弹簧种类很多,但一般地说,大部份弹簧都处于高应力反复长时间的作用之下,这是与其它机械零件所不一样的。弹簧设计上初始应力的选择与弹簧寿命有关的各项条件、制造上材料和热处理的选择,适当的表面加工等,都是重要的机械因素。 There are many types of springs, but in general most springs are under repeated high stress for a long time, which is different from other mechanical parts. The choice of initial stress in the design of the spring, as well as the conditions associated with the spring life, the choice of materials and heat treatments, the proper surface preparation, etc., are all important mechanical factors.