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Method for obtaining theoretical strain in strength finite element analysis

A theoretical strain and finite element technology, applied in special data processing applications, electrical digital data processing, instruments, etc., to achieve the effects of simplified acquisition steps, simple and clear principles, and easy operation

Inactive Publication Date: 2016-05-11
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology

[0004] The cumbersomeness of the above method lies in that it is necessary to divide the test piece in a complex situation multiple times, define the coordinate system multiple times, and assign directions to the segmented area multiple times, and the strain at a certain position must be read in its corresponding coordinate system

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  • Method for obtaining theoretical strain in strength finite element analysis
  • Method for obtaining theoretical strain in strength finite element analysis

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Embodiment Construction

[0013] The present invention will be further described in detail below in conjunction with the drawings, please refer to Figure 1 to Figure 2 .

[0014] Such as figure 1 Shown is the partial mesh diagram of the finite element model of the test piece;

[0015] Such as figure 2 As shown, in the finite element model of the test piece, an additional rod element is established according to a given arbitrary position and direction, numbered from 1 to 15;

[0016] A method for obtaining theoretical strain in strength finite element analysis, including the following steps:

[0017] Step 1: According to the finite element principle and the principle of strain sensor measurement, an additional rod element is established in the finite element model of the test piece according to the given arbitrary position and direction;

[0018] Step 2: Define the stiffness characteristics of the rod element to be infinitely small relative to the local stiffness characteristics of the structure;

[0019] Step ...

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Abstract

The invention provides a method for obtaining theoretical strain in strength finite element analysis. The method is characterized by comprising the following steps: (1) according to a finite element principle and a strain sensor measurement principle, establishing an additional bar element according to any given position and direction in the finite element model of a test specimen; (2) in order to prevent the additional bar element from affecting local structural stress and strain distribution characteristics, requiring to define that bar element stiffness characteristics are infinitesimal relative to the local structural stiffness characteristics; and (3) after analysis and solution are carried out, directly reading bar element strain in a result, wherein the strain is theoretical strain under any given position and direction.

Description

Technical field [0001] The invention belongs to the field of strength finite element analysis and test verification, and relates to a method for obtaining theoretical strain in strength finite element analysis. Background technique [0002] The use of finite element method in strength analysis is more and more extensive and in-depth, and mutual verification between strength test and finite element analysis is becoming more and more common. In strength test, it is usually necessary to measure the strain in a given position and direction in the test piece through a strain sensor; The difference between the strain of the test piece and the strain in the corresponding position and direction in the finite element analysis is used to judge the correctness of the finite element analysis or test. Therefore, it is particularly important to obtain the strain in the corresponding position and direction in the finite element analysis. [0003] In the past, the following steps were required to ...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 鬲钰焯范瑞娟
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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