stage. The characteristic of the yield stage is that the material will still have a certain deformation without applying force. Then the minimum stress that can cause the yield phenomenon is called the yield point or yield stress. The ultimate force at this time is the yield strength.


After the yield point, the material enters the plastic stage. The characteristic of this stage is that the force increases and the material deforms larger, that is, the elastic modulus of the material decreases. (commonly known as the material bows or yields) At this stage, you unload the force When the material is broken, the material will undergo permanent deformation; the final stage of fracture, at this time, the maximum stress of the material before the fracture is the tensile strength of the material. That is to say the breaking strength.

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