Numerical Simulation Analysis of Line Heat Forming Aiding by Electromagnetic Force
|School||Dalian University of Technology|
|Course||Design and manufacture of ships and marine structures|
|Keywords||Electromagnetic Force Line Heating Plastic Strain Couple Finite Element|
In the process of ship curved plate forming, line heat forming technique has been used as the most popular forming method by shipyards all over the world. For line heat forming, bend deformation occurs when metal plate internally produces heat stress in the process of local heating and cooling, so the forming effect become poor when the steel plate is thick or seriously bend. The steel plate needs to be processed many times. For high-strength steel which is apt to produce crack, the line heat forming technique has a contradiction between keeping the temperature not too high and achieving the expectant deformation. As a result of these disadvantages line heat forming technique has, a new method of aiding line heat forming with electromagnetic force is put forward in this paper.This paper simulates the process of aiding line heat forming with electromagnetic force by using finite element (FE) analysis software ANSYS. First of all, to establish electromagnetic-circuit coupled FE model, simulate the discharging process of electromagnetic coil, gain the variation laws of discharging current in coil and the characteristic of electromagnetic force in period and space; to establish electromagnetic-structure coupled FE model, load the electromagnetic force, gain strain situation of steel plate. Then to consider the influence of temperature to electromagnetic force, load temperature to steel plate structure, gain the strain of steel plate under the action of temperature and electromagnetic force, analyze the action mechanism of electromagnetic force to line heat forming.Finally, to analyze the influence of discharging circuit parameters and geometrical parameters to electromagnetic force, provide theory reference for further research.