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Several Factors Influencing Spring Fatigue Strength
Mar 20, 2018

 

1.       There is a certain relationship between the yield strength and the fatigue limit of the yield strength material. In general, the higher the yield strength of the material, the higher the fatigue strength. Therefore, in order to improve the fatigue strength of the spring, the yield of the spring material should be improved. Strength, or a material with a high ratio of yield strength and tensile strength. For the same material, the fine-grained structure has a higher yield strength than the coarse-grained structure.copper electroplate custom cnc machining part OEM&ODM


2.       The maximum stress in the surface state occurs mostly in the surface layer of the spring material, so the surface quality of the spring has a great influence on the fatigue strength. The defects such as cracks, flaws and flaws caused by the spring material during rolling, drawing and rolling are often the cause of spring fatigue fracture.

The maximum stress in the surface state occurs mostly in the surface layer of the spring material, so the surface quality of the spring has a great influence on the fatigue strength. The defects such as cracks, flaws and flaws caused by the spring material during rolling, drawing and rolling are often the cause of spring fatigue fracture.

The maximum stress in the surface state mostly occurs on the surface of the spring material, so the surface quality of the spring has a great influence on the fatigue strength. The defects such as cracks, flaws and flaws caused by the spring material during rolling, drawing and rolling are often the cause of spring fatigue fracture. The smaller the surface roughness of the material, the smaller the stress concentration and the higher the fatigue strength. The effect of the surface roughness of the material on the fatigue limit. The fatigue limit decreases with the increase of surface roughness. copper electroplate CNC milling part OEM&ODM. Under the same roughness condition, the fatigue limits of different steel grades and different rolling methods are also different. For example, the degree of reduction of cold coil springs is smaller than that of thermal coil springs. Because the steel coil spring and its heat treatment, due to oxidation of the spring material surface rough and decarburization phenomenon, thus reducing the fatigue strength of the spring.

For grinding, pressing, blasting and rolling on the surface of the material. The fatigue strength of the spring can be improved.

3. The larger the size of the size effect material is, the higher the possibility of defects caused by cold processing and hot working technology is, the more likely it is to produce surface defects, which will lead to the decrease of fatigue performance. Therefore, the effect of the size effect should be considered in calculating the fatigue strength of the spring。

4. Metallurgical defect metallurgical defects refer to the segregation of non-metallic inclusions, bubbles, elements in the material, and so on. The inclusion on the surface is the stress concentration source, which leads to premature fatigue cracks between the inclusions and the matrix interface. The quality of steel can be greatly improved by means of vacuum smelting and vacuum pouring.CNC turning copper electroplate part OEM&ODM

5. When corrosive medium spring is working in corrosive medium, it will become a fatigue source due to pitting on the surface or corrosion on the surface grain boundary. It will expand gradually and cause fracture under the action of stress. For example, the fatigue limit of spring steel working in fresh water is only 10%~25% in the air. The effect of corrosion on the fatigue strength of the spring is not only related to the number of variable loads on the spring, but also on the working life. So when designing and calculating the spring that is affected by corrosion, the working life should be taken into account.

In order to ensure its fatigue strength, high strength corrosion resistant materials, such as stainless steel, non-ferrous metal, or protective coating on the surface, such as coating, oxidation, spray painting and painting, can be used to ensure fatigue strength. The practice shows that cadmium plating can greatly increase the fatigue limit of the spring

6. The fatigue strength of temperature carbon steel decreased from room temperature to 120 degrees, and increased from 120 to 350 degrees. The temperature decreased after 350 degrees Celsius, and there was no fatigue limit at high temperature. Heat resistant steel should be considered in the spring working under high temperature. The fatigue limit of steel is increased at less than room temperature.Hardware copper electroplate product OEM&ODM


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    Tel: +86-755-27359623
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