Abstract
Abstract. Local line rolling forming is a common forming approach for the complex curvature plate of ships. However, the processing mode based on artificial experience is still applied at present, because it is difficult to integrally determine relational data for the forming shape, processing path, and process parameters used to drive automation equipment. Numerical simulation is currently the major approach for generating such complex relational data. Therefore, a highly precise and effective numerical computation method becomes crucial in the development of the automated local line rolling forming system for producing complex curvature plates used in ships. In this study, a three-dimensional elastoplastic finite element method was first employed to perform numerical computations for local line rolling forming, and the corresponding deformation and strain distribution features were acquired. In addition, according to the characteristics of strain distributions, a simplified deformation simulation method, based on the deformation obtained by applying strain was presented. Compared to the results of the three-dimensional elastoplastic finite element method, this simplified deformation simulation method was verified to provide high computational accuracy, and this could result in a substantial reduction in calculation time. Thus, the application of the simplified deformation simulation method was further explored in the case of multiple rolling loading paths. Moreover, it was also utilized to calculate the local line rolling forming for the typical complex curvature plate of ships. Research findings indicated that the simplified deformation simulation method was an effective tool for rapidly obtaining relationships between the forming shape, processing path, and process parameters.
Highlights
At present, forming of the complex curvature plate for ships can be classified into mechanical cold forming and thermal forming from the viewpoint of the loading method
Based on the three-dimensional elastoplastic finite element method, deformations obtained by one- and two-local line rolling are compared relative to their computational accuracies and time
This study focuses on a local line rolling forming method commonly used in complex curvature plate forming in the manufacture of ships
Summary
At present, forming of the complex curvature plate for ships can be classified into mechanical cold forming and thermal forming from the viewpoint of the loading method. Similar to the line heating plate forming method, it involves gradual forming; the overall shape is realized based on the control over local deformation Such a forming method requires small equipment dimensions and low costs. Based on the three-dimensional elastoplastic finite element method, deformations obtained by one- and two-local line rolling are compared relative to their computational accuracies and time On this basis, the possibility of employing this method to determine the typical complex curvature plate shape in multi-local line rolling is examined. With the objective of obtaining relationships between the simplified deformation simulation method and deformation shape, the possibility of utilizing such a method to rapidly conduct a large number of deformation simulation calculations based on the local line rolling forming is verified under conditions of diverse loading paths and forces
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