基于AE参数融合的NOL环损伤演化研究  

Study on damage evolution of NOL-ring based on AE parameters fusion

作　　者：闫孝伟 李伟[1] 蒋鹏[1] 刘颖红林 程佳豪 YAN Xiao-wei;LI Wei;JIANG Peng;LIU Ying-hong-lin;CHENG Jia-hao(School of Mechanical Science and Engineering,Northeast Petroleum Lniversity,Daqing 163318,China)

机构地区：[1]东北石油大学机械科学与工程学院,大庆163318

出　　处：《复合材料科学与工程》2022年第11期28-34,共7页Composites Science and Engineering

基　　金：国家重点研发计划(2017YFC0805604);东北石油大学青年科学基金项目(2018QNL-32)。

摘　　要：为了实现声发射监测技术对NOL环损伤过程的评价,本文对NOL环进行静力拉伸和不同阶段的分级加载实验研究。通过实验对比,利用AE参数融合,引入R值和b值对NOL环损伤过程进行研究,将NOL环损伤分为三个阶段,并通过b值变化规律表征不同损伤情况。RA值和R值对试件早期损伤模式和累积损伤变化非常敏感。结果表明,分级加载实验第Ⅰ阶段的b值整体大于第Ⅱ阶段,且b值变大时R值呈现减小趋势,表明试件内部存在裂纹扩展。静力拉伸实验,第Ⅰ阶段损伤初始R值初始变化波动大且复杂;第Ⅲ阶段严重损伤,RA值变化大且复杂,超过0.85F_(max)时b值迅速降低,主要与界面损伤和纤维断裂有关,最终断裂的形成主要与引起损伤的主裂纹扩展有关。In order to evaluate the damage process of NOL-ring by acoustic emission monitoring technology, the static tension and graded loading experiments of NOL-ring in different stages are carried out in this paper. Through experimental comparison, using AE parameter fusion, R value and b value are introduced to study the NOL-ring damage process. The NOL-ring damage is divided into three stages, and different damage conditions are characterized by the change law of b value. RA value and R value are very sensitive to the early damage mode and cumulative damage change of the specimen. The results show that the b value in stage Ⅰ is larger than that in stage Ⅱ, and the R value decreases when the b value increases, indicating that there is crack propagation in the specimen. In the static tensile test, the initial R value of damage in stage Ⅰ fluctuates greatly and is complex. In stage Ⅲ of severe damage, RA value changes greatly and complex. When it exceeds 0.85F_(max), b value decreases rapidly, which is mainly related to interface damage and fiber fracture. The formation of final fracture is mainly related to the propagation of main crack causing damage.

关 键 词：NOL环 B值 界面损伤 裂纹扩展 

分 类 号：TB332[一般工业技术—材料科学与工程]