Basic By Finite Element Analysis Of Roll Fatigue Fracture Simulation

Roll is the most direct tool of realizing the metal in the process of rolling deformation,both CRS (Cold Rolled Steel) and HRS (hot rolled steel), will under the pressure ofthermal stress and mechanical stress, especially for shaped roll. In the rolling process,broken roller accident is frequent occurrences. If the early rolling scrap causes productiondowntime, lower yields and equipment maintaining facilities increasing is to be considered,the cost will be a bigger part. So, the testing for the fatigue property and fractureexperiments on roll with crack will help to reduce production costs and extended operatinglife, and it eagers to get the solution for Heavy Steel Rolling Mill.By ANSYS/LS-DYNA, rolling with surface axial crack of rolling process modelingand dynamics simulation is the fist step., and the changing of rule about stress intensityfactoring crack tip area of roll with surface axial crack is calculated, and based on it theintegral of J is calculated. Analysis from the finite element numerical simulation and thedata also be obtained, getting the service life of the hot rolling work roll. Finally,calculated that the crack expansion leading to the failure of hot rolling work rollThrough the simulation, we know that work roll in the process of operation，Cracktip node from axial stress state has changed greatly. The third principal stress contactedwith Back-up roll will be the most important reason r than contacting with rolled piececontact. Crack tip node from axial generation third principal stress state will be the mainfactors of influence crack development. In a week of work roll finish in the process withrolled piece, the hoop stress of thermal stress was not large amplitude change.Analysis bycomprehensive rolling force and thermal stress, roll with surface axial crack in rollingprocess, when Crack part contacts with supporting rollers, crack tip node from axial stressis the biggest place.If the stress value higher than the compressive strength of the limit,will cause plastic deformation,it is more easy to cause the crack propagation along theaxial, it’ll be one of the important factors on roll service life.There has the study summarized the end, getting referenced value conclusion, andpoints out some of problems to be solved about further research on roll. In addition, thethesis is a try that application together by the finite element method, fracture mechanics,damage mechanics, and other modern strength theory analysis and design rolling.