CN105468915A - Method for calculating strength of longitudinal wall plate with opening - Google Patents
Method for calculating strength of longitudinal wall plate with opening Download PDFInfo
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- CN105468915A CN105468915A CN201510836198.1A CN201510836198A CN105468915A CN 105468915 A CN105468915 A CN 105468915A CN 201510836198 A CN201510836198 A CN 201510836198A CN 105468915 A CN105468915 A CN 105468915A
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of aircraft structure design, and especially relates to a method for calculating strength of a longitudinal wall plate with an opening, so as to solve the problem that a strength calculation result of the existing longitudinal wall plate with a large opening is inaccurate and the efficiency is low. The calculation method comprises the following steps: judging whether the opening of the longitudinal wall plate satisfies a predetermined calculation condition; when the predetermined condition is satisfied, calculating an internal force of a predetermined section of an opening root; calculating stress of a predetermined section of the opening; amending the stress of the predetermined section; calculating Von Mises stress of an opening corner web according to the amended stress of the predetermined section; and comparing the amended stress of the predetermined section and the Von Mises stress of the corner web with a predetermined allowable stress value, and obtaining static strength of the longitudinal wall plate. The method for calculating the strength of the longitudinal wall plate with the opening provided by the invention can more accurately and efficiently calculate a stress condition of the longitudinal wall plate at the large opening, and reduce the structural weight on the premise of ensuring the strength of the longitudinal wall plate.
Description
Technical field
The present invention relates to field of airplane structure, particularly relate to a kind of strength calculation method with the longitudinal panels of opening.
Background technology
In aeroplane structure design, because of the needs that loss of weight and equipment are installed, usually need to arrange big uncork in longitudinal panels.The strength calculation method of general big uncork longitudinal panels is that the simplified partial of longitudinal panels around big uncork is become firm frame, by the internal force and the section stress that just enclose frame theory calculate longitudinal panels, and then the static strength of assessment big uncork longitudinal panels.
But, the part of longitudinal panels around big uncork is general does not meet the condition of just having enclosed frame, and the selection range just having enclosed frame does not have clear and definite defining, often too conservative by the longitudinal panels just enclosing frame Theoretical Design, pay larger construction weight cost, counting yield is low, and the strength Calculation Result accuracy finally obtained is poor.
Summary of the invention
The object of this invention is to provide a kind of strength calculation method with the longitudinal panels of opening, the inaccurate and inefficient problem with the strength Calculation Result solving existing big uncork longitudinal panels.
Technical scheme of the present invention is:
There is a strength calculation method for the longitudinal panels of opening, comprise the steps:
Step one, judge whether the opening of longitudinal panels meets predetermined design conditions, when meeting described predetermined condition, carry out step 2;
Step 2, calculates the internal force of the predetermined cross-sectional of described open roots;
Step 3, calculates the stress of the predetermined cross-sectional of described opening according to engineering beam algorithm;
Step 4, revises the stress of described predetermined cross-sectional;
Step 5, the VonMises stress of opening angle point web according to the Stress calculation of revised described predetermined cross-sectional;
Step 6, compares the VonMises stress of the stress of revised described predetermined cross-sectional and described angle point web and predetermined permissible stress value, obtains the static strength of described longitudinal panels.
Preferably, the flat shape of described longitudinal panels and described opening is rectangle.
Preferably, in described step one, described predetermined design conditions are:
B >=0.4h and 0.2h≤a≤0.75h,
Wherein, a is the length of the opening of described longitudinal panels, and b is the wide of the opening of described longitudinal panels, and h is the wide of longitudinal panels.
Preferably, described predetermined cross-sectional is the cross section of the Width along described opening.
Preferably, in described step 2, when the described predetermined cross-sectional bending stiffness ratio of described opening up-down structure is in 0.8 ~ 1.25 scope, moment M, the axle power N and shearing Q of predetermined cross-sectional according to following formulae discovery respectively:
M＝qa(h+b)/8；N＝qa/2；Q＝qh/2；
Wherein, q is the shearing flow of described longitudinal panels.
Preferably, in described step 2, when the described predetermined cross-sectional bending stiffness ratio of described opening up-down structure is not in 0.8 ~ 1.25 scope, from finite element model, extract the moment M of described predetermined cross-sectional, axle power N and shearing Q.
The invention has the advantages that:
The strength calculation method with the longitudinal panels of opening of the present invention, for big uncork longitudinal panels, can more precise and high efficiency calculate the stress situation of longitudinal panels at big uncork place, alleviate construction weight under ensureing the prerequisite of longitudinal panels intensity.
Accompanying drawing explanation
Fig. 1 is the big uncork longitudinal panels structural representation that the present invention has a strength calculation method embodiment of the longitudinal panels of opening;
Fig. 2 is A-A cut-open view in Fig. 1.
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
Strength calculation method the present invention below in conjunction with accompanying drawing 1 and Fig. 2 to the longitudinal panels of opening is described in further details.
The invention provides a kind of strength calculation method with the longitudinal panels of opening, comprise the steps:
Step one, judge whether the opening of longitudinal panels meets predetermined design conditions, when meeting predetermined condition, carry out step 2.
Step 2, calculates the internal force of the predetermined cross-sectional of open roots.
Step 3, according to the internal force of above-mentioned predetermined cross-sectional and by engineering beam algorithm, calculates the stress of the predetermined cross-sectional of opening.
Step 4, revises the stress of predetermined cross-sectional.
Step 5, according to the VonMises stress of the Stress calculation opening angle point web of revised predetermined cross-sectional.
Step 6, compares the VonMises stress of the stress of revised predetermined cross-sectional and angle point web and predetermined permissible stress value, obtains the static strength of longitudinal panels.Predetermined permissible stress value can be chosen according to the airplane design handbook selected.
The strength calculation method with the longitudinal panels of opening of the present invention, for big uncork longitudinal panels, can more precise and high efficiency calculate the stress situation of longitudinal panels at big uncork place, alleviate construction weight under ensureing the prerequisite of longitudinal panels intensity.
Step one in the strength calculation method with the longitudinal panels of opening of the present invention, predetermined design conditions are opening shape according to longitudinal panels and determine; In the present embodiment, especially as depicted in figs. 1 and 2, the flat shape of preferred longitudinal panels and opening is rectangle.
Correspondingly, predetermined design conditions are:
B >=0.4h and 0.2h≤a≤0.75h;
Wherein, a is the length of the opening of longitudinal panels, and b is the wide of the opening of longitudinal panels, and h is the wide of longitudinal panels.
Of the present invention have in the strength calculation method of the longitudinal panels of opening, and predetermined cross-sectional is the cross section of the Width along opening.In above-mentioned steps two, when the predetermined cross-sectional bending stiffness ratio of opening up-down structure is in 0.8 ~ 1.25 scope, respectively according to moment M, the axle power N and shearing Q of following formulae discovery predetermined cross-sectional:
M＝qa(h+b)/8；N＝qa/2；Q＝qh/2；
Wherein, q is the shearing flow of longitudinal panels.
Equally, in above-mentioned steps two, when the predetermined cross-sectional bending stiffness ratio of opening up-down structure is not in 0.8 ~ 1.25 scope, from finite element model, extract the moment M of predetermined cross-sectional, axle power N and shearing Q.
Particularly, in a preferred embodiment of the present embodiment, in step one, get a=500mm, b=600mm, h=800mm, then meet above-mentioned design conditions;
In step 2, when the flexural rigidity of section ratio of opening up-down structure is 0.8 ~ 1.25 time, get q=100N/mm, then moment M=qa (h+b)/8=8125000Nmm, axle power N=qa/2=25000N, shearing Q=qh/2=40000N; Otherwise moment M, axle power N and shearing Q extract from finite element model.
In step 3, get δ 1=6mm, δ 2=6mm, h1=88mm, c=30mm, the stress σ 30=356.6MPa of a S3 (with reference to Fig. 2) is calculated, the stress σ 40=412.9MPa of some S4 (with reference to Fig. 2), the shear stress τ A-A0=75.76MPa in A-A cross section according to engineering beam algorithm.
In step 4, the correction formula pair cross-section stress that the method combined with physical test by numerical experimentation is obtained is revised:
The stress σ 3=σ 30=356.6MPa of some S3;
The stress σ 4=k α σ 40=356.4MPa of some S4, α=0.56+0.7e-β/0.3=0.785, β=c δ 2/ (h1 δ 1)=0.341, wherein, k=1.1, k α σ 40 is correction formula, k is additional coefficient, and c is the height of cross section rib, the inner distance of h1 cross section rib, δ 1 is cross section web thickness, the thickness of δ 2 cross section rib;
The shear stress τ A-A=τ A-A0=75.76MPa in A-A cross section;
The stress of some S1 (with reference to Fig. 1) is σ 1=σ 4=356.4MPa.
In step 5, the VonMises stress σ 2=379.8MPa of some S2 (with reference to Fig. 1), for x direction stress (i.e. 356.4MPa) with σ 4, σ 1 is y direction stress (i.e. 356.4MPa), and τ A-A is that three principle stresses that shear stress (i.e. 75.76MPa) calculates are obtained by VonMises Stress calculation formulae discovery.
In step 6, according to revised stress and the VonMises stress of angle point web and the comparative result of airplane design handbook permissible stress value, the static strength of assessment big uncork longitudinal panels; The permissible stress value that the VonMises stress value of revised stress value and angle point web is all less than or equal to airplane design handbook respective material (supposes that material is 7B04 herein, then permissible stress value is σ b=490MPa, σ lin=418MPa, τ b=248MPa) time, big uncork longitudinal panels meets static strength and requires that (calculated stress is less than permissible stress herein, meet request for utilization), otherwise, do not meet static strength requirement.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (6)
1. there is a strength calculation method for the longitudinal panels of opening, it is characterized in that: comprise the steps:
Step one, judge whether the opening of longitudinal panels meets predetermined design conditions, when meeting described predetermined condition, carry out step 2;
Step 2, calculates the internal force of the predetermined cross-sectional of described open roots;
Step 3, calculates the stress of the predetermined cross-sectional of described opening according to engineering beam algorithm;
Step 4, revises the stress of described predetermined cross-sectional;
Step 5, the VonMises stress of opening angle point web according to the Stress calculation of revised described predetermined cross-sectional;
Step 6, compares the VonMises stress of the stress of revised described predetermined cross-sectional and described angle point web and predetermined permissible stress value, obtains the static strength of described longitudinal panels.
2. the strength calculation method with the longitudinal panels of opening according to claim 1, is characterized in that, the flat shape of described longitudinal panels and described opening is rectangle.
3. the strength calculation method with the longitudinal panels of opening according to claim 2, is characterized in that, in described step one, described predetermined design conditions are:
B >=0.4h and 0.2h≤a≤0.75h,
Wherein, a is the length of the opening of described longitudinal panels, and b is the wide of the opening of described longitudinal panels, and h is the wide of longitudinal panels.
4. the strength calculation method with the longitudinal panels of opening according to claim 3, is characterized in that, described predetermined cross-sectional is the cross section of the Width along described opening.
5. the strength calculation method with the longitudinal panels of opening according to claim 4, it is characterized in that, in described step 2, when the described predetermined cross-sectional bending stiffness ratio of described opening up-down structure is in 0.8 ~ 1.25 scope, moment M, the axle power N and shearing Q of predetermined cross-sectional according to following formulae discovery respectively:
M＝qa(h+b)/8；N＝qa/2；Q＝qh/2；
Wherein, q is the shearing flow of described longitudinal panels.
6. the strength calculation method with the longitudinal panels of opening according to claim 5, it is characterized in that, in described step 2, when the described predetermined cross-sectional bending stiffness ratio of described opening up-down structure is not in 0.8 ~ 1.25 scope, from finite element model, extract the moment M of described predetermined cross-sectional, axle power N and shearing Q.
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| CN201510836198.1A CN105468915B (en) | 2015-11-25 | 2015-11-25 | A kind of strength calculation method with the longitudinal panels being open |
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| CN201510836198.1A CN105468915B (en) | 2015-11-25 | 2015-11-25 | A kind of strength calculation method with the longitudinal panels being open |
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| CN105468915B CN105468915B (en) | 2018-10-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109376476A (en) * | 2018-11-28 | 2019-02-22 | 中国航空工业集团公司沈阳飞机设计研究所 | Erection stress engineering calculating method |
| CN112763166A (en) * | 2020-12-29 | 2021-05-07 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining lateral rigidity of large-opening structure of cabin body of rectangular fuselage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130180176A1 (en) * | 2012-01-13 | 2013-07-18 | Mitsubishi Aircraft Corporation | Airframe of aircraft, panel assembly for aircraft |
| CN104200092A (en) * | 2014-08-28 | 2014-12-10 | 上海飞机制造有限公司 | Multi-pose modeling method for deformation of aircraft thin-wall piece during automatic drilling and automatic riveting |
| CN104699873A (en) * | 2013-12-06 | 2015-06-10 | 中国飞机强度研究所 | Method for analyzing numerical value of opening structure of aircraft panel |
-
2015
- 2015-11-25 CN CN201510836198.1A patent/CN105468915B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130180176A1 (en) * | 2012-01-13 | 2013-07-18 | Mitsubishi Aircraft Corporation | Airframe of aircraft, panel assembly for aircraft |
| CN104699873A (en) * | 2013-12-06 | 2015-06-10 | 中国飞机强度研究所 | Method for analyzing numerical value of opening structure of aircraft panel |
| CN104200092A (en) * | 2014-08-28 | 2014-12-10 | 上海飞机制造有限公司 | Multi-pose modeling method for deformation of aircraft thin-wall piece during automatic drilling and automatic riveting |
Non-Patent Citations (2)
| Title |
|---|
| NINGXIANG WU 等: "《Residual strength of stiffened panels with multiple site damage》", 《9TH INTERNATIONAL CONFERENCE ON RELIABILITY, MAINTAINABILITY AND SAFETY》 * |
| 王玉 等: "《大型运输机机身大开口结构强度设计方法》", 《机械科学与技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109376476A (en) * | 2018-11-28 | 2019-02-22 | 中国航空工业集团公司沈阳飞机设计研究所 | Erection stress engineering calculating method |
| CN109376476B (en) * | 2018-11-28 | 2023-04-18 | 中国航空工业集团公司沈阳飞机设计研究所 | Assembly stress engineering calculation method |
| CN112763166A (en) * | 2020-12-29 | 2021-05-07 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining lateral rigidity of large-opening structure of cabin body of rectangular fuselage |
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| CN105468915B (en) | 2018-10-09 |
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