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制孔工艺对紧固孔疲劳性能的影响
引用本文:徐红炉,刘军,章刚,岳珠峰.制孔工艺对紧固孔疲劳性能的影响[J].飞机设计,2008,28(3):25-30.
作者姓名:徐红炉  刘军  章刚  岳珠峰
作者单位:西北工业大学,力学与土木建筑学院,陕西,西安,710072
基金项目:国家自然科学基金 , 国家高技术研究发展计划(863计划)
摘    要:分别在传统制孔工艺和Winslow制孔工艺下,对7050T7351铝合金材料的双犬骨连接件疲劳试验结果进行对比与可靠性分析;基于当量初始裂纹(EIFS)理论和符合性判据,计算不同制孔工艺下的原始疲劳质量;采用体视显微镜和扫描电镜对疲劳断口进行分析;对Winslow制孔工艺强化机理进行了定性的探讨。研究表明:改进工艺后,紧固孔的疲劳寿命均有所提高,分散性降低,疲劳强度增加;紧固孔的当量初始裂纹小于0.125mm,符合抗疲劳耐久性设计的要求;裂纹形核的位置不变,裂纹扩展区疲劳条带变窄。

关 键 词:Winslow制孔工艺  疲劳寿命  细节疲劳额定值  原始疲劳质量  疲劳断口

Effect of Drilling Processes on Fatigue Performance for Fasten Holes
XU Hong-lu,LIU Jun,ZHANG Gang,YUE Zhu-feng.Effect of Drilling Processes on Fatigue Performance for Fasten Holes[J].Aircraft Design,2008,28(3):25-30.
Authors:XU Hong-lu  LIU Jun  ZHANG Gang  YUE Zhu-feng
Institution:XU Hong-lu, LIU Jun, ZHANG Gang, YUE Zhu-feng ( Department of School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China)
Abstract:The fatigue experimental results of dog-bone mechanical joint for 7050T7351 aluminum alloy material are compared and the reliability analysis of fatigue life was carried out under the traditional and Winslow drilling processes in fastener holes.Based on the equivalent initial flaw size method and the coincidence criterion,the initial fatigue quality of two different drilling processes is calculated.Fatigue fractures are analyzed using stereomicroscope and scanning electron microscopy.The reasons that Winslow drilling process can improve the fatigue performance of fasten hole are discussed qualitatively.The results show that:With the Winslow drilling process,the fatigue life and the fatigue strength of fasten hole increases.At the same time the dispersibility decreases.Equivalent initial flaw size is smaller than 0.125 millimeter that can meet the requirement of coincidence criterion.The location of crack nucleation is unchanged and fatigue striations become narrow at the crack extended area.
Keywords:winslow drilling processes  fatigue life  detail fatigue rating  initial fatigue quality  fatigue fracture
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