CN106442180A - Testing method for design allowable value of composite material opening pore compressive strength - Google Patents
Testing method for design allowable value of composite material opening pore compressive strength Download PDFInfo
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- CN106442180A CN106442180A CN201610808047.XA CN201610808047A CN106442180A CN 106442180 A CN106442180 A CN 106442180A CN 201610808047 A CN201610808047 A CN 201610808047A CN 106442180 A CN106442180 A CN 106442180A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0085—Compressibility
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
Abstract
The invention discloses a testing method for a design allowable value of a composite material opening pore comprehensive strength. The testing method for the design allowable value of the composite material opening pore comprehensive strength comprises the steps of 1, obtaining basic values of impact factors of technology batch, hygrothermal environment, thickness, diameter of opening pore, ratio of breadth to diameter, pore countersunk head and the opening pore compressive strength of the composite material through a cordwood system testing component and testing stage; 2, obtaining the design allowable value of the composite material opening pore comprehensive strength through a formula and the obtained data in the step 1. The adoption of the testing method for the design allowable value of the composite material opening pore comprehensive strength can solve problems in engineering practices that the obtained design allowable value of the composite material opening pore comprehensive strength through a traditional testing method has a large deviation, the quantity of testing articles is large, the cycle of testing is long, and the testing result is influenced greatly by constraint conditions such as size effect, boundary conditions and load distribution.
Description
Technical field
The present invention relates to Aircraft Composite Structure experimental technique field, more particularly to a kind of composite perforate compression
Intensity Design allowable value test method.
Background technology
Existing acquisition perforate composite compressive strength Design permissible value test method adopts blanket curve method (AML mostly
Method), in blanket curve method, laying angle includes 0 °, -45 ° ,+45 °, 90 °, and laying percentage number is not less than 10%.
AML method be used in symmetrically, in a balanced way in laminate, laminate includes 0 °, 90 ° and ± 45° angle degree layer, and often
One angle layer percentage is not less than 10%.AML deducts longitudinal fiber layer (0 °) by angle layer (± 45 °) percentage and draws.
When laminate is unbalanced, AML is by following formula tabular form：
So laminate has the angle layer of low percentage or the longitudinal layer of high percentage, AML can be very low.AML reflection
It is that load after defect periphery or fibre breakage for the laminate redistributes ability, also reflection defect stress all round is seriously
Number, that is, angle layer percentage is higher, and post-impact compression and perforate compressive strength are higher.
Because standards and norms require, when obtaining the test of design of material allowable value, allowable value does not allow according to test knot
Fruit or trial curve extrapolated, so blanket curve method laying percentage of testpieces in planning experiments part will fill whole
Shadow region shown in individual Fig. 6, thus causes testpieces quantity greatly, the test period is long, and a lot of test data is in aircraft
Do not apply in actual design, cause great waste.
And the testpieces of compressive strength Design permissible value presses code requirement after AML method acquisition composite impact, test
Part a size of " 100mm × 150mm " (component-level testpieces), because testpieces size is little, by dimensional effect, boundary condition, load
The actual conditions impact such as lotus distribution is larger, and general obtained experimental result deviation is larger.
Referring to Fig. 9, Fig. 9 is the schematic diagram of AML method, and Fig. 9 shows：Angle layer percentage is higher, post-impact compression
Higher with perforate compressive strength.
Thus, it is desirable to have a kind of technical scheme come to overcome or at least mitigate prior art at least one drawbacks described above.
Content of the invention
It is an object of the invention to provide a kind of composite perforate compressive strength Design permissible value test method is overcoming
Or at least mitigate prior art at least one of drawbacks described above.
For achieving the above object, the present invention provides a kind of composite perforate compressive strength Design permissible value test method,
For obtaining perforate composite compressive strength Design permissible value based on AML method, described composite perforate compressive strength sets
Meter allowable value test method comprises the steps：Step 1：Composite is obtained by building block system test element level experimental stage
Process batch factor of influence, hygrothermal environment factor of influence and the thickness effect factor, opening diameter factor of influence, width-diameter
Than factor of influence, hole countersunk head factor of influence and perforate compressive strength basic value；Step 2：Obtain by formula and described step 1
The data obtaining, obtains perforate composite compressive strength Design permissible value.
Preferably, described step 1 is specially：The testpieces group of 3 kinds of AML values of planning, forms the first testpieces group, the second examination
Test part group and the 3rd testpieces group, thus obtaining process batch factor of influence, hygrothermal environment factor of influence and thickness effect
The factor, opening diameter factor of influence, width-diameter are than factor of influence, hole countersunk head factor of influence and perforate compressive strength basic value.
Preferably, described process batch factor of influence test is specially：B a reference value is taken to simplify sampling test matrix shape
Formula, respectively from the first testpieces group obtain 18 the first testpieces, obtain 18 the second testpieces from the second testpieces group, from the
Three testpieces groups obtain 18 the 3rd testpieces；Every group all using 3 batch prepregs, 2 cure cycle, 18 testpieces；
In the case of the conditions such as hygrothermal environment, geometric parameter, ply stacking-sequence are identical, process batch factor of influence is asked for by formula
CBB.
Preferably, described hygrothermal environment factor of influence test includes：Obtain same material batch, same curing process, several
What parameter identical the first testpieces 18, the second testpieces 18 and the 3rd testpieces 18, wherein, the first testpieces,
Respectively take in second testpieces and the 3rd testpieces 6 for low temperature dry state CTD test, the first testpieces, the second testpieces with
And the 3rd respectively take 6 in testpieces for the test of room temperature dry state RTD, the first testpieces, the second testpieces and the 3rd testpieces
In respectively take 6 for high temperature hygrometric state ETW test, by described low temperature dry state CTD test, room temperature dry state RTD test and high temperature
Hygrometric state ETW tests, and is used for obtaining hygrothermal environment factor of influence CEN, described hygrothermal environment factor of influence CENObtained by equation below
?：CEN=Si/SRTD；Wherein, SiAverage inefficacy strain for high temperature hygrometric state ETW or low temperature dry state CTD；SRTDPut down for room temperature dry state
All lost efficacy and strained.
Preferably, described thickness effect factorial experiment includes：From the first testpieces group, the second testpieces group and the 3rd examination
Test and in part group, obtain each 18 different of testpieces of same material batch, same curing process, the thickness in geometric parameter, every group
In testpieces, each 6 are used for carrying out the test of room temperature dry state RTD, and obtain thickness effect factor C by equation belowTH：CTH=
(St/S0.18)；StRepresent that each average compression failure of testpieces thickness strains；S0.18Represent the average compression failure of 0.18in thickness
Strain.
Preferably, from the first testpieces group, the second testpieces group and the 3rd testpieces group obtain same material batch,
Each 36 of the different testpieces of opening diameter in same curing process, geometric parameter, in every group of testpieces, individual 6 are used for carrying out room
Warm dry state RTD test, and opening diameter factor of influence C is obtained by equation belowD：CD=(SD/S1/4)；Wherein, SDRepresent many
Plant the testpieces average compression failure strain of diameter；S1/4Represent that the average compression failure of a diameter of 1/4in testpieces strains
Same material batch, same solid is obtained from the first testpieces group, the second testpieces group and the 3rd testpieces group
More each than different testpieces 24 of width-diameter in metallization processes, geometric parameter, in every group of testpieces, each 6 are used for carrying out room temperature
Dry state RTD is tested, and obtains width-diameter than factor of influence C by equation belowW/D：CW/D=(SW/D/S5), wherein, SW/DRepresent
The testpieces average compression failure strain of multiple width-diameter ratio；S5Represent that width-diameter averagely compresses than the testpieces for 5
Lost efficacy and strained；
Obtain same material batch, same curing process from the second testpieces group, countersunk head depth is different in geometric parameter
Each 30 of testpieces, wherein, choose 5 kinds of countersunk head specifications, every kind of specification chooses 6 the second testpieces, be used for carrying out room temperature doing
State RTD is tested, and obtains hole countersunk head factor of influence C by equation belowCSK：CCSK=(SCSK/S0)SCSKRepresent that multiple hole countersunk head is deep
The testpieces average compression failure strain of degree；S0Represent that the average compression failure of non-counter sink testpieces strains.
Preferably, obtain same material batch, same curing process, geometric parameter identical the first testpieces 6, second
Testpieces 6 and the 3rd testpieces 6, wherein, the first testpieces is used for low temperature dry state CTD to be tested, and the second testpieces is used for
Room temperature dry state RTD is tested, and the 3rd testpieces is used for high temperature hygrometric state ETW to be tested, and is tested by described low temperature dry state CTD, room temperature is done
The test of state RTD and high temperature hygrometric state ETW test, are used for obtaining perforate compressive strength basic value SBASE.
Preferably, the formula in described step 2 is：SOHC-ALL=SBASE*CBB*CEN*CTH*CD*CW/D*CCSK[με]；Wherein,
SOHC-ALLFor perforate composite compressive strength Design permissible value；SBASEFor perforate compressive strength basic value SBASE；CBBCriticize for technique
Secondary factor of influence；CENFor hygrothermal environment factor of influence；CTHFor the thickness effect factor；CDFor opening diameter factor of influence；CW/DFor width
Degree-diameter compares factor of influence；CCSKFor hole countersunk head factor of influence.
Preferably, the AML value of described first testpieces group is -28, and the AML value of described second testpieces group is 0, described
The AML value of three testpieces groups is 25.
Conventional test side be can solve the problem that using the composite perforate compressive strength Design permissible value test method of the application
The perforate composite compressive strength Design permissible value deviation that method is obtained is big, and testpieces quantity is many, and the test period is long, test knot
Fruit is affected larger engineering reality by constraintss such as dimensional effect, boundary condition and load distribution, for obtaining perforate composite wood
Material compressive strength Design permissible value provides a kind of advanced experimental study method.
Brief description
Fig. 1 is the stream of composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Journey schematic diagram.
Fig. 2 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Process batch factor of influence schematic diagram.
Fig. 3 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Hygrothermal environment factor of influence schematic diagram.
Fig. 4 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Thickness effect factor schematic diagram.
Fig. 5 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Opening diameter factor of influence schematic diagram.
Fig. 6 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Width-diameter is than factor of influence schematic diagram.
Fig. 7 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Hole countersunk head factor of influence schematic diagram.
Fig. 8 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Perforate compressive strength basic value schematic diagram.
Fig. 9 is the schematic diagram of AML method.
Specific embodiment
For making purpose, technical scheme and advantage that the present invention is implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from start to finish or class
As the label element that represents same or similar element or there is same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.Embodiment below with reference to Description of Drawings is exemplary it is intended to use
In the explanation present invention, and it is not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.Under
Face combines accompanying drawing and embodiments of the invention is described in detail.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", "front", "rear",
The orientation of instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward " or position relationship are based on accompanying drawing institute
The orientation showing or position relationship, are for only for ease of the description present invention and simplify description, rather than the dress of instruction or hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that protecting to the present invention
The restriction of scope.
Fig. 1 is the stream of composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Journey schematic diagram.Fig. 2 is in composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
Process batch factor of influence schematic diagram.Fig. 3 is composite perforate compressive strength design according to a first embodiment of the present invention
Hygrothermal environment factor of influence schematic diagram in allowable value test method.Fig. 4 is composite according to a first embodiment of the present invention
Thickness effect factor schematic diagram in perforate compressive strength Design permissible value test method.Fig. 5 is to be implemented according to the present invention first
Opening diameter factor of influence schematic diagram in the composite perforate compressive strength Design permissible value test method of example.Fig. 6 is root
According to the width in the composite perforate compressive strength Design permissible value test method of first embodiment of the invention-diameter than impact
Factor schematic diagram.Fig. 7 is composite perforate compressive strength Design permissible value test method according to a first embodiment of the present invention
In hole countersunk head factor of influence schematic diagram.Fig. 8 is composite perforate compressive strength design according to a first embodiment of the present invention
Perforate compressive strength basic value schematic diagram in allowable value test method.
Composite perforate compressive strength Design permissible value test method as shown in Figure 1, for being obtained based on AML method
Perforate composite compressive strength Design permissible value, this composite perforate compressive strength Design permissible value test method include as
Lower step：Step 1：Obtain the process batch factor of influence, damp and hot of composite by building block system test element level experimental stage
Environmental Factors and the thickness effect factor, opening diameter factor of influence, width-diameter affect than factor of influence, hole countersunk head
The factor and perforate compressive strength basic value；Step 2：By the data obtaining in formula and step 1, obtain perforate composite
Compressive strength Design permissible value.
Conventional test side be can solve the problem that using the composite perforate compressive strength Design permissible value test method of the application
The composite perforate compressive strength Design permissible value deviation that method is obtained is big, and testpieces quantity is many, and the test period is long, test knot
Fruit is affected larger engineering reality by constraintss such as dimensional effect, boundary condition and load distribution, opens for obtaining composite
Pore pressure contracting Intensity Design allowable value provides a kind of advanced experimental study method.
In the present embodiment, step 1 is specially：Planning 3 kinds of AML values testpieces group, formation the first testpieces group, second
Testpieces group and the 3rd testpieces group, thus obtain process batch factor of influence, hygrothermal environment factor of influence and thickness shadow
The sound factor, opening diameter factor of influence, width-diameter are more basic than factor of influence, hole countersunk head factor of influence and perforate compressive strength
Value.
In the present embodiment, process batch factor of influence test is specially：B a reference value is taken to simplify sampling test matrix shape
Formula, respectively from the first testpieces group obtain 18 the first testpieces, obtain 18 the second testpieces from the second testpieces group, from the
Three testpieces groups obtain 18 the 3rd testpieces；Every group all using 3 batch prepregs, 2 cure cycle, 18 testpieces,
Specifically, it is to simplify B a reference value sampling requirement to meet using 3 batch prepregs, 2 cure cycle.Hygrothermal environment,
In the case of the conditions such as geometric parameter, ply stacking-sequence are identical, process batch factor of influence C is asked for by formulaBB.Process batch
Factor of influence CBBRefer to Fig. 2 with the relation of AML.
In the present embodiment, described hygrothermal environment selects room temperature dry state experimental condition, and described geometric parameter includes thickness, nail
Bore dia, width-diameter ratio, non-countersunk head；Described CBBUsing equation below：
σBA reference value/RTD represents 3 batches of room temperature dry state state, the B a reference value of 2 curing process；
σAveragely/RTDRepresent the average inefficacy strain of room temperature dry state state.
In the present embodiment, hygrothermal environment factor of influence test includes：Obtain same material batch, same curing process,
First testpieces 18 of geometric parameter identical (thickness, nail diameter, width-diameter ratio, non-countersunk head etc.), the second testpieces 18
Part and the 3rd testpieces 18, wherein, respectively take 6 for low in the first testpieces, the second testpieces and the 3rd testpieces
Warm dry state CTD test, respectively takes 6 for the examination of room temperature dry state RTD in the first testpieces, the second testpieces and the 3rd testpieces
Test, respectively take 6 in the first testpieces, the second testpieces and the 3rd testpieces for high temperature hygrometric state ETW test, by described low
Warm dry state CTD test, the test of room temperature dry state RTD and high temperature hygrometric state ETW test, are used for obtaining hygrothermal environment factor of influence CEN,
Described hygrothermal environment factor of influence CENObtained by equation below：
CEN=Si/SRTD；Wherein,
SiAverage inefficacy strain for high temperature hygrometric state ETW or low temperature dry state CTD；
SRTDAveragely lost efficacy strain for room temperature dry state.9 C can be obtained using above formulaEN, lower 3 of wherein each AML.Damp and hot ring
Border factor of influence CENRefer to Fig. 3 with the relation of AML.
In the present embodiment, described thickness effect factorial experiment includes：From the first testpieces group, the second testpieces group and
Same material batch, same curing process, thickness difference (other geometric parameters in geometric parameter are obtained in 3rd testpieces group
Number：Nail diameter, width-diameter ratio, non-countersunk head etc.) each 18 of testpieces, each 6 in every group of testpieces (point carry out for 3 times,
Every group consumes 18 altogether) it is used for carrying out the test of room temperature dry state RTD, and thickness effect factor C is obtained by equation belowTH：
CTH=(St/S0.18)
StRepresent that each average compression failure of testpieces thickness strains；
S0.18Represent the strain of 0.18in thickness average compression failure.9 C can be obtained using above formulaTH, 3 under wherein each AML
Individual.Thickness effect factor CTHRefer to Fig. 4 with the relation of AML.In the present embodiment, each average compression failure of testpieces thickness should
Become and include the strain of 0.12in or 0.24in thickness average compression failure.
In the present embodiment, obtain same material from the first testpieces group, the second testpieces group and the 3rd testpieces group
Opening diameter difference (other geometric parameters in charge, same curing process, geometric parameter：Thickness, width-diameter ratio, non-heavy
First-class) each 36 of testpieces, 6 in every group of testpieces, (point tested for 6 times, public consume every group of testpieces 36) is used for
Carry out the test of room temperature dry state RTD, and opening diameter factor of influence C is obtained by equation belowD：
CD=(SD/S1/4)；Wherein,
SDRepresent the testpieces average compression failure strain of multiple diameter；
S1/4Represent that the average compression failure of a diameter of 1/4in testpieces strains.
18 C can be obtained using above formulaTH, lower 6 of wherein each AML.Opening diameter factor of influence CDDetailed with the relation of AML
See Fig. 5.In the present embodiment, SDRepresent the testpieces of the diameter of a diameter of 5/32in, 3/16in, 5/16in, 3/8in, 1/2in
Average compression failure strain.
Same material batch, same solid is obtained from the first testpieces group, the second testpieces group and the 3rd testpieces group
In metallization processes, geometric parameter width-diameter than different testpieces each 24 (other geometric parameters：Thickness, non-countersunk head, nail
Diameter etc.), (tested in four times, consume every group of testpieces 24 altogether) each 6 in every group of testpieces and be used for carrying out room temperature and do
State RTD is tested, and in the present embodiment, obtains width-diameter than factor of influence C by equation belowW/D：
CW/D=(SW/D/S5), wherein,
SW/DRepresent the testpieces average compression failure strain of multiple width-diameter ratio；
S5Represent the average compression failure strain than the testpieces for 5 of width-diameter.12 C can be obtained using above formulaTH, its
In lower 4 of each AML.Width-diameter is than factor of influence CW/DRefer to Fig. 6 with the relation of AML.SW/DRepresent that width-diameter ratio is
3rd, 4,6 testpieces average compression failure strain.
Same material batch, same curing process, geometric parameter (other geometric parameters are obtained from the second testpieces group：
Thickness, width-diameter ratio, nail diameter etc.) in each 30 of the different testpieces of countersunk head depth, wherein, choose 5 kinds of countersunk heads rule
Lattice, every kind of specification chooses 6 the second testpieces, is used for carrying out the test of room temperature dry state RTD (carrying out altogether 4 times, consuming the second test altogether
Part 30), in the present embodiment, the test group that the second testpieces is 0 for AML, above formula can obtain hole countersunk head factor of influence 5,
Hole countersunk head factor of influence C is obtained by equation belowCSK：
CCSK=(SCSK/S0)
SCSK(countersunk head percent depth is that countersunk head is deep for the testpieces average compression failure strain of expression multiple hole countersunk head depth
Degree/laminate thickness)；
S0Represent that the average compression failure of non-counter sink testpieces strains.Hole countersunk head factor of influence CCSKRefer to the relation of AML
Fig. 7.In the present embodiment, SCSKExpression hole countersunk head depth is 20%, 40%, 60%, the 80% average compression failure of testpieces is answered
Become.
In the present embodiment, same material batch, same curing process, geometric parameter identical the first testpieces 6 are obtained
Part, the second testpieces 6 and the 3rd testpieces 6, wherein, the first testpieces is used for low temperature dry state (CTD) to be tested, the second examination
Test part to test for room temperature dry state (RTD), the 3rd testpieces is used for high temperature hygrometric state (ETW) to be tested, by described low temperature dry state
(CTD) test, room temperature dry state (RTD) test and high temperature hygrometric state (ETW) test, are used for obtaining perforate compressive strength basic value
SBASE.Perforate compressive strength basic value SBASERefer to Fig. 8 with the relation of AML.
In the present embodiment, due to not allowing when obtaining composite perforate compressive strength Design permissible value to extrapolate, institute
To obtain perforate compressive strength basic value SBASEWhen, AML also to be planned is less than -28 and AML testpieces being more than 25.Obtain perforate
Compressive strength basic value SBASEWhen (this value is obtained by test), testpieces basic configuration refers to following table.
| Project | Configuration |
| Statistics | Mean value |
| Experimental enviroment | Room temperature dry state (RTD) |
| Diameter (in) | 1/4 |
| Thickness (in) | 0.18～0.26 |
| Width-diameter ratio | 5 |
| Hole | Non- countersunk head |
| AML | -35\-28\-10\0\10\25\45 |
It is understood that when allowing extrapolation it is not necessary to obtain perforate compressive strength basic value SBASEWhen, also to plan
AML is less than -28 and AML testpieces being more than 25.
In the present embodiment, the formula in described step 2 is：
SOHC-ALL=SBASE*CBB*CEN*CTH*CD*CW/D*CCSK[με]；Wherein,
SOHC-ALLFor perforate composite compressive strength Design permissible value；
SBASEFor perforate compressive strength basic value SBASE；
CBBFor process batch factor of influence；
CENFor hygrothermal environment factor of influence；
CTHFor the thickness effect factor；
CDFor opening diameter factor of influence；
CW/DCompare factor of influence for width-diameter；
CCSKFor hole countersunk head factor of influence；
[μ ε] is the unit of strain, and finally giving Design permissible value unit is exactly this, dimensionless unit.
In the present embodiment, the AML value of the first testpieces group is -28, and the AML value of the second testpieces group is 0, the 3rd test
The AML value of part group is 25.
The composite perforate compressive strength Design permissible value test method Consideration of the application is comprehensively thorough, test side
Method is simple and practical, and this test method has taken into full account process batch, hygrothermal environment, thickness, opening diameter, width-diameter ratio, hole
Countersunk head significantly affects on composite perforate compressive strength Design permissible value, and is tested by composite building block system single-stage
(component-level test) obtains all factors of influence and perforate compressive strength basic value.
The composite perforate compressive strength Design permissible value test method of the application, compared with blanket curve method, has examination
Test number of packages amount less, the test period is shorter, test funds are less, by the condition shadow such as dimensional effect, boundary condition and load distribution
Sound is less, and obtained perforate composite compressive strength Design permissible value is closer to the actual technical characterstic of engineering.
It is understood that in the present embodiment, it is prior art that B benchmark simplifies sampling test matrix, and B a reference value is existing
There is the value that technology can obtain, available normal distribution method obtains.Average strain of losing efficacy obtains for test.
Last it is to be noted that：Above example only in order to technical scheme to be described, is not intended to limit.To the greatest extent
Pipe has been described in detail to the present invention with reference to the foregoing embodiments, it will be understood by those within the art that：It is still
Technical scheme described in foregoing embodiments can be modified, or wherein some technical characteristics are carried out with equivalent replacing
Change；And these modifications or replacement, do not make the essence of appropriate technical solution depart from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (9)
1. a kind of composite perforate compressive strength Design permissible value test method, for obtaining composite based on AML method
Perforate compressive strength Design permissible value is it is characterised in that described composite perforate compressive strength Design permissible value test method
Comprise the steps：
Step 1：Obtain process batch factor of influence, the hygrothermal environment of composite by building block system test element level experimental stage
Factor of influence and the thickness effect factor, opening diameter factor of influence, width-diameter are than factor of influence, hole countersunk head factor of influence
With perforate compressive strength basic value；
Step 2：By the data obtaining in formula and described step 1, obtain the design of perforate composite compressive strength allowable
Value.
2. composite perforate compressive strength Design permissible value test method as claimed in claim 1 is it is characterised in that described
Step 1 is specially：The testpieces group of 3 kinds of AML values of planning, forms the first testpieces group, the second testpieces group and the 3rd test
Part group, thus obtain process batch factor of influence, hygrothermal environment factor of influence and the thickness effect factor, opening diameter impact because
Son, width-diameter are than factor of influence, hole countersunk head factor of influence and perforate compressive strength basic value.
3. composite perforate compressive strength Design permissible value test method as claimed in claim 2 is it is characterised in that described
The test of process batch factor of influence is specially：B a reference value is taken to simplify sampling test matrix form, respectively from the first testpieces group
Obtain 18 the first testpieces, obtain 18 the second testpieces, obtain 18 the from the 3rd testpieces group from the second testpieces group
Three testpieces；Every group all using 3 batch prepregs, 2 cure cycle, 18 testpieces；Hygrothermal environment, geometric parameter,
In the case of the conditions such as ply stacking-sequence are identical, process batch factor of influence C is asked for by formulaBB.
4. composite perforate compressive strength Design permissible value test method as claimed in claim 3 is it is characterised in that described
The test of hygrothermal environment factor of influence includes：
Obtain same material batch, same curing process, geometric parameter identical the first testpieces 18, the second testpieces 18
And the 3rd testpieces 18, wherein, respectively take 6 in the first testpieces, the second testpieces and the 3rd testpieces for low temperature
Dry state CTD is tested, and respectively takes 6 for the test of room temperature dry state RTD in the first testpieces, the second testpieces and the 3rd testpieces,
6 are respectively taken for high temperature hygrometric state ETW test, by described low temperature in first testpieces, the second testpieces and the 3rd testpieces
The test of dry state CTD, the test of room temperature dry state RTD and high temperature hygrometric state ETW test, are used for obtaining hygrothermal environment factor of influence CEN, institute
State hygrothermal environment factor of influence CENObtained by equation below：
CEN=Si/SRTD；Wherein,
SiAverage inefficacy strain for high temperature hygrometric state ETW or low temperature dry state CTD；
SRTDAveragely lost efficacy strain for room temperature dry state.
5. composite perforate compressive strength Design permissible value test method as claimed in claim 4 is it is characterised in that described
Thickness effect factorial experiment includes：
Same material batch, same solidification work is obtained from the first testpieces group, the second testpieces group and the 3rd testpieces group
Each 18 of the different testpieces of thickness in skill, geometric parameter, in every group of testpieces, each 6 are used for carrying out the examination of room temperature dry state RTD
Test, and thickness effect factor C is obtained by equation belowTH：
CTH=(St/S0.18)
StRepresent that each average compression failure of testpieces thickness strains；
S0.18Represent the strain of 0.18in thickness average compression failure.
6. composite perforate compressive strength Design permissible value test method as claimed in claim 5 is it is characterised in that from
Same material batch, same curing process, geometric parameters are obtained in one testpieces group, the second testpieces group and the 3rd testpieces group
Each 36 of the different testpieces of opening diameter in number, in every group of testpieces, individual 6 are used for carrying out the test of room temperature dry state RTD, and lead to
Cross equation below and obtain opening diameter factor of influence CD：
CD=(SD/S1/4)；Wherein,
SDRepresent the testpieces average compression failure strain of multiple diameter；
S1/4Represent that the average compression failure of a diameter of 1/4in testpieces strains
Same material batch, same solidification work is obtained from the first testpieces group, the second testpieces group and the 3rd testpieces group
More each than different testpieces 24 of width-diameter in skill, geometric parameter, in every group of testpieces, each 6 are used for carrying out room temperature dry state
RTD tests, and obtains width-diameter than factor of influence C by equation belowW/D：
CW/D=(SW/D/S5), wherein,
SW/DRepresent the testpieces average compression failure strain of multiple width-diameter ratio；
S5Represent the average compression failure strain than the testpieces for 5 of width-diameter；
Same material batch, same curing process, the different examination of countersunk head depth in geometric parameter is obtained from the second testpieces group
Test each 30 of part, wherein, choose 5 kinds of countersunk head specifications, every kind of specification is chosen 6 the second testpieces, is used for carrying out room temperature dry state RTD
Test, obtains hole countersunk head factor of influence C by equation belowCSK：
CCSK=(SCSK/S0)
SCSKRepresent the testpieces average compression failure strain of multiple hole countersunk head depth；
S0Represent that the average compression failure of non-counter sink testpieces strains.
7. composite perforate compressive strength Design permissible value test method as claimed in claim 6 is it is characterised in that obtain
Same material batch, same curing process, geometric parameter identical the first testpieces 6, the second testpieces 6 and the 3rd examination
Test part 6, wherein, the first testpieces is used for low temperature dry state CTD to be tested, and the second testpieces is used for room temperature dry state RTD to be tested, the 3rd
Testpieces is used for high temperature hygrometric state ETW to be tested, and is tested by described low temperature dry state CTD, room temperature dry state RTD is tested and high temperature hygrometric state
ETW tests, and is used for obtaining perforate compressive strength basic value SBASE.
8. composite perforate compressive strength Design permissible value test method as claimed in claim 7 is it is characterised in that described
Formula in step 2 is：
SOHC-ALL=SBASE*CBB*CEN*CTH*CD*CW/D*CCSK[με]；Wherein,
SOHC-ALLFor perforate composite compressive strength Design permissible value；
SBASEFor perforate compressive strength basic value SBASE；
CBBFor process batch factor of influence；
CENFor hygrothermal environment factor of influence；
CTHFor the thickness effect factor；
CDFor opening diameter factor of influence；
CW/DCompare factor of influence for width-diameter；
CCSKFor hole countersunk head factor of influence.
9. composite perforate compressive strength Design permissible value test method as claimed in claim 2 is it is characterised in that described
The AML value of the first testpieces group is -28, and the AML value of described second testpieces group is 0, and the AML value of described 3rd testpieces group is
25.
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