飞机结构发生多处损伤的概率分析方法  

PROBABILITY ANALYSIS METHOD FOR AIRCRAFT STRUCTURES CONTAINING MULTIPLE SITE DAMAGE

作　　者：闫晓中[1] 王生楠[1] 黄汉超[2] 

机构地区：[1]西北工业大学航空学院,西安710072 [2]陆军航空兵学院机械工程系,北京101114

出　　处：《机械强度》2012年第6期881-885,共5页Journal of Mechanical Strength

摘　　要：针对初始裂纹萌生和裂纹扩展的随机性,建立广布疲劳概率损伤模型。这个模型最主要的特征是通过蒙特卡洛法模拟初始裂纹萌生和裂纹扩展的随机过程,通过有限元对结构进行应力分析和给定的裂纹扩展公式确定裂纹的扩展增量计算。针对提出的方法,编程实现多裂纹随机萌生和扩展以及广布疲劳损伤(widespread fatigue damage,WFD)发生的过程。通过算例验证,该方法较真实模拟WFD的发生过程,为结构的WFD评估提供理论基础和有效的工程方法。In view of randomness of the crack initiation and crack propagation, a widespread fatigue probability damage model is established. The main feature of this model is, to simulate stochastic processes of the crack initiation and crack propagation through Monte Carlo method, and to determine the increment of crack propagation through stress analysis by finite element and using a given crack extension formula. According to the proposed method, the process of multi-crack random initiation and propagation and development of widespread fatigue damage （WFD） has been programmed. The feasibility of modeling process of WFD has been verified by a calculated example. This work provides theoretical basis and effective engineering method for the assessment of WFD.

关 键 词：初始裂纹 裂纹扩展 广布疲劳损伤 蒙特卡洛方法 

分 类 号：V215.6[航空宇航科学与技术—航空宇航推进理论与工程] V215.7