Research On The Thermal Buckling And Thermoelastic Of Functionally Graded Plates And Shells

Due to high speed in the atmosphere,boost glide tactical missile will face with serious air heating problems.The boundary layer of the thermal structure of traditional ablative materials is not uniform.In higher temperature,each layer expansion degree of inconsistent will lead to serious thermal stress problem.Functional graded material changes in the space continuously,so that the physical properties of the gradient change.This new type of composite material eliminates the traditional interface,and alleviate the problem of thermal stress effectively.The advantages of composite materials will be made use of efficient.In recent years,the mechanical study of functionally graded materials has made important progress,but numerical simulation model of functionally graded structure still needs a breakthrough in practice.This article has established functionally graded material physical models.The structure is divided into a number of layers,and physical parameters of each layer change according to the correlation functions along the thickness direction.Physical model of functional graded materials is analyzed and simplified.Analytic method and numerical simulation is combined to establish functionally graded thermal elastic analysis model,and results were compared to the literature to verify the feasibility of the model.The critical thermal buckling analysis of functionally graded plates and shells is carried out.By changing the relative geometrical size of the functionally graded plates and cylindrical shells,its influence on the critical thermal buckling temperature is researched.After thermo-dynamic finite element numerical simulation of functionally graded structure,steady-state thermal stress distribution of plates and transient thermal stress distribution of cylindrical shell and its influencing factors were analyzed.In addition,the influence of the thermal parameters of temperature dependence of functional graded material on the critical temperature and thermal stress distribution were analyzed.Related research results show that the functionally graded shell structure thermal buckling critical temperature varies with the relative geometry size changing.Function graded structure temperature field and the thermal stress distribution vary according to the changing of the material non-homogeneity parameter and correlation functions.In the analysis of thermal elastic problem of functionally graded structure,the material thermal physical parameters with temperature dependence should be considered,otherwise it will lead to critical temperature rise is overvalued and thermal stress value is under estimated.