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影响弹簧疲劳强度六大因素
文章来源:http://www.sdzbthc.com/ 发布时间:2021-11-24 浏览次数:
.屈服强度材料的屈服强度和疲劳极限之间有一定的关系,一般来说,材料的屈服强度越高,疲劳强度也越高。
Yield strength there is a certain relationship between the yield strength and fatigue limit of materials. Generally speaking, the higher the yield strength of materials, the higher the fatigue strength.
.表面状态大应力多发生在弹簧材料的表层,所以弹簧的表面质量对疲劳强度的影响很大。
The surface state is large, and the stress mostly occurs on the surface of the spring material, so the surface quality of the spring has a great influence on the fatigue strength.
对材料表面进行磨削、强压、抛丸和滚压等。都可以提高弹簧的疲劳强度。
Carry out grinding, forced pressing, shot blasting and rolling on the material surface. Can improve the fatigue strength of the spring.
.尺寸效应材料的尺寸愈大,由于各种冷加工和热加工工艺所造成的缺陷可能性愈高,产生表面缺陷的可能性也越大,这些原因都会导致疲劳性能下降。因此在计算弹簧的疲劳强度时要考虑尺寸效应的影响。
The larger the size of the size effect material, the higher the possibility of defects caused by various cold working and hot working processes, and the greater the possibility of surface defects. These reasons will lead to the decline of fatigue performance. Therefore, the influence of size effect should be considered when calculating the fatigue strength of spring.
.冶金缺陷冶金缺陷是指材料中的非金属夹杂物、气泡、元素的偏析,等等。存在于表面的夹杂物是应力集中源,会导致夹杂物与基体界面之间过早地产生疲劳裂纹。采用真空冶炼、真空浇注等措施,可以大大提高钢材的质量。
Metallurgical defect metallurgical defect refers to non-metallic inclusions, bubbles, element segregation, etc. The inclusion on the surface is the source of stress concentration, which will lead to premature fatigue cracks between the inclusion and the matrix interface. The quality of steel can be greatly improved by adopting measures such as vacuum smelting and vacuum pouring.
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.腐蚀介质弹簧在腐蚀介质中工作时,由于表面产生点蚀或表面晶界被腐蚀而成为疲劳源,在变应力作用下就会逐步扩展而导致断裂。
When the spring of corrosive medium works in corrosive medium, it becomes a fatigue source due to pitting corrosion on the surface or corrosion of surface grain boundary, which will gradually expand under the action of variable stress and lead to fracture.
.温度碳钢的疲劳强度,从室温到120℃时下降,从120℃到350℃又上升,温度高于350℃以后又下降,在高温时没有疲劳极限。在高温条件下工作的弹簧要考虑采用耐热钢。在低于室温的条件下,钢的疲劳极限有所增加。
The fatigue strength of carbon steel decreases from room temperature to 120 ℃, increases from 120 ℃ to 350 ℃, and decreases after the temperature is higher than 350 ℃. There is no fatigue limit at high temperature. Heat resistant steel shall be considered for springs working under high temperature conditions. The fatigue limit of steel increases below room temperature.