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一、引言 由于冶金的以及工艺的原因,材料中可能存在某些缺陷;航空产品在环境或反复加载工作条件下的应力集中处也会产生裂纹。考虑到高强度材料的特性,对于可能含有裂纹的高强度材料的疲劳断裂特性的研究是很重要的。而疲劳载荷下的亚临界裂纹扩展特性,不仅为合理选材而且也为预计构件剩余寿命、确定构件检修周期提供所需的数据。
I. INTRODUCTION Due to metallurgical and technological reasons, some defects may exist in the materials. Cracks may also occur in the stress concentration areas of aviation products under the environmental or repeated loading working conditions. Considering the properties of high-strength materials, it is important to study the fatigue fracture behavior of high-strength materials that may contain cracks. The subcritical crack propagation under fatigue loading not only provides a reasonable material selection but also provides the necessary data to predict the remaining life of the component and determine the component overhaul period.