用激光光声法定量分析碳纤维结构中局部孔隙率的分布

Yu. G. Sokolovskaya, N. Podymova
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引用次数: 0

摘要

目前,一个亟待解决的问题是开发用于量化复合材料结构局部孔隙率水平的非破坏性诊断技术。本文介绍了一种根据实验测量到的纵向声波在材料中传播的相位速度估算材料孔隙率的方法。利用激光激发超声波产生探测脉冲。利用实验测得的纵向声波在复合材料中传播的相位速度计算孔隙率。所提出的方法允许在测量过程中单向进入物体,这使得研究厚度可变、形状复杂的结构成为可能。以三块碳纤维桁架板为例,证明了获得所研究结构部分局部孔隙率值分布的可能性。研究表明,孔隙率值的局部性及其点与点之间的变化在此类结构中起着重要作用,板材这一区域的最大局部孔隙率可能与平均体积孔隙率相差两倍以上。此外,还展示了在铺设碳纤维织物的平面上获得板材局部孔隙率分布 "地图 "的可能性。这种方法具有很强的可操作性,可以在实际生产中使用,以改善生产条件和方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
QUANTITATIVE ANALYSIS OF THE DISTRIBUTION OF LOCAL POROSITY IN CARBON FIBER STRUCTURES BY LASER OPTOACOUSTIC METHOD
Currently, an urgent problem is the development of non-destructive diagnostic techniques for quantifying the level of local porosity of composite structures. The paper presents a method for estimating the porosity of a material from the experimentally measured phase velocity of longitudinal acoustic waves propagating in it. Laser excitation of ultrasound was used to create probing pulses. Porosity was calculated using experimentally measured phase velocities of longitudinal acoustic waves propagating in the composite. The proposed method allows one-way access to the object during measurements, which makes it possible to study structures of variable thickness and complex shape. The possibility of obtaining distributions of local porosity values in the studied section of the structure is demonstrated by the example of three carbon fiber stringer panels. The study showed that locality of the porosity value and its change from point to point plays an important role in such constructions, and the maximum local porosity of this area of the panel may differ from the average volumetric porosity by more than two times. The possibility of obtaining a “map” of the distribution of the local porosity of the panel section in the plane of laying the carbon fabric is also demonstrated. This method is quite operational, which allows it to be used within the framework of real production in order to improve the conditions and methods of production.
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