疲劳裂纹闭合的非线性超声在线测量  

On-line fatigue crack closure determination using nonlinear ultrasound testing

作　　者：贾俊[1] 陶利民 胡海峰[1] 胡永攀 吕伟[1] JIA Jun;TAO Limin;HU Haifeng;HU Yongpan;LYU Wei(Science and Technology on Integrated Logistics Support Laboratory,College of Artificial Intelligence, National University of Defense Technology,Changsha 410073,China;College of Mechanical and Marine Engineering,Qinzhou University,Qinzhou 535011,China;National Engineering Research Center for Disaster and Emergency Rescue Equipment,Logistical Engineering University,Chongqing 401331,China)

机构地区：[1]国防科技大学智能科学学院装备综合保障技术重点实验室,湖南长沙410073 [2]钦州学院机械与船舶海洋工程学院,广西钦州535011 [3]后勤工程学院国家救灾应急装备工程技术研究中心,重庆401331

出　　处：《国防科技大学学报》2018年第5期97-102,共6页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(51305449)

摘　　要：建立了外部载荷作用下用非线性振动-声场调制指数表征裂纹尺寸的数学模型。根据对外载荷与塑性致闭应力共同作用下裂纹面的开闭响应的分析,提出了裂纹张开和闭合应力的在线测量方法。在一块含中心穿透裂纹的铝合金薄板试件上进行了裂纹闭合参数的测量实验,实验结果表明,使用振动-声场调制技术在线测量裂纹闭合参数是可行且有效的,且该方法还能用于分析小裂纹的特殊开闭行为。A mathematical model which displays the relation between the vibro-acoustic modulation index and the crack contact area was developed.Based on the analysis of crack faces response to the resultant of applied load and plasticity induced crack closure stress,a procedure of on-line approximating the opening and closure stress was proposed.To study the performance of this measuring method experimentally,the on-line vibro-acoustic modulation tests were carried out on a central cracked aluminum alloy fatigue sample.Analysis of the experimental results suggests that the vibro-acoustic modulation technology is not only capable of measuring the fatigue crack opening and closure stresses,but also capable of analyzing the crack closure behavior,even for physically short cracks.

关 键 词：裂纹闭合 张开应力 振动-声场调制 结构健康监测 非线性超声检测 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]