Finite element analysis method of curved stiffened plate in high-temperature environment

Abstract

The invention discloses a finite element analysis method of a curved stiffened plate in a high-temperature environment. The method comprises that following steps of: obtaining a plate stiffness matrixthrough considering the influence of temperature change on materials and combining a DST-BK plate element theory; obtaining a rib element stiffness matrix and a rib element mass matrix after rib plate displacement coordination at interfacial surfaces of rib plates according to rib plate displacement coupling conditions; applying a uniform temperature field which is equivalent to thermal load to the plates and carrying out static analysis to obtain a plate additional thermal stress stiffness matrix considering thermal stress and derive a rib additional thermal stress stiffness matrix; carryingout eigenvalue analysis on a global structure stiffness matrix and a global additional thermal stiffness matrix to obtain a buckling critical temperature; superimposing the global structure stiffnessmatrix and the additional thermal stress stiffness matrix to obtain a curved stiffened plate stiffness matrix considering the influence of the temperature on material properties and the influence ofadditional thermal stress; and carrying out eigenvalue analysis on a global mass matrix to obtain the dynamic characteristics of curved stiffened plates in a uniform-temperature environment.

Description

technical field [0001] The invention relates to a finite element analysis method for a curved stiffened plate in a high temperature environment, and belongs to the field of structural modeling and analysis of a stiffened plate. Background technique [0002] A stiffened panel is a structural component composed of a base structure and stiffeners connected by a certain way of laying. Because it has the advantages of easy processing, high specific strength, strong bearing capacity, etc., and can increase the critical pressure of structural buckling failure under the premise of the same weight, the stiffened plate has become one of the main structural forms of industrial pressure-resistant structures. Traditionally stiffened slabs usually adopt straight-line stiffening, laid horizontally, vertically or at a certain angle. The linear form cannot improve the utilization rate of materials and is not convenient for optimal design. [0003] The thermal environment will change the me...

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the defects that the traditional finite element software requires overlapping joints of stiffened plates, which leads to low modeling efficiency, and the existing modeling methods cannot realize the common use of thick and thin plates, the present invention provides a finite element analysis method for curved stiffened plates in high temperature environment, This method can realize the general analysis of curved thick and thin plates, and can realize the arbitrary arrangement of ribs in the plate, and can improve the overall rigidity of the structure by adjusting the curvature of the ribs and the laying position

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