Mechanical Response and Failure Mechanism of AFRP-repaired Corroded CHS Tubes Under Axial Compression

IF 2.3 4区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Applied Composite Materials Pub Date : 2024-04-25 DOI:10.1007/s10443-024-10222-3

Changzi Wang, Xiaofei Cui, Yufeng Jiang, Lingjun Xie, Wentao He

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Abstract

Corrosion-induced defects, extensive and unavoidable in marine structures, pose significant threats to structural integrity and safety. This study aims to assess mechanical response and investigate the failure mechanism of composite-repaired circular hollow section (CHS) steel tubes. A feasibility analysis is conducted through verifying the axial compression performance of a uniformly corroded tube and an Aramid fiber-reinforced polymer (AFRP) strengthened perfect tube. Subsequently, mechanical responses of the corroded and AFRP-repaired tubes are studied, accompanied by parametric studies to comprehensively evaluate the influence of corrosion region, and the depths and densities of corrosion pits. Consequently, critical damage modes of the AFRP patches are explored using a user-defined material subroutine developed based on Hashin failure and Yeh delamination damage criteria. Numerical predictions indicate that composite patches improve the structural residual strength, but not necessarily enhance the structural ductility under diverse failure patterns. In addition, AFRP patches contribute to improving the overall structural load-bearing capacity by alleviating local buckling or regional collapse. Moreover, fiber compression damage emerges as the dominant mode. Premature failure of putty agent initiates stress concentration, intensifies subcritical damage, aggravates critical damage, and expedites final failure.

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轴向压缩下经 AFRP 修复的腐蚀 CHS 管的机械响应和失效机理

腐蚀引起的缺陷在海洋结构中广泛存在且不可避免，对结构的完整性和安全性构成重大威胁。本研究旨在评估复合材料修复的圆形空心截面（CHS）钢管的机械响应并研究其失效机理。通过验证均匀腐蚀钢管和芳纶纤维增强聚合物 (AFRP) 加固完美钢管的轴向压缩性能，进行了可行性分析。随后，研究了腐蚀钢管和 AFRP 修复钢管的机械响应，并进行了参数研究，以全面评估腐蚀区域的影响以及腐蚀坑的深度和密度。因此，使用基于 Hashin 失效和 Yeh 分层破坏标准开发的用户自定义材料子程序，探索了 AFRP 补丁的临界破坏模式。数值预测结果表明，复合材料补片可提高结构残余强度，但不一定能增强不同破坏模式下的结构延展性。此外，AFRP 补丁通过减轻局部屈曲或区域塌陷，有助于提高整体结构的承载能力。此外，纤维压缩破坏是主要的破坏模式。腻子剂的过早失效会导致应力集中、亚临界破坏加剧、临界破坏恶化并加速最终失效。

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来源期刊

Applied Composite Materials 工程技术-材料科学：复合

CiteScore

4.20

自引率

4.30%

发文量

审稿时长

1.6 months

期刊介绍： Applied Composite Materials is an international journal dedicated to the publication of original full-length papers, review articles and short communications of the highest quality that advance the development and application of engineering composite materials. Its articles identify problems that limit the performance and reliability of the composite material and composite part; and propose solutions that lead to innovation in design and the successful exploitation and commercialization of composite materials across the widest spectrum of engineering uses. The main focus is on the quantitative descriptions of material systems and processing routes. Coverage includes management of time-dependent changes in microscopic and macroscopic structure and its exploitation from the material''s conception through to its eventual obsolescence.