Stress Measurement of Orthogonal Fiber-Reinforced Composites under Biaxial Stress Conditions Based on Critically Refracted Longitudinal Wave Method

IF 1.2 4区 物理与天体物理 Q4 ACOUSTICS
Li Yicen, Li Rongguang, Sun Ling, Chen Sixun, Cheng Zhiqiang
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引用次数: 0

Abstract

This study derives the relationship between ultrasonic velocity and stress in orthogonal fiber-reinforced composites under biaxial stress conditions. By calibrating the stress coefficients in two directions, the stress values in the composite plate can be obtained using two time-of-flight measurements. The calibration of stress coefficients requires determining the first critical incident angle. Thus, micromechanics methods were used to calculate the stiffness matrix of the composite material, which was then input into a finite element model to simulate the ultrasonic velocity in the orthogonal composite material. This process determined the incident angle capable of exciting the critical refracted longitudinal wave, namely the first critical incident angle. Rectangular specimens of orthogonal composites were manufactured from glass fiber-reinforced composite plates with bidirectional layup, and uniaxial tensile tests were conducted to verify the accuracy of the first critical incident angle and to calibrate the stress coefficients. It was found that the normal stress in the fiber direction results in a decrease in the ultrasonic velocity in both the fiber and perpendicular directions. To verify the accuracy of ultrasonic stress measurement, uniaxial tensile specimens with a central hexagonal area under biaxial stress conditions and standard biaxial tensile specimens were specially designed. The experimental results for both specimens showed that the ultrasonic stress measurement results were in good agreement with the stress measured using strain gauges, confirming the accuracy and practicality of the ultrasonic stress measurement method.

Abstract Image

Abstract Image

基于临界折射纵波法的正交纤维增强复合材料双轴应力测量
研究了双轴应力条件下正交纤维增强复合材料中超声声速与应力的关系。通过在两个方向上标定应力系数,可以利用两次飞行时间测量得到复合板内的应力值。应力系数的标定需要确定第一临界入射角。因此,采用细观力学方法计算复合材料的刚度矩阵,然后将其输入有限元模型,模拟正交复合材料中的超声速度。这一过程确定了能够激发临界折射纵波的入射角,即第一临界入射角。采用双向铺层的玻璃纤维增强复合材料板制作正交复合材料矩形试样,进行单轴拉伸试验,验证第一临界入射角的准确性,并标定应力系数。结果表明,纤维方向上的法向应力使纤维方向和垂直方向上的超声速度减小。为了验证超声应力测量的准确性,专门设计了双轴应力条件下具有中心六角形区域的单轴拉伸试样和标准双轴拉伸试样。两种试样的实验结果表明,超声应力测量结果与应变片测得的应力吻合较好,证实了超声应力测量方法的准确性和实用性。
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来源期刊
Acoustical Physics
Acoustical Physics 物理-声学
CiteScore
1.60
自引率
50.00%
发文量
58
审稿时长
3.5 months
期刊介绍: Acoustical Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It covers theoretical and experimental aspects of basic and applied acoustics: classical problems of linear acoustics and wave theory; nonlinear acoustics; physical acoustics; ocean acoustics and hydroacoustics; atmospheric and aeroacoustics; acoustics of structurally inhomogeneous solids; geological acoustics; acoustical ecology, noise and vibration; chamber acoustics, musical acoustics; acoustic signals processing, computer simulations; acoustics of living systems, biomedical acoustics; physical principles of engineering acoustics. The journal publishes critical reviews, original articles, short communications, and letters to the editor. It covers theoretical and experimental aspects of basic and applied acoustics. The journal welcomes manuscripts from all countries in the English or Russian language.
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