CN105954103B - Ground surface material stretching, compression, curved drawing modulus of resilience synchronous testing device and method - Google Patents

Ground surface material stretching, compression, curved drawing modulus of resilience synchronous testing device and method Download PDF

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CN105954103B
CN105954103B CN201610462635.2A CN201610462635A CN105954103B CN 105954103 B CN105954103 B CN 105954103B CN 201610462635 A CN201610462635 A CN 201610462635A CN 105954103 B CN105954103 B CN 105954103B
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test specimen
test
load
modulus
strain
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CN201610462635.2A
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CN105954103A (en
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吕松涛
郑健龙
陈杰东
黄拓
杨明
田双喜
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长沙理工大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0017Tensile
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0023Bending
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants

Abstract

The invention discloses a kind of stretching of ground surface material, compression, curved drawing modulus of resilience synchronous testing device and methods, resistance strain gage is sticked respectively on the upper and lower surface of test specimen span centre, after the compressive strain and stretching strain that measure test specimen, the amount of deflection in girder span is measured using displacement sensor, substitutes into curved drawing, stretching and compression modulus test result that formula can be obtained material.Three kinds of modulus of material can be measured simultaneously by once testing using this method, improve the accuracy and test efficiency of ground surface material modulus test, the cost of laboratory test test is reduced, and accurate design parameter can be provided for the perpetual pavement scientific design of the drawing of consideration material, pressing mold amount difference.

Description

Ground surface material stretching, compression, curved drawing modulus of resilience synchronous testing device and method

Technical field

The present invention relates to field of road Load materials modulus indoor test technical method more particularly to semi-rigid type bases The stretching of material and asphalt beam, compression, curved retract play modulus test device and method.

Background technology

China's Analyzing Design Procedures for Asphalt Pavement is managed using the Elastic Layered System of the structural material assumption of isotropy at this stage By in Pavement Structure Design simply using no lateral spacing compression rebound modulu as design parameter.However proved through a large number of experiments, Road semi-rigid sub-base material and asphalt show to draw, the anisotropic properties of pressing mold amount not etc., and general resistance to compression Modulus is much larger than tensile modulus.In the actual loading of road surface structare layer, Tension Stress Zone and compression area are generally existed simultaneously, especially It is the semi-rigid type base using Cement Treated Material, is typically in upper portion pressurized, the stress state of lower tension.Therefore When carrying out road surface Mechanics Calculation simply using larger compression rebound modulu as design on material structure parameter, height will be caused Estimate the mechanical property of ground surface material, so that there are large errors for design calculation result, it is relatively dangerous, seriously affect reality The performance and service life on road surface.

The test method of material modulus in existing ground surface material testing regulations, mainly there is compression rebound modulu test, splitting The modulus of resilience is tested, curved to retract bullet modulus test.Compression rebound modulu test is broadly divided into top surface method or loading plate method, both It is to be tested under the unidirectional pressured state of no lateral spacing;Split resilient modulus is a kind of Indirect Tensile Tests, stress state with Road surface structare layer true stress state is closer to;And it is curved retract bullet modulus test, although it is contemplated that pavement structure layer material It is practically in upper portion pressurized, the stress state of lower tension, but the theory that modulus calculates is identical based on mixture drawing, pressing mold amount It is assumed that and do not account for influence of the shear action to amount of deflection, cause calculated bending rollering modulus error larger, cannot be accurately The true mechanical property of reaction material.In addition, three kinds of modulus can only be by making the test specimen of different shape and size and dividing respectively Do not tested and obtained accordingly, cause the resources such as material, manpower waste and test result there are larger errors, in turn Modulus test result is caused to be unable to the non-deformability of objective reality reflection material or structure.

Based on this, on the basis of present invention bending rollering modulus computational theory as defined in current specifications and test method, develop A kind of synchronism detection ground surface material stretch modulus, the pilot system of compression modulus, bending rollering modulus, and be deduced stretch modulus, Compression modulus and the bending rollering modulus computation model for considering shearing effect influence.To establish the sheet for considering that material is drawn, pressing mold amount is different Structure relationship, and then the road surface mechanical analysis for carrying out precision provides parameter foundation, to saving ground surface material laboratory test cost, The precision for improving the accuracy and test efficiency of ground surface material modulus test, and then improving asphalt pavement structure design has important Meaning.

Invention content

In view of the deficiencies of the prior art, the present invention is intended to provide one kind can simultaneously be surveyed under ground surface material true stress state The test device and test method for measuring material static or dynamic tensile modulus, compression modulus, bending rollering modulus, to obtain road surface material Expect that the stretch modulus under true stress state, compression modulus, bending rollering modulus improve China to preferably instruct engineering practice The precision of Pavement Structure Design.

To achieve the goals above, the present invention adopts the following technical scheme that:

Ground surface material is stretched, is compressed, curved drawing modulus of resilience synchronous testing device, including test specimen, which is characterized in that including:

MTS multifunctional materials test system:For carrying out four-point bending load to test specimen;

Movable support:The both ends of the test specimen are placed when for loading;

Strain acquisition system:Including at least four foil gauges, two of which foil gauge is for being affixed on test specimen upper surface midpoint And the compressive strain of test specimen upper surface is acquired, another two foil gauge is for being affixed on test specimen lower surface midpoint and acquiring test specimen lower surface Stretching strain;

Displacement sensor:It is set up in the middle part of test specimen, for testing mid-span deflection;

Strain acquirement instrument:It is electrically connected in all foil gauges;

Processing terminal:It is electrically connected in institute's displacement sensors and strain acquirement instrument.

It stretched, compressed using the ground surface material of above-mentioned apparatus, curved drawing static resilient modulus synchronous detecting method includes as follows Step:

After test specimen is made in S1, test specimen is put into MTS multifunctional material test systems, and the both ends of test specimen are respectively placed in In one movable support;

S2 applies concentrfated load P using MTS multifunctional materials test system, then acts at three branch of test specimen upper surface and add Symmetrical concentrfated load in carrier head is P/2, then test specimen is in four-point bending state, and pure bending state is in the middle part of test specimen;

Upper and lower surfaces of the S3 at test specimen midpoint sticks foil gauge respectively, and the pressure of test specimen upper surface is acquired by strain acquirement instrument The stretching strain of strain and lower surface;Displacement sensor is set up at test specimen midpoint simultaneously, measures the mid-span deflection of test specimen;

The upper and lower table at the test specimen midpoint that the mid-span deflection and foil gauge that S4 processing terminals are measured according to displacement sensor measure Face strain data calculates the test specimen stretch modulus E of test specimen according to the following formulat, Modulus of pressure EcAnd bending rollering modulus Ef

Wherein, P is the load that step S2 applies, and L, b, h are respectively the length of test specimen;εtIt is strained for step S3 The stretching strain for the test specimen lower surface that piece measures;εcFor the compressive strain for the test specimen upper surface that foil gauge in step S3 measures;δ ' is step The mid-span deflection that displacement sensor measures in rapid S3, μ indicate Poisson's ratio.

It should be noted that in step S1, ensure load side when test specimen is placed in MTS multifunctional material test systems To consistent with pressure direction when specimen molding, and test specimen two ends are individually placed to carry out freely-supported support in movable support;It is trying At the bearing load of part and movable support upper end is coated with suitable vaseline.

It should be noted that step S3's specifically includes:

3.1) system is tested by displacement-control mode first to intend the half of the maximum load applied by MTS multifunctional materials Loading and unloading pre-compression test twice is carried out, the load top plate of MTS multifunctional materials test system is made to be in close contact with surface of test piece;

3.2) 200 loads, the unloading carried out respectively under different loading frequencies recycles, wherein load maximum value PmaxIt takes 30% test specimen breakdown strength, load minimum value PminTake 10% load maximum value Pmax, i.e. load cycle specificity value P0= Pmin/Pmax=0.1;

3.3) load, unload cyclic process whole process by strain acquirement instrument record test specimen span centre upper surface compressive strain and under The variation of the stretching strain on surface, while experiment test specimen mid-span deflection variation is recorded by displacement sensor.

A kind of ground surface material using above-mentioned apparatus is stretched, is compressed, curved pulling state modulus of resilience synchronous detecting method, including Following steps:

After test specimen is made in S1, test specimen is put into MTS multifunctional material test systems, and the both ends of test specimen are respectively placed in In one movable support;

S2 applies concentrfated load P using MTS multifunctional materials test system dynamic, and the load waveform of application is haversine Wave, then it is P/2 to act on the symmetrical concentrfated load at three branch of test specimen upper surface on loading head, then test specimen is in four-point bending shape State, and pure bending state is in the middle part of test specimen;

Upper and lower surfaces of the S3 at test specimen midpoint sticks foil gauge respectively, and the pressure of test specimen upper surface is acquired by strain acquirement instrument The stretching strain of strain and lower surface;Displacement sensor is set up at test specimen midpoint simultaneously, measures the mid-span deflection of test specimen;

The upper and lower table at the test specimen midpoint that the mid-span deflection and foil gauge that S4 processing terminals are measured according to displacement sensor measure Face strain data calculates the test specimen stretch modulus E of test specimen according to the following formulat, Modulus of pressure EcAnd bending rollering modulus Ef

Wherein, P is the load that step S2 applies, and L, b, h are respectively the length of test specimen;εtIt is strained for step S3 The stretching strain for the test specimen lower surface that piece measures;εcFor the compressive strain for the test specimen upper surface that foil gauge in step S3 measures;δ ' is step The mid-span deflection that displacement sensor measures in rapid S3, μ indicate Poisson's ratio.

It should be noted that in step S1, ensure load side when test specimen is placed in MTS multifunctional material test systems To consistent with pressure direction when specimen molding, and test specimen two ends are individually placed to carry out freely-supported support in movable support;It is trying At the bearing load of part and movable support upper end is coated with suitable vaseline.

It should be noted that step S3's specifically includes:

3.1) system is tested by displacement-control mode first to intend the half of the maximum load applied by MTS multifunctional materials Loading and unloading pre-compression test twice is carried out, the load top plate of MTS multifunctional materials test system is made to be in close contact with surface of test piece;

3.2) 200 loads, the unloading carried out respectively under different loading frequencies recycles, wherein load maximum value PmaxIt takes 30% test specimen breakdown strength, load minimum value PminTake 10% load maximum value Pmax, i.e. load cycle specificity value P0= Pmin/Pmax=0.1;

3.3) load, unload cyclic process whole process by strain acquirement instrument record test specimen span centre upper surface compressive strain and under The variation of the stretching strain on surface, while experiment test specimen mid-span deflection variation is recorded by displacement sensor;

3.4) peak load of continuous 10 load waveforms and most is taken in whole last 1 second of load, unloading cyclic process 10 load differences and deformation difference are taken mean value, carry out step S4 by small load, and corresponding maximum distortion and minimal deformation Calculating.

The beneficial effects of the present invention are:

The present invention tests system using MTS multifunctional materials and carries out four-point bending load test to test specimen, is considering test specimen On the basis of the shear-deformable simple bending section deflection to span centre in both ends, the bending rollering modulus calculation formula in current specifications is had modified, Assume simultaneously according to the cross section of test specimen and draw, the bilinearity of pressing mold amount difference is it is assumed that derive ground surface material test specimen four Stretch modulus when point bending load and compression modulus calculation formula.

Device and method through the invention can disposably measure the semi-rigid type base under the true stress state of road surface Bending rollering modulus either statically or dynamically, stretch modulus and the compression modulus of material or bitumen mixture specimen.

Description of the drawings

Fig. 1 is the test system elevation in the embodiment of the present invention;

Fig. 2 is the beam sample dimensions schematic diagram in the embodiment of the present invention.

Fig. 3 is the elevation of the patch foil gauge beam test specimen in the embodiment of the present invention.

Fig. 4 is the vertical view of the patch foil gauge beam test specimen in the embodiment of the present invention.

Fig. 5 is the force simplified figure that formula of modulus of the present invention derives.

Specific implementation mode

Below with reference to attached drawing, the invention will be further described, it should be noted that the present embodiment is with this technology side Premised on case, detailed embodiment and specific operating process are given, but protection scope of the present invention is not limited to this reality Apply example.

As shown in Figure 1, a kind of ground surface material is stretched, is compressed, curved drawing modulus of resilience synchronous testing device, including test specimen 1, separately Further include outside:

MTS multifunctional materials test system 3:For carrying out four-point bending load to test specimen 1;

Movable support 7:The both ends of the test specimen are placed when for loading;

Strain acquisition system:Including at least four foil gauges 2, two of which foil gauge is for being affixed in 1 upper surface of test specimen The compressive strain of test specimen upper surface is put and acquires, another two foil gauge is for being affixed on 1 lower surface midpoint of test specimen and acquiring test specimen following table The stretching strain in face;

Displacement sensor 8:It is set up in 1 middle part of test specimen, the mid-span deflection for testing test specimen;

Strain acquirement instrument 5:It is electrically connected in all foil gauges;

Processing terminal 6:It is electrically connected in institute's displacement sensors 8 and strain acquirement instrument 5.

Ground surface material stretching, compression, curved drawing static resilient modulus synchronous detecting method are carried out including such as using above-mentioned apparatus Lower step:

After test specimen is made in S1, test specimen is put into MTS multifunctional material test systems, and the both ends of test specimen are respectively placed in In one movable support;

S2 applies concentrfated load P using MTS multifunctional materials test system 3, then acts at three branch of test specimen upper surface Symmetrical concentrfated load on loading head is P/2, and test specimen forms four-point bending structure, makes to be in pure bending state in the middle part of test specimen;

S3 sticks foil gauge respectively at the midpoint of the upper and lower surface at test specimen midpoint, and test specimen upper table is acquired by strain acquirement instrument The compressive strain in face and the stretching strain of lower surface;Displacement sensor is set up at test specimen midpoint simultaneously, measures the mid-span deflection of test specimen;

The upper and lower table at the test specimen midpoint that the mid-span deflection and foil gauge that S4 processing terminals are measured according to displacement sensor measure Face strain data calculates the test specimen stretch modulus E of test specimen according to the following formulat, Modulus of pressure EcAnd bending rollering modulus Ef

Wherein, P is the load applied, and L, b, h are respectively the length of test specimen;εtIt is measured for step S3 foil gauges Test specimen lower surface stretching strain;εcFor the compressive strain for the test specimen upper surface that foil gauge in step S3 measures;δ ' is in step S3 The mid-span deflection that displacement sensor measures, μ indicate Poisson's ratio.

It should be noted that in step S1, ensure load side when test specimen is placed in MTS multifunctional material test systems To consistent with pressure direction when specimen molding, and test specimen two ends are individually placed to carry out freely-supported support in movable support;It is trying At the bearing load of part and movable support upper end is coated with suitable vaseline.

It should be noted that step S3's specifically includes:

3.1) system is tested by displacement-control mode first to intend the half of the maximum load applied by MTS multifunctional materials Loading and unloading pre-compression test twice is carried out, the load top plate of MTS multifunctional materials test system is made to be in close contact with surface of test piece;

3.2) 200 loads, the unloading carried out respectively under different loading frequencies recycles, wherein load maximum value PmaxIt takes 30% test specimen breakdown strength, load minimum value PminTake 10% load maximum value Pmax, i.e. load cycle specificity value P0= Pmin/Pmax=0.1;

3.3) load, unload cyclic process whole process by strain acquirement instrument record test specimen span centre upper surface compressive strain and under The variation of the stretching strain on surface, while experiment test specimen mid-span deflection variation is recorded by displacement sensor.

Furthermore it is also possible to carry out ground surface material stretching, compression, the same pacing of the curved pulling state modulus of resilience using above-mentioned apparatus Examination, method is stretched with above-mentioned ground surface material, is compressed, curved drawing static resilient modulus synchronous detecting method is essentially identical, the main distinction It is in step S2, applies load p in dynamic set using MTS multifunctional materials test system 3, then act on test specimen upper surface three Dynamic load is P/2 in symmetric set at branch on loading head, forms four-point bending structure, makes to be in pure bending shape in the middle part of test specimen When state, by the way of dynamic load.And in step S3, answered in the pressure for recording test specimen span centre upper surface by strain acquirement instrument Become and lower surface stretching strain variation, while by displacement sensor record experiment test specimen mid-span deflection variation after, take plus It carries, the peak load of continuous 10 load waveforms and minimum load in last 1 second that unloading cyclic process is whole, and corresponding 10 load differences and deformation difference are taken mean value, carry out the calculating of step S4 by maximum distortion and minimal deformation.

Below to test specimen bending rollering modulus Ef, Modulus of pressure EcAnd stretch modulus EtThe derivation of calculating formula make into one Step ground explanation.It is as shown in Figure 5 to calculate schematic diagram.

Based on test specimen drawing, under pressing mold amount same case, bending rollering modulus can be acquired.From the mechanics of materials:Test specimen across Middle moment of inertia of cross-section Iz, moment M and direct stress σ and cross section bottom maximum stretching strain εmaxRespectively:

Y is that point is calculated on test specimen cross-sectional height direction to the distance of test specimen neutral surface in formula (3).δ is span centre in formula (4) Amount of deflection.Simultaneous formula (1), (2), (3) and (4), which can obtain, does not consider that the bending rollering modulus E that shearing effect influences is:

The mid-span deflection δ ' measured due to displacement sensor is calculated by the shear-deformable influence of test specimen two ends shearind section Bending rollering modulus EfWhen should substitute into true sag δ, i.e.,:

δ=δ '-Δs δ (6)

Wherein Δ δ is the shear-deformable influence amount to degree of disturbing of test specimen two ends shearind section, by the mechanics of materials:

And being defined by shear-deformable γ can obtain:

It is Q shear stress in formula (8), G is modulus of shearing.Δ δ can be obtained by (7) (8):

Simultaneous formula (5) (6) (9), obtains test specimen bending rollering modulus EfFinally expression formula is:

It is drawn based on test specimen, under pressing mold amount different situations, then can obtain the stretch modulus and compression modulus of material.If simple bending tune The compressional zone height of test specimen cross section is h1, drawing zone height is h2, then

h1+h2=h (11)

And assume that the modulus of material is bilinearity, i.e., it is linear elasticity in compressional zone and drawing zone material, then transversal face pressure is answered Power σc(y) and tensile stress sigmat(y) meet:

By section equilibrium equation and moment of flexure equilibrium equation:

It can acquire, compression stress ot on cross sectionc(y) and tensile stress sigmat(y) it is respectively:

Then cross-sectional top compressive strain ε in the girder span measured by foil gaugecWith bottom stretching strain εt, and the company by straining Continuous property can obtain:

It can then be obtained by formula (11) and (18):

Semi-rigid sub-base material then finally can be obtained by formula (2), (16), (17), (19) and (20) or asphalt tries The stretching of part, modulus of elasticity in comperssion Et、EcRespectively:

Embodiment one

Now the present invention is further illustrated by taking Cement Stable Macadam Mixture central sill test specimen as an example.

1) in strict accordance with《Highway engineering stabilized with inorganic binder testing of materials regulation》T0844-2009 methods prepare size For the central sill test specimen 1 of 100mm × 100mm × 400mm, as shown in Figure 2.Health is carried out according to T0845-2009 Standard Curing methods 90 days.

2) test specimen is pasted at foil gauge 2 and carries out cover with cement mortar at freely-supported and squeegeeed, glued foil gauge 2 with seccotine The upper and lower surface of 1 span centre of upper beam test specimen pays attention to the stickup of conducting wire, and spacing distance is big as possible, in case test piece deformation is led when test Short circuit is caused, then by conducting wire and 4 electric welding connection of electric wire, as shown in Figure 3 and Figure 4.

4) test specimen is placed in MTS Material Testing Machine, ensures that load direction is consistent with pressure direction when specimen molding, Both ends are placed on progress freely-supported support in movable support 7, apply concentrfated load P using MTS multifunctional materials test system 3, then It is P/2 to act on the symmetrical concentrfated load at three branch of test specimen upper surface on loading head, forms four-point bending structure, makes beam test specimen 1 span centre is in pure bending stress state;At the bearing load of beam test specimen 1 and 7 upper end of movable support be coated with it is suitable all Intellectual circle acts on lateral shear caused by beam test specimen 1 with mobile support saddle 7 with reducing load top plate, to reduce examination to greatest extent Test error.

5) beam test specimen span centre set up displacement sensor 8, with for measure beam test specimen 1 mid-span deflection change;It is more by MTS Functional material tests the half progress loading and unloading precompressed twice that system 3 first intends the maximum load applied by displacement-control mode Experiment makes load top plate be in close contact with surface of test piece.Then 200 loads, the unloading under different loading frequencies are carried out respectively Cycle, wherein load maximum value PmaxTake 30% test specimen breakdown strength, load minimum value PminTake 10% load maximum value Pmax, i.e., Load cycle specificity value P=Pmin/Pmax=0.1;Load, unloading cyclic process whole process record beam test specimen by strain acquirement instrument 5 Span centre strain variation upper and lower surfaces of, while the variation of beam test specimen mid-span deflection is recorded by displacement sensor 8;It is taken most when calculating The peak load of continuous 10 load waveforms and minimum load in 1 second afterwards, and corresponding maximum distortion and minimal deformation, by 10 A load difference and deformation difference bring formula (10), (21), (22) into after taking mean value, are respectively used to calculate three kinds of dynamic modulus.

By above-mentioned steps, the cement stabilized macadam central sill under the true stress state of road surface can be disposably measured Dynamic tensile, compression, bending rollering modulus.In the present embodiment, by taking 10Hz loading frequencies as an example, the data measured are as follows:

L=300mm, b=100mm, h=100mm, μ=0.25, δ '=0.0163mm, P=0.557KN, εc=7.04 (microstrain 10-6), εt=9.77 (microstrains 10-6)。

Test specimen dynamic bending rollering modulus E can be obtained in substitution formula (10), (21) and (22)fAnd Modulus of pressure EcStretch modulus EtPoint It is not:

For those skilled in the art, it can be made various corresponding according to above technical solution and design Change and distortion, and all these change and distortions should be construed as being included within the protection domain of the claims in the present invention.

Claims (11)

1. a kind of ground surface material is stretched, is compressed, curved drawing static resilient modulus synchronous detecting method, which is characterized in that including as follows Step:
After test specimen is made in S1, test specimen is put into MTS multifunctional material test systems, and the both ends of test specimen are respectively placed in one In movable support;
S2 applies concentrfated load P using MTS multifunctional materials test system, then acts at three branch of test specimen upper surface and load Symmetrical concentrfated load on head is P/2, then test specimen is in four-point bending state, and pure bending state is in the middle part of test specimen;
Upper and lower surfaces of the S3 at test specimen midpoint sticks foil gauge respectively, and the pressure that test specimen upper surface is acquired by strain acquirement instrument is answered Become the stretching strain with lower surface;Displacement sensor is set up at test specimen midpoint simultaneously, measures the mid-span deflection of test specimen;
The upper and lower surface at the test specimen midpoint that the mid-span deflection and foil gauge that S4 processing terminals are measured according to displacement sensor measure Strain data calculates the test specimen stretch modulus E of test specimen according to the following formulat, Modulus of pressure EcAnd bending rollering modulus Ef
Wherein, P is the concentrfated load that step S2 applies, and L, b, h are respectively the length of test specimen;εtIt is surveyed for step S3 foil gauges The stretching strain of the test specimen lower surface obtained;εcFor the compressive strain for the test specimen upper surface that foil gauge in step S3 measures;δ ' is step S3 The mid-span deflection that middle displacement sensor measures, μ indicate Poisson's ratio.
2. according to the method described in claim 1, it is characterized in that, in step S1, test specimen is placed in MTS multifunctional materials and is surveyed Ensure that loading direction is consistent with the pressure direction when specimen molding when on test system, and test specimen two ends are individually placed to movable support Upper progress freely-supported support;Test specimen bear at load and movable support upper end is coated with suitable vaseline.
3. according to the method described in claim 1, it is characterized in that, step S3's specifically includes:
3.1) system is tested by MTS multifunctional materials first to carry out with the half for intending the maximum load applied by displacement-control mode Loading and unloading pre-compression test twice makes the load top plate of MTS multifunctional materials test system be in close contact with surface of test piece;
3.2) 200 loads, the unloading carried out respectively under different loading frequencies recycles, wherein Maximal loading PmaxTake 30% Test specimen breakdown strength, load minimum value PminTake 10% Maximal loading Pmax, i.e. load cycle characteristic value P0=Pmin/Pmax= 0.1;
3.3) it loads, unload compressive strain and lower surface that cyclic process whole process records test specimen span centre upper surface by strain acquirement instrument Stretching strain variation, while pass through displacement sensor record experiment test specimen mid-span deflection variation.
4. a kind of ground surface material is stretched, is compressed, curved pulling state modulus of resilience synchronous detecting method, which is characterized in that including as follows Step:
After test specimen is made in S1, test specimen is put into MTS multifunctional material test systems, and the both ends of test specimen are respectively placed in one In movable support;
S2 applies concentrfated load P using MTS multifunctional materials test system dynamic, and the load waveform of application is haversine wave, then It is P/2 to act on the symmetrical concentrfated load at three branch of test specimen upper surface on loading head, then test specimen is in four-point bending state, and Pure bending state is in the middle part of test specimen;
Upper and lower surfaces of the S3 at test specimen midpoint sticks foil gauge respectively, and the pressure that test specimen upper surface is acquired by strain acquirement instrument is answered Become the stretching strain with lower surface;Displacement sensor is set up at test specimen midpoint simultaneously, measures the mid-span deflection of test specimen;
The upper and lower surface at the test specimen midpoint that the mid-span deflection and foil gauge that S4 processing terminals are measured according to displacement sensor measure Strain data calculates the test specimen stretch modulus E of test specimen according to the following formulat, Modulus of pressure EcAnd bending rollering modulus Ef
Wherein, P is the concentrfated load that step S2 applies, and L, b, h are respectively the length of test specimen;εtIt is surveyed for step S3 foil gauges The stretching strain of the test specimen lower surface obtained;εcFor the compressive strain for the test specimen upper surface that foil gauge in step S3 measures;δ ' is step S3 The mid-span deflection that middle displacement sensor measures, μ indicate Poisson's ratio.
5. according to the method described in claim 4, it is characterized in that, in step S1, test specimen is placed in MTS multifunctional materials and is surveyed Ensure that loading direction is consistent with the pressure direction when specimen molding when on test system, and test specimen two ends are individually placed to movable support Upper progress freely-supported support;Test specimen bear at load and movable support upper end is coated with suitable vaseline.
6. according to the method described in claim 4, it is characterized in that, step S3's specifically includes:
3.1) system is tested by MTS multifunctional materials first to carry out with the half for intending the maximum load applied by displacement-control mode Loading and unloading pre-compression test twice makes the load top plate of MTS multifunctional materials test system be in close contact with surface of test piece;
3.2) 200 loads, the unloading carried out respectively under different loading frequencies recycles, wherein Maximal loading PmaxTake 30% Test specimen breakdown strength, load minimum value PminTake 10% Maximal loading Pmax, i.e. load cycle characteristic value P0=Pmin/Pmax= 0.1;
3.3) it loads, unload compressive strain and lower surface that cyclic process whole process records test specimen span centre upper surface by strain acquirement instrument Stretching strain variation, while pass through displacement sensor record experiment test specimen mid-span deflection variation;
3.4) it takes load, unload the maximum load of continuous 10 load waveforms and minimum load in last 1 second of cyclic process whole process 10 load differences and deformation difference are taken mean value, carry out the meter of step S4 by lotus, and corresponding maximum distortion and minimal deformation It calculates.
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