Hong Ki-Nam, Ji Sang-Won, Yeon Yeong-Mo
Department of Civil Engineering, Chungbuk National University, Chungbuk 28644, Republic of Korea.
Materials (Basel). 2025 Apr 9;18(8):1703. doi: 10.3390/ma18081703.
An Fe-based shape memory alloy (Fe-SMA) is an alloy that has a characteristic of being able to return to its original shape when heated, even after undergoing plastic deformation. Many researchers have conducted various studies to understand the effectiveness of using Fe-SMA in concrete structures. Most studies selected the heating temperature of Fe-SMA to be below 160 °C based on the logic that concrete hydrolyzes when its temperature exceeds 160 °C. However, because the recovery stress of Fe-SMA increases as the heating temperature increases, it is expected that greater prestress could be introduced when the heating temperature is high. In this study, to confirm this, a numerical study was conducted to evaluate the effect of Fe-SMA heating temperature on the flexural performance of concrete members through finite element (FE) analysis. The analysis results showed that the initial crack load of the specimen increased by about 89% to 173% as the heating temperature of Fe-SMA increased. In addition, the accuracy of the proposed FE model (FEM) was verified through experiments. As a result, it was confirmed that the proposed FE analysis can relatively accurately predict the failure mode and load-displacement relationship of the specimen.
铁基形状记忆合金（Fe-SMA）是一种合金，即使在经历塑性变形后，加热时也能恢复到其原始形状。许多研究人员进行了各种研究，以了解在混凝土结构中使用Fe-SMA的有效性。大多数研究选择Fe-SMA的加热温度低于160°C，基于混凝土温度超过160°C时会水解的逻辑。然而，由于Fe-SMA的恢复应力随着加热温度的升高而增加，预计在加热温度较高时可以引入更大的预应力。在本研究中，为了证实这一点，通过有限元（FE）分析进行了数值研究，以评估Fe-SMA加热温度对混凝土构件抗弯性能的影响。分析结果表明，随着Fe-SMA加热温度的升高，试件的初始开裂荷载增加了约89%至173%。此外，通过实验验证了所提出的有限元模型（FEM）的准确性。结果证实，所提出的有限元分析能够相对准确地预测试件的破坏模式和荷载-位移关系。
