CN109726435A - A kind of method of connector nail group's LOAD FOR - Google Patents
A kind of method of connector nail group's LOAD FOR Download PDFInfo
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- CN109726435A CN109726435A CN201811469906.2A CN201811469906A CN109726435A CN 109726435 A CN109726435 A CN 109726435A CN 201811469906 A CN201811469906 A CN 201811469906A CN 109726435 A CN109726435 A CN 109726435A
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Abstract
The invention belongs to strength of aircraft experimental technique fields, and in particular to a kind of method of connector nail group's LOAD FOR.This method thinking is simple, clear, and the nail that can accurately calculate jointing nail group carries and connector stress.Compared to traditional modeling method, this method simulates the practical stiffness of connected nail by establishing short beam member, and it is high that the nail acquired carries accuracy；Connector is connect to simulate practical connection relationship by this method by short beam member with hardware body, so that constraint is so excessively firm unlike conventional method, calculated result is more acurrate.
Description
Technical field
The invention belongs to strength of aircraft experimental technique fields, and in particular to a kind of method of connector nail group's LOAD FOR.
Background technique
Strength of aircraft calculates center tap and the connection of hardware body calculates the problem of often nail group's load distribution calculates, nail
Group's load distribution calculating is a high order statically indeterminate problem, is unable to get standard for complicated and irregular connector engineering calculation
True result.Finite element method is widely used to calculate joint detail in everybody in engineering design at present, and general way is by connector
Establish solid element detail model, the direct fixed constraint in nail hole position.This method is unable to the rigidity of accurate simulation connected nail, constraint
It is excessively firm, real border condition can not be simulated.
The method that traditional immediate constraint nail hole position butt joint carries out detail model calculating can not accurate simulation connected nail
Rigidity, and the coupling stiffness of the butt joint of immediate constraint nail hole and hardware body simulation it is excessively firm, do not meet practical structures
Connect flexibility, the connected nail load and connector stress being calculated are not accurate enough, firm constraint often make calculated result compared with
It is conservative.
Summary of the invention
Goal of the invention: by local refinement hardware body model and in connected nail position cloth node, using short beam member come mould
The detail model of connector and hardware body are attached to calculate connector stress and connected nail load by quasi- connected nail, both can be quasi-
Really simulation connected nail rigidity, and the rigidity that connector is connect with ontology can be provided by practical structures, avoid immediate constraint nail hole position
Set carry out the calculating of connector detail model constraint it is excessively firm and the shortcomings that connected nail rigidity can not be simulated.
Technical solution: a kind of method of connector nail group's LOAD FOR, the method steps are as follows:
Initially set up finite element analysis model, method for building up are as follows: 1), butt joint itself according to practical structures carry out nail hole cloth
It sets, then establishes the 3D solid unit finite element model of connector, nail hole center arrangement node A will be on node A and Connector Model
A circle node around nail hole establishes rigid-body system；2), the partial model local refinement that will be connect with connector is correspondingly connected with the position of nail
Set arrangement node B；3), node A is connect to foundation nail member with B；4) load is applied to component according to actual loading conditions, according to reality
Border connection applies constraint at connector earhole；
It submits analysis software to calculate the finite element analysis model of foundation later, reads calculated result after the completion of calculating
The unit power of middle nail member is the load of connected nail, realizes the purpose of connector nail group's LOAD FOR.
Further, the analysis software is NASTRAN software.
Further, the foundation of finite element analysis model uses PATRAN software.
Further, member is followed closely in finite element analysis model method for building up and simulates nail member using short beam member, and nail meta-attribute is pressed
It is provided according to the material and rigidity of connected nail.
Advantageous effects: this method thinking is simple, clear, and the nail that can accurately calculate jointing nail group carries and connector is answered
Power.Compared to traditional modeling method, this method simulates the practical stiffness of connected nail by establishing short beam member, and the nail acquired carries accurate
Degree is high；Connector is connect to simulate practical connection relationship by this method by short beam member with hardware body, so that constraint is unlike tradition
Method is so excessively firm, and calculated result is more acurrate.
Detailed description of the invention
Fig. 1 structural schematic diagram,
Fig. 2 follows closely first link model rough schematic view,
Fig. 3 connector detail model schematic diagram,
The schematic diagram of Fig. 4 connector detail model built in items ontology.
Specific embodiment
A kind of method of connector nail group's LOAD FOR, this method use under the PATRAN/NASTRAN software of MSC company,
The specific implementation steps are as follows: initially setting up finite element analysis model, method for building up are as follows: a, butt joint itself according to practical structures into
Row nail hole arrangement, then establishes the 3D solid unit finite element model of connector, nail hole center arrangement node A, by node A with connect
A circle node on head model around nail hole establishes rigid-body system；B, the partial model local refinement that will be connect with connector, it is corresponding to connect
Meet the location arrangements node B of nail；C, node A is connect to foundation nail member with B；In this implementation, nail member simulates nail using short beam member
Member, nail meta-attribute are provided according to the material and rigidity of connected nail.Most connected nail is all double shear nail in practical structures, that is, is connected
Element there are three, connected multiple elements are assumed in finite element to constitute nail between every two element first, two
Nail member is mutually indepedent, and then the same bolt becomes two nail members independent of each other in simplified model；It is integrally connect with certain component
For the in-and-out bolt that connect with upper and lower covering of head, connected nail member rough schematic view is provided, structural schematic diagram as shown in Figure 1,
In-and-out bolt is connected on covering (2) under metal joint flange (1), spoiler, spoiler full-height honeycomb core (3) and spoiler
Covering (4)；Covering (6), spoiler full-height bee under metal joint flange (5), spoiler in attached model schematic shown in Fig. 2
The finite element element of covering (8) and in-and-out bolt (9) on nest core (7) and spoiler；D, component is applied according to actual loading conditions
Lotus is loaded, applies constraint at connector earhole according to practical connection；It is constrained to forced displacement, i.e., from component overall stress point
The displacement that connector earhole center is extracted in analysis is then applied on the finite element model of this method foundation.With plane spoiler
For, metal joint detail model by follow closely member connect with hardware body after finite element model as shown in figure 3, model is constrained to
Displacement is forced, i.e., the displacement that 4 hitch points and manipulation point are picked out from the analysis of spoiler overall stress is applied to detail analysis
Model.
Submit analysis software to carry out operation the finite element analysis model of foundation later, the analysis software that this method uses for
The NASTRAN software of MSC company reads after the completion of calculating and follows closely the load that first unit power is connected nail in calculated result, real
The purpose of existing connector nail group's LOAD FOR.
Most connected nail is all double shear nail in practical structures, i.e., there are three connected elements, being connected in finite element
The multiple elements connect assume and constitute a nail member between every two element, and two nail members are mutually indepedent, then the same bolt
Become two nail members independent of each other in simplified model；After the detail model of metal joint is connect by nail member with hardware body
Finite element model as shown in Figure 2 (by taking certain plane spoiler as an example), model is constrained to forced displacement, i.e., totally answers from spoiler
The displacement that four hitch points and manipulation point are picked out in power analysis is applied to detail analysis model.
Claims (4)
1. a kind of method of connector nail group's LOAD FOR, which is characterized in that steps are as follows:
Initially set up finite element analysis model, method for building up are as follows: 1), butt joint itself according to practical structures carry out nail hole arrangement,
Then the 3D solid unit finite element model of connector is established, nail hole center arrangement node A will be followed closely on node A and Connector Model
A circle node around hole establishes rigid-body system；2), the partial model local refinement that will be connect with connector is correspondingly connected with the position of nail
Arrange node B；3), node A is connect to foundation nail member with B；4) load is applied to component according to actual loading conditions, according to reality
Connection applies constraint at connector earhole；
It submits analysis software to calculate the finite element analysis model of foundation later, reads in calculated result and follow closely after the completion of calculating
The unit power of member is the load of connected nail, realizes the purpose of connector nail group's LOAD FOR.
2. a kind of method of connector nail group's LOAD FOR according to claim 1, which is characterized in that the analysis software is
NASTRAN software.
3. a kind of method of connector nail group's LOAD FOR according to claim 1, which is characterized in that finite element analysis model
Foundation use PATRAN software.
4. a kind of method of connector nail group's LOAD FOR according to claim 1, which is characterized in that finite element analysis model
Member is followed closely in method for building up and simulates nail member using short beam member, and nail meta-attribute is provided according to the material and rigidity of connected nail.
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| CN201811469906.2A CN109726435B (en) | 2018-12-04 | 2018-12-04 | Method for calculating load of joint nail group |
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| CN201811469906.2A CN109726435B (en) | 2018-12-04 | 2018-12-04 | Method for calculating load of joint nail group |
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| CN109726435A true CN109726435A (en) | 2019-05-07 |
| CN109726435B CN109726435B (en) | 2022-11-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111159879A (en) * | 2019-12-25 | 2020-05-15 | 中国航空工业集团公司西安飞机设计研究所 | Nail load processing method of centralized load transmission structure |
| CN112231864A (en) * | 2020-11-16 | 2021-01-15 | 西北工业大学 | Composite material nail load rapid analysis system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111159879A (en) * | 2019-12-25 | 2020-05-15 | 中国航空工业集团公司西安飞机设计研究所 | Nail load processing method of centralized load transmission structure |
| CN112231864A (en) * | 2020-11-16 | 2021-01-15 | 西北工业大学 | Composite material nail load rapid analysis system |
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