非共面双裂纹扩展相互作用的试验及模拟  

Test and simulation of interaction of non-coplanar double surface cracks

作　　者：陈跃良[1] 胡建军[2] 卞贵学[2] 刘旭[1] 赵晨[2] 

机构地区：[1]海军航空工程学院青岛分院,青岛266041 [2]海军航空工程学院研究生管理大队,烟台264001

出　　处：《应用力学学报》2012年第5期585-588,631,共4页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50675221;51075394);总装十一五预研(51327030104)

摘　　要：对非共面双裂纹进行了疲劳试验,分析认为其裂纹扩展属于三型复合型裂纹;建立了双裂纹结构有限元模型,通过计算裂纹前端应力强度因子并结合复合型裂纹的扩展特性及断裂准则,对裂纹相对尺寸、相对位置对其扩展的影响以进行了研究。结果表明:当偏移距离与较长裂纹尺寸的比值大于较短裂纹尺寸与较长裂纹尺寸的比值时,裂纹间相互作用较小,对疲劳寿命几乎没有影响;反之裂纹间相互作用较大,将会减少疲劳寿命。The non-coplanar double cracks are analyzed by fatigue test.They are considered as mixed mode cracks of three typical cracks.The finite element model of non-coplanar double cracks is established and the crack tip stress intensity factors(SIFs) are calculated.Then the effect of relative size and relative position of cracks on crack propagation is investigated based on the crack growth characterization and fracture criterion.The results obtained show that if the ratio of the offset distance and the longer crack size is greater than the ratio of the long crack size and shorter crack size,the interaction of two cracks have no effect on the fatigue life,conversely,the interaction will reduce fatigue life.

关 键 词：双裂纹 非共面 有限元分析 相互作用 

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]