Study Of Thermal Stress Distribution On Thick Wall Cylinder By Thermal Shock Treatment

Super-high pressure tubular reactor is one of the most important equipments in the production process of polyethylene. Whether or not does it work safe and reliably is directly related to the output values and profit, even the workers' life. The explosive decomposability of ethylene will lead to much large temperature gradient and great range thermal stresses response on thick wall of reactor. Stress analysis by thermal shock is an actual problem needed to solve urgently in the reactor safety engineering.Thermal shock problem is always one of the most concerned questions in Solid mechanics theory field. Based on the real engineering problem, this paper tries to investigate its stress response and temperature response when the thick wall cylinder endures thermal punch; gives out the basic thermal-elastic mechanics equation and heat-conduction equation. By introducing function # in boundary conditions, the precise solution of temperature field is found by Laplace transform. And basing it quasi-static thermal stress distribution is found. In the other hand, coupling term is taken into account in heat-conduction equation; then joining with kinematics equation, coupling thermal stress field is found.Enduring thermal shock treatment, temperature distribution and thermal stress distribution varies with dimensions of cylinder wall regularly, and declines with time. At the moment of thermal shock, the value of temperature and stress is finite, the shock energy have a great influence in it. This paper discusses the thermal stress change with time, study on the relationship between stress and radium. It provides a theoretical reference to study on the decrease the fatigue damage of the reactor under thermal punch.