Finite Element Analysis of the Adhesive behavior of Shape Memory Alloy fiber and Polymer Concrete

In the present study, the pullout behavior of shape memory alloy fibers and concrete was studied. To perform the simulations, a three-dimensional finite element method was used and the supralastic behavior of shape memory fibers was defined using UMAT subroutine in ABAQUS software. In order to consider more realistic assumptions, the interaction between fibers and concrete has been simulated using the concept of transitional area of the contact surface. The contact surface parameters were obtained using the inverse finite element method and experimental test data performed on a fiber sample. After validating the results using experimental testing, the effect of diameter parameters and embedded length on the adhesive behavior of this type of fiber with concrete has been studied. Finally, in order to evaluate the performance of shape memory fiber fibers, the pullout behavior of this type of fiber has been compared with the corresponding steel fibers. The results show that for fibers with a diameter of 0.5 mm, with increasing the embedded length from 10 mm to 30 mm, the pullout strength for SMA and steel fibers increases by about 17% and 12%, respectively. Based on this, it was observed that the use of shape memory fibers significantly improves the effective pullout parameters of fiber from concrete, which can be attributed to the strong surface adhesion forces between shape memory fibers and concrete.