An analytical model for crack monitoring of the shape memory alloy intelligent concrete

Abstract

A theoretical model for the crack monitoring of the shape memory alloy intelligent concrete is presented in this work. The mechanical properties of shape memory alloy materials are first given by the experimental test. The one-dimensional constitutive model of the shape memory alloys is reviewed by degenerating from a three-dimensional model, and the behaviors of the shape memory alloys under different working conditions are then discussed. By combining the electrical resistivity model and the one-dimensional shape memory alloy constitutive model, the crack monitoring model of the shape memory alloy intelligent concrete is given, and the relationships between the crack width of the concrete and the electrical resistance variation of the shape memory alloy materials for different crack monitoring processes of shape memory alloy intelligent concrete are finally presented. The numerical results of the present model are compared with the published experimental data to verify the correctness of the model.

Experimental investigation on flexural performance of concrete beams strengthened with SMA-GFRP-ECC smart composite materials

“…According to the differential scanning calorimeter measurement (DSC), the inverse martensitic transformation temperature ( A f ) was −15°C. In order to give full play to the superelasticity of SMA (Liu et al, 2020), the material was subjected to a heat treatment process, with SMA bars placed and heated in the muffle furnace at 400°C for 15 min. Thereafter, the SMA material was preheated alternately with cold water and hot water five times before the material was stretched, to ensure the stability of the mechanical properties.…”

“…Meanwhile, the residual displacement, the crack spacing, and the flexural stiffness could be considerably reduced (Elbahy and Youssef, 2019; Emad and Asteetah, 2022; Pei et al, 2023), the energy dissipation could be increased under multiple cyclic loads (Mehdi et al, 2017). It should be pointed out, however, that the promising crack control ability of SMA in healing concrete members is mainly for microcracks, rather than large crack recovery (Chen et al, 2021; Liu et al, 2020).…”

Three-dimensional braided composites as innovative smart structural reinforcements

“…Hence, structural health monitoring (SHM) of concrete structures is widely used for the evaluation of the condition of the infrastructure based on measuring real-time strain values as a crucial parameter of the structure [7][8][9]. However, despite many advances in SHM techniques, most methods involve a limited number of sensors, such as strain gauges, piezoelectric ceramics, and optic sensors, distributed over a wide range of infrastructures [4,10,11]. These monitoring techniques create local low-resolution detection systems for concrete structures [12][13][14].…”

A novel smart assistive knee brace incorporated with shape memory alloy wire actuator

“…Recently, the use of shape memory alloy (SMA) materials has been significantly increasing due to their unique properties such as adapting intelligently to external disturbances (Khodaei and Terriault, 2018; Kuo et al, 2012; Liu et al, 2020; Sohn et al, 2018; Vignoli et al, 2020). An SMA is categorized as a smart material capable of changing its crystal structure between the martensite phase and the austenite phase through thermo-mechanical loading.…”