一、前言长期以来,汽车工业就一直在利用喷丸这一工艺来改善板簧的疲劳性能。许多研究者认为,喷丸产生的残余应力在材料的疲劳过程中起着平均应力的作用,故与疲劳极限间存在线性关系。但是,文献[1][2]中所取的残余应力值是位于试样次表层的峰值,而次表层并不一定是疲劳裂纹的萌生处。实际上,工业用材由于有脱碳层和其他各种表面缺陷,裂纹往往 I. Foreword For a long time, the automotive industry has been using peening this process to improve the fatigue performance of leaf springs. Many researchers believe that the residual stress generated by shot peening plays a role of mean stress in the fatigue process of the material, so it has a linear relationship with the fatigue limit. However, the residual stress values ​​in [1] and [2] are the peaks located on the subsurface of the specimen, whereas the subsurface is not necessarily the site of fatigue cracks. In fact, industrial materials tend to crack because of decarburized layers and various other surface defects