The Integrated Simulation System For Hot Rolled H-beam With Middle-sized

H-beam is a kind of efficient economic cross-section profiles with wide flange, thin web, more superior cross-section properties and more reasonable ratio of strength to weight, which is more widely used. The hot rolling of H-beam is a highly non-linear plastic deformation process, and the real-time detection of internal information for H-beam in rolled process can not be executed because of the hot environment. With the development of computer technology and finite element method, large commercial finite element software, such as MARC, ANSYS and ABAQUS, have been used by many scholars to simulate and analyze the hot rolled process, making the rolling information transparent. The simulation and analysis include modeling, defining material, assembling, meshing, setting boundary conditions and extracting internal information of H-beam, making the simulation hard to operate, and meanwhile the hot-rolled forming of H-beam is a non-linear large deformation process, so there is no better solution to solve this problem, and the secondary development for the simulatin and analysisi is proposed in the paper.Response to these problems, the integrated simulation system for hot rolled H-beam with middle-sized is developed in this paper based on ABAQUS and coupled thermal elastic-plastic finite element method by customizing applications and embedding re-meshing algorithm and subroutines, which automatically achieve modeling in pre-processing and extracting simulation results in post-processing, improve the efficiency of optimizing hot rolled parameters and shorten the development cycle of developing new H-beam.Firstly, the simulation of the whole hot rolled process including material nonlinearity, geometric nonlinearity, and boundary nonlinearity is accomplished based on coupled thermal elastic-plastic finite element method and uniaxial compression test of Q235B by embedding material model VUMAT, friction model VFRIC, thermal model FILM, and user-defined field model USDFLD, and meanwhile austenite grain evolution models are embedded in VUMAT and USDFLD to simulate and analyze the microstructure evolution in hot rolled process.Secondly, redrawing the outer contour, remeshing and simulating of the clearance between two passes are accomplished by writting remeshing algorithm in python program and inserting steady-state sentences, which also inherit the temperature field, strain field and austenite grain diameter, completing the continuous simulation of multi-pass hot rolled process, and meanwhile the application program scripts are automatically embedded in the simulation system.Finally, pre-processing and post-processing models of the whole hot rolled process for H-beam are developed based on ABAQUS interface technologies by customizing applications, which can automatically establish models and extract simulation results, and meanwhile the integrated simulation system is constructed by customizing graphical user interface, which achieve interacts between users and simulation system kernel. The simulation system is verified through comparing the temperature field in hot rolled process between simulation results and field data collected by infrared thermometer, and the microstructure evolution and residual stress are also analyzed by this simulation system.The integrated simulation system for hot rolled H-beam with middle-sized developed in this paper has an important significance in optimizing hot rolled parameters and developing new H-beam, and this research method can also be used in other large deformation plastic forming field.