1. Mechanical Properties of SMA/PVA-ECC under Uniaxial Tensile Loading.
- Author
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Yang, Zhao, Li, Jiankun, Zhong, Yilan, and Qi, Xiaolong
- Subjects
MECHANICAL behavior of materials ,SHAPE memory alloys ,FIBROUS composites ,STRESS-strain curves ,CRACK closure ,ULTIMATE strength - Abstract
Although shape memory alloy/Polyvinyl alcohol (SMA/PVA) hybrid fiber reinforced cementitious composites, (SMA/PVA-ECC) exhibit excellent crack closure and deformation recovery capabilities, however, the research on their fundamental mechanical properties is still limited. This study investigates the tensile mechanical properties of SMA/PVA-ECC materials by conducting uniaxial tensile tests, analyzing the failure behavior, stress–strain curves, and characteristic parameters of the specimens, comparing the influence of SMA fiber content and diameter, and establishing a tensile constitutive model. The results show that the residual crack width of SMA/PVA-ECC specimens significantly decreases after unloading, and SMA fiber content and diameter have a significant impact on the tensile properties of the specimens. The comprehensive tensile properties of specimens with a fiber diameter of 0.2 mm and content of 0.2% are the best, with their initial cracking strength, ultimate strength, and strain increasing by 56.4%, 23.6%, and 13.4%, respectively, compared to ECC specimens. The proposed bilinear tensile constitutive model has high accuracy. This study provides a theoretical basis for further research on SMA/PVA-ECC materials. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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