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Overall Multilayered high-pressure vessel stress state

Author: ZhangYuXiang
Tutor: SongPengYun
School: Kunming University of Science and Technology
Course: Chemical Process Equipment
Keywords: High pressure vessel Overall Multilayered Stress state Theoretical analysis Numerical Simulation
CLC: TH49
Type: Master's thesis
Year: 2009
Downloads: 89
Quote: 1
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Abstract

The high-pressure container of the overall multi-layer bandaging is a non-heavy weld Multilayered high-pressure container. It is the inner tube first spliced ??to the desired length, the ends can be welded to the upper flange or head, and then laminate layer by layer in the entire length of the bandage. After the full-length wrap up and welded, polished and then bandaged second layer bandage straight to the desired thickness. This method when dressing girth weld of the layers can be staggered, and the Laminates longitudinal weld is also shifted by a certain angle to each other. Container without deep girth weld, has the advantage of only drain does not burst, has been widely recognized in recent years, continues to expand its applications. Widely used in petroleum, chemical, metallurgical and other industries, such as ammonia separator ammonia plant, ammonia, urea synthesis tower. High-pressure container of the overall multi-layer bandaging as static pressure bearing device, when the stress state of perfect contact between the assumptions layer study has revealed many important characteristics and laws, and provides a theoretical basis for the design, production and use of these types of containers. The container layer between the gap and stress state under dynamic loads is not deep enough, and the overall multi-layer bandaging the stress state of the end of the high pressure vessel has not been a detailed analysis. High pressure vessel stress state of the overall multi-layer bandaging system and in-depth research for class container's strength, optimize the design and safe use of great significance. This paper focuses on the static and dynamic pressure loads under the overall multilayer bandage stress state in the gap between the container cylinder layer theoretical analysis and numerical calculation, and the overall multi-layer bandaging the the container cylinder and spherical head connection area stress The state of numerical analysis. Research work and conclusions are as follows: (1) cylinder theoretical study of the stress state. Assumptions based on the theory of elasticity, analyzed and summarized the different end conditions when there is a uniform gap between the lower hydrostatic pressure stress state Multilayered container cylinder, there is a uniform gap between the dynamic pressure lower cylinder stress analysis The state of stress or no gap between the formula and the different loads lower. The theoretical analysis shows that: the inner pressure under the action of the container wall stress is increased with the increase of the inter-layer clearances. Uneven gap between the layers, in accordance with the amount of deformation of equivalence principle uneven gap is equivalent to the uniform gap, and equivalent stress value of the front and rear inner wall of a comparative analysis, indicating that the equivalent calculation method is feasible. A two-tier container, for example, by calculation of the stress distribution uniform gap and non-uniform gap, the results showed that: non-uniform gap is equivalent to the inner wall stress and non-uniform gap uniform gap average strain calculated stress values ??or compared to the stress value obtained by the finite element method, the value is small, but the error is small. (2) The cylinder stress state numerical simulation. For away from the ends of the cylindrical part of the application of ANSYS contact elements to establish the overall multi-layer bandaging high pressure vessel analysis model of the stress state of the cylinder, simulated static pressure, dynamic pressure with or without gaps between the different loads and layer under the stress state of the cylinder. In contrast to the results of the analytical theory and the numerical solution coincides with the analytical solution, indicating that the interlayer contact the rationality of the model analysis. (3) the ends of the connection area numerical simulation of the stress state. On the basis of the analysis of the gap between the cylinder layer contact model, the finite element analysis model of the the multilayer cylinder and spherical head connection area. The multilayer cylinder using the interlayer contact model of the connection head, the spherical head for the overall model to obtain the end portion of the stress distribution state of the connection structure of the stepped. And the stress distribution of a non-multilayer structure of the same size were compared. The results show that the two structures the inner and outer wall stress similar trend, a significant stress concentration occurs in the connecting area, is connected at the maximum axial stress value is greater than the maximum circumferential stress, but rapid decay in the maximum stress value is reached. Strength assessed using the finite element analysis results show that multi-layer cylinder and spherical head connection area ladder structure of sufficient strength.

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