CN103575600A - Equipment and method for measuring bidirectional bending characteristics of sheet-shaped flexible materials - Google Patents
Equipment and method for measuring bidirectional bending characteristics of sheet-shaped flexible materials Download PDFInfo
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Abstract
The invention discloses equipment and method for measuring bidirectional bending characteristics of sheet-shaped flexible materials. The equipment comprises a bracket module for mounting parts, a sample traction module for clamping and driving a sample to do a bending motion, a displacement test module for testing decline displacement and thickness change of the sample in a bending process, a pressure test module for judging a displacement test zero point, a bending torque test module for testing bending torque change of the sample, a test control module for drive control and signal acquisition, and a calculation analysis processing module for data analysis, graph displaying and index calculation. According to the equipment, two groups of longitude and latitude test data of the sample can be obtained at the same time by performing a test for one time by virtue of the L-shaped cloth sample and longitude and latitude lever test devices, so that the labor intensity of testers can be greatly reduced and the test accuracy and the test efficiency can be improved; in addition, the equipment can be used for measuring the bending characteristics of various sheet-shaped flexible materials.
Description
Technical field
The present invention relates to material behavior field of measuring technique, more particularly, relate to a kind of measuring equipment and measuring method of sheet flexible material compound bending characteristic.
Background technology
Along with era development and scientific-technical progress, people are more and more higher for the pursuit of the qualities of life such as clothing, food, shelter, row, wherein take textile and all can produce closely bound up impact to the life of people every day.And the usability of taking textile depends on its bending features to a great extent, as apparel modeling nature and smartly dressed, not arch camber, corrugationless etc.Except taking textile, some are folding outdoor exercises textile often, as tent, sleeping bag etc., technical textile is as various aluminum foil metal films, plastic sheeting, travelling belt etc., family expenses and medical article are as paper handkerchief, bandage etc., and their bending property is also most important for the impact of people's quality of life.
For textile, method of testing and instrument that its bending property is common mainly contain: the inclined plane method based on overarm arm mechanical model of Peirce (nineteen thirty), Japan KEF-FB Fabric Style instrument, Australia's FAST Fabric Style Yi， U.S. PhabrOmeter Fabric Style instrument and domestic YG821 Fabric Style instrument.ISO and GB mainly contain inclined plane method (ISO 9073-7:1995, GB/T 18318-2001), heart-shaped method (GB/T 18318.2-2009), Ge Laifa (GB/T 18318.3-2009), cantilever method (GB/T18318.4-2009) and pure bending method (GB/T 18318.5-2009) for the method for testing of textile bending property.Wherein inclined plane method is to commonly use the method for testing of measuring fabric bendind rigidity both at home and abroad, and the method needs measurement and calculation sample mass area ratio, and reads bending length with naked eyes, therefore there is larger test error.Heart-shaped method is applicable to the more soft fabric of test, and the fabric that Ge Laifa and cantilever method are applicable to relatively endure with all one's will, therefore there is certain test limitation.In order to improve above these method of testings and to improve measuring accuracy, many effort have been done in part invention to this.As patent CN201476737U, fabric bending length tester has been done improvement on based on inclined plane method test philosophy basis; Patent CN1963458A, a kind of testing apparatus for stiffness and softness of woof, the method for utilizing machine vision and image to process has been done improvement to the method for testing of heart-shaped method; Patent CN101936856A, a kind of proving installation of flexural stiffness of textile fabric and method, done certain improvement to cantilever method.
Yet, according to some method of testings of existing report, find, the test each time of all these method of testings is only applicable to the bending property of fabric single direction to assess, and traditional inclined plane method can not reflect the dynamic changing process of fabric in BENDING PROCESS.The present invention is using for reference on pure bending method (GB/T 18318.5-2009) and Japanese KEF-FB Fabric Style instrument the basis in conjunction with inclined plane method (ISO 9073-7:1995) test philosophy, by use L shaped cloth specimen and realize through each a set of lever proving installation of broadwise two groups of test datas that once test just can obtain sample warp-weft two-way simultaneously; And by using the cruciform cloth specimen of expansion and realizing and just can obtain four groups of test datas of warp-weft two-way by once testing through each two covers lever proving installation of broadwise, this will reduce the labour intensity of testing crew greatly, improves measuring accuracy and testing efficiency.In addition, the present invention further expands test specification, be equally applicable to test except textile as other the flexural property of some sheet flexible materials such as nonwoven fabrics, plastic sheeting.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of measuring equipment and measuring method of sheet flexible material compound bending characteristic.
The technical solution adopted for the present invention to solve the technical problems is: the measuring equipment of constructing a kind of sheet flexible material compound bending characteristic, comprise for base and the column of each parts are installed, described column is loaded on described base, also comprises upper retainer panel that level is installed and lower retainer panel, the stepper motor for driving upper retainer panel to be in vertical motion, displacement transducer, pressure test module, bending moment test module, signal acquisition module and for data analysis, figure shows and index is calculated analysis and processing module; Described upper retainer panel and stepper motor are installed on described column, described displacement transducer is installed on described upper retainer panel and lower retainer panel side, described pressure test module is installed on described base and supports described lower retainer panel, described bending moment test module is near the side of described lower retainer panel, the input end of described signal acquisition module connects respectively the output terminal of each sensor, analysis and processing module input end described in described signal acquisition module output termination.
In the measuring equipment of sheet flexible material compound bending characteristic of the present invention, also comprise the screw mandrel, drive link and two limit switches that are installed on described column; Described stepper motor is controlled described upper retainer panel by coupled screw mandrel and drive link and is done upper and lower uniform motion, and described two limit switches limit respectively the bound position of described upper retainer panel.
In the measuring equipment of sheet flexible material compound bending characteristic of the present invention, described displacement transducer is high precision laser displacement sensor.
In the measuring equipment of sheet flexible material compound bending characteristic of the present invention, described pressure test module comprises three pressure transducers and spring, described pressure transducer upper surface is in same plane, described lower retainer panel is supported in described spring upper end, pressure transducer described in lower termination, and described lower retainer panel pressure is delivered on described pressure transducer.
In the measuring equipment of sheet flexible material compound bending characteristic of the present invention, described bending moment test module comprises longitude and latitude both direction a set of rod gear and the single armed overarm of posting bridge-type foil gauge separately, described rod gear comprises interconnective active force bar and passive force rod, the overarm of described single armed is closely connected with described passive force rod, and described rod gear holds to guarantee that by being installed on bearing support on described base described active force bar and the described lower retainer panel when the natural balanced state are in same plane.
The present invention also provides the said equipment to measure the method for sheet flexible material compound bending characteristic, comprises the following steps:
S1, open and adjust the measuring equipment of described sheet flexible material compound bending characteristic, make it enter measurement standby condition;
S2, sheet flexible material sample is measured, and the curve that changes with crooked radian of the sensing data real-time rendering material bending moment gathering according to described control module by described analysis and processing module;
S3, according to resulting curve, calculate each compound bending characteristic index of sheet flexible material sample.
In sheet flexible material compound bending characteristic measurement method of the present invention, in described step S1, the workbench that makes to place sample with through broadwise active force bar and lower retainer panel in same level position, pick up calibration parameter is set simultaneously, stepper motor travelling speed, test presses down displacement, the maximum pressure value between the stepper motor residence time, upper and lower retainer panel.
In sheet flexible material compound bending characteristic measurement method of the present invention, in described step S2, sample is laid in to lower retainer panel and is close on the active force bar of warp-weft two-way rod gear, upper retainer panel is with a setting speed uniform descent; When upper retainer panel gradually near and while touching the sample that is placed in lower retainer panel, be installed on the pressure transducer perception mechanics variable signal of base, now the sample original thickness value of record and the shift value of upper retainer panel are as system sample thickness and zero displacement point value; Then going up retainer panel drives lower retainer panel to clamp sample to move downward together, impel sample to make bending motion around the active force bar of described warp-weft two-way rod gear simultaneously; Instantly the pressure transducer that retainer panel reaches on setting range or base reaches while setting maximum pressure value, described motor stops a period of time, then drive upper retainer panel to rise to described upper limit position, in the decline that retainer panel contacts with sample on described and the motion process of rising, sample thickness, pressure, upper retainer panel displacement and material bending moment are gathered.
In sheet flexible material compound bending characteristic measurement method of the present invention, the travel line speed of default described stepper motor is 1mm/s, optional scope is 0-10mm/s, the decline maximum displacement of default described upper retainer panel is 50mm, optional scope is 0-60mm, and the maximum pressure between default described upper and lower retainer panel is 70gf/cm
2, optional scope is 50-200gf/cm
2, described upper retainer panel moves to the motor stopping time that the pressure between default maximum displacement or upper and lower retainer panel reaches after maximum set value and presets to 10s, and optional scope is 0-600s.
The present invention is by use L shaped cloth specimen and realize through each a set of lever proving installation of broadwise two groups of test datas that once test just can obtain sample warp-weft two-way simultaneously; And by using the cruciform cloth specimen of expansion and realizing and just can obtain four groups of test datas of warp-weft two-way by once testing through each two covers lever proving installation of broadwise, this will reduce the labour intensity of testing crew greatly, improves measuring accuracy and testing efficiency.In addition, the present invention further expands test specification, be equally applicable to test except textile as other the flexural property of some sheet flexible materials such as nonwoven fabrics, plastic sheeting.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the measuring equipment of sheet flexible material compound bending characteristic of the present invention;
Fig. 2 is the structural representation of the bending moment test module in the measuring equipment of sheet flexible material compound bending characteristic of the present invention;
Fig. 3 is sample traction and bending motion schematic diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Fig. 4 defines natural torsion angle schematic diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Fig. 5 defines crooked merit schematic diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Fig. 6 defines curved linear degree schematic diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Fig. 7 defines average bending stiffness schematic diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Fig. 8 defines maximum deflection rigidity and maximum deflection rigidity angle schematic diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Fig. 9 is the first embodiment nonwoven fabrics flexural property test curve in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Figure 10 is the second embodiment looped fabric flexural property test curve in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Figure 11 is the 3rd embodiment woven fabric flexural property test curve in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method;
Figure 12 is test macro slave computer software process flow diagram in the measuring equipment of sheet flexible material compound bending characteristic of the present invention and measuring method.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structural representation of the measuring equipment of sheet flexible material compound bending characteristic of the present invention.Equipment of the present invention comprises for the rack module of each parts is installed, for clamping and drive sample to carry out the sample traction module of bending motion, displacement measurement module for its decline displacement of test sample BENDING PROCESS and variation in thickness, for judging the displacement measurement pressure test module at zero point, the bending moment test module changing for test sample bending moment, for the control module of transmission control and signals collecting with for data analysis, the meter analysis and processing module of figure demonstration and index computing.Described rack module mainly comprises base 1 and column 2, and the optional scope 60-180cm of height sum of described base 1 and column 2, can meet desk-top or vertical operation.First-selection is 80cm, applicable to desk-top operation.
Described sample traction module comprises stepper motor 10, leading screw, drive link, upper retainer panel 3 and lower retainer panel 4.The linear velocity of described stepper motor 10 motions is adjustable within the scope of 0-10mm/s, first-selection is 1mm/s, and by the leading screw that is attached thereto and drive link, can control upper retainer panel 3 and do upper and lower uniform motion, lower retainer panel 4 is followed retainer panel 3 passive movements, the extreme position of retainer panel can manually arrange as required, preferred parameter is that the lower position of lower surface of upper retainer panel 3 is apart from base 10cm, upper limit position is apart from base 70cm, and at the upper and lower spacing limit switch 8 that is respectively equipped with, impaired to prevent motor fault under abnomal condition.The retainer panel up and down of described sample traction module, by two square metal panels, formed, the first-selected copper of metal material, the optional scope of its area is 5cm*5cm-15cm*15cm, first-selected 10cm*10cm, the optional scope 1-5cm of thickness, first-selected 2cm, wherein goes up retainer panel and is connected with the drive link that is connected stepping motor rotating shaft.
Described pressure test module comprises three pressure transducers 9 and spring 8, described pressure transducer 9 upper surfaces are in same plane, described lower test platform 4 is supported in described spring 8 upper ends, pressure transducer 9 described in lower termination, and described lower retainer panel 4 pressures are delivered on described pressure transducer 9.Before on-test, sample is laid in lower retainer panel 4, and the pressure signal of now 9 perception of pressure transducer is system original pressure value.After on-test, upper retainer panel 3 will be done descending motion under stepper motor 10 drives, and gradually near and touching to lower retainer panel 4.When upper and lower retainer panel has just been touched moment, pressure transducer 9 changes sensed pressure, and the sample original thickness value that now laser displacement sensor 5 records and upper retainer panel shift value are as system sample thickness and zero displacement point value.This module is specifically exported a millivolt magnitude voltage signals and is reflected that pressure changes.
Described displacement measurement module comprises the displacement transducer 5 of the side that is installed on upper and lower retainer panel 3 and lower retainer panel 4, the first-selected high precision laser displacement sensor of this displacement transducer, and range ability is preferably 0-100mm, and precision is preferably 10 μ m.The fundamental purpose that described displacement measurement module is set is the radian (or angle) turning over around active force bar 5-1 in order to calculate sample, and referring to Fig. 3, the computing formula of its radian is:
K=arctan((h+d)/D)；
Or angle calculation formula is
β=arctan((h+d)/D)*180/π；
Wherein:
H by the upper retainer panel 3 of survey with respect to the shift value at zero point;
D is the actual (real) thickness value of sample;
D is the horizontal range between active force bar 61 and upper retainer panel 3.
The maximum decline displacement of the lower retainer panel of H representative in Fig. 3.
This module is specifically exported a millivolt magnitude voltage signals and is reflected retainer panel travel displacement changing value and the real-time one-tenth-value thickness 1/10 of sample.
As shown in Figure 2, bending moment test module comprises longitude and latitude both direction a set of rod gear 6 and the single armed overarm 7 of posting bridge-type foil gauge 71 separately, and object is in order the flexural property of sample warp-weft two-way to be detected simultaneously.Rod gear 6 comprises active force bar 61 and passive force rod 62, single armed overarm 7 is closely connected with described passive force rod 62, and rod gear 6 holds to guarantee that by being installed on bearing support on base (1) active force bar (61) and the lower retainer panel 4 when the natural balanced state are in same plane.In order to reach warp-weft two-way with the object of surveying, also sample must be cut into " L " type.If will further improve testing efficiency, also sample can be cut into " ten " font, warp-weft two-way respectively arranges two cover leverages simultaneously.In test process, sample is crooked under certain angle around active force bar 61 under upper and lower retainer panel traction drives, active force bar 62 is two fulcrum fine rotation on rod gear 6 under the effect of the bending moment of sample, passive force rod 62 carries out mechan-amplifier by power suffered on active force bar 61 under the principle of lever moment balance, and cause that tight connected single armed overarm 7 produces deformation with it, this deformation is by 71 perception of foil gauge of being close in single armed overarm 7, obtain thus the mechanical signal that sample produces because of flexural deformation, one end of this single armed overarm 7 is attached on passive force rod 62, the other end is fixed on the bearing support of holding rod gear 6.
Described control module comprises transmission control module and signal acquisition module, specifically comprises signal condition module, AD converter and microprocessor.The pressure being collected by described sensing module, displacement and torque signals carry out filtering by signal condition module and signal amplifies processing, delivers to afterwards AD converter.AD converter is converted into by millivolt level or microvolt magnitude voltage signals as described in b the digital signal that computing machine can be identified with certain sampling rate (as every passage 50Hz).Using single-chip microcomputer as the slave computer core of microprocessor, through communications protocol as RS232, RS485, USB, IEEE1394, the communications protocol such as ICP/IP, first-selected communication format is (57600,8, E, 1) RS232 communications protocol, imports these digital signals into computing machine and is for data processing.Simultaneously, to shake hands through RS232 communications protocol and computing machine equally, single-chip microcomputer is accepted the order that computing machine sends according to data processed result, by pulse, has been controlled motor forward, the motion such as has been reversed, stops, corresponding to retainer panel rising, decline and stop.
The major function of described analysis and processing module module is embodied by the upper computer software of independent development, computing machine passes through serial ports, parallel port, USB interface etc., first-selected USB interface, can accept in real time the test data that single-chip microcomputer transmits, and after data processing, complete Drawing of Curve and index calculating, test result can be preserved by Excel form.
Systematic parameter:
1. preset the travel line speed 1mm/s of motor 10, optional scope 0-10mm/s;
2. the upper retainer panel 3 decline maximum displacement H of default sample traction module are 50mm, and optional scope is 0-60mm;
3. the maximum pressure between default upper and lower retainer panel is 70gf/cm
2, optional scope 50-200gf/cm
2
4. the upper retainer panel 3 of sample traction module moves to and presets to 10s the stop time that pressure between default maximum displacement (50mm) or upper and lower retainer panel reaches the motor 10 after maximum set value (70gf/cm2), optional scope 0-600s;
5. the maximum deformation quantity of spring 8 can reach 60mm, maximal work load 150N;
6. laser ranging displacement transducer 5 range abilities are 0-100mm, and precision can reach 10 μ m;
7. the optional scope 8cm*8cm-12cm*12cm of area separately of retainer panel up and down of test traction module, first-selection is 10cm*10cm; The optional 1-5cm of copper plate thickness, first-selection is 2cm;
8. the dimension width 10cm length of side 25cm of cutting L-type test specimens.
Test operation step: (seeing Figure 12)
S0. before on-test, the workbench that should guarantee to place sample with through broadwise active force bar 61 and lower retainer panel in same level position, by adjusting four pin of base 1, just make the bubble of the universal level of plastics in middle position, to guarantee that this horizontal level and gravity field bit are set to vertical relation;
S1. open system power supply, opens computer testing software interface;
S2. if desired calibration enters system calibration menu, and pick up calibration parameter is set, motor travelling speed, and test presses down displacement, the maximum pressure between upper and lower retainer panel, the parameters such as the motor residence time, otherwise enter step S3;
S3. testing crew only needs sample to be laid in lower retainer panel 4 and is close on the active force bar of broadwise rod gear 6 (as the state in Fig. 3 (1)), click interface and start testing button, system hummer sends " dripping " two sound prompting tests to start, and now goes up retainer panel 3 and under the drive of motor 10, is reset to upper limit place.Then, upper retainer panel 3, under stepper motor 10 is controlled, drives lower retainer panel 4 to clamp sample and moves downward, and impels sample to make bending motion (as the state in Fig. 3 (2)) around the active force bar 61 of warp-weft two-way rod gear 6 simultaneously.In this motion process, physical quantitys such as system real time record pressure, thickness, displacement, bending moment at computer interface real-time rendering curve.Until upper retainer panel 3 reaches setting range or chassis pressure transducer 9 reaches while setting maximum pressure value, now motor stopping 10s(is as the state in Fig. 3 (3));
S4. then descend afterwards retainer panel 4 at the uniform velocity to rise to initial position, whole data acquisition is complete;
S5. according to fetched data, the automatic parameter of computing machine, after completing, system hummer sends " dripping " two sound prompting tests to be finished;
S6. return to step S1, test next time.
The curve can the bending moment of real-time rendering sample on warp-weft two-way changing with radian according to physical quantitys such as the pressure gathering in experimentation, thickness, displacement and bending moments, can obtain following flexural property index according to these curves:
(1). natural torsion angle (natural bending angle):
Be in sample BENDING PROCESS, cause that sample bending moment is from null value to the minimum angles β that has remarkable increase
nthis numerical value shows that more greatly the bending resistance of sample under deadweight condition is stronger, the condition that wherein judgement significantly increases is that curve tangent value meets that to be not less than 0.268(be moment and angle curve initial stage, and moment is to 15 ° of variations of initial value generation), as shown in Figure 4.
(2). crooked merit (bending work):
Be in sample BENDING PROCESS, crooked radian K is from 0 to ending radian Ke, bending moment curve with the area B W that surrounds through radian, the Rule of judgment of cut-off radian Ke is between 0<K<1.57, choose corresponding crooked radian while there is moment maximal value, as shown in Figure 5.Its mathematic(al) representation is as follows:
Wherein the pass between crooked radian K and angle of bend β is K=β π/180.Crooked merit is larger, show that the rigidity of sample is stronger, otherwise flexibility is stronger.
(3). curved linear degree (bending linearity):
Be in sample BENDING PROCESS, crooked radian K is from 0 to cut-off radian Ke, and crooked merit and bending moment zero point are to the ratio BL that ends the corresponding bending moment of radian Ke and put the triangle area that this point-to-point transmission straight line and the horizontal left side surround, as shown in Figure 6.Its mathematic(al) representation is as follows:
Curved linear degree is higher shows that sample stiffness change is more even, otherwise the homogeneity that expression material shows at differently curved stage flexural property is poorer.
(4). average bending stiffness (average bending rigidity):
Be in sample BENDING PROCESS, crooked radian K is from natural torsion angle to cut-off radian Ke, the mean value ABR that bending moment slope of a curve changes, as shown in Figure 7.Its mathematic(al) representation is as follows:
Wherein N is for participating in calculating bending stiffness number;
Average bending stiffness is for representing that material is at the height of the whole bending resistance of BENDING PROCESS.
(5). maximum deflection rigidity (maximum bending rigidity):
Be in sample BENDING PROCESS, crooked radian K is from natural torsion angle to cut-off radian Ke, the maximal value MBR that bending moment slope of a curve changes, as shown in Figure 8.Its mathematic(al) representation is as follows:
Wherein N is for participating in calculating bending stiffness number.
(6). corresponding maximum deflection rigidity angle under maximum deflection rigidity (maximum bending rigidity angle):
β
mbr
Be in sample BENDING PROCESS, crooked radian K is from natural torsion angle to cut-off radian Ke, corresponding angle of bend during maximal value that bending moment slope of a curve changes, as shown in Figure 8.
Below three kinds of different sheet flexible materials such as nonwoven fabrics, looped fabric, woven fabric have been chosen respectively, by adjusting four pin of base 1, just making the bubble of the universal level of plastics in middle position, to guarantee the workbench of placement sample and to test under the prerequisite in same level position through broadwise active force bar 61 and lower retainer panel 4, son is described the present invention in detail with accompanying drawing in conjunction with specific embodiments.
Embodiment mono-:
L shaped nonwoven fabrics specimen is tiled to lower retainer panel 4 and is close on the active force bar 61 of broadwise rod gear 6, in computing machine, open upper computer software and click after start button, system hummer sends " dripping " two sound prompting tests to start automatically, and upper retainer panel 3 will for example, with a setting speed (, 1mm/s) uniform descent.When upper retainer panel 3 gradually near and while touching the sample on being placed in lower retainer panel 4, be installed on the pressure transducer 9 perception mechanics variable signals of base 1, now the sample original thickness value of record and upper retainer panel shift value are as system sample thickness and zero displacement point value.Go up afterwards retainer panel 3 and drive lower retainer panel 4 to clamp sample to move downward together, the physical quantity such as real time record pressure, thickness, displacement and bending moment at computer interface real-time rendering curve in this motion process.Until lower retainer panel 4 reaches setting range or chassis pressure transducer 9 reaches while setting maximum pressure value, now motor 10 stops rising to the upper limit position of the switch after ten seconds, off-test, upper computer software carries out data analysis according to the data obtained and index is calculated.Test typical curve as shown in Figure 9.Shown in three test index tables 1:
Table 1
Embodiment bis-:
L shaped looped fabric specimen is tiled to lower retainer panel 4 and is close on the active force bar 61 of broadwise rod gear 6, in computing machine, open upper computer software and click after start button, system hummer sends " dripping " two sound prompting tests to start automatically, and upper retainer panel 3 will for example, with a setting speed (, 1mm/s) uniform descent.When upper retainer panel 3 gradually near and while touching the sample on being placed in lower retainer panel 4, be installed on the pressure transducer 9 perception mechanics variable signals of base 1, now the sample original thickness value of record and upper retainer panel shift value are as system sample thickness and zero displacement point value.Go up afterwards retainer panel 3 and drive lower retainer panel 4 to clamp sample to move downward together, the physical quantity such as real time record pressure, thickness, displacement and bending moment at computer interface real-time rendering curve in this motion process.Until lower retainer panel 4 reaches setting range or chassis pressure transducer 9 reaches while setting maximum pressure value, now motor 10 stops rising to the upper limit position of the switch after ten seconds, off-test, upper computer software carries out data analysis according to the data obtained and index is calculated.Test typical curve as shown in figure 10.Three times test index is as shown in table 2:
Table 2
Embodiment tri-:
L shaped woven fabric specimen is tiled to lower retainer panel 4 and is close on the active force bar 61 of broadwise rod gear 6, in computing machine, open upper computer software and click after start button, system hummer sends " dripping " two sound prompting tests to start automatically, and upper retainer panel 3 will for example, with a setting speed (, 1mm/s) uniform descent.When upper retainer panel 3 gradually near and while touching the sample on being placed in lower retainer panel 4, be installed on the pressure transducer 9 perception mechanics variable signals of base 1, now the sample original thickness value of record and upper retainer panel shift value are as system sample thickness and zero displacement point value.Go up afterwards retainer panel 3 and drive lower retainer panel 4 to clamp sample to move downward together, the physical quantity such as real time record pressure, thickness, displacement and bending moment at computer interface real-time rendering curve in this motion process.Until lower retainer panel 4 reaches setting range or chassis pressure transducer 9 reaches while setting maximum pressure value, now motor 10 stops rising to the upper limit position of the switch after ten seconds, off-test, upper computer software carries out data analysis according to the data obtained and index is calculated.Test typical curve as shown in figure 11.Three times test index is as shown in table 3:
Table 3
The foregoing is only preferred embodiment of the present invention, be not limited to the present invention, all any modifications of making within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included in protection scope of the present invention.
Claims (9)
1. the measuring equipment of a sheet flexible material compound bending characteristic, it is characterized in that, comprise base (1) and column (2) for each parts are installed, it is upper that described column (2) is loaded on described base (1), also comprises upper retainer panel (3) that level is installed and lower retainer panel (4), the stepper motor (10) for driving upper retainer panel (3) to be in vertical motion, displacement transducer (5), pressure test module, bending moment test module, signal acquisition module and show and the analysis and processing module of index calculating for data analysis, figure; Described upper retainer panel (3) and stepper motor (10) are installed on described column (2), described displacement transducer (5) is installed on described upper retainer panel (3) and lower retainer panel (4) side, described pressure test module is installed on described base (1) above and supports described lower retainer panel (4), described bending moment test module is near the side of described lower retainer panel (4), the input end of described signal acquisition module connects respectively the output terminal of each sensor, analysis and processing module input end described in described signal acquisition module output termination.
2. the measuring equipment of sheet flexible material compound bending characteristic according to claim 1, is characterized in that, described equipment also comprises screw mandrel, drive link and two limit switches that are installed on described column (2); Described stepper motor (10) is controlled described upper retainer panel (3) by coupled screw mandrel and drive link and is done upper and lower uniform motion, and described two limit switches limit respectively the bound position of described upper retainer panel (3).
3. the measuring equipment of sheet flexible material compound bending characteristic according to claim 1, is characterized in that, described displacement transducer (5) is high precision laser displacement sensor.
4. the measuring equipment of sheet flexible material compound bending characteristic according to claim 1, it is characterized in that, described pressure test module comprises three pressure transducers (9) and spring (8), described pressure transducer (9) upper surface is in same plane, described lower retainer panel (4) is supported in described spring (8) upper end, pressure transducer (9) described in lower termination, and described lower retainer panel (4) pressure is delivered on described pressure transducer (9).
5. according to the measuring equipment of sheet flexible material compound bending characteristic claimed in claim 1, it is characterized in that, described bending moment test module comprises longitude and latitude both direction a set of rod gear (6) and the single armed overarm (7) of posting bridge-type foil gauge (71) separately, described rod gear (6) comprises interconnective active force bar (61) and passive force rod (62), described single armed overarm (7) is closely connected with described passive force rod (62), described rod gear (6) by be installed on bearing support on described base (1) hold to guarantee described active force bar (61) with the described lower retainer panel (4) when the natural balanced state in same plane.
6. right to use requires a measuring method for the sheet flexible material compound bending characteristic of the measuring equipment of sheet flexible material compound bending characteristic described in 1, it is characterized in that, comprises the following steps:
S1, open and adjust the measuring equipment of described sheet flexible material compound bending characteristic, make it enter measurement standby condition;
S2, sheet flexible material sample is measured, and the curve that changes with crooked radian of the sensing data real-time rendering material bending moment gathering according to described control module by described analysis and processing module;
S3, according to resulting curve, calculate each compound bending characteristic index of sheet flexible material sample.
7. the measuring method of sheet flexible material compound bending characteristic according to claim 6, it is characterized in that, in described step S1, the workbench that makes to place sample with through broadwise active force bar and lower retainer panel (4) in same level position, pick up calibration parameter is set simultaneously, stepper motor travelling speed, test presses down displacement, the maximum pressure value between the stepper motor residence time, upper retainer panel (3) and lower retainer panel (4).
8. the measuring method of sheet flexible material compound bending characteristic according to claim 6, it is characterized in that, in described step S2, sample is laid in to lower retainer panel (4) and is close on the active force bar of warp-weft two-way rod gear (6) (61), upper retainer panel (3) is with a setting speed uniform descent; When upper retainer panel (3) gradually near and while touching the sample that is placed in lower retainer panel (4), be installed on the pressure transducer perception mechanics variable signal of base (1), now the sample original thickness value of record and the shift value of upper retainer panel (3) are as system sample thickness and zero displacement point value; Then going up retainer panel (3) drives lower retainer panel (4) to clamp sample to move downward together, impel sample to make bending motion around the active force bar (61) of described warp-weft two-way rod gear (6) simultaneously; Instantly the pressure transducer that retainer panel (4) reaches on setting range or base (1) reaches while setting maximum pressure value, and described motor stops a period of time, then drives upper retainer panel (3) to rise to described upper limit position; In the decline that retainer panel on described (3) contacts with sample and the motion process of rising, sample thickness, pressure, upper retainer panel displacement and material bending moment are gathered.
9. the measuring method of sheet flexible material compound bending characteristic according to claim 7, it is characterized in that, the travel line speed of default described stepper motor (10) is 1mm/s, optional scope is 0-10mm/s, the decline maximum displacement of default described upper retainer panel (3) is 50mm, optional scope is 0-60mm, and the maximum pressure between default described upper and lower retainer panel is 70gf/cm
2, optional scope is 50-200 gf/cm
2, described upper retainer panel (3) moves to the motor stopping time that the pressure between default maximum displacement or upper and lower retainer panel reaches after maximum set value and presets to 10s, optional scope 0-600s.
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