PSI - Issue 64

Ali Saeedi et al. / Procedia Structural Integrity 64 (2024) 2044–2050 Ali Saeedi/ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 6. Temperature distribution in the cross section view for different dimensions of the reinforcement

3.4. Effect of reinforcement shape

The results demonstrate that under the same cross-sectional area and activation voltage, the temperature in the bar is significantly higher than in the strip. Specifically, a bar with a diameter of 7 mm reaches a temperature that is 28% higher than a strip with an equivalent cross-sectional area. The temperature distribution in the concrete beam after 2 minutes of activation is shown in Fig. 7. This variation are mainly attributed to the differing contact areas between the reinforcement types and the concrete. Heat transfer between the SMA and concrete occurs primarily through conduction, which is directly influenced by the contact surface area. The strip has a greater contact surface compared to the bar with the same cross-sectional area, resulting in more efficient heat dissipation and thus a lower temperature in the strip.

Fig. 7. Temperature distribution in the cross section view 120 seconds after activation