Research On Residual Stress Of Plate Oxygen Cutting Based On Numerical Simulation And Experiment

Improving manufacturing quality, reduce the production costs and decreasing labor productivity are inevitable results and requests of the development of shipbuilding economic. It is an important method for advancing quality to improve shipbuilding processes. Researching deeply of the stress problem and analyzing the scientifically in shipbuilding from the mechanical point are to providing a theoretical basis and technical support for discovering the problem of ship construction process and identifying improvement measures.Oxygen cutting is widely used in the edge forming of the steel plates and cutting holes of shipbuilding processes. To ensure the safety and reliability of cutting elements, it has important theoretical and engineering significance to inference accurately of mechanical behavior during cutting process. This paper aims at providing a theoretical basis for improving the cutting process and reducing the residual stress of cutting by researching the distribution of residual stress field of the oxygen cutting and experimental verification.Firstly, this paper does numerical simulation of the line and circle oxygen cutting process using finite element software, and studies convention coefficient and dual heat source model, mobile heat source treatment in cutting process, "life and death" element and so on, analyzes the temperature field of cutting and the thermal cycle curve. The size and distribution of residual stress in oxygen cutting process are obtained finally.Secondly, in order to validate the reliability and accuracy of the finite element simulation results, and to determine the thermal efficiency of Gauss heat source, this paper does oxygen cutting experiments of steel plates using non-contact infrared temperature measurement and the measurement of the indentation residual strain method. The comparative analysis of the numerical simulation results and the experimental results indicate that they are consistent.Finally, this paper does sensitivity analysis for different parameters of cutting process. Study the impact to cutting process of the length of the cutting model, the model boundary conditions, cutting speed, and so on. The variation laws of temperature field and residual stress field is summarized with several common factors.