Mode I delamination monitoring in carbon nanotubes-glass fiber/epoxy composites using simultaneous electrical self-sensing and acoustic emission techniques

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-09-21 DOI:10.1016/j.compstruct.2024.118608

María del Pilar de Urquijo-Ventura , Julio Alejandro Rodríguez-González , Carlos Rubio-González

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引用次数: 0

Abstract

The aim of this work is to demonstrate that simultaneous electrical resistance (ER) and acoustic emission (AE) techniques are a viable complementary procedures for in-situ mode I delamination monitoring of glass fiber/epoxy composite laminates containing multiwall carbon nanotubes (MWCNTs). The incorporation of MWCNTs was made by the spray-coating technique and composite laminates were manufactured by means of VARI process. The manufactured laminates were cut into double cantilever beam (DCB) specimens for fracture testing and simultaneous ER and AE measurements were carried out under mode I fracture loading condition. The results showed that the ER signal of the DCB specimens follows the load–displacement (P-δ) curve from initiation to growth of delamination failure, confirming the electrical self-sensing capability of the embedded MWCNT electrical network into the laminate. The correlation of AE events with the P-δ curves of the laminates with and without MWCNTs also allowed to detect the mode I delamination initiation and propagation. Although both the ER and AE techniques demonstrated their capability to determine mode I interlaminar fracture toughness and are in agreement with the results of ASTM standard, the presence of MWCNTs into laminates for self-sensing was more favorable since provided mechanical, electrical and sensing capabilities for SHM applications.

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利用同步电自感应和声发射技术监测碳纳米管-玻璃纤维/环氧树脂复合材料中的 I 型分层

这项工作的目的是证明同时使用电阻（ER）和声发射（AE）技术是对含有多壁碳纳米管（MWCNTs）的玻璃纤维/环氧复合材料层压板进行原位模式 I 分层监测的可行补充程序。采用喷涂技术加入多壁碳纳米管，并通过 VARI 工艺制造复合层压板。将制成的层压板切割成双悬臂梁（DCB）试样进行断裂测试，并在模式 I 断裂加载条件下同时进行了 ER 和 AE 测量。结果表明，DCB 试样的 ER 信号与分层破坏从开始到发展的载荷-位移（P-δ）曲线一致，这证实了嵌入层压板的 MWCNT 电网的电自感能力。有无 MWCNT 的层压板的 AE 事件与 P-δ 曲线的相关性也有助于检测模式 I 分层的起始和扩展。虽然 ER 和 AE 技术都证明了其确定模式 I 层间断裂韧性的能力，并且与 ASTM 标准的结果一致，但在层压板中加入 MWCNT 进行自传感更为有利，因为它为 SHM 应用提供了机械、电气和传感能力。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.