CN1034997A - Acoustic radiating instrument for fibre material - Google Patents
Acoustic radiating instrument for fibre material Download PDFInfo
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- CN1034997A CN1034997A CN 88105476 CN88105476A CN1034997A CN 1034997 A CN1034997 A CN 1034997A CN 88105476 CN88105476 CN 88105476 CN 88105476 A CN88105476 A CN 88105476A CN 1034997 A CN1034997 A CN 1034997A
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- acoustic emission
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Abstract
A kind of Acoustic radiating instrument of forming by stepper motor, acoustic emission transducer sensor, dynamometry strainometer, registering instrument, with provided by the invention a kind of can with the closely-coupled anchor clamps of acoustic emission transducer sensor, trickle materials such as monofilament that firmly clamping exactly detects, multifilament, film, and the acoustic emission phenomenon that measured material is produced in loading process, pass to the acoustic emission transducer sensor exactly, the acoustic emission transducer sensor directly must be attached to the situation that just can detect on the measured material thereby changed existing Acoustic radiating instrument.The advantage that this device has is simple in structure, easy to use, testing result is accurate and synchronism is good.
Description
The present invention relates to a kind of acoustic emission device, especially for the device of detection fibers acoustic emission.
Existing acoustic emission device normally is used with strength tester.When augmentor applies power to measured material, the acoustical signal of launching behind the acoustic emission device test material stress and deformation.In order to make detected acoustical signal more accurate, need directly stick on the acoustic emission transducer sensor of acoustic emission device on the measured material.Will make sensing range be subjected to the restriction of measured material body characteristics like this, particularly for fiber-like material, as yarn, long filament etc., diameter is generally all very trickle, quality is soft, the acoustic emission transducer sensor of acoustic emission device can't be pasted at all, thereby existing Acoustic radiating instrument can't carry out acoustic emission detection to fiber-like material.In the domestic and foreign literature up to now, do not see by detecting acoustic emission phenomenon and study the report of fibrous material characteristic.
Elongation, the fracture characteristics of research fibrous material generally are to be undertaken by the method for high-speed photography at present.Utilize high-speed camera, the overall process of fiber stressed back elongation, fracture is filmed, the film of processing then by projector, is observed instantaneous fiber form again, infers the overall process of elongate fiber, fracture, the characteristic of analysis and research fibrous material.Though make relatively more directly perceived in this way, but fibrous material generally belongs to transparent materials, when multiply fiber such as long filament, yarn etc. are photographed, owing to block mutually between fibre single thread, can't photograph the situation of the part that is blocked, therefore the result who observes must not be sufficiently complete.And, adopt the method for photography to need a large amount of films of spend, also to pass through multiple working procedures such as shooting, flushing, projection, apparatus expensive, the material cost height, process is complicated, and sense cycle is very long.
Because fiber-like material quality softness has the big characteristics of retractility, so the chuck of the tested fiber of clamping is all being had certain requirement aspect clamping fastness and the bearing accuracy.And the instrument of present detection fibers material, have two kinds as the last chucks that use such as strength tester: fastening two derbies of screw of a kind of employing form.But find this chuck in use in using, because of the derby distortion produces the phenomenon that fiber skids and gets loose, poor easily to fiber clamp degree of reinforcing.It is inaccurate that this chuck also exists tested fiber to locate between two derbies of chuck, and the phenomenon that gets loose of skidding that produces, and for the multiply fiber, because that the multiply fiber is easy to is loose, this phenomenon often occurs especially.Other has a kind of chuck, adopt the mode of two fastening two derbies of screw, the fiber that has taken place though avoided derby in loading process, the to produce deformation phenomenon that gets loose, improved chuck structure stability, strengthened the clamping fastness, but still the orientation problem of unresolved fiber in chuck.And, more than two types of chucks all exist two derbies location inaccurate, the edge is difficult to alignment, thus cut staple influences the problem of testing.In addition, above-mentioned two kinds of chucks are all less than being connected with acoustic emission transducer.
Purpose of the present invention, be that a kind of fiber acoustic emission device will be provided, by a kind of improved chuck, the tested fiber of clamping securely, and can accurately locate and be coupled with the acoustic emission transducer sensor effectively and reach the purpose that the acoustic emission phenomenon to fibrous material detects, writes down, with material behaviors such as the elongation of research fibrous material, fractures.
Apparatus of the present invention are utilized the fibrous material principle that can transmit by solid material with the form of mechanism vibrations of the recurring structure acoustic emission phenomenon that changes, produce during fracture under external force, made a kind of anchor clamps, made tested fiber tested fiber when afterburning part of the present invention applies pulling force to tested fiber be gripped the slippage that can not come loose firmly with two chucks.For the stressing conditions of detection fibers, the dynamometry strainmeter that the utilization of this device is connected with a chuck, the situation that tested fiber is stressed passes to registering instrument after the perception, obtain the stress data of fiber in whole process.Simultaneously, by the another chuck, with the mechanical vibration that acoustic emission causes in loading process of tested fiber, be coupled on the piezoelectrics of the acoustic emission transducer sensor that is connected with this chuck, produce resonant vibration, and then be electrodes sense, convert electric signal to, pass to that Acoustic radiating instrument amplifies, filtering, frequency-selecting handles, and received by registering instrument at last, notes the acoustic emission phenomenon of fiber in whole testing process.Like this, apparatus of the present invention are by same registering instrument, have realized the synchronous recording to tested single or plurality of fibers stressing conditions and the whole process of acoustic emission phenomenon.
Fig. 1 is the member [1] of apparatus of the present invention chuck.
Fig. 2 is the member [4] of apparatus of the present invention chuck.
Fig. 3 is the formation sketch of apparatus of the present invention chuck.
Fig. 4 is the connection diagram of apparatus of the present invention chuck and acoustic emission transducer sensor.
Fig. 5 is the integrally-built apparent intention of acoustic radiating instrument for fibre material.
Fig. 6 adds the load-long curve of twisting filament and the collection of illustrative plates of fracture total counts of acoustic emission-extension curve when equalling zero for the twist.Wherein, curve [6-1] is the curve that characterizes fiber load-elongation relation, and curve [6-2] is the curve that characterizes elongate fiber-fracture total counts of acoustic emission relation.
Fig. 7 adds the collection of illustrative plates of the load-extension curve and the fracture total counts of acoustic emission-extension curve of twisting filament when equaling 1/centimetre for the twist.Wherein, curve [7-1] is the curve that characterizes fiber load-elongation relation, and curve [7-2] is the curve that characterizes elongate fiber-fracture total counts of acoustic emission relation.
Fig. 8 adds the collection of illustrative plates of the load-extension curve and the fracture total counts of acoustic emission-extension curve of twisting filament when equaling 2/centimetre for the twist.Wherein, curve [8-1] is the curve that characterizes fiber load-elongation relation, and curve [8-2] is the curve that characterizes elongate fiber-fracture total counts of acoustic emission relation.
Fig. 9 adds the collection of illustrative plates of the load-extension curve and the fracture total counts of acoustic emission-extension curve of twisting filament when equaling 3/centimetre for the twist.Wherein, curve [9-1] is the curve that characterizes fiber load-elongation relation, and curve [9-2] is the curve that characterizes elongate fiber-fracture total counts of acoustic emission relation.
Describe the details and the working condition of the concrete structure of apparatus of the present invention in detail below in conjunction with accompanying drawing.
As seen from Figure 3, the chuck that acoustic radiating instrument for fibre material provides by member shown in Figure 1 [1] and member [4] shown in Figure 2, forms with screw is fastening by the screw [5] on the hole [2] on the member [1], [3] and the member [4], [6], is complying with step [10] location.The material of member can adopt metal usually, also can select for use hard plastic to be made.But no matter select which kind of material for use, the faying face of two members requires smooth smooth, and is little with slit, the fastening back of screw.Because two members adopt two screws and the dual location of step, improved the resistance to overturning of chuck structure greatly, strengthened clamping fastness, and avoided being forbidden the phenomenon of the cut staple that causes by member [1], [4] location to tested fiber.Semi-enclosed hole is adopted in hole [3] on the member [1], makes member [1] as long as unscrew two trip bolts a little, just can remove and retract, and has increased the dirigibility of moving, and makes the tested fiber of loading and unloading convenient.Member shown in Figure 2 [4] has locating slot [9], and the width of locating slot is decided on fiber bundle diameters, is generally 1 millimeter, and its effect is that tested fiber is accurately located, and can prevent effectively that the loose and stressed back of multiply fiber from producing slippage.When using chuck that tested fiber is installed, as long as unscrew screw [11], [12] remove member [1], and fiber is put into locating slot [9], retract member [1] then, push down the end of tested fiber, screw screw [11], [12], the fastening jail of fiber, get final product in order to avoid stressed time pine is sliding.
Chuck [13] is by hole [7], [8] in the member [4] with acoustic emission transducer sensor [14] as can be seen from Fig. 4, connected with screw, require both connections to combine closely, can be coupled effectively to the acoustic emission transducer sensor by chuck to guarantee acoustic emission signal.Fastening as not using screw, also the bonding mode of useful binders is connected.
As shown in Figure 5, acoustic radiating instrument for fibre material is made of dynamometry part [15], anchor clamps [16], acoustic emission test part [17], afterburning part [18], recording section [19] five big parts.Wherein motor [20] is the power source of the afterburning part of acoustic radiating instrument for fibre material, by the screw rod [21] that links to each other chuck [13] is applied acting force.Tested fiber is then gripped by two chucks [13], [22] of holder part.Afterburning part applies acting force, and when tested fiber was down stretched, its acting force was transmitted to chuck [22] by tested fiber, and be the perception of dynamometry strainometer [23] institute, passing to strainmeter [24], is registering instrument [25] institute record at last, finishes detection, record to afterburning load condition.The acoustic emission phenomenon of tested fiber is by chuck [13], be coupled to acoustic emission transducer sensor [14], cause the resonant vibration of piezoelectrics in the acoustic emission transducer sensor, and be the perception of electrode institute, and convert electric signal to, pass to acoustic emission detection part [26], after processing such as amplification, filtering, frequency-selecting, be registering instrument [25] institute record, thereby finish to tested fiber in the whole process of stressed and the deformation that takes place, fracture the detection of acoustic emission situation and record.Like this, pass through anchor clamps, just make fiber in the applied elongation process, the acoustic emission phenomenon of following deformation and fracture and producing is by chuck [13], pass to emission transducer sensor [14], acoustic emission detector [26] be registering instrument [25] institute record, thereby obtaining the tested fiber of complete reflection loads in testing process-extends and extend-the tested fiber load-extension curve and the elongation-fracture total counts of acoustic emission curve of total counts of acoustic emission situation.By the resultant tested elongate fiber of this two sets of curves, crack conditions, reach the purpose of analyzing the fibrous material characteristic easily.Fig. 6,7,8, the 9th, the chart of making according to the experimental data of using acoustic radiating instrument for fibre material to record is analyzed the example of fibre breakage characteristic.
Fig. 6,7,8,9 is respectively that the twist is 0,1,2,3/centimetre load-extension curve [6-1], [7-1], [8-1], [9-1] and fracture total counts of acoustic emission-extension fracture total counts of acoustic emission-extension curve [6-2], [7-2], [8-2], [9-2] of polyester filament in stressed drawing process.Load-extension curve characterizes polyester filament in drawing process, the situation of change of load.Each step on fracture total counts of acoustic emission-extension curve is represented the acoustie emission event of polyester filament in drawing process, and characterizing in the polyester filament has a fiber that fracture has taken place.By Fig. 6,7,8,9 as can be seen, along with the increase of the polyester filament twist, the decline of the load that the fracture of initial several fibers causes in the polyester filament becomes not obvious gradually.The twist is that 0/centimetre polyester filament is in stressed drawing process, when first fibre breakage wherein, load-extension curve promptly drops, and along with the increase of the polyester filament twist, the drop of load-extension curve that the fracture of initial several fibers causes in the polyester filament becomes more and more not obvious.When the twist of polyester filament reached 3/centimetre, when the 3rd fibre breakage wherein, load-extension curve just dropped.Dotted line among Fig. 6,7,8,9 [6-3], [7-3], [7-4], [8-3], [8-4], [9-3], [9-4], [9-5] have shown this situation.By this example as can be seen, using acoustic radiating instrument for fibre material can be easy, quickly and accurately the polyester filament fracture process is detected.
Acoustic radiating instrument for fibre material is a kind of novel instrument, so have the not available function of some existing instruments, particularly apparatus of the present invention are coupled measured material and sensor by a kind of anchor clamps that are connected with acoustic emission transducing biography device, carefully thin to some bodies, the acoustic emission phenomenon of the materials such as the fiber that surface to volume ratio is big, film all can detect. A kind of improved anchor clamps that apparatus of the present invention provide, be specially adapted to fibrous material, can reach tested fiber clamping fastness height, the effect that positioning accuracy is good, has fibrous fracture elongation measure of spread in multifilament, the yarn, the Fast Measurement of single fiber fracture strength in the long filament, the multiple use such as number of fiber mensuration in the long filament. Simultaneously, apparatus of the present invention dynamometry part and acoustic emission test section are to work simultaneously, synchronous recording, thereby the synchronism of acquisition testing result is good, the degree of accuracy is also high. Use this instrumentation convenient, data are processed simple, have the required time of detection weak point, and the advantage that the cost of material is low can extensively as textile industry research, be measured the instrument of fibrous material characteristic.
Claims (4)
1, a kind of acoustic radiating instrument for fibre material comprises motor, the acoustic emission transducer sensor, and the dynamometry strainometer has the anchor clamps of two chucks, and registering instrument is characterized in that above-mentioned acoustic emission transducer sensor is connected with chuck.
2, a kind of acoustic radiating instrument for fibre material as claimed in claim 1, it is characterized in that above-mentioned chuck is fastening with screw with the hard material piece [4] of band locating slot [9], step [10] by the hard material piece [1] of band screw [2], semiclosed screw [3], the width of locating slot is decided on the diameter of institute's detection fibers, and the surface of contact between two material blocks requires smooth, smooth.
3, a kind of acoustic radiating instrument for fibre material as claimed in claim 1 or 2 is characterized in that above-mentioned acoustic emission transducer sensor and its chuck are fastening by screw.
4, a kind of acoustic radiating instrument for fibre material as claimed in claim 1 or 2 is characterized in that above-mentioned acoustic transducer and its chuck are to link to each other by the bonding of bonding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105476 CN1034997A (en) | 1988-02-04 | 1988-02-04 | Acoustic radiating instrument for fibre material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105476 CN1034997A (en) | 1988-02-04 | 1988-02-04 | Acoustic radiating instrument for fibre material |
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| Publication Number | Publication Date |
|---|---|
| CN1034997A true CN1034997A (en) | 1989-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 88105476 Pending CN1034997A (en) | 1988-02-04 | 1988-02-04 | Acoustic radiating instrument for fibre material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109580353A (en) * | 2018-12-21 | 2019-04-05 | 东华大学 | One kind is for fibre bundle tension failure single-point type electroacoustic measurement apparatus and method and purposes |
| CN109682677A (en) * | 2018-12-29 | 2019-04-26 | 上海工程技术大学 | A kind of fibrous fracture acoustic emission analysis method based on Hilbert-Huang transform |
| CN109682678A (en) * | 2018-12-29 | 2019-04-26 | 上海工程技术大学 | A kind of analysis method of fibrous fracture sound |
-
1988
- 1988-02-04 CN CN 88105476 patent/CN1034997A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109580353A (en) * | 2018-12-21 | 2019-04-05 | 东华大学 | One kind is for fibre bundle tension failure single-point type electroacoustic measurement apparatus and method and purposes |
| CN109682677A (en) * | 2018-12-29 | 2019-04-26 | 上海工程技术大学 | A kind of fibrous fracture acoustic emission analysis method based on Hilbert-Huang transform |
| CN109682678A (en) * | 2018-12-29 | 2019-04-26 | 上海工程技术大学 | A kind of analysis method of fibrous fracture sound |
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