时效条件下fe - sma -钢异种粘结接头破坏机理及抗剪强度

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-26 DOI:10.1016/j.tws.2025.114032

Yue Shu, Xu Jiang, Xuhong Qiang, Wulong Chen

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引用次数: 0

摘要

由于其形状记忆效应和实现均匀应力分布的能力，结合铁基形状记忆合金（Fe-SMA）贴片已成为加强老化钢结构的一种有前途的解决方案，可以显著改善机械性能。然而，Fe-SMA-钢异种粘结接头（dbj）的耐久性仍然没有得到充分的了解，这限制了Fe-SMA粘结贴片在结构增强中的更广泛应用。本研究基于108个试件的试验结果，建立并验证了Fe-SMA-to-steel DBJs的数值模型。利用验证的模型分析了dbj在不同参数下的渐进损伤，包括粘结长度、胶粘剂类型、胶粘剂厚度、Fe-SMA厚度和老化条件。计算结果与试验结果吻合较好，对极限剪切荷载的最大预测误差为14%，平均预测误差为3%。数值分析表明，剪切应力的传递受有效键区控制，并提出了确定有效键长的玻尔兹曼预测模型。这个长度随着曝光时间的增加而增加，最大可增加74%。dbj的极限剪切载荷随Fe-SMA厚度的平方根线性提高，不受老化条件和胶粘剂类型的影响。然而，随着暴露时间的延长，极限剪切载荷呈下降趋势。这些研究成果为fe - sma粘接加固基础设施的设计提供了有价值的指导，保证了实际场景下母结构的可靠性和耐久性，有助于减少基础设施的碳排放。

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Failure mechanism and shear strength of Fe-SMA-to-steel dissimilar bonded joints under aging conditions

Owing to their shape memory effect and ability to achieve uniform stress distribution, bonded iron-based shape memory alloy (Fe-SMA) patches have emerged as a promising solution for strengthening aging steel structures, offering significant improvements in mechanical performance. However, the durability of Fe-SMA-to-steel dissimilar bonded joints (DBJs) remains insufficiently understood, limiting the wider application of bonded Fe-SMA patches in structural reinforcements. This study establishes and validates numerical models of Fe-SMA-to-steel DBJs based on experimental results from 108 specimens. The validated model is employed to analyze the progressive damage of DBJs under various parameters, including bond length, adhesive type, adhesive thickness, Fe-SMA thickness, and aging condition. The numerical results show good agreement with experimental results, with maximum and average prediction errors of 14 % and 3 % on the ultimate shear load, respectively. The numerical analysis reveals that the transfer of shear stress is governed by an effective bond region, and the Boltzmann predicting model is proposed to determine the effective bond length. This length increases with the exposure time, reaching a maximum improvement of 74 %. The ultimate shear load of DBJs linearly improves with the square root of Fe-SMA thickness, unaffected by aging conditions and adhesive types. Nevertheless, the ultimate shear load declines with the prolonged exposure time. These research findings offer valuable design guidelines for adhesively Fe-SMA-reinforced infrastructures, guaranteeing the reliability and durability of the parent structures in practical scenarios and contributing to reducing the carbon emissions of infrastructures.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.