一、引言 强力旋压产品由于加工过程中金属变形的不均匀,因而产生不均匀的残余应力分布。残余应力的存在必然对产品的性能产生影响。在实际产品中总难免存在一些缺陷(如裂纹、夹杂,折迭等)。这些存在于产品表层或内部的缺陷,在一定的外部条件下就会产生失稳扩展,最后导致低应力脆断。 I. INTRODUCTION Strong spinning products due to the processing of metal deformation is not uniform, resulting in uneven distribution of residual stress. The existence of residual stress inevitably affects the performance of the product. There are always some defects in the actual product (such as cracks, inclusions, folds, etc.). These defects, which exist on the surface or in the interior of the product, result in instability expansion under certain external conditions and finally low stress brittle fracture.