CN105574307B - A kind of determination methods opened up to the two-way amendment critical points of connection structure DFR - Google Patents
A kind of determination methods opened up to the two-way amendment critical points of connection structure DFR Download PDFInfo
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- CN105574307B CN105574307B CN201410535787.1A CN201410535787A CN105574307B CN 105574307 B CN105574307 B CN 105574307B CN 201410535787 A CN201410535787 A CN 201410535787A CN 105574307 B CN105574307 B CN 105574307B
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Abstract
The present invention provides a kind of determination methods opened up to the two-way amendment critical points of connection structure DFR, comprise the following steps：(1) DFR value of the exhibition to connection structure is determined：According to formula DFR=DFRbase·A·B·C·D·E·RCObtain DFR values.(2) calculateFor concrete position of the exhibition calculated to connection structure in aircraft, the Simulating of Fatigue Stress Spectra at the position is calculated, extracts DFR Reference Stress σgAnd its shear stress τ in corresponding spectrums, the basic thickness t of sidings, connecting portion siding boss thickness tsp, it is calculatedNumerical value.
Description
Technical field
The determination methods of the two-way amendment critical points of DFR of the exhibition that patent of the present invention provides to connection structure.
Background technology
It is a kind of connection structure common in aircaft configuration to open up to connection structure.
Since exhibition is to connection structure physical presence three-dimensional stress, it is being calculated by exhibition to connection structure DFR computational methods
After DFR values, generally require to carry out the two-way amendment of DFR according to Subjected To Biaxial Loading connector.But existing method to when need it is two-way
It corrects (i.e. modified critical including the structural parameters such as thickness, diameter fastener, fastener spacing and stress intensity parameter and DFR
Relation) do not define, it can not judge whether to need to correct before amendment, can cause discovery after the completion of correcting work that need not correct in fact
The appearance of situation wastes unnecessary manpower and material resources.
Existing Patents documents are without reference to problem of the present invention.
Therefore, it is necessary to develop whether one kind can need two-way amendment quickly to be judged to opening up to connection structure DFR,
It is exactly the quick judgment method of two-way amendment critical point.
The content of the invention
The present invention provides a kind of determination methods opened up to the two-way amendment critical points of connection structure DFR, which is characterized in that can be high
Effect solves the problems, such as can not to judge critical point in existing method caused by unnecessary amendment, and easy to use, reality
It is strong with property.
Comprise the following steps：
(1) DFR value of the exhibition to connection structure is determined：
According to formula DFR=DFRbase·A·B·C·D·E·RCObtain DFR values.
(2) calculate
For concrete position of the exhibition calculated to connection structure in aircraft, the fatigue stress at the position is calculated
Spectrum, extracts DFR Reference Stress σgAnd its shear stress τ in corresponding spectrums, the basic thickness t of sidings, connecting portion siding
Boss thickness tsp, it is calculatedNumerical value.
(3) p/d is calculated：
Exhibition is taken to calculate the fastener spacing p at position and diameter fastener d to connection structure, the number of p/d is calculated
Value.
(4) t is calculatedsp/d:
Calculated exhibition is taken to the diameter fastener d at connection structure position and the wall panel thickness of fastener connection section position
tsp, t is calculatedspThe numerical value of/d.
(5) reference axis is established to carry out judging whether to need two-way amendment：
WithAbscissa of the numerical value as reference axis, using p/d as the ordinate of reference axis, rule of thumb data into
Row process of fitting treatment obtains different tspCurves of/the d in reference axis region, obtains according to step 2Numerical value looks into reference axis
Abscissa, the p/d obtained according to step 3 looks into the ordinate of reference axis, the t obtained according to step 4sp/ d numerical value looks into corresponding tsp/
The corresponding curve of d parameters, checks whether the point of above-mentioned three groups of data composition falls in corresponding tspThe right side of/d curves, if fallen
The right side of curve then must carry out two-way amendment to the DFR values that step 1 obtains；Otherwise, then without two-way amendment.
(6) to the definite two-way modified DFR of needs of step 5 as a result, pressing《Civil aircraft structures durability and damage tolerance design
Handbook》Fatigue design and analysis chapter 5 relevant portion carry out two-way amendment, calculate used when determining two-way correction factor answer
Force parameterTwo-way correction factorTherefore two-way revised DFR is obtainedbiFor：
Symbol description used above is as follows：
DFR --- CONSTRUCTED SPECIFICATION fatigue rated value；
DFRbase--- the basic value of detail fatigue rating；
DFRbi--- two-way revised DFR values；
A --- hole volumetric efficiency；
B --- alloy and surface treatment coefficient；
C --- immerse oneself in depth coefficient；
D --- material laminate thickness coefficient；
E --- bolt clamps coefficient；
RC--- the specified coefficient of component fatigue；
σg--- it calculates position and opens up to stretching Reference Stress；
τs--- it calculates position and opens up to the shear stress stretched corresponding to Reference Stress；
ts--- the basic thickness of siding；
tsp--- connecting portion siding boss thickness；
P --- fastener spacing；
D --- diameter fastener.
--- two-way correction factor.
Further, after the completion of step 6, two-way modified DFR is not required as a result, in order to verify knot to what step 5 determined
By whether correctly, two-way amendment is carried out according further to the method described in step 6, if correction factorI.e. error is less than
3%, then prove that the two-way amendment critical point judgement that step 5 proposes is correct.
The present invention solves the problems, such as exhibition to the two-way amendment critical points of connection structure DFR, to exhibition to connection structure DFR values into
Row correct before, can to whether need correct (i.e. modified critical point) quickly judged, so as to save unnecessary manpower with
Material resources realize efficient calculating of the exhibition to connection structure DFR.
Description of the drawings
Fig. 1 is to open up to attachment structure schematic diagram,
Fig. 2 is two-way amendment critical point judgment curves figure.
Specific embodiment
Give two groups of different parameters：
a)ts=6.6mm, tsp=8.0mm, d=8.0mm, p=32mm, σg=120.5MPa, τs=35.8MPa；
b)ts=6.3mm, tsp=7.6mm, d=8.0mm, p=32mm, σg=118.1MPa, τs=6.8MPa.
Specific technical solution respectively calculates above-mentioned two groups of parameters as previously described, determines whether to need to carry out
Two-way amendment.
1st, determine to open up the DFR values to structure as shown in Figure 1：
DFR=DFRbase·A·B·C·D·E·RC
Herein DFR calculating process with《Civil aircraft structures durability and damage tolerance design handbook》Existing method is completely the same.
Only providing the corresponding DFR of two groups of parameters is respectively：A) DFR=115MPa；B) DFR=120MPa.
2nd, calculate
For concrete position of the exhibition calculated to connection structure in aircraft, the fatigue stress at the position is calculated
Spectrum, extracts DFR Reference Stress σgAnd its shear stress τ in corresponding spectrums.It is corresponding that above-mentioned two groups of parameters are calculatedNumerical value is respectively：a)b)
3rd, p/d is calculated：
Exhibition is taken to calculate the fastener spacing p at position and diameter fastener d to connection structure, is calculated above-mentioned two groups
The corresponding p/d numerical value of parameter is respectively：A) p/d=4.0；B) p/d=4.0.
4th, t is calculatedsp/d:
Calculated exhibition is taken to the diameter fastener d at connection structure position and the wall panel thickness of fastener connection section position
tsp.The corresponding t of above-mentioned two groups of parameters is calculatedspThe numerical value of/d is respectively：a)tsp/ d=1.0；b)tsp/ d=0.95.
5th, carry out judging whether to need two-way amendment by Fig. 2：
Substitute into what the 2nd step obtainedNumerical value looks into the abscissa of Fig. 2 bottom sides, and the p/d of the 3rd step looks into the p/d on the left of Fig. 2,
The t that 4th step obtainssp/ d numerical value looks into t at the top of Fig. 2spThe corresponding curve of/d parameters checks corresponding three numbers of above-mentioned two groups of parameters
Whether fall on the right side of response curve according to the point of composition：A) fall on the right side of curve；B) fall in the left side of curve.Therefore, it is necessary to
Two-way amendment is carried out to a) organizing the corresponding DFR of parameter, and b) organizes the corresponding DFR of parameter then without two-way amendment.
6th, the DFR of parameter a) is organized as a result, pressing to what the 5th step determined《Civil aircraft structures durability and damage tolerance design handbook》
Fatigue design carries out two-way amendment with analysis chapter 5 relevant portion.Determine stress parameters used during correction factorTwo-way correction factor φ=1-0.45 ω1.4=0.918.Therefore obtain two-way revised
DFRbiFor：DFRbi=DFR × φ=115 × 0.918=105.6MPa.The ＜ 1 of two-way correction factor φ=0.918 is then proved double
To amendment being affected (revised variation percentage is 8.17%) to DFR.
7th, the corresponding DFR of two-way modified b) group parameter is not required as a result, in order to whether verify conclusion to what the 5th step determined
Correctly, still press《Civil aircraft structures durability and damage tolerance design handbook》Fatigue design is carried out with analysis chapter 5 relevant portion
Two-way amendment, if correction factorThen prove that the two-way amendment critical point judgement that the present invention provides is correct.First
Determine stress parameters used during correction factorTwo-way correction factor φ=1-0.45 ω1.4
=0.992.Therefore two-way revised DFR is obtainedbiFor：It is two-way
Correction factorThen show that less (revised variation percentage is 0.83% for influence of the two-way amendment to DFR<
3%), without correcting, then prove that the two-way amendment critical point judgement that the present invention provides is correct.
Claims (1)
1. a kind of determination methods opened up to the two-way amendment critical points of connection structure DFR, which is characterized in that
(1) DFR value of the exhibition to connection structure is determined：
According to formula DFR=DFRbase·A·B·C·D·E·RCObtain DFR values；
(2) calculate
For concrete position of the exhibition calculated to connection structure in aircraft, the Simulating of Fatigue Stress Spectra at the position is calculated, carries
Take out DFR Reference Stress σgAnd its shear stress τ in corresponding spectrums, the basic thickness t of sidings, connecting portion siding boss thickness
Spend tsp, it is calculatedNumerical value；
(3) p/d is calculated：
Exhibition is taken to calculate the fastener spacing p at position and diameter fastener d to connection structure, the numerical value of p/d is calculated；
(4) t is calculatedsp/d:
Calculated exhibition is taken to the diameter fastener d at the connection structure position and wall panel thickness t of fastener connection section positionsp, meter
Calculation obtains tspThe numerical value of/d；
(5) reference axis is established to carry out judging whether to need two-way amendment：
WithAbscissa of the numerical value as reference axis, using p/d as the ordinate of reference axis, rule of thumb data are intended
Conjunction handles to obtain different tspCurves of/the d in reference axis region, obtains according to step 2Numerical value looks into the horizontal stroke of reference axis
Coordinate, the p/d obtained according to step 3 look into the ordinate of reference axis, the t obtained according to step 4sp/ d numerical value looks into corresponding tsp/ d joins
The corresponding curve of number, checks whether the point that the abscissa of above-mentioned reference axis, the ordinate of reference axis form falls in corresponding tsp/d
The right side of curve if fallen on the right side of curve, must carry out two-way amendment to the DFR values that step 1 obtains；Otherwise, then without
Need two-way amendment；
(6) to the definite two-way modified DFR of needs of step 5 as a result, pressing《Civil aircraft structures durability and damage tolerance design hand
Volume》Fatigue design carries out two-way amendment with analysis chapter 5 relevant portion, calculates stress used when determining two-way correction factor
ParameterTwo-way correction factorTherefore two-way revised DFR results are obtained as DFRbi：
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Families Citing this family (3)
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| CN106446344A (en) * | 2016-08-29 | 2017-02-22 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining DFR value of notch structure test piece |
| CN112644734B (en) * | 2020-12-29 | 2023-01-13 | 中国航空工业集团公司西安飞机设计研究所 | Method for determining fatigue rating of aircraft stringer and skin connection detail |
| CN114428026A (en) * | 2021-12-30 | 2022-05-03 | 中国航空工业集团公司西安飞机设计研究所 | Fatigue analysis method for aircraft fuselage skin circumferential butt seam band plate connecting structure |
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