Begell House Inc.
Composites: Mechanics, Computations, Applications: An International Journal
CMCA
2152-2057
2
2
2011
NUMERICAL SIMULATION OF TEMPERATURE FIELD AND THERMAL STRESS FIELD IN MoSi2 MULTI-LAYER COATING UNDER THERMAL LOADING
83-94
J. G.
Xu
College of Electromechanical Engineering, Hunan University of Science and Technology, Xiantan 411201, Hunan, China
B. W.
Luo
College of Electromechanical Engineering, Hunan University of Science and Technology, Xiantan 411201, Hunan, China
HuiQiang
Li
College of Electromechanical Engineering, Hunan University of Science and Technology, Xiantan 411201, Hunan, China Hunan University of Science and Technology
With the thermal interface resistances being considered, a two-dimensional FE model for MoSi2 multi-layer coating under thermal loading is developed. With this model the temperature field and thermal stress field of multi-layer coating are obtained and further discussion is performed. The results show that (1) during the heating and cooling processes, higher stress and strain locate at the interfaces, and the peak value locates at the interface between ZrO2 and MoSi2; (2) during both the heating and cooling processes, when a MoSi2 layer DD3-NiCrCoY-ZrO2-MoSi2 is substituted with (80%MoSi2 + 20%ZrO2), the peak value of stress and strain drops gradually; when a new Al2O3 layer is added, namely, DD3-NiCrCoY-ZrO2-Al2O3, the peak value of stress and strain decreases further.
COMPUTER SYNTHESIS AND STATISTICAL ANALYSIS OF THE DISTRIBUTION OF STRUCTURAL CHARACTERISTICS OF GRANULAR COMPOSITE MATERIALS
95-109
M. V.
Radionova
Perm State University, Perm, Russia
V. E.
Vildeman
Perm State Technical University, Perm, Russian Federation
A. V.
Ilinykh
Perm State Technical University, Perm, Russian Federation
An algorithm of computer modeling of the microstructure of granular composite materials is presented. The results of computer synthesis of the microstructures of granular composites with a different number of structural elements (grains) are given. The microstructures obtained differ from one another by average sizes of grains and by their distribution law. Using the shear-scale invariant criterion, the laws of the size distribution of grains have been tested. The strength of the criterion at different alternatives is analyzed by the method of statistical modeling. A comparative analysis of this criterion with the Kolmogorov-Smirnov ones and with the chi-square criterion is given. The results of numerical simulation of the processes of deformation and destruction of granular composites are presented.
APPLICATION OF THE MODEL OF DEFORMATION OF POROUS MATERIALS TO CALCULATION OF EFFECTIVE ELASTICITY MODULI OF GRANULAR COMPOSITES
111-129
A. F.
Fedotov
Samara State Aerospace university, Samara, Russian Federation
A method that is based on the model of elastic deformation of porous materials is suggested for calculation of effective elasticity moduli of granular composites. A distinctive feature of the method is the averaging of microscopic stresses and deformations over the effective volume of phases rather than over the total volume of phases. The computational dependences of effective volumes of averaging on the elasticity moduli and volume fraction of phases are obtained. The results of calculation are compared with the experimental data at different combinations of elasticity moduli and an arbitrary volume concentration of phases.
ELASTOPLASTIC DEFORMATION OF DISPERSE COMPOSITES WITH A RAREFIED RANDOM STRUCTURE
131-146
N. V.
Mikhailova
Perm State Technical University, Perm, Russian Federation
A. A.
Tashkinov
Perm State Technical University, Perm, Russian Federation
Random field of structural strains and stresses in the problems of elastoplastic deformation of matrix composites with spherical and elliptical inclusions are studied.
The elastoplastic boundary-value problem for structurally heterogeneous media is considered with account for a real form of moment functions of structural parameters. The problem solution is found in integro-differential equations by the method of Green functions in the complete correlation approximation. The method of statistical averaging of the system of equations of elastoplastic isotropic composite material equilibrium is used. The elastoplastic boundary-value problem is solved by numerical integration. Approximations of moment functions of the structural properties of second and third orders are used in calculation of moments of stress and strain fields.
MODELING OF THERMOMECHANICAL PROCESSES IN COMPOSITE SHELLS IN LOCAL RADIATION HEATING
147-169
E. K.
Syzdykov
I. Ya. Bereznyak Public Joint-Stock Company "State Mechanical Engineering Design Bureau "Raduga", Dubna, Moscow Region, Russian Federation
V. V.
Minin
N. E. Bauman Moscow State Technical University, Moscow, Russian Federation
Yu. I.
Dimitrienko
Computational Mathematics and Mathematical Physics Department, Bauman Moscow State Technical University, 2-nd Baumanskaya Str., 5, Moscow, 105005, Russia
A model of thermomechanical processes of composite thin-walled shells at high temperatures with account for thermodestruction effects has been developed. The model allows for interlayer and transverse stresses in the shell and variation of composite properties in heating.
A numerical method has been developed for solution of problems of internal heat and mass transfer and thermomechanics of composite thermodestructing shells. The method is based on the finite element method for the problem of the theory of shells and the finite-difference method for the system of equations of internal heat and mass transfer.