Research On The Impact Of Biaxial Curvature Marine Plate’s Strain Distribution After Cold And Heat Integration Forming

With the development of technology, modern shipbuilding industry has bid farewell to the era of the original labor-intensive and gradually become more digital and automatic. Under this circumstance, the automatic forming of marine plate has been emerging as an urgent problem to be solved. The existing domestic and international studies have shown that the shape after forming is related to inherent strain. Based on the project of “automatic forming system of biaxial curvature marine plate”, a new method of cold and heat integration forming is proposed. This method uses induction heating as the hot loading method, and a pair of rolling wheels as the cold loading method. The distance of hot and cold loading remains the same. And all of the loading can rotate in order to load from any direction. In conclusion, the basic research about strain distribution after cold and heat integration forming is of high significance.At first, this paper proposes numerical simulation methods based on thermal elastoplastic finite element theory, and verifies the effectiveness and accuracy of the numerical simulation method which relates to many nonlinear problems. With the biaxial curvature marine plate as studied object, taking the radius of heat source and the maximum temperature of plate as hot loading parameters, descending distance of up rolling wheel as cold loading parameter, to analyze strain distribution after cold and hot integration forming by ABAQUS numerical simulation.The results show that the width of plastic area doesn’t correlate with the maximum temperature, and is proportional to the radius of heat source. The width of plastic area increases with the descending distance but will not exceed the width of bottom wheel. When the hot loading takes a larger proportion, in-plane strain is shrinkage strain. On the contrary, in-plane strain is tensile strain. Bending strain is proportional to all the loading parameters, while the descending distance has the most essential impact on bending strain.