循环拉伸下形状记忆合金纤维增强ECC的闭缝性能研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (3): 816-826.

所属专题：水泥混凝土

循环拉伸下形状记忆合金纤维增强ECC的闭缝性能研究

刘宇¹, 杨曌^1,2, 邓鑫³, 熊浩¹

1.武汉科技大学城市建设学院,武汉 430065;
2.武汉科技大学城市更新湖北省工程研究中心,武汉 430065;
3.武汉市中心工程检测有限公司,武汉 430014

收稿日期:2022-10-24 修订日期:2022-11-28 出版日期:2023-03-15 发布日期:2023-03-31
通信作者: 杨曌,博士,教授。E-mail:yzwh77@163.com
作者简介:刘宇(1997—),男,硕士研究生。主要从事智能材料方面的研究。E-mail:152837020@qq.com
基金资助:
国家自然科学基金(52178158);湖北省自然科学基金(2019CFB540);国家级大学生创新创业训练计划(202110488009)

Crack-Closing Performance of Shape Memory Alloy Fiber Reinforced ECC under Cyclic Tension

LIU Yu¹, YANG Zhao^1,2, DENG Xin³, XIONG Hao¹

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Hubei Provincial Engineering Research Center of Urban Regeneration, Wuhan University of Science and Technology, Wuhan 430065, China;
3. Wuhan Central Engineering Test Co., Ltd., Wuhan 430014, China

Received:2022-10-24 Revised:2022-11-28 Online:2023-03-15 Published:2023-03-31

摘要/Abstract

摘要： 将不同掺量和不同直径的形状记忆合金(SMA)纤维埋入工程水泥基复合材料(ECC)制得形状记忆合金纤维增强工程水泥基复合材料(SMAF-ECC),通过单轴循环拉伸试验研究SMA纤维直径和纤维掺量对SMAF-ECC试件拉伸应力-应变关系、残余应变、裂缝宽度和裂缝恢复率的影响。结果表明:打结形SMA纤维的加入提高了ECC的极限应变和极限抗拉强度;提高纤维掺量可有效提高SMAF-ECC试件的应变和裂缝恢复率,试验所得试件的最大应变恢复率和裂缝恢复率分别达到69%和77%;纤维直径在一定范围内增长,可以提高应变和裂缝恢复率,纤维直径过小会导致恢复率减小。研究成果为新型SMAF-ECC试件的推广应用提供了理论依据。

关键词: 形状记忆合金纤维, 纤维增强, 超弹性, 循环拉伸, 裂缝宽度, 应变恢复率, 裂缝恢复率

Abstract: The effects of shape memory alloy (SMA) fiber with different content and different diameter on tensile stress-strain relationship, residual strain, crack width and crack recovery rate of engineered cementitious composites (ECC) were studied by uniaxial cyclic tensile test. The results show that the addition of knotted-shaped SMA fiber improves the ultimate strain and ultimate tensile strength of ECC, and the strain recovery rate of pure ECC without SMA fiber is 12% in the late cycle. The strain recovery rate of SMAF-ECC specimens doped with 1.00% (volume fraction) 0.5 mm SMA fiber is as high as 69%, and the crack recovery rate of SMA fiber with 1.00% (volume fraction) 0.5 mm diameter enhanced ECC is 77%. If the fiber diameter grows in a certain range, the strain and fracture recovery rate can be improved, if the fiber diameter is too small, the recovery rate will decrease. The research results provide a theoretical basis for the popularization and application of the new SMAF-ECC specimens.

Key words: shape memory alloy fiber, fiber reinforced, hyperelasticity, cyclic tensile, crack width, strain recovery rate, crack recovery rate

中图分类号:

TU352.11

刘宇, 杨曌, 邓鑫, 熊浩. 循环拉伸下形状记忆合金纤维增强ECC的闭缝性能研究[J]. 硅酸盐通报, 2023, 42(3): 816-826.

LIU Yu, YANG Zhao, DENG Xin, XIONG Hao. Crack-Closing Performance of Shape Memory Alloy Fiber Reinforced ECC under Cyclic Tension[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 816-826.

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循环拉伸下形状记忆合金纤维增强ECC的闭缝性能研究

Crack-Closing Performance of Shape Memory Alloy Fiber Reinforced ECC under Cyclic Tension

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