Characterization of composite bonded joints under pure mode II fatigue loading

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composite Structures Pub Date : 2013-01-01 DOI:10.1016/j.compstruct.2012.07.031

Maria V. Fernández, Marcelo F.S.F. de Moura, Lucas F.M. da Silva, António T. Marques

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引用次数: 27

Abstract

An experimental investigation concerning adhesively bonded composite joints subjected to mode II fatigue loading was performed in this work. End-Notched Flexure (ENF) tests with carbon/epoxy adherends bonded with a ductile epoxy adhesive were used. The Paris-law which establishes a relationship between the fatigue crack growth rate and the variation of the energy release rate was applied. The energy release rate was estimated by means of an equivalent crack length method based on specimen compliance and beam theory. The proposed method includes the effect of the adhesive on the specimen compliance and overcomes the difficulty associated to crack length monitoring during the test, since the crack is not a measured parameter but a calculated one. Additionally, the presence of a non-negligible fracture process zone is accounted for, since the equivalent crack is estimated from the specimen compliance which is influenced by the presence of the fracture process zone. This is a crucial issue, particularly when adhesives with some ductility are used in fatigue tests. Several experimental ENF fatigue tests were performed and consistent results were obtained. It was concluded that the proposed procedure is adequate for fatigue characterization of composite bonded joints under mode II loading.

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纯II型疲劳载荷下复合材料粘结接头的特性研究

本文对粘接复合材料接头在II型疲劳载荷作用下进行了试验研究。末端缺口弯曲(ENF)试验采用碳/环氧胶粘剂粘接与韧性环氧胶粘剂。采用paris定律建立了疲劳裂纹扩展速率与能量释放速率变化之间的关系。利用基于试件柔度和梁理论的等效裂纹长度法估算了能量释放率。该方法考虑了胶粘剂对试件顺应性的影响，克服了试验过程中裂缝长度监测的困难，因为裂缝不是测量参数，而是计算参数。此外，考虑到不可忽略的断裂过程带的存在，因为等效裂纹是根据受断裂过程带存在影响的试件顺应性估计的。这是一个至关重要的问题，特别是当在疲劳试验中使用具有一定延展性的粘合剂时。进行了多次ENF疲劳试验，得到了一致的结果。结果表明，该方法可用于II型载荷下复合材料粘结接头的疲劳表征。

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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.