LAUSR

Abstract This paper mainly investigated temperature and deformation behavior of ship hull plate by moving induction heating using double-circuit inductor with opposite-direction current and gap (ODIG). Mutually-coupled electromagnetic-thermal (EMT) analysis considering temperature-dependent material properties was iteratively implemented at each moving step of inductor, followed with thermal-mechanical (TM) analysis to obtain thermal deformation, and then validated by experiment. Effects of three technological parameters on thermal forming behavior (maximum temperature Tum, breadth b, depth h) and transverse thermal deformations (shrinkage δz and bending angular θz deformation) were analyzed, respectively. Besides, simplified analytical prediction for δz, θz were derived based on inherent strain and plate strip, and compared with those from TM analysis. Finally, composite quality indicator f was constructed through using Tum, b, h by PCA method and utilized to determine optimal shape parameters for ODIG based on Taguchi method, which were compared with those through using δz and θz, respectively. The results indicate that Opt-f can achieve the same f, δz, θz as those from Opt-S and Opt-B, and the best combination is C14C34T24Hy1. Therefore, f can be effectively utilized to determine optimal ODIG inductor in order to improve transverse thermal deformations (δz, θz).