【摘要】 广布疲劳损伤(WFD)是老龄飞机结构中存在的一种损伤,直接影响到飞机的安全性和可靠性。它的特征是飞机的多个部位存在疲劳裂纹损伤或构件上同时存在多个疲劳裂纹损伤。这些裂纹一旦发生聚合和连通,结构剩余强度就会急剧降低,从而发生灾难性的事故。由于WFD的复杂性,很难采用传统的单裂纹线弹性断裂力学理论进行分析和研究。在WFD的建模、应力强度因子的求解、疲劳寿命的评估等方面,介绍了老龄飞机广布疲劳损伤的研究现状和基本方法,并提出了一些当前需要解决的问题。更多还原

【Abstract】 Widespread Fatigue Damage is a common phenomenon of aging aircrafts,which has a negative impact on safety and reliability of the aircrafts. It is characterized by the simultaneous presence of cracks at multiple structural components. When cracks coalesce,it dramatically reduces the remaining strength of mechanical structures,making a catastrophe most likely to happen. Due to the complexity of the WFD,it is very difficult to analyze and do research in application of the theory of the traditional single-crack-based elastic dynamics,for an establishment of WFD patterns,and for a solution to dynamic strength elements,as well as in an appraisal aimed at defining the fatigue life,the article introduces the current research condition of,and research method for,aged aircrafts.更多还原