CN111855413A - Tensile-bending coupling strength test system for composite material fan blade root element grade test sample - Google Patents

Tensile-bending coupling strength test system for composite material fan blade root element grade test sample Download PDF

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Publication number
CN111855413A
CN111855413A CN202010799404.7A CN202010799404A CN111855413A CN 111855413 A CN111855413 A CN 111855413A CN 202010799404 A CN202010799404 A CN 202010799404A CN 111855413 A CN111855413 A CN 111855413A
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CN
China
Prior art keywords
module
load
sample
tenon
tensile
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Pending
Application number
CN202010799404.7A
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Chinese (zh)
Inventor
陈勇
龙智星
张煜坤
唐旭
张继国
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Shanghai Jiao Tong University
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Shanghai Jiao Tong University
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Priority to CN202010799404.7A priority Critical patent/CN111855413A/en
Publication of CN111855413A publication Critical patent/CN111855413A/en
Pending legal-status Critical Current

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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
    • G01N3/02Details
    • 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
    • G01N3/02Details
    • G01N3/04Chucks
    • 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
    • G01N2203/0001Type of application of the stress
    • G01N2203/0003Steady
    • 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
    • G01N2203/0023Bending
    • 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
    • G01N2203/0014Type of force applied
    • G01N2203/0026Combination of several types of applied 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
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means
    • 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
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/04Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0423Chucks, fixtures, jaws, holders or anvils using screws
    • 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
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/04Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0482Chucks, fixtures, jaws, holders or anvils comprising sensing means
    • 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
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0676Force, weight, load, energy, speed or acceleration

Abstract

A system for testing the pull-bend coupling strength of a composite fan blade root element grade specimen, comprising: the bending moment loading module is fixedly connected with the supporting module, a load is applied by the bending moment loading module to simulate the load of a reduction sample under an actual working condition, the supporting module applies a tensile load simulating a centrifugal load to the sample through the tensile clamp module, and the limiting module limits the whole tenon not to deflect in the bending moment loading process and avoids the influence of extra bending moment caused by tensile eccentricity. The invention combines the load condition of the blade under the actual working condition, applies load to the sample through the matched clamp of the sample, and simulates the load under the actual working condition so as to verify the size of the breaking load of the sample and the breaking mode. The device can accurately measure and control the applied load, and can meet the requirement of strength test on the composite fan blade root element-level test sample.

Description

Tensile-bending coupling strength test system for composite material fan blade root element grade test sample
Technical Field
The invention relates to a technology in the field of physical detection of materials, in particular to a system for testing the pull-bend coupling strength of a composite fan blade root element-level sample.
Background
The fan blade is one of the important parts at the front end of the large bypass ratio fan engine, and the mass of the fan blade influences the efficiency of the large bypass ratio turbofan aircraft engine. There is a trend toward lighter weight composite fan blades with reduced mass, and the use of composite materials is the only way to achieve higher bypass ratios and reduced weight in engines. The composite material fan blade formed by the prepreg/autoclave technology is formed by laminating, laying, pressurizing and curing hundreds of layers of carbon fiber prepregs, and because of the structural characteristic of the laminated structure, the strength among layers of the laminated composite material structure is low, and the most main failure mode is interlayer separation. Therefore, the laminated composite material blade is sensitive to bending moment caused by aerodynamic load, and it is necessary to verify whether the fan blade is structurally damaged due to interlayer separation under the combined action of the aerodynamic load and the centrifugal load.
The performance characterization of the composite material is complex, the composite material fan blade can be put into use only through building block verification, the material performance is established through material testing, the design value is established through component testing, the test content is simplified to be complex, and finally the designed structural performance is analyzed and verified. The element level test is one of the important links of the building block type test and is an important bridge between the test of the connecting material and the test of the full-size component. The element-level sample completely retains the design characteristics of a research part, simplifies a secondary part, can obviously reduce the cost of multiple batches of tests compared with a full-size test, and has guiding significance on the design optimization of a full-size part according to an analysis result.
The verification of the component-level test specimen requires a reasonably designed experimental scheme and equipment that can be used for the verification of the component-level test specimen. The tenon three-dimensional modeling is complex, belongs to a non-standard sample, and is not used for equipment for strength verification of a blade root tenon element level sample at present. Therefore, the development of the pull-bend coupling strength test system for the composite fan blade root element grade test sample has very important engineering and practical values for the development of the domestic composite fan blade.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a system for testing the tension-bending coupling strength of a composite fan blade root element-level sample, which applies a load to the sample through a matched sample clamp by combining the load condition of the blade under the actual working condition so as to simulate the load under the actual working condition and verify the size of the breaking load of the sample and the breaking mode. The device can accurately measure and control the applied load, and can meet the requirement of strength test on the composite fan blade root element-level test sample.
The invention is realized by the following technical scheme:
the invention relates to a system for testing the pull-bend coupling strength of a composite fan blade root element level sample, which comprises the following components: moment of flexure load module, supporting module, tenon anchor clamps module, tensile anchor clamps module and spacing module, wherein: the bending moment loading module is fixedly connected with the supporting module, the bending moment loading module applies load to simulate the load of the reduction sample under actual working conditions, the supporting module applies tensile load simulating centrifugal load to the sample through the tensile clamp module, and the limiting module limits the whole tenon to not deflect in the bending moment loading process and avoids the influence of extra bending moment caused by tensile eccentricity.
The bending moment loading module comprises: pneumatic cylinder and pneumatic cylinder mounting bracket and hydraulic system, wherein: the hydraulic cylinder is arranged on the hydraulic cylinder mounting frame, and the hydraulic system forms a hydraulic loop through an oil outlet and an oil inlet of the hydraulic cylinder to apply load.
The support module comprises: system base, bearing assembly and installation axle, wherein: the installation axle sets up on the system base and through fastening bolt and stretcher fixed connection, and the bearing assembly sets up on the system base through the bolt.
The bearing assembly comprises: self-aligning roller bearing and bearing frame, wherein: and the bearing seat is provided with a through hole and a positioning hole, and is connected with the system base of the supporting module through a bolt and a positioning pin.
And the system base is provided with a unthreaded hole and a positioning pin hole for mounting a bolt, and is used for determining the relative positions of other parts.
The tenon clamp module comprises: force sensor, tenon anchor clamps, connecting rod, flange and rotation axis, wherein: one end of the connecting rod is fixedly connected with the tenon fixture, the force sensor is arranged at the other end of the connecting rod, and the rotating shaft is connected with the end face of the tenon fixture through the bearing and the flange, so that the rotating requirement of the tenon fixture is met.
The tenon fixture is provided with a mortise matched with the shape of the blade root and used for clamping the tenon section of the sample to be tested.
The rotating shaft is of a stepped shaft structure and is used for connecting the supporting module and releasing the rotational freedom of the sample to be tested around the rotating center at the tenon section.
The stretch clip module includes: drag hook, crossbeam pull rod, blade anchor clamps and stopper, wherein: the drag hook top links to each other with stretcher loading end, and leaf body anchor clamps and the appearance piece fixed connection that awaits measuring, appearance piece and leaf body anchor clamps fixed connection that await measuring, stopper are fixed to be set up in leaf body anchor clamps, and the force sensor of stopper stress surface and spacing module contacts in order to restrict the rotation of sample, and crossbeam pull rod both ends are respectively through nut and leaf body anchor clamps fixed connection.
The shape of the blade clamp is matched with the geometric shape of the blade section part of the sample to be tested after being processed,
the blade clamp is connected with a sample to be tested by adopting double rows of bolts, and the load is transferred to the sample to be tested by the bolts.
The spacing module include: force transducer and spacing, wherein: the force sensor is arranged on the side end face of the limiting bracket to monitor the counterforce generated at the limiting block of the tensile clamp module after the tenon sample piece applies bending moment and provide certain counterforce to the tenon tensile module, so that the tensile module is kept centered.
Drawings
FIG. 1 is a block diagram of a system for testing the pull-bend coupling strength of a composite fan blade root element grade specimen;
FIG. 2 is a schematic view of a system for testing the pull-bend coupling strength of a composite fan blade root element grade specimen;
in the figure: the device comprises a mounting shaft 1, a system base 2, a tenon clamp 3, a tenon sample piece 4, a beam pull rod 5, a blade clamp 6, a drag hook 7, a limiting block 8, a limiting frame 9 containing a force sensor, a hydraulic cylinder 10, a hydraulic cylinder mounting frame 11 and a connecting rod 12 containing the force sensor;
FIG. 3 is a schematic view of a bearing assembly;
in the figure: a rotating shaft 13, a bearing seat 14, a bearing 15 and a flange 16;
FIG. 4 is a schematic diagram of the systems of the pull-bend coupling strength test system for a composite fan blade root element grade specimen,
in the figure: the device comprises a bending moment loading module A, a supporting module B, a tenon clamp module C, a stretching clamp module D and a limiting module E;
fig. 5 is a graph showing the results of experimental data, i.e. the relationship between the bending moment M and the rotation angle θ of the sample under different tensile loads T.
Detailed Description
As shown in fig. 4, the system for testing the pull-bend coupling strength of a test sample at a blade root element level of a composite fan blade according to the embodiment includes: the device comprises a bending moment loading module A, a supporting module B, a tenon clamp module C, a stretching clamp module D and a limiting module E.
As shown in fig. 2, the bending moment loading module a includes: a hydraulic cylinder 10 and a cylinder mounting 11 and a hydraulic system.
The supporting module B comprises: system base 2, bearing assembly and installation axle 1.
The tensile clamp module D comprises: a drag hook 7, a beam pull rod 5, a blade body clamp 6 and a limiting block 8.
Spacing module E include: a spacing frame 9 containing a second force sensor.
As shown in fig. 2 and 3, the tenon jig module C includes: force sensor, tenon clamp 3, link 12 containing the first force sensor, flange and rotation shaft 13.
In order to ensure the stability of the whole testing device, the system base 2 is connected to a standard base of the tensile testing machine through the mounting shaft 1, and the diameter of a through hole of the mounting shaft 1 is consistent with that of the through hole of the standard base.
One end of the connecting rod 12 is connected with the tenon clamp 3 through a bolt, the other end of the connecting rod is provided with a first force sensor, in the test, the first force sensor is selected according to the test requirement, and then the design of the connecting part of the long end of the connecting rod 12 is carried out.
The bearing seat assembly is arranged at the corresponding position of the system base 2 through a positioning pin and a bolt, the rotating shaft 13 is arranged on the bearing, and the flange 16 is fixed with the tenon fixture 3, so that the rotating function of the tenon fixture 3 is realized. The sample piece is assembled after the tenon clamp 3 and the flange 16 are installed and fixed, so that a space for clamping the sample piece is reserved at one end of the tenon clamp 3. The base is provided with a bending moment loading module comprising a hydraulic cylinder 10 and a hydraulic cylinder mounting frame 11 and a limiting module comprising a limiting frame 9.
Tenon sample spare 4 and blade anchor clamps 6 fix through eight bolts, blade anchor clamps 6 and stopper 8 are connected with drag hook 7 through crossbeam pull rod 5. After the draw hook 7 is connected with the tensile testing machine, the height is finely adjusted, so that the tenon part of the sample piece is placed in the mortise and just presents a natural falling state. And adjusting the cross beam pull rod 5 to align the stretching center with the center of the sample piece to complete centering.
The pre-tightening is carried out before the test is carried out, and the pre-tightening force is changed according to the actual test requirement. The method comprises the steps of preloading sample pieces, namely circularly loading in a certain load range to enable the sample pieces to be tightly connected, stretching to a specified load, and simulating the centrifugal force T borne by a blade root tenon.
The two force sensors are slightly extruded at the moment, tensile load is applied to the test sample, and airflow bending moment borne by the blade root tenon is simulated. The magnitude M of the bending moment is obtained by the index F of a pressure sensor for directly measuring the thrust of the hydraulic cylinder and the magnitude M of an effective force arm, and after the index F and the magnitude M of the effective force arm are applied to a preset value, the deflection angle theta of a sample piece is measured to observe whether the sample is damaged or not and the damage form. This is the basic workflow of the device. Data were recorded and failure pictures of the test pieces were taken and associated graphs were made.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A system for testing the pull-bend coupling strength of a composite fan blade root element grade specimen, comprising: moment of flexure load module, supporting module, tenon anchor clamps module, tensile anchor clamps module and spacing module, wherein: the bending moment loading module is fixedly connected with the supporting module, the bending moment loading module applies load to simulate the load of a reduction sample under actual working conditions, the supporting module applies tensile load simulating centrifugal load to the sample through the tensile clamp module, and the limiting module limits the whole tenon not to deflect in the bending moment loading process and avoids the influence of extra bending moment caused by tensile eccentricity;
the bending moment loading module comprises: pneumatic cylinder and pneumatic cylinder mounting bracket and hydraulic system, wherein: the hydraulic cylinder is arranged on the hydraulic cylinder mounting frame, and the hydraulic system forms a hydraulic loop through an oil outlet and an oil inlet of the hydraulic cylinder to apply load.
2. The system for testing pull-bend coupling strength of claim 1, wherein said support module comprises: system base, bearing assembly and installation axle, wherein: the installation axle sets up on the system base and through fastening bolt and stretcher fixed connection, and the bearing assembly sets up on the system base through the bolt.
3. The system for testing pull-bend coupling strength of claim 2, wherein said bearing assembly comprises: self-aligning roller bearing and bearing frame, wherein: the bearing seat is provided with a through hole and a positioning hole and is connected with the system base of the supporting module through a bolt and a positioning pin;
and the system base is provided with a unthreaded hole and a positioning pin hole for mounting a bolt, and is used for determining the relative positions of other parts.
4. The system for testing pull-bend coupling strength of claim 1, wherein said tenon clamping module comprises: force sensor, tenon anchor clamps, connecting rod, flange and rotation axis, wherein: one end of the connecting rod is fixedly connected with the tenon fixture, the force sensor is arranged at the other end of the connecting rod, and the rotating shaft is connected with the end face of the tenon fixture through the bearing and the flange, so that the rotating requirement of the tenon fixture is met.
5. The system for testing the pull-bend coupling strength as claimed in claim 4, wherein the tenon fixture is provided with a mortise matched with the shape of the blade root for clamping the tenon section of the test sample to be tested.
6. The system for testing pull-bend coupling strength of claim 4, wherein the rotation shaft is a stepped shaft structure for connecting the support module and releasing the rotation freedom of the sample to be tested around the rotation center at the tenon section.
7. The system for testing pull-bend coupling strength of claim 1, wherein said tensile clamp module comprises: drag hook, crossbeam pull rod, blade anchor clamps and stopper, wherein: the drag hook top links to each other with stretcher loading end, and leaf body anchor clamps and the appearance piece fixed connection that awaits measuring, appearance piece and leaf body anchor clamps fixed connection that await measuring, stopper are fixed to be set up in leaf body anchor clamps, and the force sensor of stopper stress surface and spacing module contacts in order to restrict the rotation of sample, and crossbeam pull rod both ends are respectively through nut and leaf body anchor clamps fixed connection.
8. The system for testing pull-bend coupling strength of claim 7, wherein said blade fixture is shaped to match a processed geometric profile of a blade section portion of a test specimen.
9. The system for testing the pull-bend coupling strength as claimed in claim 7 or 8, wherein the blade holder is connected to the test sample by using a double-row bolt, and the load is transmitted to the test sample by using the bolt.
10. The system for testing pull-bend coupling strength of claim 1, wherein said limiting module comprises: force transducer and spacing, wherein: the force sensor is arranged on the side end face of the limiting bracket to monitor the counterforce generated at the limiting block of the tensile clamp module after the tenon sample piece applies bending moment and provide certain counterforce to the tenon tensile module, so that the tensile module is kept centered.
CN202010799404.7A 2020-08-11 2020-08-11 Tensile-bending coupling strength test system for composite material fan blade root element grade test sample Pending CN111855413A (en)

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CN107024386A (en) * 2017-04-27 2017-08-08 北京航空航天大学 The experimental rig applied for blade loading
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CN108444720A (en) * 2018-05-29 2018-08-24 北京航空航天大学 A kind of height week composite fatigue test fixture of turbine vanelets mortise structure
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