Affiliation:
1. Campus in Ho Chi Minh City, University of Transport and Communications, Ho Chi Minh City, Vietnam (corresponding author: )
2. Campus in Ho Chi Minh City, University of Transport and Communications, Ho Chi Minh City, Vietnam
Abstract
A finite-element (FE) pullout model was developed and validated by an earlier experimental pullout test of cold-drawn shape memory alloy crimped fibre. Then, how the dimensions of crimped fibre, such as diameter, wavelength, embedded wave and wave depth, influence its pullout behaviour was investigated. The FE results indicate that the fibre diameter must be large enough to produce a good flexural rigidity. The recommended diameter is ∼1.0 mm. However, it should be noted that the pullout resistance is not improved much for thicker fibre. A short wavelength is more effective than a long one due to a higher maximum pullout stress and more peak points. More embedded waves produce a higher pullout resistance; however, the increasing pullout resistance slows down when the maximum pullout stress exceeds the yield strength. A five-embedded wave is proposed to produce a reasonable pullout resistance while making efficient use of materials. Finally, deep-crimped fibre generates a higher pullout resistance compared with shallow-crimped fibre. On the basis of the effect of the dimensions on the pullout behaviour, an optimum dimension concept is proposed for crimped fibre.