摘要
本文总结评述了断裂力学由二维理论到三维理论的发展历程.介绍了三维裂纹端部场的K-Tz和J-Tz双参数描述、K-T-Tz和J-QT-Tz三参数描述,以及三维弹塑性断裂准则和三维疲劳裂纹闭合模型等.通过具体的实例介绍了三维断裂理论在航空结构损伤容限分析中的应用.正确考虑离面约束和面内约束对裂纹端部场以及材料断裂和疲劳裂纹扩展性能的影响,能够发展航空结构损伤容限可预测设计能力.
The development history of fracture mechanics from two-dimensional theory to three-dimensional （3D） theory is reviewed in this paper. The two- and three-parameter descriptions of K-Tz, J- Tz, K-T-Tz and J-QT-Tz for 3D crack border field, as well as the 3D elastic and elastic-plastic fracture criterions and the 3D fatigue crack closure models are introduced. The applications of 3D fracture theory in damage tolerance analyses for aircraft structures are described in details for some practical cases. It is shown that the damage tolerance predictable design capability of aircraft structures can be achieved by correct consideration of the influences of out-of-plane and in-plane constraints on the crack border fields, fracture toughness and fatigue crack growth properties.
出处
《固体力学学报》
CAS
CSCD
北大核心
2010年第5期553-571,共19页
Chinese Journal of Solid Mechanics
关键词
三维断裂力学
裂纹端部场
三参数描述
断裂准则
疲劳裂纹闭合
航空结构
损伤容限
可预测设计
three-dimensional fracture mechanics, crack border fields, three-dimensional description, fracture criterions, fatigue crack closure, aircraft structures, damage tolerance, predictable design.
