CN103575600B - The measuring equipment of sheet-like flexible material compound bending characteristic and measuring method - Google Patents
The measuring equipment of sheet-like flexible material compound bending characteristic and measuring method Download PDFInfo
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Abstract
The invention discloses a kind of measuring equipment and measuring method of sheet-like flexible material compound bending characteristic.Described equipment comprises the rack module for installing each parts, for clamping and driving sample to carry out the sample traction module of bending motion, for the displacement measurement module of its decline displacement and variation in thickness in test sample BENDING PROCESS, for judging the pressure test module at displacement measurement zero point, for the bending moment test module of test sample bending moment change, for the control module of transmission control and signals collecting with for data analysis, the meter analysis and processing module of figure display and index computing.The present invention just can obtain two groups of test datas of sample warp-weft two-way by using L shape cloth specimen and realizing once test through each a set of lever proving installation of broadwise simultaneously, greatly can reduce the labour intensity of testing crew, improve measuring accuracy and testing efficiency.In addition, the present invention can measure the flexural property of multiple sheet-like flexible material.
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-like 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 the life of textile on people every day and all can produce closely bound up impact.And the usability taking textile depends on its bending features to a great extent, as apparel modeling is natural and smartly dressed, not arch camber, corrugationless etc.Except taking textile, some often folding outdoor exercises textiles, as tent, sleeping bag etc., technical textile is as various aluminum foil metal film, 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, the method of testing that its bending property is common and instrument mainly contain: the inclined plane method based on arm mechanical model of hanging oneself from a beam of Peirce (nineteen thirty), Japan KEF-FB Fabric Style instrument, Australia FAST Fabric Style instrument, U.S. PhabrOmeter Fabric Style instrument and domestic YG821 Fabric Style instrument.ISO and GB mainly contain inclined plane method (ISO9073-7:1995, GB/T18318-2001), heart-shaped method (GB/T18318.2-2009), Ge Laifa (GB/T18318.3-2009), cantilever method (GB/T18318.4-2009) and pure bending method (GB/T18318.5-2009) for the method for testing of textile bending property.Wherein inclined plane method is the method for testing of conventional mensuration 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 test more soft fabric, and Ge Laifa and cantilever method are applicable to the fabric relatively endured with all one's will, therefore there is certain test limitation.In order to improve these method of testings above and improve measuring accuracy, part invention has done many effort to this.As patent CN201476737U, fabric bending length tester, is doing improvement based on inclined plane method test philosophy basis; Patent CN1963458A, a kind of testing apparatus for stiffness and softness of woof, utilizes the method for testing of the method for machine vision and image procossing to heart-shaped method to do improvement; Patent CN101936856A, a kind of proving installation of flexural stiffness of textile fabric and method, done certain improvement to cantilever method.
But, some method of testings according to existing report find, the test each time of all these method of testings is only applicable to assess the bending property of fabric single direction, and traditional inclined plane method can not reflect the dynamic changing process of fabric in BENDING PROCESS.On the basis of the present invention in reference pure bending method (GB/T18318.5-2009) and Japanese KEF-FB Fabric Style instrument and in conjunction with inclined plane method (ISO9073-7:1995) test philosophy, just can obtain two groups of test datas of sample warp-weft two-way by using L shape cloth specimen and realizing once test through each a set of lever proving installation of broadwise simultaneously; And by using the cruciform cloth specimen of expansion and realizing just can obtaining warp-weft two-way four groups of test datas by once testing through each two cover lever proving installations of broadwise, this will reduce the labour intensity of testing crew greatly, improves measuring accuracy and testing efficiency.In addition, the present invention expands test specification further, is equally applicable to test except textile as other the flexural property of some sheet-like 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-like flexible material compound bending characteristic.
The technical solution adopted for the present invention to solve the technical problems is: the measuring equipment constructing a kind of sheet-like flexible material compound bending characteristic, comprise the base for installing each parts and column, described column is loaded on described base, also comprises upper retainer panel that level installs and lower retainer panel, 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 the analysis and processing module for data analysis, figure display and index calculate; Described upper retainer panel and stepper motor are installed on described column, institute's displacement sensors is installed on described upper retainer panel and lower retainer panel side, described pressure test module to be installed on described base and to support 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 the output terminal of each sensor respectively, and described signal acquisition module exports analysis and processing module input end described in termination.
In the measuring equipment of sheet-like 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 controls described upper retainer panel by coupled screw mandrel and drive link and does upper and lower uniform motion, and described two limit switches limit the bound position of described upper retainer panel respectively.
In the measuring equipment of sheet-like flexible material compound bending characteristic of the present invention, institute's displacement sensors is high precision laser displacement sensor.
In the measuring equipment of sheet-like 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 spring upper end supports described lower retainer panel, pressure transducer described in lower termination, and described lower retainer panel pressure is delivered on described pressure transducer.
In the measuring equipment of sheet-like flexible material compound bending characteristic of the present invention, described bending moment test module comprises a set of rod gear and the single armed overarm of posting bridge-type foil gauge separately of longitude and latitude both direction, described rod gear comprises interconnective active force bar and passive force rod, described single armed overarm is closely connected with described passive force rod, and described rod gear is held to ensure that described active force bar is in same plane with described lower retainer panel when being in natural balanced state by the bearing support be installed on described base.
The present invention also provides the said equipment to measure the method for sheet-like flexible material compound bending characteristic, comprises the following steps:
S1, open and adjust the measuring equipment of described sheet-like flexible material compound bending characteristic, making it enter measurement standby condition;
S2, sheet-like flexible material sample to be measured, and by curve that described analysis and processing module changes with crooked radian according to the sensing data real-time rendering material bending moment that described control module gathers;
S3, according to obtained curve, calculate each compound bending characteristic index of sheet-like flexible material sample.
In sheet-like flexible material compound bending characteristic measurement method of the present invention, in described step S1, make the workbench of placement sample and be in same level position through broadwise active force bar and lower retainer panel, 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-like flexible material compound bending characteristic measurement method of the present invention, in described step S2, sample is laid in 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 when touching the sample being placed in lower retainer panel, be installed on the pressure sensor senses mechanical change signal of base, the sample original thickness value now recorded and the shift value of upper retainer panel are as system specimen thickness and zero displacement point value; Then go up retainer panel to drive 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 when the retainer panel pressure transducer reached on setting range or base reaches setting maximum pressure value, described motor stops a period of time, then upper retainer panel is driven to rise to described upper limit position, on described in retainer panel and the decline of sample contacts and the motion process of rising, sample thickness, pressure, upper retainer panel displacement and material bending moment are gathered.
In sheet-like flexible material compound bending characteristic measurement method of the present invention, the travel line speed presetting described stepper motor is 1mm/s, range of choices is 0-10mm/s, the decline maximum displacement presetting described upper retainer panel is 50mm, range of choices is 0-60mm, and the maximum pressure preset between described upper and lower retainer panel is 70gf/cm
2, range of choices is 50-200gf/cm
2, the motor stopping time after the described upper retainer panel pressure moved between default maximum displacement or upper and lower retainer panel reaches maximum set value presets to 10s, and range of choices is 0-600s.
The present invention just can obtain two groups of test datas of sample warp-weft two-way by using L shape cloth specimen and realizing once test through each a set of lever proving installation of broadwise simultaneously; And by using the cruciform cloth specimen of expansion and realizing just can obtaining warp-weft two-way four groups of test datas by once testing through each two cover lever proving installations of broadwise, this will reduce the labour intensity of testing crew greatly, improves measuring accuracy and testing efficiency.In addition, the present invention expands test specification further, is equally applicable to test except textile as other the flexural property of some sheet-like 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-like 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-like 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-like 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-like flexible material compound bending characteristic of the present invention and measuring method;
Fig. 5 is the bending merit schematic diagram of definition in the measuring equipment of sheet-like 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-like 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-like 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-like 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-like 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-like 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-like 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-like 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 clearly understand, 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, be not intended to limit the present invention.
Fig. 1 shows the structural representation of the measuring equipment of sheet-like flexible material compound bending characteristic of the present invention.Equipment of the present invention comprises the rack module for installing each parts, for clamping and driving sample to carry out the sample traction module of bending motion, for the displacement measurement module of its decline displacement and variation in thickness in test sample BENDING PROCESS, for judging the pressure test module at displacement measurement zero point, for the bending moment test module of test sample bending moment change, for the control module of transmission control and signals collecting with for data analysis, the meter analysis and processing module of figure display and index computing.Described rack module mainly comprises base 1 and column 2, and described base 1 and the height sum range of choices 60-180cm of column 2, can meet desk-top or vertical operation.First-selection is 80cm, is 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 that described stepper motor 10 moves is adjustable within the scope of 0-10mm/s, first-selection is 1mm/s, and upper retainer panel 3 can be controlled by the leading screw that is attached thereto and drive link and do upper and lower uniform motion, lower retainer panel 4 follows retainer panel 3 passive movement, the extreme position of retainer panel can manually be arranged as required, preferred parameter is the lower position distance base 10cm of the lower surface of upper retainer panel 3, upper limit position distance base 70cm, and spacing up and down, a limit switch 8 is respectively housed, to prevent motor fault under abnomal condition impaired.The retainer panel up and down of described sample traction module, be made up of two pieces of square metal panels, the first-selected copper of metal material, its area range of choices is 5cm*5cm-15cm*15cm, first-selected 10cm*10cm, thickness range of choices 1-5cm, first-selected 2cm, wherein go up retainer panel and be connected with the drive link being connected stepping motor rotating shaft.
Described pressure test module comprises three pressure transducers 9 and spring 8, described pressure transducer 9 upper surface is in same plane, described spring 8 upper end supports described lower test platform 4, pressure transducer 9 described in lower termination, and described lower retainer panel 4 pressure is delivered on described pressure transducer 9.Before on-test, sample is laid in lower retainer panel 4, and the pressure signal of now pressure transducer 9 perception is system initial pressure value.After on-test, upper retainer panel 3 will do 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 touched moment, sensed pressure changes by pressure transducer 9, and now the sample original thickness value that records of laser displacement sensor 5 and upper retainer panel shift value are as system specimen thickness and zero displacement point value.This module specifically exports millivolt magnitude voltage signals to reflect that pressure changes.
Described displacement measurement module comprises the displacement transducer 5 of the side being installed on upper and lower retainer panel 3 and lower retainer panel 4, and the first-selected high precision laser displacement sensor of this displacement transducer, range ability is preferably 0-100mm, and precision is preferably 10 μm.The fundamental purpose arranging described displacement measurement module is the radian (or angle) turned over around active force bar 5-1 to calculate sample, and see 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 survey retainer panel 3 relative 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 the H representative in Fig. 3.
This module specifically exports millivolt magnitude voltage signals to reflect upper retainer panel travel displacement changing value and sample real-time thickness value.
As shown in Figure 2, bending moment test module comprises a set of rod gear 6 and the single armed overarm 7 of posting bridge-type foil gauge 71 separately of longitude and latitude both direction, and object is the flexural property in order to sample warp-weft two-way 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 is held to ensure that active force bar (61) is in same plane with the lower retainer panel 4 when being in natural balanced state by the bearing support be installed on base (1).In order to reach warp-weft two-way with the object surveyed, also sample must be cut into " L " type.If will improve testing efficiency further, also sample can be cut into " ten " font, warp-weft two-way respectively arranges two cover leverages simultaneously.In test process, sample is bending under certain angle around active force bar 61 under upper and lower retainer panel traction drives, two the fulcrum fine rotation of active force bar 62 under the effect of the bending moment of sample on rod gear 6, under the principle that passive force rod 62 balances at lever moment, power suffered on active force bar 61 is carried out mechan-amplifier, and cause the single armed overarm 7 be closely connected with it to produce deformation, this deformation is by foil gauge 71 perception be close in single armed overarm 7, obtain the mechanical signal that sample produces because of flexural deformation thus, one end of this single armed overarm 7 is attached on passive force rod 62, the other end be fixed on hold rod gear 6 bearing support on.
Described control module comprises transmission control module and signal acquisition module, specifically comprises Signal-regulated kinase, AD converter and microprocessor.The pressure collected by described sensing module, displacement and torque signals carry out filtering by Signal-regulated kinase and signal amplifies process, delivers to AD converter afterwards.Millivolt level as described in b or microvolt magnitude voltage signals to be converted into certain sampling rate (as every passage 50Hz) digital signal that computing machine can identify by AD converter.Slave computer core using single-chip microcomputer as microprocessor, through communications protocol as RS232, RS485, USB, the communications protocol such as IEEE1394, 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, be through RS232 communications protocol equally and computing machine is shaken hands, single-chip microcomputer accepts the order that computing machine sends according to data processed result, is completed motions such as motor rotating forward, reversion, stoppings by Pulse Width Control, corresponds to the rising of retainer panel, declines 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 the test data that single-chip microcomputer transmits in real time, and after data processing, complete Drawing of Curve and index calculate, test result can be preserved by Excel form.
Systematic parameter:
1. preset the travel line speed 1mm/s of motor 10, range of choices 0-10mm/s;
2. presetting the upper retainer panel 3 of the sample traction module maximum displacement H that declines is 50mm, and range of choices is 0-60mm;
3. the maximum pressure preset between upper and lower retainer panel is 70gf/cm
2, range of choices 50-200gf/cm
2
4. the stop time of the motor 10 after the upper retainer panel 3 of the sample traction module pressure moved between default maximum displacement (50mm) or upper and lower retainer panel reaches maximum set value (70gf/cm2) presets to 10s, range of choices 0-600s;
5. the maximum deformation quantity of spring 8 can reach 60mm, maximal work load 150N;
6. laser ranging displacement transducer 5 range ability is 0-100mm, and precision can reach 10 μm;
7. test the area range of choices 8cm*8cm-12cm*12cm separately of retainer panel up and down of 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: (see Figure 12)
S0. before on-test, the workbench of placement sample should be ensured and be in same level position through broadwise active force bar 61 and lower retainer panel, the bubble of the universal level of plastics is made to be in middle position, to ensure that this horizontal level and gravity field bit are set to vertical relation by the four pin height adjusting base 1;
S1. open system power supply, opens computer testing software interface;
S2. if desired calibrate, enter system calibration menu, arrange pick up calibration parameter, motor travelling speed, test presses down displacement, the maximum pressure between upper and lower retainer panel, the parameters such as the motor residence time, otherwise enters 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 (state (1) as in Fig. 3), single-click interface starts testing button, system beep device sends " dripping ", and two sound prompting tests start, and now go up retainer panel 3 under the drive of motor 10, are reset to upper limit place.Then, upper retainer panel 3, under stepper motor 10 controls, drives lower retainer panel 4 to clamp sample and moves downward, impel sample to make bending motion (state (2) as in Fig. 3) around the active force bar 61 of warp-weft two-way rod gear 6 simultaneously.In this motion process, the physical quantity such as system real time record pressure, thickness, displacement, bending moment at computer interface real-time rendering curve.Until upper retainer panel 3 reach setting range or chassis pressure transducer 9 reach setting maximum pressure value time, now motor stopping 10s(is as the state (3) in Fig. 3);
S4. then descend retainer panel 4 at the uniform velocity to rise to initial position afterwards, whole data acquisition is complete;
S5. according to fetched data, the automatic parameter of computing machine, after completing, system beep device sends " dripping ", and two sound prompting tests terminate;
S6. return step S1, test next time.
The physical quantitys such as the pressure experimentally gathered in process, thickness, displacement and bending moment can the curve that changes with radian of the bending moment of real-time rendering sample on warp-weft two-way, can obtain following flexural property index according to these curves:
(1). natural torsion angle (naturalbendingangle):
Namely, in sample BENDING PROCESS, cause sample bending moment from null value to there being the minimum angles β significantly increased
nthis numerical value shows that more greatly the bending resistance of sample under deadweight condition is stronger, wherein judging that the condition significantly increased is that curve tangent value meets and is not less than 0.268(and moment and angle curve starting stage, there are 15 ° of changes to initial value in moment), as shown in Figure 4.
(2). bending merit (bendingwork):
Namely 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 crooked radian corresponding when there is moment maximal value, as shown in Figure 5.Its mathematic(al) representation is as follows:
Pass wherein between crooked radian K and angle of bend β is K=β π/180.Bending merit is larger, show that the rigidity of sample is stronger, otherwise then flexibility is stronger.
(3). curved linear degree (bendinglinearity):
Namely, in sample BENDING PROCESS, crooked radian K is from 0 to ending radian Ke, and bending merit extremely ends the ratio BL of the triangle area that this point-to-point transmission straight line of radian Ke corresponding bending moment point surrounds with the horizontal left side zero point with bending moment, 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 represents that the homogeneity that material shows at differently curved stage flexural property is poorer.
(4). average bending stiffness (averagebendingrigidity):
Namely in sample BENDING PROCESS, crooked radian K from natural torsion angle to cut-off radian Ke, the mean value ABR of bending moment slope of a curve change, as shown in Figure 7.Its mathematic(al) representation is as follows:
Wherein N calculates bending stiffness number for participating in;
Average bending stiffness is for representing the height of material overall bending resistance in BENDING PROCESS.
(5). maximum deflection rigidity (maximumbendingrigidity):
Namely in sample BENDING PROCESS, crooked radian K from natural torsion angle to cut-off radian Ke, the maximal value MBR of bending moment slope of a curve change, as shown in Figure 8.Its mathematic(al) representation is as follows:
Wherein N calculates bending stiffness number for participating in.
(6). maximum deflection rigidity angle (maximumbendingrigidityangle) corresponding under maximum deflection rigidity:
β
mbr
Namely in sample BENDING PROCESS, crooked radian K from natural torsion angle to cut-off radian Ke, angle of bend corresponding during the maximal value of bending moment slope of a curve change, as shown in Figure 8.
Below have chosen the different sheet-like flexible material of nonwoven fabrics, looped fabric, woven fabric etc. three kinds respectively, the bubble of the universal level of plastics is made to be in middle position at the four pin height by adjustment base 1, to ensure the workbench of placement sample and to test under broadwise active force bar 61 and lower retainer panel 4 are in the prerequisite of same level position, the present invention described in detail by son and accompanying drawing in conjunction with specific embodiments.
Embodiment one:
L shape nonwoven fabrics test sample is tiled to lower retainer panel 4 and is close on the active force bar 61 of broadwise rod gear 6, open upper computer software in a computer and after clicking start button, system beep device sends " dripping ", and two sound prompting tests start automatically, and upper retainer panel 3 will with a setting speed (such as, 1mm/s) uniform descent.When upper retainer panel 3 gradually near and touch in time being placed in the sample in lower retainer panel 4, be installed on the pressure transducer 9 perception mechanics variable signal of base 1, the sample original thickness value now recorded and upper retainer panel shift value are as system specimen thickness and zero displacement point value.Go up retainer panel 3 afterwards to 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 in this motion process at computer interface real-time rendering curve.Until lower retainer panel 4 reach setting range or chassis pressure transducer 9 reach setting maximum pressure value time, now motor 10 rises to the upper limit position of the switch after stopping ten seconds, off-test, upper computer software carries out data analysis and index calculate according to the data obtained.Test typical curve as shown in Figure 9.Shown in three test index tables 1:
Table 1
Embodiment two:
L shape looped fabric test sample is tiled to lower retainer panel 4 and is close on the active force bar 61 of broadwise rod gear 6, open upper computer software in a computer and after clicking start button, system beep device sends " dripping ", and two sound prompting tests start automatically, and upper retainer panel 3 will with a setting speed (such as, 1mm/s) uniform descent.When upper retainer panel 3 gradually near and touch in time being placed in the sample in lower retainer panel 4, be installed on the pressure transducer 9 perception mechanics variable signal of base 1, the sample original thickness value now recorded and upper retainer panel shift value are as system specimen thickness and zero displacement point value.Go up retainer panel 3 afterwards to 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 in this motion process at computer interface real-time rendering curve.Until lower retainer panel 4 reach setting range or chassis pressure transducer 9 reach setting maximum pressure value time, now motor 10 rises to the upper limit position of the switch after stopping ten seconds, off-test, upper computer software carries out data analysis and index calculate according to the data obtained.Test typical curve as shown in Figure 10.Three times test index is as shown in table 2:
Table 2
Embodiment three:
L shape woven fabric test sample is tiled to lower retainer panel 4 and is close on the active force bar 61 of broadwise rod gear 6, open upper computer software in a computer and after clicking start button, system beep device sends " dripping ", and two sound prompting tests start automatically, and upper retainer panel 3 will with a setting speed (such as, 1mm/s) uniform descent.When upper retainer panel 3 gradually near and touch in time being placed in the sample in lower retainer panel 4, be installed on the pressure transducer 9 perception mechanics variable signal of base 1, the sample original thickness value now recorded and upper retainer panel shift value are as system specimen thickness and zero displacement point value.Go up retainer panel 3 afterwards to 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 in this motion process at computer interface real-time rendering curve.Until lower retainer panel 4 reach setting range or chassis pressure transducer 9 reach setting maximum pressure value time, now motor 10 rises to the upper limit position of the switch after stopping ten seconds, off-test, upper computer software carries out data analysis and index calculate according to the data obtained.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 amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included in protection scope of the present invention.
Claims (8)
1. the measuring equipment of a sheet-like flexible material compound bending characteristic, it is characterized in that, comprise the base (1) for installing each parts and column (2), described column (2) is loaded on described base (1), also comprise upper retainer panel (3) and the lower retainer panel (4) of level installation, the stepper motor (10) be in vertical motion for driving upper retainer panel (3), displacement transducer (5), pressure test module, bending moment test module, signal acquisition module and for data analysis, the analysis and processing module of figure display and index calculate, described upper retainer panel (3) and stepper motor (10) are installed on described column (2), institute's displacement sensors (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) and goes up and support 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 the output terminal of each sensor respectively, described signal acquisition module exports analysis and processing module input end described in termination,
Described bending moment test module comprise longitude and latitude both direction separately a set of rod gear (6) and post bridge-type foil gauge (71) single armed overarm (7), 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) is held to ensure that described active force bar (61) is in same plane with the described lower retainer panel (4) when being in natural balanced state by the bearing support be installed on described base (1).
2. the measuring equipment of sheet-like flexible material compound bending characteristic according to claim 1, is characterized in that, described equipment also comprises the screw mandrel, drive link and two limit switches that are installed on described column (2); Described stepper motor (10) controls described upper retainer panel (3) by coupled screw mandrel and drive link and does upper and lower uniform motion, and described two limit switches limit the bound position of described upper retainer panel (3) respectively.
3. the measuring equipment of sheet-like flexible material compound bending characteristic according to claim 1, it is characterized in that, institute's displacement sensors (5) is high precision laser displacement sensor.
4. the measuring equipment of sheet-like 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 spring (8) upper end supports described lower retainer panel (4), pressure transducer (9) described in lower termination, and described lower retainer panel (4) pressure is delivered on described pressure transducer (9).
5. use a measuring method for the sheet-like flexible material compound bending characteristic of the measuring equipment of sheet-like flexible material compound bending characteristic described in claim 1, it is characterized in that, comprise the following steps:
S1, open and adjust the measuring equipment of described sheet-like flexible material compound bending characteristic, making it enter measurement standby condition;
S2, sheet-like flexible material sample to be measured, and by curve that described analysis and processing module changes with crooked radian according to the sensing data real-time rendering material bending moment that described signal acquisition module gathers;
S3, according to obtained curve, calculate each compound bending characteristic index of sheet-like flexible material sample.
6. the measuring method of sheet-like flexible material compound bending characteristic according to claim 5, it is characterized in that, in described step S1, make the workbench of placement sample and be in same level position through broadwise active force bar and lower retainer panel (4), pick up calibration parameter is set simultaneously, stepper motor travelling speed, test presses down displacement, the stepper motor residence time, maximum pressure value between upper retainer panel (3) and lower retainer panel (4).
7. the measuring method of sheet-like flexible material compound bending characteristic according to claim 5, it is characterized in that, in described step S2, sample be laid in lower retainer panel (4) and be close on the active force bar (61) of warp-weft two-way rod gear (6), upper retainer panel (3) is with a setting speed uniform descent; When upper retainer panel (3) gradually near and when touching the sample being placed in lower retainer panel (4), be installed on the pressure sensor senses mechanical change signal of base (1), the shift value of the sample original thickness value now recorded and upper retainer panel (3) is as system specimen thickness and zero displacement point value; Then go up retainer panel (3) to drive 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 when retainer panel (4) pressure transducer reached on setting range or base (1) reaches setting maximum pressure value, described motor stops a period of time, then drives upper retainer panel (3) to rise to its upper limit position; Retainer panel (3) is with the decline of sample contacts and the motion process of rising on described, gathers sample thickness, pressure, upper retainer panel displacement and material bending moment.
8. the measuring method of sheet-like flexible material compound bending characteristic according to claim 6, it is characterized in that, the travel line speed presetting described stepper motor (10) is 0-10mm/s, the decline maximum displacement presetting described upper retainer panel (3) is 0-60mm, and the maximum pressure preset between described upper and lower retainer panel is 50-200gf/cm
2, the motor stopping time after described upper retainer panel (3) pressure moved between default maximum displacement or upper and lower retainer panel reaches maximum set value presets to 0-600s.
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