Abstract
To clarify the differences in the retarding effects by employing the steel and Fe-SMA sheet reinforcements, both fatigue tests and finite element (FE) analysis were conducted in the present study. The experimental phenomenon, monitored strain variation, crack propagation, fatigue life, fatigue fracture surface, and SIFs at the crack tip were analyzed. Compared to the steel sheets reinforcement, better retarding effect could be achieved by the Fe-SMA sheets reinforcement since the SIF has further decreased by 18 % and the fatigue failure life has further increased by 43 % and 22 %. Regarding the steel/Fe-SMA sheets composite reinforcement, the fatigue failure life has decreased by 12 % and 9 %, indicating the inefficiency of such reinforcement configuration. The SIF at the crack tip decreases linearly with the increasing activation temperature of the Fe-SMA sheet. In the presence of an activation temperature of approximately 35 °C, a similar retarding effect to the steel sheets reinforcement could be achieved by bonding Fe-SMA sheets, indicating that it is acceptable to apply the not fully activated Fe-SMA sheet to the reinforcement of cracked components in practical engineering.
Published Version
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