CN102879468B - Double-bending-element ultrasonic sensing test device and method for evaluating rock damage - Google Patents
Double-bending-element ultrasonic sensing test device and method for evaluating rock damage Download PDFInfo
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Abstract
The invention discloses a double-bending-element ultrasonic sensing test device for evaluating rock damage. The double-bending-element ultrasonic sensing test device comprises a pressure chamber, a rock sample and an ultrasonic probe, wherein the pressure chamber comprises a housing, a pressure head and a base; the rock sample is positioned between the base and the pressure head; grooves are formed in the sides of the pressure head and the base, in contact with the rock sample; seat cores are arranged in the grooves; the ultrasonic probe comprises an ultrasonic emission probe and an ultrasonic receiving probe; the ultrasonic emission probe and the ultrasonic receiving probe are placed in the pressure head and the seat cores of the base respectively; each ultrasonic probe adopts a double-bending-element structure formed by bonding two bending elements in parallel; and a signal generator, a signal amplifier, an oscilloscope, a first circuit converter and a second circuit converter are arranged outside the pressure chamber. The connection mode of the two bending elements is changed through the circuit converters, the vibration directions of the bending elements are controlled for achieving sequential excitation of longitudinal waves and horizontal waves, the test device is suitable for a rock mechanic ultrasonic test, and the rock damage characteristic is evaluated through wave speed change.
Description
Technical field
The invention belongs to Supersonic field, be specifically related to a kind of unit's supersonic sensing test unit of the tangent bend for assessment of damage of rock and method.
Background technology
Ultrasonic listening technology is applied increasingly extensive in rock mechanics, and ultrasonic listening has easy to operate, not damaged, and cost is low, obtains the advantages such as Rock information amount is large.In rock mechanics supersonic test, velocity of wave and rock mass density, water cut, elastic modulus, uniaxial compressive strength have close relationship, and ultrasonic attenuation and Rock Damage and internal crack also have certain relation.Under current test condition, compressional wave is tested because probe is easy to manufacture, and signal produces simply and signal is easily identified and is used widely.The ripple ratio of compressional wave and shear wave can be inquired into the Poisson ratio of rock, thereby the anisotropy of evaluating material, but because place, shear wave source must produce shearing force, and transverse wave speed is slower than compressional wave, cause Mintrop wave to be difficult to identification, above reason has limited the application of shear wave probe in rock mechanics.The rock ultrasonic probe generally using mostly at present is short cylindrical form piezoceramics crystal.Most ultrasonic probes can not bear axle pressure and confined pressure, therefore can only under zero stress condition, use, and do not meet rock condition of triaxial stress; Certainly also there is the ultrasonic probe of making in the base that adopts the form of a plurality of crystal arrays to be inlaid into rock sample and pressure head, but it is oversize, synchronously bad between a plurality of array crystal of acoustic signals, decay is serious, to such an extent as to the velocity of wave of surveying is discrete seriously, poor repeatability, increased the difficulty of signal interpretation.Zhejiang University once published and utilizes the device of piezoelectric ceramics test soil sample velocity of wave and apply for a patent (patent No.: 02261611.X and 200520013094.2), describe the making treatment technology of piezoceramic transducer in detail, its invention achievement is mainly formed transmitting unit and received unit by single flexure element wafer, usable range only limits in soil, can not in same soil sample test, automatically switch and produce compressional wave or shear wave.
In a word, at present rock ultrasonic sensor produces the more of compressional wave type, possess to switch that to produce the sensor of compressional wave and shear wave ability few, and volume is large, and distorted signals is serious.Given this, be necessary very much to research and develop a kind of can be under triaxial stress state (rock is at underground true stress condition) can produce as required the small-scale ultrasonic probe of compressional wave and shear wave, the acoustic signals of probe is clear simultaneously, distortion is little, the robustness of system is high.Flexure element/flexible first chip-type of selecting suitable dimension, by preferred arrangement piezoelectric ceramics polarised direction, in conjunction with rock material characteristic selective excitation energy, designing a kind of flexure element type ultrasonic sensor for assessment of damage of rock is a feasible method.
Summary of the invention
The invention provides a kind of unit's supersonic sensing test unit of the tangent bend for assessment of damage of rock and method, this installs differential generation compressional wave or shear wave, thereby by the voltage at contrast echo ripple transmitting probe place and the change in voltage at ultrasound wave receiving transducer place, determine the propagation characteristic of ultrasound wave in rock, and then the lithology of rock and inner structure are analyzed.
What the present invention used is the principle of work of flexure element type piezoelectric ceramics, and flexure element wafer (bender element) is widely used in sensor, and under fixing voltage, flexure element can produce yaw displacement.Single flexure element wafer is comprised of two piezoelectric ceramic pieces and middle one deck elastic beam (adopting brass) more, and in potsherd above and below, evenly plates one deck silver or nickel is done electrode, makes in potsherd, to form electric field, thereby makes wafer bending distortion.
Correlation theory and test show that the deformation displacement of flexure element wafer under voltage is:
δ=6d
13EV(h+h
0)l
2/[8Eh
3+12Eh
0h
2+6Eh
0 2h+E
0h
0 3]
δ---yaw displacement
D
13---piezoelectric constant
H
0---elastic beam thickness
H---piezoelectric ceramic piece thickness
V---driving voltage
L---semi-girder length
E, E
0---the elastic modulus of piezoelectric patches, elastic beam
At ultrasound wave transmitting probe place, apply the voltage signal of variation, due to inverse piezoelectric effect, make ceramic wafers vibrations produce ultrasound wave; At receiving end probe place, because causing wafer vibrations, the ultrasound wave passing to produces direct piezo electric effect, thus the voltage signal changing.Thereby the voltage by contrast transmitting probe place is determined the propagation characteristic of ultrasound wave in rock with the change in voltage of accepting probe place, and then the lithology of rock and inner structure are analyzed.
Technical scheme of the present invention is achieved in that
A tangent bend unit supersonic sensing test unit for assessment of damage of rock, comprises pressure chamber, rock sample and ultrasonic probe;
Described pressure chamber, comprises shell, pressure head and base, and base is placed in shell, and is positioned at outer casing bottom, and a part for pressure head enters in shell by shell upper opening, and the axis of base and the axis of pressure head overlap;
Described rock sample is between base and pressure head, and rock sample adopts heat-shrink tube to seal, and prevents that hydraulic oil from contacting with rock sample, and heat-shrink tube lower end is fixedly connected with base, and heat-shrink tube upper end is fixedly connected with pressure head; Pressure head and rock sample contact side and base and rock sample contact side all have groove, and described groove is positioned on the axis of pressure head and base, and are all placed with a core in two grooves;
Described ultrasonic probe has two, be respectively ultrasound wave transmitting probe and ultrasound wave receiving transducer, ultrasound wave transmitting probe is placed in the seat in-core of pressure head, and is positioned at the position, axis of this core, ultrasound wave receiving transducer is placed in the seat in-core of base, and is positioned at the position, axis of this core;
Two ultrasonic probes are two flexure elements tangent bend meta structure that bonding forms side by side; One end that flexure element contacts with rock sample is the apical margin of flexure element, the other end is the bottom of flexure element, the apical margin part of two flexure elements bonds by high-strength structureal adhesives, prevent that in vibration processes, separate condition appears in this end, the bottom of two flexure elements is welded and shielded cable is drawn with shielded cable;
Described pressure chamber is outside equipped with signal generator, signal amplifier, oscillograph, the first circuit converter and second circuit converter; Signal generator output terminal connects respectively signal amplifier input end and oscillograph input end, signal amplifier output terminal connects the first circuit converter input end, the output terminal of the first circuit converter connects the shielded cable that ultrasound wave transmitting probe is drawn, the shielded cable that ultrasound wave receiving transducer is drawn connects the input end of second circuit converter, and the output terminal of second circuit converter connects oscillographic input end by shielded cable.
Described signal generator output terminal connects respectively signal amplifier input end and oscillograph input end by shielded cable; Described signal amplifier output terminal connects the first circuit converter input end by shielded cable.
Described pressure head outside and chassis outer side all have wire guide, for drawing the shielded cable of flexure element bottom welding, and at wire guide place, adopt sealing bolt to seal.
A rectangle sulculus is opened respectively in the end face center of described rock sample and bottom center position, and the size of this rectangle sulculus is determined according to the amplitude of the size of tangent bend meta structure and vibration thereof, and two rectangle sulculuses are consistent at long axis direction; On rock sample, opening rectangle sulculus is in order to prevent from crushing flexure element, at flexure element apical margin, adopts the colloid coupling that rigidity is moderate, to produce shear stress in flexure element and rock sample, transmits shear wave.
Animi resin is filled with the space of seat core in described ultrasonic probe one end, makes ultrasonic probe and seat core be bonded to integral body; The other end of ultrasonic probe stretches out a core and contacts with rock sample, and this end is filled with soft silica gel with the space of seat core, this soft silica gel is for waterproof and sealing, soft silica gel rigidity can not be excessive in order to avoid affect the vibration of ultrasonic probe, in soft silica gel, two flexure elements of ultrasonic probe can free vibration.
Described the first circuit converter and second circuit converter are to control by the different connection mode of tangent bend meta structure the device that is applied to the voltage direction on tangent bend meta structure.
The method that adopts the first supersonic sensing test unit of the above-mentioned tangent bend for assessment of damage of rock, comprises the steps:
Step 1: after connecting device and switching on power, select the required waveform of test on signal generator, regulating frequency, amplitude and phase place;
Step 2: signal generator produces two paths of signals: a road signal transfers to oscilloscope display waveform, and another road signal transfers to signal amplifier and amplifies;
Step 3: the signal after amplification transfers to ultrasound wave transmitting probe through the first circuit converter, selects ultrasound wave transmitting probe to produce compressional wave or shear wave by the first circuit converter;
Each flexure element can produce alternately vibrations and to the right left under the effect that changes voltage, when flexure element polarised direction is fixedly time, if the size and Orientation of driving voltage changes, due to inverse piezoelectric effect, tangent bend unit produces coordinates vibrations, by changing polarised direction and the mode of connection, the apical margin of realizing at flexure element produces compressional wave or shear wave, because the apical margin of two flexure elements is bonded together, and two flexure element center sections do not bond, when the voltage system that two flexure elements are applied is vibrated two flexure elements round about, the separation of periodically expanding of two flexure element center sections, and because the expansion of flexure element center section changes, the telescopic variation that the apical margin of two flexure elements produces along flexure element direction, thereby make flexure element top produce compressional wave, by changing the connection mode of flexure element, change the direction of vibration of two flexure elements, when the voltage system that two flexure elements are applied makes two flexure elements vibrate to equidirectional, center section can be not separated, two flexure element side-to-side vibrationss simultaneously, thereby produce shear wave at flexure element apical margin, the present invention adopts circuit converter control the connection mode of tangent bend unit and be applied to the voltage direction in tangent bend unit, ultrasound wave transmitting probe can be by the required generation compressional wave of experiment or shear wave like this,
Step 4: ultrasound wave is propagated in rock sample, signal transfers to ultrasound wave receiving transducer;
Step 5: ultrasonic signal is converted to electric signal and transfers to oscillograph through the second converter and carries out waveform demonstration;
Step 6: by the waveform of the two paths of signals that shows on oscillograph, can analyze the characteristic of rock sample.
Beneficial effect:
The present invention changes the connection mode of tangent bend unit by circuit converter, thereby controls the direction of vibration of flexure element, and the order that realizes compressional wave and shear wave excites.Circuit connection of the present invention all adopts shielded cable, reduces the distortion that receives waveform, makes test findings reliable.Apparatus of the present invention are applicable to rock mechanics supersonic test, ensureing under the prerequisite of hydraulic seal, can under triaxial stress state, work, automatically switch and produce compressional wave or shear wave, by velocity of wave, change assessment damage of rock characteristic, and the robustness higher due to system can obtain more parameters,acoustic, meet rock mechanics scientific research personnel's research needs.
Accompanying drawing explanation
Fig. 1 is the unit of the tangent bend for assessment of the damage of rock supersonic sensing test unit structural representation of the specific embodiment of the invention;
Fig. 2 is the seat core sectional view of the specific embodiment of the invention;
Fig. 3 (a) is the schematic diagram of sensor emission compressional wave;
Connection mode when Fig. 3 (b) is transmitting compressional wave;
Fig. 4 (a) is the schematic diagram of sensor emission shear wave;
Connection mode when Fig. 4 (b) is transmitting shear wave;
Fig. 5 is the pressure head sectional view of present embodiment.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is described further.
Tangent bend for assessment of the damage of rock unit supersonic sensing test unit of present embodiment, as shown in Figure 1, comprises pressure chamber, rock sample 8 and ultrasonic probe;
Pressure chamber comprises shell 2, pressure head 1 and base 12, and base 12 is placed in shell 2, and is positioned at shell 2 bottoms, and a part for pressure head 1 enters in shell 2 by shell 2 upper openings, and the axis of the axis of base 12 and pressure head 1 overlaps;
Rock sample 8 is between base 12 and pressure head 1, rock sample 8 adopts heat-shrink tube 9 to seal, and heat-shrink tube 9 is a kind of rubber tubes, prevents that hydraulic oil from contacting with rock sample 8, and heat-shrink tube 9 lower ends are fixedly connected with base 12, heat-shrink tube 9 upper ends are fixedly connected with pressure head 1; Pressure head 1 all has groove with rock sample 8 contact sides, base 12 with rock sample 8 contact sides, and two grooves are positioned on the axis of pressure head 1 and base 12, and are placed with respectively a core 4,15 in two grooves;
Ultrasonic probe has two, be respectively ultrasound wave transmitting probe and ultrasound wave receiving transducer, ultrasound wave transmitting probe is placed in the seat core 4 of pressure head 1, and is positioned at the position, axis of this core 4, ultrasound wave receiving transducer is placed in the seat core 15 of base 12, and is positioned at the position, axis of this core 15;
Two ultrasonic probes are two flexure elements tangent bend meta structure 5 that bonding forms side by side; The apical margin that one end that flexure element contacts with rock sample 8 is flexure element, the bottom that the other end is flexure element, the apical margin local bonding of two flexure elements, the bottom of two flexure elements is welded and shielded cable 13,16 is drawn with shielded cable 13,16;
Pressure chamber is outside equipped with signal generator, signal amplifier, oscillograph, the first circuit converter and second circuit converter; Signal generator output terminal connects respectively signal amplifier input end and oscillograph input end, signal amplifier output terminal connects the first circuit converter input end, the output terminal of the first circuit converter connects the shielded cable that ultrasound wave transmitting probe is drawn, the shielded cable that ultrasound wave receiving transducer is drawn connects the input end of second circuit converter, and the output terminal of second circuit converter connects oscillographic input end by shielded cable; Described signal generator output terminal connects respectively signal amplifier input end and oscillograph input end by shielded cable; Described signal amplifier output terminal connects the first circuit converter input end by shielded cable.
As shown in Figure 5, pressure head 1 outside and base 12 outsides all have wire guide, be respectively used to draw the shielded cable 16,13 of flexure element bottom welding, and at the wire guide place in pressure head 1 outboard wire hole and base 12 outsides, adopt sealing bolt 17,11 to seal respectively.
In present embodiment, in the end face center of rock sample, open one and coordinate with flexure element wafer the rectangle sulculus being coupled, the wide 2mm of this rectangle sulculus, dark 2mm, through experimental results show that, this rectangle sulculus can not bring obvious errors to the measurement of ultrasonic velocity, can not affect the triaxial strength value of rock sample yet.
Animi resin 3 is filled with the space of seat core 4 in ultrasonic probe one end, makes ultrasonic probe and seat core 4 be bonded to integral body; The other end of ultrasonic probe stretches out a core 4 and contacts with rock sample 8, and this end is filled with soft silica gel 6 with the space of seat core 4, this soft silica gel 6 is for waterproof and sealing, soft silica gel 6 rigidity can not be excessive in order to avoid affect the vibration of ultrasonic probe, in soft silica gel 6, two flexure elements of ultrasonic probe can free vibration.
In present embodiment, adopt T226-A4SS-303X type flexure element, by two relative potsherds of polarised direction, formed, the potsherd of flexure element is of a size of 31.76 * 12.70 * 0.66mm, can be arranged in the base 12 of pressure chamber and the seat core 4,15 of pressure head 1, the stress causing with minimizing supersonic sensing test unit is concentrated, and is convenient to change ultrasonic probe.As shown in Figure 2, the apical margin that one end that flexure element contacts with rock sample is flexure element, the bottom that the other end is flexure element, the apical margin part of two flexure elements bonds by high-strength structureal adhesives 14, prevents that in vibration processes, separate condition appears in this end.
When testing, by three-axis tester, to base 12 and pressure head 1, apply axial pressure, can test the relation of ultrasound wave and stress, and can utilize the propagation characteristic of ultrasound wave under different stress conditions to carry out prediction rock unstable failure, the supersonic sensing test unit of present embodiment can bear axial pressure and the confined pressure 10 under condition of triaxial stress, meets condition of triaxial stress.
Described the first circuit converter and second circuit converter are to control by the different connection mode of tangent bend meta structure the device that is applied to the voltage direction on tangent bend meta structure.
By circuit converter, realizing the automatic switchover (change circuit converter in connection mode) of compressional wave and shear wave and the setting of tangent bend meta structure has multiplely, and this depends on the type of selected flexure element.
Because different chips arrangement and connection mode can be different, the T226-A4SS-303X type wafer that the present embodiment of only take is below selected is example explanation.
As shown in Fig. 3 (a), (b), the voltage direction being applied on tangent bend meta structure 5 makes the direction of vibration of two flexure elements contrary, because two flexure element bottoms are fixed by animi resin 3, two flexure element apical margin parts are bondd by high-strength structureal adhesives, this apical margin is filled by soft silica gel 6 with the space of seat core 4, the position that soft silica gel 6 is filled can vibrate, and the direction of vibration of two flexure elements is contrary, in the middle of can making like this tangent bend meta structure 5, belly expands, and telescopic variation occurs flexure element apical margin on axis direction.Because this change in voltage is continuous, so flexure element apical margin telescopic variation is also continuous, at flexure element apical margin, will produce the compressional wave that is parallel to direction of vibration.
As Fig. 4 (a) with (b), the voltage direction being applied on tangent bend meta structure 5 makes the direction of vibration of two flexure elements identical, because two flexure element bottoms are fixed by animi resin 3, flexure element bottom can not vibrate, and the position of being filled by soft silica gel 6 and hang end can free side-to-side vibrations, the direction of vibration of two flexure elements is consistent, and this vibration is also with voltage continually varying, just produces the shear wave perpendicular to direction of vibration at flexure element top.
By Fig. 3 (b), to the conversion of Fig. 4 (b), be the variation of connection mode, can realize by circuit converter.
Fig. 3 and Fig. 4 are the mechanism of action of two kinds of different ripples of tangent bend meta structure 5 transmittings of ultrasound wave transmitting probe, it at ultrasound wave receiving transducer, is the inverse process of ultrasound wave transmitting probe, to drive the vibration of tangent bend unit by the ultrasound wave transmitting by rock (compressional wave or shear wave), make ultrasonic signal change into electric signal, through shielded cable 13, import oscillograph into again, also can directly data be imported in computing machine by different communication modes.
The method that adopts the first supersonic sensing test unit of the above-mentioned tangent bend for assessment of damage of rock, comprises the steps:
Step 1: after connecting device and switching on power, select the required waveform of test on signal generator, regulating frequency, amplitude and phase place;
Step 2: signal generator produces two paths of signals: a road signal transfers to oscilloscope display waveform, and another road signal transfers to signal amplifier and amplifies;
Step 3: the signal after amplification transfers to ultrasound wave transmitting probe through the first circuit converter, selects ultrasound wave transmitting probe to produce compressional wave or shear wave by the first circuit converter;
Each flexure element can produce alternately vibrations and to the right left under the effect that changes voltage, when flexure element polarised direction is fixedly time, if the size and Orientation of driving voltage changes, due to inverse piezoelectric effect, tangent bend unit produces coordinates vibrations, by changing polarised direction and the mode of connection, the apical margin of realizing at flexure element produces compressional wave or shear wave, because the apical margin of two flexure elements is bonded together, and two flexure element center sections do not bond, when the voltage system that two flexure elements are applied is vibrated two flexure elements round about, the separation of periodically expanding of two flexure element center sections, and because the expansion of flexure element center section changes, the telescopic variation that the apical margin of two flexure elements produces along flexure element direction, thereby make flexure element top produce compressional wave, by changing the connection mode of flexure element, change the direction of vibration of two flexure elements, when the voltage system that two flexure elements are applied makes two flexure elements vibrate to equidirectional, center section can be not separated, two flexure element side-to-side vibrationss simultaneously, thereby produce shear wave at flexure element apical margin, adopt circuit converter control the connection mode of tangent bend unit and be applied to the voltage direction in tangent bend unit, ultrasound wave transmitting probe can be by the required generation compressional wave of experiment or shear wave like this,
Step 4: ultrasound wave is propagated in rock sample, signal transfers to ultrasound wave receiving transducer;
Step 5: ultrasonic signal is converted to electric signal and transfers to oscillograph through the second converter and carries out waveform demonstration;
Step 6: by the waveform of the two paths of signals that shows on oscillograph, can analyze the characteristic of rock sample.
In present embodiment, because the wave impedance of flexure element and the difference of impedance of rock are apart from larger, the coupling of flexure element and rock sample need to be passed through special processing, to carry out transition coupling with the relatively high colloid 7 of rigidity, and select suitable waveform and stimulating frequency according to rock character, can effectively avoid overshoot and near-field effect, can receive waveform clearly at receiving end equally, if the Oscillation Amplitude of ultrasound wave transmitting probe is enough large, under the condition of signal amplifier, also can suitably use not having.
Claims (8)
1. for assessment of a tangent bend unit supersonic sensing test unit for damage of rock, it is characterized in that: comprise pressure chamber, rock sample and ultrasonic probe;
Described pressure chamber, comprises shell, pressure head and base, and base is placed in shell, and is positioned at outer casing bottom, and a part for pressure head enters in shell by shell upper opening, and the axis of base and the axis of pressure head overlap;
Described rock sample is between base and pressure head, and rock sample adopts heat-shrink tube to seal, and heat-shrink tube lower end is fixedly connected with base, and heat-shrink tube upper end is fixedly connected with pressure head; Pressure head and rock sample contact side and base and rock sample contact side all have groove, and described groove is positioned on the axis of pressure head and base, in two grooves, are all placed with a core;
Described ultrasonic probe has two, be respectively ultrasound wave transmitting probe and ultrasound wave receiving transducer, ultrasound wave transmitting probe is placed in the seat in-core of pressure head, and is positioned at the position, axis of this core, ultrasound wave receiving transducer is placed in the seat in-core of base, and is positioned at the position, axis of this core;
Two ultrasonic probes are two flexure elements tangent bend meta structure that bonding forms side by side; One end that flexure element contacts with rock sample is the apical margin of flexure element, the bottom that the other end is flexure element, and the apical margin local bonding of two flexure elements, the bottom of two flexure elements is welded and shielded cable is drawn with shielded cable;
Described pressure chamber is outside equipped with signal generator, signal amplifier, oscillograph, the first circuit converter and second circuit converter, described the first circuit converter and second circuit converter are to control by the different connection mode of tangent bend meta structure the device that is applied to the voltage direction on tangent bend meta structure, signal generator output terminal connects signal amplifier input end and oscillograph input end, signal amplifier output terminal connects the first circuit converter input end, the output terminal of the first circuit converter connects the shielded cable that ultrasound wave transmitting probe is drawn, the shielded cable that ultrasound wave receiving transducer is drawn connects the input end of second circuit converter, the output terminal of second circuit converter connects oscillographic input end by shielded cable.
2. the tangent bend for assessment of damage of rock according to claim 1 unit supersonic sensing test unit, it is characterized in that: described pressure head outside and chassis outer side all have wire guide, for drawing the shielded cable of flexure element bottom welding, and at wire guide place, adopt sealing bolt to seal.
3. the tangent bend for assessment of damage of rock according to claim 1 unit supersonic sensing test unit, it is characterized in that: a rectangle sulculus is opened respectively in the end face center of described rock sample and bottom center position, the size of this rectangle sulculus is determined according to the amplitude of the size of tangent bend meta structure and vibration thereof, and two rectangle sulculuses are consistent at long axis direction.
4. the tangent bend for assessment of damage of rock according to claim 1 unit supersonic sensing test unit, it is characterized in that: animi resin is filled with the space of seat core in described ultrasonic probe one end, the other end of ultrasonic probe stretches out a core and contacts with rock sample, and this end is filled with soft silica gel with the space of seat core, makes two flexure elements of ultrasonic probe can free vibration.
5. the first supersonic sensing test unit of the tangent bend for assessment of damage of rock according to claim 1, is characterized in that: in described tangent bend meta structure, the apical margin part of two flexure elements bonds by high-strength structureal adhesives.
6. the first supersonic sensing test unit of the tangent bend for assessment of damage of rock according to claim 1, is characterized in that: described signal generator output terminal connects signal amplifier input end and oscillograph input end by shielded cable.
7. the first supersonic sensing test unit of the tangent bend for assessment of damage of rock according to claim 1, is characterized in that: described signal amplifier output terminal connects the first circuit converter input end by shielded cable.
8. adopt the method for the first supersonic sensing test unit of the tangent bend for assessment of damage of rock claimed in claim 1, it is characterized in that: comprise the steps:
Step 1: after connecting device and switching on power, select the required waveform of test on signal generator, regulating frequency, amplitude and phase place;
Step 2: signal generator produces two paths of signals: a road signal transfers to oscilloscope display waveform, and another road signal transfers to signal amplifier and amplifies;
Step 3: the signal after amplification transfers to ultrasound wave transmitting probe through the first circuit converter, selects ultrasound wave transmitting probe to produce compressional wave or shear wave by the first circuit converter;
When the voltage system that two flexure elements are applied is vibrated two flexure elements round about, the separation of periodically expanding of two flexure element center sections, and because the expansion of flexure element center section changes, the telescopic variation that the apical margin of two flexure elements produces along flexure element direction, thus make flexure element top produce compressional wave; By changing the connection mode of flexure element, change the direction of vibration of two flexure elements, when the voltage system that two flexure elements are applied makes two flexure elements vibrate to equidirectional, center section can be not separated, two flexure element side-to-side vibrationss simultaneously, thus at flexure element apical margin, produce shear wave;
Step 4: ultrasound wave is propagated in rock sample, signal transfers to ultrasound wave receiving transducer;
Step 5: ultrasonic signal is converted to electric signal and transfers to oscillograph through the second converter and carries out waveform demonstration;
Step 6: by the waveform of the two paths of signals that shows on oscillograph, can analyze the characteristic of rock sample.
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