湿热老化对丙烯酸与环氧胶粘剂CFRP搭接接头抗拉强度影响的比较分析

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-09-24 DOI:10.1016/j.compstruct.2025.119699

Dong Chen , Junwei Zhang , Kou Du , Meng Weng , Zhaohui Bai , Cheng Li , Jianwei Shi

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引用次数: 0

摘要

碳纤维增强聚合物（CFRP）因其重量轻、比强度高而得到广泛应用。然而，对于单搭接胶粘接接头在湿热条件下的耐久性研究仍然不足。因此，研究了cfrp - slj在不同胶粘剂下的老化过程和残余强度。在55℃和95%相对湿度（RH）条件下加速湿热老化试验。加速老化时间是25℃70% RH环境下的5.77倍。分别对CFRP粘结层和粘结层的吸湿性能进行了分析。在相同时效时间后，比较了丙烯酸基和环氧基试样的残余拉伸强度和降低率。对于每个试件，采用数字图像相关（DIC）技术记录从开始到断裂的变形和载荷-位移曲线。然后用超深度显微镜分析了失效表面的形貌。为了评估其性能并阐明其失效机理，对其进行了有限元模拟。结合实验结果，将拉伸力定位于结合界面上的相关峰值应力，并对断裂演化进行了预测。结果表明，湿热时间越短，丙烯酸基胶粘剂的性能越好。但从降低率来看，环氧树脂基的耐老化性能较好，特别是当湿热时间较长时。本文提出的耦合方法和研究结果可为CFRP粘接结构的设计提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Hygrothermal aging effects on tensile strength of acrylic vs. epoxy adhesive CFRP lap joints: a comparative analysis

Carbon fiber reinforced polymer (CFRP) bonded structures are widely used due to their lightweight and high specific strength. However, research on durability of adhesively bonded single lap joint (SLJ) under hygrothermal conditions remain insufficient. Therefore, the aging process and residual strength of CFRP-bonded SLJs with different adhesives were studied. Condition were set to 55 °C and 95 % relative humidity (RH) to accelerate the hygrothermal aging tests. The accelerated aging time represents 5.77 times of that in 25 °C 70 %RH environment. Moisture absorption behavior of CFRP adherent and adhesive layer were analyzed, respectively. After the same aging period, residual tensile strength and decrease rate of acrylic-based specimens and epoxy-based specimens were compared. For each specimen, Digital image correlation (DIC) technique is used to record the deformation and load–displacement curve from the beginning until fracture. Then the morphology of the failure surfaces was analyzed by using a super-depth microscope. To evaluate their performance and clarify the failure mechanisms, Finite element method (FEM) simulations were conducted. Coupling with experiment results, tensile force was addressed to the correlated peak stress on the bonding interface, and fracture evolution were predicted. The results show if hygrothermal time is short, the acrylic-based adhesive behaves better. But from the view of decrease rate, epoxy-based show better aging resistance, especially when hygrothermal time is longer. The proposed coupling method and study results may help in the design of adhesively bonded CFRP structures.

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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.