基于AE参数融合的NOL环损伤演化研究

doi:10.19936/j.cnki.2096-8000.20221128.004

复合材料科学与工程 ›› 2022, Vol. 0 ›› Issue (11): 28-34.DOI: 10.19936/j.cnki.2096-8000.20221128.004

基于AE参数融合的NOL环损伤演化研究

闫孝伟, 李伟^*, 蒋鹏, 刘颖红林, 程佳豪

东北石油大学机械科学与工程学院,大庆163318

收稿日期:2021-11-02 出版日期:2022-11-28 发布日期:2022-12-30
通讯作者: 李伟(1970-),男,博士,教授,主要从事复合材料损伤声发射特性方面的研究,liweidqpi@163.com。
作者简介:闫孝伟(1992-),男,硕士研究生,主要从事纤维增强复合材料损伤声发射特性方面的研究。
基金资助:
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)

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

YAN Xiao-wei, LI Wei^*, JIANG Peng, LIU Ying-hong-lin, CHENG Jia-hao

School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China

Received:2021-11-02 Online:2022-11-28 Published:2022-12-30

摘要/Abstract

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。

关键词: NOL环, b值, 界面损伤, 裂纹扩展

Abstract: 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.

Key words: NOL-ring, b value, interface damage, crack propagation

中图分类号:

TB332

闫孝伟, 李伟, 蒋鹏, 刘颖红林, 程佳豪. 基于AE参数融合的NOL环损伤演化研究[J]. 复合材料科学与工程, 2022, 0(11): 28-34.

YAN Xiao-wei, LI Wei, JIANG Peng, LIU Ying-hong-lin, CHENG Jia-hao. Study on damage evolution of NOL-ring based on AE parameters fusion[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(11): 28-34.

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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

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