Characterization of delaminations in composite laminates by laser ultrasonics

被引：2
|
作者：
Sun, Guangkai
Zhou, Zhenggan [1 ,2 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, NDT Grp, Beijing, Peoples R China
[2] Chinese Soc NDT, Shanghai, Peoples R China
来源：
MATERIALS TESTING | 2016年 / 58卷 / 10期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Aircraft; composite; delamination; laser ultrasonics; nondestructive characterization; SPHERICAL FUEL-ELEMENTS; GENERATED ULTRASOUND; ELASTIC-WAVES; INSPECTION; SYSTEM; MODEL;
D O I：
10.3139/120.110928
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The influence of delaminations in the anisotropic carbon fiber reinforced plastics (CFRP) on laser-generated ultrasound is investigated. A 3D-finite element method is used to simulate the propagation of ultrasonic waves in CFRP with delaminations. The asymmetric properties and distortions as well as the wave reflection and attenuation at delamination interfaces are clearly shown. Measurements on CFRP specimens with circular delaminations above 2 mm in diameter are imaged by C-scans and correlated to the modeling results. The effects of ultrasound frequency, defect size and depth location are discussed. The results show that it is possible to decrease the influence of anisotropy in CFRP composites by choosing appropriate ultrasonic frequencies and controlling the laser parameters.
引用
收藏
页码：877 / 886
页数：10
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