In-line monitoring of cryogenic three-point bending test of fiber-reinforced composites using acoustic emission

IF 2.3 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES
Björn Maack
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Abstract

Remotely in-line monitored acoustic emission (AE) of interlaminar shear strength tests in a 3-point bending test of fiber-reinforced polymer composites (FRP) conducted under cryogenic conditions in liquid nitrogen (LN2) were studied. The AE sensors were reversibly mounted at the outer components of the testing machine to thermally decouple them from the cryogenic area and use AE signal transmission through the testing machine structure as a waveguide. The damage mechanisms and effect of the cryogenic temperature were studied at 296 K room temperature (RT) and in LN2 at 77 K, considering machine and process noises. The correlation of machine data with acoustics and the AE hit analysis revealed matrix cracking as the most frequent damage mechanism under both conditions but with different failure mechanisms. At RT and applying higher loads, the most damage suddenly occurred, and the specimen failed. In LN2, the damage occurred continuously from the beginning of testing. The amount of fiber failure increased, and the AE feature ranges enlarged. This study presents a method by AE for remote monitoring the mechanical response of FRP in cryogenic fluids such as liquid hydrogen. The method provides a new approach to support the more efficient development of FRP materials for storage vessel structures and structural health monitoring systems.
利用声发射对纤维增强复合材料的低温三点弯曲试验进行在线监测
研究了在液氮(LN2)低温条件下进行的纤维增强聚合物复合材料(FRP)三点弯曲试验中层间剪切强度测试的远程在线监测声发射(AE)。AE 传感器可逆地安装在试验机的外部组件上,使其与低温区域热解耦,并通过试验机结构作为波导进行 AE 信号传输。在 296 K 室温(RT)和 77 K 的 LN2 中研究了损伤机制和低温温度的影响,并考虑了机器和过程噪音。机器数据与声学和 AE 撞击分析的相关性表明,在这两种条件下,矩阵开裂是最常见的损坏机制,但其破坏机制各不相同。在 RT 和施加较大载荷时,突然发生的损坏最多,试样失效。在 LN2 条件下,损坏从试验开始就持续发生。纤维破坏量增加,AE 特征范围扩大。本研究提出了一种利用 AE 对液氢等低温流体中 FRP 的机械响应进行远程监控的方法。该方法为更有效地开发用于储存容器结构和结构健康监测系统的玻璃钢材料提供了一种新方法。
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来源期刊
Journal of Composite Materials
Journal of Composite Materials 工程技术-材料科学:复合
CiteScore
5.40
自引率
6.90%
发文量
274
审稿时长
6.8 months
期刊介绍: Consistently ranked in the top 10 of the Thomson Scientific JCR, the Journal of Composite Materials publishes peer reviewed, original research papers from internationally renowned composite materials specialists from industry, universities and research organizations, featuring new advances in materials, processing, design, analysis, testing, performance and applications. This journal is a member of the Committee on Publication Ethics (COPE).
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