| Autor: |
Choi E; Department of Civil Engineering, Hongik University, Seoul 04066, Korea., Ho HV; Department of Civil Engineering, Hongik University, Seoul 04066, Korea., Jeon JS; Department of Civil and Environmental Engineering, Hanyang University, Seoul 04763, Korea. |
| Jazyk: |
angličtina |
| Zdroj: |
Materials (Basel, Switzerland) [Materials (Basel)] 2020 Aug 31; Vol. 13 (17). Date of Electronic Publication: 2020 Aug 31. |
| DOI: |
10.3390/ma13173845 |
| Abstrakt: |
This study investigated the recovery stress and bond resistance of cold drawn crimped SMA fiber using two different initial diameters of 1.0 and 0.7 mm. These characteristics are important to the active prestressing effect and crack-closing of the fiber. NiTi SMA fiber was used for the cold drawing, and then crimped shapes were manufactured with various wave heights. After that, tensile, recovery, and pullout tests were conducted. The cold drawn crimped fiber showed softening tensile behavior more clearly than the cold drawn straight fiber when not subjected to heating, whereas they had the same tensile behavior under heating. The recovery stress and the residual stress of the crimped fibers were less than those of the straight fiber with the same diameter. Moreover, crimped fibers with a large diameter and higher wave height would induce more recovery stress and residual stress. The maximum pullout resistance of the crimped fiber was a function of the wave depth, embedded length, yield strength, and flexural rigidity of the fiber. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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