裂纹尖端张开角在飞机金属薄壁结构中的应用  

CTOA Applications in Metallic Thin-walled Structures of Airplane

作　　者：鲁龙坤 庄茁[1] 柳占立[1] Lu Longkun;Zhuang Zhuo;Liu Zhanli(School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《航空科学技术》2020年第4期21-29,共9页Aeronautical Science & Technology

基　　金：清华大学“水木学者”计划(2019SM077)。

摘　　要：本文回顾了裂纹尖端张开角(Crack Tip Opening Angle,CTOA)在飞机金属薄壁结构中的应用。主要回答了"为什么CTOA是一个有效的断裂参数"和"CTOA怎样估算工程结构的断裂过程"这两个问题。韧性断裂的微观机理为空洞的形核、扩展及合并过程,断裂过程区(Fracture Process Zone,FPZ)包含了上述过程。CTOA实际上是FPZ的整体表征,因此CTOA是一个有效的断裂参数。此外,CTOA准则是一个局部断裂准则,它并不关心FPZ以外区域的状态,这使得它能够估算金属薄壁结构的裂纹扩展过程。The application of Crack Tip Opening Angle(CTOA)in metal thin-walled structures is reviewed in this paper.It answers"Why CTOA is a valid parameter"and"How to estimate fracture processes of engineering structures by CTOA".The micro mechanism of ductile fracture is the nucleation,growth and coalescence of void damage,which are included into the Fracture Process Zone(FPZ).CTOA is in fact a representative of the FPZ,and thus CTOA is a valid fracture parameter.In addition,since CTOA criterion is a local fracture criterion,the CTOA parameter doesn’t care what’s going on outside of FPZ.That is why this parameter can estimate the crack growth process in metallic thinwalled structures.

关 键 词：CTOA 断裂过程区 薄壁结构 局部断裂准则 韧性断裂 

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]