CN-116415348-B - Method for constructing rigidity equivalent model of porous laminated structural member

CN116415348BCN 116415348 BCN116415348 BCN 116415348BCN-116415348-B

Abstract

The invention provides a method for constructing a stiffness equivalent model of a porous laminated structure member, which comprises the steps of S1, obtaining unit cell characteristic dimension parameters of pores on a laminate, S2, constructing a unit cell entity model of the laminate, S3, constructing a unit cell entity finite element analysis model of the laminate, S4, preprocessing the unit cell entity finite element analysis model, S5, calculating stiffness equivalent moduli of the laminate at different temperatures, S6, repeating the steps of S1-S5, calculating the stiffness equivalent moduli of all the laminates in the porous laminated structure member in all directions at different temperatures, and S7, carrying out integrated boundary processing on the stiffness equivalent moduli calculated in the step S6, so as to construct the stiffness equivalent model of the porous laminated structure member. The method can simplify the porous laminated structure member into a non-porous laminated structure model, can well embody the mechanical property of the porous laminated structure member, can greatly improve the calculation efficiency and the calculation precision, and has wide engineering application prospect.

Inventors

JIA LINJIANG
LI XIN
LI LONG
LIU YULIN
WU MIANMIAN
SHI JIAN
CHEN GUANFENG
PAN RONG

Assignees

中国航发四川燃气涡轮研究院

Dates

Publication Date: 20260505
Application Date: 20230224

Claims (6)

1. A method of constructing a stiffness equivalent model of a porous laminated structural member, the porous laminated structural member comprising a plurality of laminates, the method of constructing a stiffness equivalent model of a porous laminated structural member comprising the steps of: s1, acquiring a unit cell characteristic size parameter of a pore on a laminate; S2, building a unit cell physical model of the laminate by using unit cell characteristic dimension parameters; S3, screening the unit cell entity model to construct a unit cell entity finite element analysis model of the laminate; S4, preprocessing loading performance parameters, temperature and constraint on the unit cell entity finite element analysis model, and ensuring the corresponding relation between the material performance parameters and the temperature; S5, calculating the rigidity equivalent modulus of the laminate at different temperatures, wherein the method comprises the steps of S51, extracting stress and strain of each grid unit in each direction in a unit cell entity finite element analysis model at different temperatures, S52, calculating the product of the stress and strain of each grid unit in each direction and the volume of each grid unit, and dividing the total volume of the grid units after summing to obtain the equivalent stress and equivalent strain of the unit cell entity finite element analysis model, S53, and calculating the rigidity equivalent modulus of the laminate based on the equivalent stress and the equivalent strain; s6, repeating the steps S1-S5, and calculating the rigidity equivalent modulus of all laminates in the porous laminated structural member in all directions at different temperatures; And S7, carrying out integrated boundary treatment on the rigidity equivalent modulus calculated in the step S6, and constructing a rigidity equivalent model of the porous laminated structural member.
2. The method for constructing a stiffness equivalent model according to claim 1, wherein in step S1, the method for acquiring the unit cell characteristic dimension parameter of the pores on the laminate comprises: s11, constructing a structural model of the laminate, and determining the pore distribution rule of the laminate according to pore diameters of pores; S12, acquiring the unit cell characteristic size parameters of the pores on the laminate based on the pore distribution rule.
3. The method according to claim 2, wherein in the step S12, the unit cell characteristic dimension parameter includes a pore radius, a lateral distance between two adjacent pores Kong Xinjian, a longitudinal distance between two adjacent pores Kong Xinjian, and a laminate thickness, wherein the two adjacent pores are two pores having the same pore diameter.
4. The method for constructing a rigidity equivalent model according to claim 1, wherein in step S3, when the unit cell solid model is divided into a grid type of tetrahedral grid cells or hexahedral grid cells, and the hole edge positions in the unit cell solid model are divided into a plurality of encrypted portions.
5. The method for constructing a stiffness equivalent model according to claim 1, wherein in step S2, if there are more than or equal to 2 specification unit cell solid models in the laminate, in step S3, the unit cell solid finite element analysis models are constructed by separately networking the specification unit cell solid models, and then the unit cell solid models are combined to form the laminate.
6. The method for constructing a stiffness equivalent model according to claim 1, characterized in that in step S4, the performance parameters are material performance parameters, and the constraints are boundary constraints and load constraints.

Description

Method for constructing rigidity equivalent model of porous laminated structural member Technical Field The invention belongs to the field of aeroengines, relates to a technology for designing a rigidity equivalent model of a porous member, and particularly relates to a method for constructing a rigidity equivalent model of a porous laminated structural member. Background Some components of an aeroengine, such as turbine blades, flame barrels, heat shields, etc., contain a large number of fine holes, the diameter of the holes does not exceed 1mm, and the total area of the holes accounts for more than 50% of the total area of the component. When the conventional finite element analysis is carried out on the components, if the structural characteristics of the pores are reserved, the grid division work is very difficult and time-consuming when the component calculation model is constructed, the number of grids is very large and reaches millions of magnitude, so that the calculation efficiency is low and the real use scene is difficult to simulate, and if the pore structure is not considered, the component calculation model is simplified, but the calculation precision cannot meet the engineering requirement and the real condition of the components in the working state cannot be accurately reflected. In view of this, there is a need for an improvement in the method of constructing a computational model that includes a fine-bore member. Disclosure of Invention In order to solve the problems that when finite element analysis is carried out on a large number of pore members in an aeroengine, a calculation model constructed by the existing method is difficult to simulate a real use scene, the accuracy of a calculation result is low, the reliability is low and the like, the invention discloses a rigidity equivalent model construction method of a porous laminated structure member. The technical scheme for realizing the aim is that the method for constructing the rigidity equivalent model of the porous laminated structural member comprises a plurality of laminates, and comprises the following steps of: s1, acquiring a unit cell characteristic size parameter of a pore on a laminate; S2, building a unit cell physical model of the laminate by using unit cell characteristic dimension parameters; S3, screening the unit cell entity model to construct a unit cell entity finite element analysis model of the laminate; s4, preprocessing loading performance parameters, temperature and constraints on the unit cell entity finite element analysis model; s5, calculating rigidity equivalent modulus of the laminate at different temperatures; s6, repeating the steps S1-S5, and calculating the rigidity equivalent modulus of all laminates in the porous laminated structural member in all directions at different temperatures; And S7, carrying out integrated boundary treatment on the rigidity equivalent modulus calculated in the step S6, and constructing a rigidity equivalent model of the porous laminated structural member. Further, in step S1, the method for obtaining the unit cell characteristic size parameter of the pores on the laminate includes: s11, constructing a structural model of the laminate, and determining the pore distribution rule of the laminate according to pore diameters of pores; S12, acquiring the unit cell characteristic size parameters of the pores on the laminate based on the pore distribution rule. Further, in step S12, the unit cell characteristic dimension parameter includes a pore radius, a lateral distance between two adjacent pores Kong Xinjian, a longitudinal distance between two adjacent pores Kong Xinjian, and a laminate thickness, wherein two adjacent pores are two pores having the same pore diameter. Further, in step S3, when the unit cell solid model is split, the grid type is a tetrahedral grid unit or a hexahedral grid unit, and when the unit cell solid model is split, the hole edge positions in the unit cell solid model are encrypted and divided. Further, in step S2, if there are more than or equal to 2 unit cell solid models in the laminate, in step S3, unit cell solid finite element analysis models are respectively constructed for each unit cell solid model in a network division manner, and then the unit cell solid models of the laminate are formed by combining. Further, in step S4, the performance parameter is a material performance parameter, and the constraint is a boundary constraint and a load constraint. Further, in step S5, the method for calculating stiffness equivalent modulus of the laminate at different temperatures includes: s51, extracting stress and strain of each grid unit in each direction in the unit cell entity finite element analysis model at different temperatures; S52, calculating the product of stress and strain in each direction of each grid cell and the volume of the grid cell, and dividing the total volume of the grid cells after summing to obtain the equivalent stress and equ