Research On Thermomechanical Stress Of Ladle Composite Structure Body And Its Life Prediction

Ladle is an importance equipment of metallurgy industry; its life directly influences the economic efficiency of iron and steel enterprises. Ladle thermomechanical stress calculation and its impact rule analysis have important meanings for its design and use, while predicting ladle life can maintain it in time and improve its life.This paper mainly does the following researches with the object of ladle composite construction body.(1)This paper puts forward the concept of ladle composite construction body, and establishs the model of ladle composite construction body with finite element software based on the theory of transferring heating subject, and calculates its transient and stable temperature and stress field of each case under cases of preheating and working states, as is advantageous to analyze stress distribution of ladle shell and linings and correlation between them.(2)This paper obtains by analyzing the impact on stress field of ladle lining expansion seams: setting 2 millimeters expansion seam can reduce the contact stress which takes up from 1/6 to 1/5 of lining resistance pressure intensity. The research also indicates: ladle shell temperature and stress both increase with thickness minishing of ladle wall working lining.(3)This paper puts forward the life predicting model of ladle shell and liings with the theory of fracture and hot shock damage, calculating results basically being consistent with its actual life with the model.The research work of this paper plays a certain reference role for understanding ladle temperature and stress field distribution, choosing proper refractory materials and expansion seams, and predicting ladle life span.