In order to search the effect of thermal expansion stress and temperature difference stress on BOF shell, according to thermal elastic and plastic theory, and using FEM as well as considering the physical constant change of lining and shell with the temperature and the joint between lining and shell, the thermal expansion stress, the temperature difference stress and the composite thermalstress of shell were got by computational mechanics method in thermalload.
This paper is an overview of the development of prediction and control of welding deformation. Some theories and methods used in the prediction are introduced, including thermal-elasto-plastic theory, finite element analysis (FEA) accounting for phase transformation and other coupled processes, elastic visco-plastic FEA, method of inherent strain, similitude theory and artificial neural net work.
Thereby according to thermoelastic-plastic theory, using incremental variational stiffness method, a finite element program with quadrilateral 8-rodes isoparametric element is programed, and the thermal stress as well as residual stress of the cylinder haed after shutdown is computed by applying this program.
In this paper, by use of FEM and thermoplastic theory, combined with martensite phase transformation dynamic equation, temperature field, tissue and stress fields of 22CrMo steel cylinder sample in quenching are numeric simulated. Stress of sample face and center parts in quenching and the effect of martensite transformation on quenching stress are simulated specially.