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

doi:10.19936/j.cnki.2096-8000.20221128.004

Abstract

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

CLC Number:

TB332

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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