各向异性和各向同性材料的动态弹性模量变化:声发射的比较

Henrique Pina Cardim, Larissa Q. Minillo, Fernando Nakao, A. Ortenzi
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引用次数: 1

摘要

本研究比较了长丝缠绕工艺制备的三种复合管材和钢合金试样在信号源变化情况下的动态弹性模量(E)变化。样品采用±50°、±52.5°和±55°三种不同的缠绕角度制作。模量是通过已知的信号源和角度变化获得的,根据放置在试样表面的两个传感器。在之前的一篇文章中,基于玻璃纤维增强环氧树脂(GFRE)长丝缠绕试样的标准,讨论了在同一类型管道中进行声发射(AE)信号的速度变化。这项工作将这些初步发现与钢制合金管(SAE 1020)的结果进行了比较。该数据与适当的方程一起用于确定每种材料的动态弹性模量。结果表明,即使角差很小,模量也随层合角的变化而变化。因此,质量控制越低,最终产品的复合材料利用率就越低。正如预期的那样,对于各向同性材料(如钢合金),模量沿角度保持恒定,而对于各向异性材料,它取决于应力和应变的主方向,或者另一方面取决于声发射信号的角波速度之间的相关性。
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Dynamic Elastic Modulus Variability in Anisotropic and Isotropic Materials: Comparison by Acoustic Emission
This study compared the variation of the dynamic elastic modulus (E) of three types of composite pipes made by the filament winding process and a steel alloy specimen, according to signal source changes. The specimens were produced with three different winding angles, i.e., ±50°, ±52.5°, and ±55°. The moduli were obtained through a known signal source and the angular variation, according to two sensors positioned over the specimen's surface. In a previous article, the variation in the velocity of acoustic emission (AE) signals, performed in the same type of pipes, was discussed based on the standards for glass fiber-reinforced epoxy (GFRE) filament wound specimens. This work took these preliminary findings to compare with the results found for steel alloy pipes (SAE 1020). This data was used with appropriate equations to determine the dynamic elastic moduli of each material. It was found that, even for small angular differences, the modulus changes position concerning the lamination angle. Thus, the lower the quality control, the lower the final product with composite materials. As expected, for isotropic materials such as steel alloys, the modulus remains constant along the angles, while for anisotropic ones, it is dependent on the principal directions of stress and strain, or on the other hand, dependent on the correlation between the angular wave velocity of the AE signals.
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