Influence of attenuation on acoustic emission signals in carbon fiber reinforced polymer panels

被引：46
|
作者：
Asamene, Kassahun [1 ]
Hudson, Larry [2 ]
Sundaresan, Mannur [1 ]
机构：
[1] N Carolina Agr & Tech State Univ, Dept Mech Engn, Greensboro, NC 27411 USA
[2] NASA Armstrong Flight Res Ctr, Edwards AFB, CA 93523 USA
来源：
ULTRASONICS | 2015年 / 59卷
关键词：
Attenuation; Acoustic emission; Lamb waves; Carbon fiber reinforced polymers; Structural health monitoring; WAVE ATTENUATION; COMPOSITES; MATRIX; DELAMINATION; FAILURE;
D O I：
10.1016/j.ultras.2015.01.016
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
Influence of attenuation on acoustic emission (AE) signals in Carbon Fiber Reinforced Polymer (CFRP) crossply and quasi-isotropic panels is examined in this paper. Attenuation coefficients of the fundamental antisymmetric (A(0)) and symmetric (S-0) wave modes were determined experimentally along different directions for the two types of CFRP panels. In the frequency range from 100 kHz to 500 kHz, the A(0) mode undergoes significantly greater changes due to material related attenuation compared to the S-0 mode. Moderate to strong changes in the attenuation levels were noted with propagation directions. Such mode and frequency dependent attenuation introduces major changes in the characteristics of AE signals depending on the position of the AE sensor relative to the source. Results from finite element simulations of a microscopic damage event in the composite laminates are used to illustrate attenuation related changes in modal and frequency components of AE signals. Published by Elsevier B.V.
引用
收藏
页码：86 / 93
页数：8
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