Ultrasonic Evaluation of Porosity in Out-of-Autoclave Carbon Fiber–Reinforced Polymer Composite Material

IF 0.5 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Evaluation Pub Date : 2021-12-01 DOI:10.32548/2021.me-04198

D. Samaratunga, Joseph V. Severino, S. Kenderian

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引用次数: 1

Abstract

Ultrasonic longitudinal wave propagation is studied in out-of-autoclave (OoA) carbon fiber–reinforced polymer composite material with varying levels of porosity contents. A combination of cure pressures and a solvent is used to produce specimens with void contents in the range of 0% to 22%. Ultrasonic measurements are made in through-transmission mode, and the data is processed to study various aspects of wave interaction with porosity in OoA specimens. The specimens with a wide range of void contents have enabled the study of broader trends of ultrasonic center frequency, wave velocity, and attenuation with respect to porosity. Results show ultrasonic center frequency and wave velocity are decreased linearly as the void content increases. The relationship of ultrasonic wave attenuation can be approximated by a logarithmic relationship when considering the full range of void content studied. Strength measurements of specimens with varying void contents are made using the flatwise tensile (FWT) test. It is observed that the strength rapidly decreases with increasing porosity. Correlations made between FWT strength, ultrasonic wave velocity, and attenuation are best described by logarithmic relationships. The data shows a potential for inferring strength knockdowns due to the presence of porosity based on ultrasonic measurements.

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非热压灭菌碳纤维增强聚合物复合材料孔隙率的超声评价

研究了不同孔隙率水平的热压罐外碳纤维增强聚合物复合材料中超声波的传播。固化压力和溶剂的组合用于制备空隙含量在0%至22%范围内的试样。超声波测量是在透射模式下进行的，并对数据进行处理，以研究OoA样品中波与孔隙率相互作用的各个方面。具有宽范围孔隙含量的试样使得能够研究超声中心频率、波速和衰减相对于孔隙率的更广泛趋势。结果表明，随着空隙率的增加，超声中心频率和波速呈线性下降。当考虑所研究的孔隙含量的整个范围时，超声波衰减的关系可以用对数关系来近似。采用平面拉伸（FWT）试验对不同孔隙含量的试样进行强度测量。观察到强度随着孔隙率的增加而迅速降低。FWT强度、超声波速度和衰减之间的相关性最好用对数关系来描述。数据显示，由于存在基于超声波测量的孔隙率，有可能推断强度下降。

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来源期刊

Materials Evaluation 工程技术-材料科学：表征与测试

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Materials Evaluation publishes articles, news and features intended to increase the NDT practitioner’s knowledge of the science and technology involved in the field, bringing informative articles to the NDT public while highlighting the ongoing efforts of ASNT to fulfill its mission. M.E. is a peer-reviewed journal, relying on technicians and researchers to help grow and educate its members by providing relevant, cutting-edge and exclusive content containing technical details and discussions. The only periodical of its kind, M.E. is circulated to members and nonmember paid subscribers. The magazine is truly international in scope, with readers in over 90 nations. The journal’s history and archive reaches back to the earliest formative days of the Society.