Retarding effect on cracked steel plates strengthened by Fe-SMA and steel sheets

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Constructional Steel Research Pub Date : 2024-11-27 DOI:10.1016/j.jcsr.2024.109190

Qiudong Wang , Shanchun Shi , Libin Wang , Zhiqiang Wang , Bohai Ji , Jie Liu

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Abstract

To clarify the differences in the retarding effects by employing the steel and Fe-SMA sheet reinforcements, both fatigue tests and finite element (FE) analysis were conducted in the present study. The experimental phenomenon, monitored strain variation, crack propagation, fatigue life, fatigue fracture surface, and SIFs at the crack tip were analyzed. Compared to the steel sheets reinforcement, better retarding effect could be achieved by the Fe-SMA sheets reinforcement since the SIF has further decreased by 18 % and the fatigue failure life has further increased by 43 % and 22 %. Regarding the steel/Fe-SMA sheets composite reinforcement, the fatigue failure life has decreased by 12 % and 9 %, indicating the inefficiency of such reinforcement configuration. The SIF at the crack tip decreases linearly with the increasing activation temperature of the Fe-SMA sheet. In the presence of an activation temperature of approximately 35 °C, a similar retarding effect to the steel sheets reinforcement could be achieved by bonding Fe-SMA sheets, indicating that it is acceptable to apply the not fully activated Fe-SMA sheet to the reinforcement of cracked components in practical engineering.

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用 Fe-SMA 和钢板加固的开裂钢板的延缓效应

为了明确钢和 Fe-SMA 片状加固材料在延缓效应方面的差异，本研究同时进行了疲劳试验和有限元分析。对实验现象、监测应变变化、裂纹扩展、疲劳寿命、疲劳断裂面和裂纹尖端的 SIF 进行了分析。与钢板加固相比，Fe-SMA 板加固的延缓效应更好，因为 SIF 进一步降低了 18%，疲劳破坏寿命进一步提高了 43% 和 22%。而钢材/铁-SMA 板复合加固材料的疲劳破坏寿命则分别降低了 12% 和 9%，表明这种加固结构的效率较低。裂纹尖端的 SIF 随 Fe-SMA 片材活化温度的升高而线性降低。在活化温度约为 35 °C 的情况下，通过粘结 Fe-SMA 片材可以达到与钢片加固类似的延缓效应，这表明在实际工程中可以将未完全活化的 Fe-SMA 片材用于裂纹部件的加固。

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来源期刊

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.