Experiments of double curvature plate bending with induction heating and processing parameters investigation by computational analysis

Abstract

plate bending with double curvature is an essential procedure in shipbuilding, which is also a bottleneck problem to restrict the fabrication schedule and dimensional accuracy. With the induction heating technology, plate bending with double curvature as saddle and sail types, was conducted experimentally. Meanwhile, due to the rated output power of induction heating, heat input as well as moving speed of induction heating coil has a significant influence on maximal temperature and final bending deformation. In addition, out-of-plane bending deformation with different patterns can be observed and their magnitudes were also measured by three-coordinate measuring machine (TMM). Computational analysis with thermal elastic plastic (TEP) and elastic FE approaches was then employed to investigate processing parameters of induction heating. Computed out-of-plane bending deformations have a good agreement with measurement about not only deformed shape but also magnitudes. Elastic FE computation with bending moment as input loading has much more obvious efficiency comparing to conventional TEP FE computation without loss of computational accuracy. Moreover, generation mechanism of bending deformation with different patterns was also examined and clarified with in-plane plastic strains caused by induction heating, which will be converted to shrinkage force and bending moment for plate bending.