CN105574306A - Method for obtaining theoretical strain in strength finite element analysis - Google Patents
Method for obtaining theoretical strain in strength finite element analysis Download PDFInfo
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- CN105574306A CN105574306A CN201410535565.XA CN201410535565A CN105574306A CN 105574306 A CN105574306 A CN 105574306A CN 201410535565 A CN201410535565 A CN 201410535565A CN 105574306 A CN105574306 A CN 105574306A
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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
The invention belongs to Strength Finite Element Analysis and verification experimental verification field, relate to a kind of method obtaining theoretical strain in Strength Finite Element Analysis.
Background technology
In intensive analysis, Finite Element Method uses more and more extensive, and strength test and finite element analysis are verified more prevalent mutually, usually need to be measured by the strain of strain transducer to given position in testpieces and direction in strength test; Judged the correctness of finite element analysis or test by the difference of the strain in correspondence position and direction in the strain of contrast test part and finite element analysis, therefore in finite element analysis, the acquisition of the strain in correspondence position and direction just seems particularly important.
Needed the following steps when obtaining given position and direction strain in finite element analysis: first according to analysis result, strain transducer position and direction in test are determined in the past, according to strain transducer position and direction in test, finite element model is split again, then according to strain transducer direction, local coordinate system is set up to the region be partitioned into, and by the region be partitioned into set up state coordinate system under give direction, then solve by normal step, last reading under each is partitioned into coordinate system corresponding to region strains, this strain is the theory strain at strain transducer place in testpieces.
The triviality of said method is: need to carry out repeated segmentation to Complex Situation testpieces, repeatedly define coordinate system, and repeatedly to being partitioned into imparting direction, region, the strain of certain position also will be read under its respective coordinates system.
Summary of the invention
The object of the invention is: the method obtaining theoretical strain is provided in a kind of Strength Finite Element Analysis
Technical scheme of the present invention is: a kind of method obtaining theoretical strain in Strength Finite Element Analysis, comprises the following steps:
Step one: according to Finite Element Principle and strain transducer measuring principle, set up addition rod unit according to given optional position and direction in the finite element model of testpieces;
Step 2: for making addition rod unit not affect local structural stress and Strain Distribution characteristic, need define the bar unit local stiffness characteristics of stiffness characteristics opposed configuration infinitely small;
Step 3: directly read the strain of bar unit in the result after analysis and solution, this strains as the theory strain under given optional position and direction.
Advantage of the present invention is: the inventive method uses addition rod unit simulated strain sensor,---segmentation zoning---is set up local coordinate system and---is given material direction---analysis and solution---under local coordinate system, read theoretical strain to compare step in the past: set up finite element model, enormously simplify the obtaining step of theoretical strain, principle is simple and clear, is easy to operation.
Accompanying drawing explanation
Fig. 1 is testpieces finite element model local area network trrellis diagram;
Fig. 2 is the finite element model local area network trrellis diagram after testpieces with the addition of bar unit;
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details, refers to Fig. 1 to Fig. 2.
As shown in Figure 1, be testpieces finite element model local area network trrellis diagram;
As shown in Figure 2, in the finite element model of testpieces, set up addition rod unit according to given optional position and direction, be numbered No. 1 ~ No. 15;
Obtain a method for theoretical strain in Strength Finite Element Analysis, comprise the following steps:
Step one: according to Finite Element Principle and strain transducer measuring principle, set up addition rod unit according to given optional position and direction in the finite element model of testpieces;
Step 2: the local stiffness characteristics of definition bar unit stiffness characteristics opposed configuration is infinitely small;
Step 3: directly read the strain of bar unit in the result after analysis and solution, this strains as the theory strain under given optional position and direction.
Advantage of the present invention is: the inventive method uses addition rod unit simulated strain sensor,---segmentation zoning---is set up local coordinate system and---is given material direction---analysis and solution---under local coordinate system, read theoretical strain to compare step in the past: set up finite element model, enormously simplify the obtaining step of theoretical strain, principle is simple and clear, is easy to operation.
Claims (2)
1. in Strength Finite Element Analysis, obtain a method for theoretical strain, it is characterized in that, comprise the following steps:
(1) according to Finite Element Principle and strain transducer measuring principle, in the finite element model of testpieces, addition rod unit is set up according to given optional position and direction;
(2) for making addition rod unit not affect local structural stress and Strain Distribution characteristic, the bar unit local stiffness characteristics of stiffness characteristics opposed configuration need be defined infinitely small;
(3) directly read the strain of bar unit in the result after analysis and solution, this strains as the theory strain under given optional position and direction.
2. the method obtaining theoretical strain in Strength Finite Element Analysis according to claim 1, it is characterized in that, set up addition rod unit in step 1 to be specially: two nodes of strain transducer axis are chosen in optional position given in the finite element model of testpieces and direction, utilize these two nodes to set up bar unit.
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| CN201410535565.XA CN105574306A (en) | 2014-10-11 | 2014-10-11 | Method for obtaining theoretical strain in strength finite element analysis |
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| CN201410535565.XA CN105574306A (en) | 2014-10-11 | 2014-10-11 | Method for obtaining theoretical strain in strength finite element analysis |
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| CN105574306A true CN105574306A (en) | 2016-05-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105930616A (en) * | 2016-05-16 | 2016-09-07 | 中国航空工业集团公司西安飞机设计研究所 | Load distribution method for statically indeterminate structure of dynamic wing surface of aircraft |
| CN108052740A (en) * | 2017-12-13 | 2018-05-18 | 中国飞机强度研究所 | A kind of corresponding finite element unit screening technique of foil gauge |
| CN111177848A (en) * | 2019-12-26 | 2020-05-19 | 中国航空工业集团公司西安飞机设计研究所 | Method and device for acquiring strain theoretical value based on finite element model |
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| CN101582095A (en) * | 2009-06-19 | 2009-11-18 | 东南大学 | Non-linear dynamic finite element method for determining cable-strut system static balancing state |
| CN103279611A (en) * | 2013-05-29 | 2013-09-04 | 东南大学 | Method for optimized arrangement of strain sensor |
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2014
- 2014-10-11 CN CN201410535565.XA patent/CN105574306A/en active Pending
Patent Citations (2)
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| CN101582095A (en) * | 2009-06-19 | 2009-11-18 | 东南大学 | Non-linear dynamic finite element method for determining cable-strut system static balancing state |
| CN103279611A (en) * | 2013-05-29 | 2013-09-04 | 东南大学 | Method for optimized arrangement of strain sensor |
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| 刘旺玉等: "基于特征的实用性有限元模型化知识系统", 《机械强度》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105930616A (en) * | 2016-05-16 | 2016-09-07 | 中国航空工业集团公司西安飞机设计研究所 | Load distribution method for statically indeterminate structure of dynamic wing surface of aircraft |
| CN105930616B (en) * | 2016-05-16 | 2019-09-06 | 中国航空工业集团公司西安飞机设计研究所 | A kind of aircraft moves the load distribution method of aerofoil statically indeterminate structure |
| CN108052740A (en) * | 2017-12-13 | 2018-05-18 | 中国飞机强度研究所 | A kind of corresponding finite element unit screening technique of foil gauge |
| CN111177848A (en) * | 2019-12-26 | 2020-05-19 | 中国航空工业集团公司西安飞机设计研究所 | Method and device for acquiring strain theoretical value based on finite element model |
| CN111177848B (en) * | 2019-12-26 | 2023-05-23 | 中国航空工业集团公司西安飞机设计研究所 | Method and device for acquiring strain theoretical value based on finite element model |
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Application publication date: 20160511 |
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