CN104007179B - Determination apparatus for surface internal stress of polymer plane thin-plate product and implementation method thereof - Google Patents
Determination apparatus for surface internal stress of polymer plane thin-plate product and implementation method thereof Download PDFInfo
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- CN104007179B CN104007179B CN201410197210.4A CN201410197210A CN104007179B CN 104007179 B CN104007179 B CN 104007179B CN 201410197210 A CN201410197210 A CN 201410197210A CN 104007179 B CN104007179 B CN 104007179B
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Abstract
The invention provides a determination apparatus for surface internal stress of a polymer plane thin-plate product and an implementation method thereof, belonging to the field of material performance testing. The experimental apparatus comprises three parts, namely, a mechanical device, a servo driving device and an ultrasonic transmitting/receiving measuring device. The mechanical device part comprises a horizontal base, an I-shaped support frame, a rectangular support frame, a rear support plate, a static chute mechanism, a dynamic chute mechanism and a ball screw chute mechanism. The servo driving device is composed of a servo motor and an electric control part which precisely controls the rotation of the motor through a servo controller. The ultrasonic transmitting/receiving measuring device excites a piezoelectric ceramic to generate an ultrasonic signal and transmits collected data to a host computer for processing. The determination apparatus provided by the invention has a high integration degree, is simple to operate and can realize fast and accurate measurement of surface internal stress of a polymer plane thin-plate.
Description
Technical field
The present invention relates to a kind of based on R wave propagation principle measurement surfaces of polymeric articles planted agent
The device of power and implementation, belong to material property detection field.
Background technology
Polymer thin slab products particularly integration engineering polymer thin slab products (thickness 1～3mm)
It is widely used in aerospace field and other high-tech areas, but in its extrusion or injection
During machine-shaping, melt in die cavity owing to inhomogeneous cooling is even, flowing uneven or
It is the impact of the melt plasticizing composite factor such as uneven itself, causes final molding product surface to produce
Raw internal stress, the existence of this surface internal stress, goods can be made to produce warpage, deform and even can
Produce blind crack at product surface, finally affect the optical property of polymer thin slab products and make
Use the life-span.Existing polymeric material device for measuring properties cannot realize polymer thin slab products
The qualitative, quantitative of surface internal stress distribution is measured.
The present invention is based on following measuring method:
The present invention is reason based on the ultrasound wave Vocal cord injection when homogeneous solid Propagation
Opinion basis, uses R wave (surface wave) with the pattern of transmission, is arranged on poly-by two angle probes
The optional position of compound sheet products, when polymer sheet product surface regional area exists planted agent
During power, bulk modulus and density value in this region will change, when surface wave leads to
When crossing this region, its spread speed also will change therewith, and its theoretical formula is as follows:
Wherein V-penetrates the velocity of wave that the ultrasound wave of polymer thin slab products is surveyed, m.s-1；V0-poly-
The velocity of wave of ultrasound wave, m.s during compound sheet products internal stress free state-1(determining value for known)；
σ-medium internal stress, MPa；K-sonoelastic coefficient, m2.N-1；This coefficient is and density of material
With a closely-related parameter such as elastic modelling quantity, for high molecular polymer, it is impossible to logical
Cross existing laboratory facilities and correlation theory is measured or calculates the sound bullet of certain polymeric material
Property coefficient.
The present invention based on Vocal cord injection obtain medium internal stress with transmitted through ultrasonic velocity
There is concordance and be verified by experiment.By comparing ultrasonic velocity V and V0, can
To be effectively shielded from the sonoelastic coefficient K being difficult to measure, it is achieved polymer thin slab products internal stress
The observation measurements of distribution.Its theoretical formula is as follows:
Wherein δ-ultrasonic velocity coefficient；V0Ultrasonic when-polymer thin slab products does not has stress
Wave sound speed；The V-ultrasound wave velocity of sound by polymer thin slab products optional position；Work as polymer thin
When slab products locally lies in action of pulling stress, during according to Vocal cord injection ultrasound wave by this region
Spread speed reduce, now V < V0, δ < 0；；When polymer thin slab products locally lies in pressure
During stress effect, increased by spread speed during this region according to Vocal cord injection ultrasound wave,
Now V > V0, δ > 0；In the presence of polymer thin slab products local does not has stress, now V=V0,
δ=0.σ increases with the increase of | δ |.Thus avoid the sonoelastic coefficient being difficult to measure, permissible
Fast qualitative measures the surface internal stress distribution in the whole region of polymer sheet.
The present invention realizes ultrasonic velocity based on difference measurement principle in the same direction (as shown in Figure 1)
Accurately measure.The measurement of ultrasonic velocity based on transmission mode, be by measure transmitting probe with
Flight time between receiving transducer and distance between the two realize.Its computing formula is as follows
Wherein d0-transmitting probe and the initial mounting distance of acceptance probe, m；t0-initial installation position
The flight time of ultrasonic measurement when putting, s；d1The invariant position of-holding transmitting probe, moves
The dynamic distance accepted after popping one's head in, m；t1-distance is d1Time ultrasound wave flight time, s；Δd-
Accept the distance of probe movement, m；The flight time of the transmission ultrasonic wave of Δ t-Δ d distance, s.
The present invention, based on servo-drive principle, accurately calculates the displacement Δ d accepting probe,
Its computing formula is as follows
Δ d=n s (4)
The number of turns that wherein n-servomotor rotates, r；The helical pitch of s-screw mandrel, mm/r.
Summary of the invention
Object of the present invention is to provide a kind of polymer plane sheet products surface internal stress
Determinator and implementation, it is for existing polymer sheet surface internal stress measuring device
Cannot realize lossless fast quantification to measure, this assay method is propagated in media as well according to ultrasound wave
Vocal cord injection and difference measurement principle in the same direction, by leading screw servo-actuating device, it is achieved polymerization
The accurate mensuration of thing sheet products surface internal stress distribution.
For achieving the above object, the technical solution used in the present invention is a kind of polymer plane thin plate
The determinator of product surface internal stress and implementation, wherein, one of the present invention is gathered
The determinator of compound planar sheet product surface internal stress includes that machinery, servo-drive fill
Put, ultrasonic emitting/reception measurement apparatus.
Specifically, machinery include horizontal base, I-shaped support frame, rectangular support frame,
Rear bearing sheet, quiet slide way mechanism, dynamic slide way mechanism and ball screw slide way mechanism；I shape props up
Support is fixed on base by the connecting bolt of M8, and quiet slide way mechanism is by four M4's
Connecting bolt and I-shaped support frame connect；Quiet slide way mechanism include base plate, two chute limits,
Slide block and chute guider screw；In quiet slide way mechanism, controlled by rotary chute guider screw
The movement of slide block, two chute limits and base plate are to be linked together by the connecting bolt of four M4,
Slide block is connected with rectangular probe fixture block by pretension bolt, and the end of probe fixture block is clamped with ultrasonic
Ripple accepts probe, just can realize the clamping of ultrasound probe by controlling pretension bolt.
Rectangular support frame is fixed on base by the connecting bolt of four M8, rectangular support frame
It is connected with ball screw slide way mechanism by the connecting bolt of four M4；Ball screw chute machine
Structure includes base plate, two chute limits, connection sliding block and ball screw；Two chute limits and base plate
Being to be linked together by the connecting bolt of four M4, connection sliding block is embedded in two chute limits and the end
In the chute of plate composition, ball screw is connected by the screwed hole on base plate and connection sliding block, rotation
Tumbler ballscrew can drive connection sliding block transverse shifting, and connection sliding block connects spiral shell by a M4
Bolt and dynamic slide way mechanism connect.Dynamic slide way mechanism includes base plate, two chute limits, slide block and cunning
Groove guider screw, slide block is clamped with ultrasonic emitting by probe fixture block and pops one's head in, rolled by rotation
Ballscrew just can drive ultrasound wave to accept probe transverse shifting.
Rear bearing sheet is fixed on base plate by two M8 screws, and rear bearing sheet both sides are marked respectively
There is graduation mark.Rear bearing sheet is embedded in horizontal shore, can level be propped up with holding screw
Any position on rear bearing sheet fixed by support, and horizontal shore is marked with graduation mark, to be measured thin
Plate sample is placed on horizontal shore.
Servo drive is grouped into by servomotor and electric control part, and electric control part is divided and included electrical equipment
Cabinet, servo controller, 24V Switching Power Supply, power supply indicator, scram button, servomotor
Start button, servo controller is by A/D communication cable, D/A communication cable and host computer
Realizing the exchange of information, host computer is provided with can be with the A/D of servo controller Control on Communication
Capture card and the D/A transition card of control input.
Ultrasonic emitting/reception measurement apparatus is by ultrasonic emitting probe transmission cable and ultrasonic
Ripple accepts probe transmission cable and connects with ultrasonic emitting probe and acceptance probe respectively, collects
Data by usb data connection send to host computer carry out process calculate, host computer pair
The process gathering signal is realized by Qt creator programming software, above-mentioned measuring method
By Qt creator programming modeling, its result of calculation just can be shown above at host computer display.
Compared with prior art, the present invention has the advantages that.
It is accurate that this determinator can measure precise displacement that ultrasound probe moves, ultrasound wave
The velocity of sound, ultrasonic acoustic coefficient；Can measure in the surface of polymer thin slab products of optional position
Stress distribution.
Accompanying drawing explanation
Fig. 1 is calculus of finite differences measuring principle schematic diagram.
Fig. 2 .1 is polymer plane thin sheet surface internal stress measuring device front view.
Fig. 2 .2 is polymer plane thin sheet surface internal stress measuring device top view.
Fig. 3 is polymer plane thin sheet surface internal stress measuring device control principle drawing.
Fig. 4 is for controlling process flow diagram flow chart.
In figure: 1, ultrasonic emitting probe；2, ultrasonic emitting probe transmission cable；3、
Ultrasound wave accepts probe；4, ultrasound wave accepts probe transmission cable；5, ball screw；6、
Servomotor；7, tested thin plate sample；8, M8 connecting bolt；9, rectangular support frame；
10, chute limit；11, M4 connecting bolt；12, pretension bolt；13, rear bearing sheet；
14, probe fixture block；15, chute screw；16, chute base plate；17, fixing screw；
18, horizontal shore；19, connection sliding block；20, I-shaped support frame；21, base；22、
Slide block；23, M8 screw；24, A/D communication cable；25, D/A communication cable；26、
D/A card；27, A/D card；28, host computer main frame；29, usb data connection；30、
Host computer display；31, ultrasound wave acceptance/discharger；32, Electric Appliance Cabinet；33, power supply
Display lamp；34, scram button；35, servomotor start button；36,24V Switching Power Supply；
37, servo controller.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As Figure 1-4, the determinator of a kind of polymer plane sheet products surface internal stress
And implementation, wherein, a kind of polymer plane sheet products surface planted agent of the present invention
The determinator of power includes that machinery, servo drive, ultrasonic emitting/reception is measured
Device.
Specifically, machinery includes that base (21), I-shaped support frame (20), rectangle prop up
Support (9), rear bearing sheet (13), quiet slide way mechanism, dynamic slide way mechanism and ball screw chute machine
Structure；I-shaped support frame (20) is fixed on base (21) by the connecting bolt (8) of M8, quiet
Slide way mechanism is connected by connecting bolt (11) and the I-shaped support frame of four M4；Quiet chute
Mechanism includes base plate (16), two chute limits (10), slide block (22) and chute guider screw (15)；
In quiet slide way mechanism, controlled the movement of slide block (22) by rotary chute guider screw (15),
Two chute limits (10) and base plate (16) are to be linked together by the connecting bolt of four M4, sliding
Block (22) is connected with rectangular probe fixture block (14) by pretension bolt (12), probe fixture block (14)
End be clamped with ultrasound wave accept probe (3), by control pretension bolt (12) just can realize
The clamping of ultrasound probe.
Rectangular support frame (9) is fixed on base (21) by the connecting bolt (8) of four M8,
Rectangular support frame (9) is by the connecting bolt (11) of four M4 with ball screw slide way mechanism even
Connect；Ball screw slide way mechanism includes base plate (16), two chute limits (10), connection sliding blocks (19)
With ball screw (5)；Two chute limits (10) and base plate (16) are by the company of four M4
Connecting bolt (11) links together, connection sliding block (22) be embedded in two chute limits (10) and
In the chute that base plate (16) forms, ball screw (5) is by the screw thread on base plate (16)
Hole and connection sliding block (22) connect, and swing roller screw mandrel (5) can drive connection sliding block (19)
Transverse shifting, connection sliding block (19) passes through a M4 connecting bolt (11) and dynamic chute machine
Structure connects.Dynamic slide way mechanism includes base plate (16), two chute limits (10), slide blocks (22)
With chute guider screw (15), slide block (22) is clamped with ultrasonic by probe fixture block (14)
Ripple transmitting probe (1), just can drive ultrasound wave to accept spy by swing roller screw mandrel (5)
Head (3) transverse shifting.
Rear bearing sheet (13) is fixed on base (21) by two M8 screws (23),
Rear bearing sheet (13) both sides indicate graduation mark respectively.Rear bearing sheet (13) is embedded in horizontal support
In frame (18), horizontal shore (18) can be fixed rear bearing sheet (13) with holding screw (17)
On any position, horizontal shore (18) is marked with graduation mark, thin plate sample (7) to be measured
It is placed on horizontal shore (18).
Servo drive is grouped into by servomotor (6) and electric control part, and electric control part is divided and included
Electric Appliance Cabinet (32), servo controller (37), 24V Switching Power Supply (36), power supply indicator
(33), scram button (34), servomotor start button (35), servo controller passes through A/D
Communication cable (24), D/A communication cable (25) realize the mutual of information with host computer (28)
Changing, host computer (28) is provided with can be with the A/D capture card of servo controller (37) Control on Communication
(27) and control input D/A transition card (26), concrete control flow is as shown in Figure 4.
Ultrasonic emitting/reception measurement apparatus by ultrasonic emitting probe transmission cable (2) and
Ultrasound wave accepts probe transmission cable (4) and pops one's head in (1) with ultrasonic emitting respectively and accept spy
Head (3) connects, and the data collected send to upper by usb data connection (29)
Machine (28) carries out processing calculating, and host computer is by Qt creator to the process of collection signal
Programming software realizes, and above-mentioned measuring method by Qt creator programming modeling, it calculates
Result just can be shown above at host computer display (30).
Apply above-mentioned polymer thin Stress of plate interior determinator, implementation of the present invention,
Including following measuring process:
1) under the conditions of same process, it is molded some Merlon thin plate laboratory samples, this sample
Product thickness 2mm, wide 89mm, high 100mm.Then take wherein three pieces of laboratory samples and be placed on baking
Individual hour of insulation annealing 2-3 in case.
2) with the ultrasonic velocity V of sample after the measurement annealing of above-mentioned internal stress determinator0。
3) the ultrasonic velocity V of unannealed experiment sample is measured with above-mentioned internal stress determinator.
4) δ size is obtained according to formula 1, it is possible to characterize sample in a certain position
The size of stress and the form of expression.
Embodiment
One, with the ultrasound wave of sample after the measurement annealing of above-mentioned polymer sheet internal stress determinator
Velocity of wave V0
1) choose annealing effect reasonable Merlon thin plate laboratory sample and be placed on horizontal support
On frame, treat that host computer initializes, adjust tested thin plate laboratory sample to suitably measuring position,
Then rotary chute screw makes two probes and sample be fully contacted until on ultrasonic measuring device
Have and well gather signal.
2) clicking on the ultrasonic signal above host computer and gather button, ultrasonic measuring device is just
Collect initial flight time t0, for the accuracy sampled, continuous sampling three times, it is averaged
Value, result is as shown in table 1.Measurement result is sent to host computer by usb data connection
Middle preservation.
The flight time t that after table 1 annealing, sample collects at initial position0/us
| Sampling for the first time | Second time sampling | Third time sampling | Meansigma methods | |
| t0/us | 19.33030 | 19.30984 | 19.35926 | 19.33312 |
3) electrical equipment control servomotor start button cashier's office in a shop is pressed, defeated in host computer the most again
Entering distance, delta d to be measured is 2mm, and at this moment host computer is calculated by formula 4 needs to rotate
The number of turns after send instructions to servo controller, servo controller accurately control servomotor
Realize accepting the lateral distance of probe.After servomotor stops operating, again tap on
Ultrasonic signal above the machine of position gathers button, and ultrasonic measuring device just collects flight time
t1, continuous sampling three times, then average, measurement result is as shown in table 2.
The flight time that after table 2 annealing, sample collects after accepting the mobile 1mm of probe
t1/us
| Sampling for the first time | Second time sampling | Third time sampling | Meansigma methods | |
| t1/us | 20.06243 | 20.10959 | 20.01705 | 20.063025 |
4) the flight time value by collecting for twice makees the available Δ t of difference；
Δ t=t1-t0=20.06302-19.33312=0.7299 μ s
5) the ultrasonic velocity V0=Δ d/ Δ t=2740.1013m/s of sample after annealing
In order to improve certainty of measurement, can repeatedly move the distance accepting probe, ask institute the most again
There is the meansigma methods of ultrasonic velocity in measuring section.After annealing, the ultrasonic velocity value of sample is last
It is saved in host computer.
Two, a certain position of unannealed sample is measured with above-mentioned polymer sheet internal stress determinator
The ultrasonic velocity V at place1
1) Merlon thin plate laboratory sample is placed on horizontal shore, treats that host computer is initial
Changing, adjust tested thin plate laboratory sample to suitably measuring position, then rotary chute screw makes
Two probes are fully contacted with sample until having on ultrasonic measuring device and well gathering signal.
2) clicking on the ultrasonic signal above host computer and gather button, ultrasonic measuring device is just
Collect initial flight time t0, for the accuracy sampled, continuous sampling three times, it is averaged
Value, result is as shown in table 3.Measurement result is sent to host computer by usb data connection
Middle preservation.
The flight time t that table 3 sample collects at initial position0/us
| Sampling for the first time | Second time sampling | Third time sampling | Meansigma methods | |
| t0/us | 19.32331 | 19.31404 | 19.30512 | 19.314156 |
3) electrical equipment control servomotor start button cashier's office in a shop is pressed, defeated in host computer the most again
Entering distance, delta d to be measured is 1mm, and at this moment host computer is calculated by formula 3 needs to rotate
The number of turns after send instructions to servo controller, servo controller accurately control servomotor
Realize accepting the lateral distance of probe.After servomotor stops operating, again tap on
Ultrasonic signal above the machine of position gathers button, and ultrasonic measuring device just collects flight time
t1, continuous sampling three times, then average, measurement result is as shown in table 4.
The flight time t that table 4 collects after accepting the mobile 1mm of probe1/us
| Sampling for the first time | Second time sampling | Third time sampling | Meansigma methods | |
| t1/us | 19.64243 | 19.65959 | 19.63705 | 19.650681 |
4) the flight time value by collecting for twice makees the available Δ t of difference；
Δ t=t1-t0=19.650681-19.314156=0.3364us
5) ultrasonic velocity of sample a certain measurement position
V=Δ d/ Δ t=2972.651m/s
Three, characterize formula 2 according to poly-carbonic acid sheet products surface internal stress can draw:
δ > 0 is understood, so measuring position along measuring in direction at thin plate by measurement result
Stress shows as compressive stress, and the relative size characterized with δ is 0.011.It addition, laterally
With vertically move tested thin plate sample and just can measure the δ-value of various location, thus the most permissible
Know scattergram and the form of expression of the internal stress relative size of whole tested thin plate sample.
The present invention and traditional internal stress method of testing have a following obvious advantage:
1) owing to using the high-precision driving such as ball screw, servomotor in patent of the present invention
The measurement of mechanism and automatization controls, it is to avoid the error that artificial measurement brings, and measures accurately
Du Genggao, and the internal stress of sample various location can be carried out the survey in slight distance
Amount.
2) measurement result can quickly show in host computer.
3) complexity based on product surface internal stress, the method using δ to characterize makes measurement process
Simpler, quick, it is to avoid the complicated calculations of sonoelastic coefficient.
Claims (1)
1. a determinator for polymer plane sheet products surface internal stress, its feature exists
In: this device includes that dress is measured in machinery, servo drive, ultrasonic emitting/reception
Put；
Specifically, machinery includes that base (21), I-shaped support frame (20), rectangle prop up
Support (9), rear bearing sheet (13), quiet slide way mechanism, dynamic slide way mechanism and ball screw chute machine
Structure；I-shaped support frame (20) is fixed on base (21) by the connecting bolt (8) of M8, quiet
Slide way mechanism is connected by connecting bolt (11) and the I-shaped support frame of four M4；Quiet chute
Mechanism includes base plate (16), two chute limits (10), slide block (22) and chute guider screw (15)；
In quiet slide way mechanism, controlled the movement of slide block (22) by rotary chute guider screw (15),
Two chute limits (10) and base plate (16) are to be linked together by the connecting bolt of four M4, sliding
Block (22) is connected with rectangular probe fixture block (14) by pretension bolt (12), probe fixture block (14)
End be clamped with ultrasound wave accept probe (3), by control pretension bolt (12) can be realized as
The clamping of ultrasound probe；
Rectangular support frame (9) is fixed on base (21) by the connecting bolt (8) of four M8,
Rectangular support frame (9) is by the connecting bolt (11) of four M4 with ball screw slide way mechanism even
Connect；Ball screw slide way mechanism includes base plate (16), two chute limits (10), connection sliding blocks (19)
With ball screw (5)；Two chute limits (10) and base plate (16) are by the company of four M4
Connecting bolt (11) links together, connection sliding block (22) be embedded in two chute limits (10) and
In the chute that base plate (16) forms, ball screw (5) is by the screw thread on base plate (16)
Hole and connection sliding block (22) connect, and swing roller screw mandrel (5) can drive connection sliding block (19)
Transverse shifting, connection sliding block (19) passes through a M4 connecting bolt (11) and dynamic chute machine
Structure connects；Dynamic slide way mechanism includes base plate (16), two chute limits (10), slide blocks (22)
With chute guider screw (15), slide block (22) is clamped with ultrasonic by probe fixture block (14)
Ripple transmitting probe (1), just can drive ultrasound wave to accept spy by swing roller screw mandrel (5)
Head (3) transverse shifting；
Rear bearing sheet (13) is fixed on base (21) by two M8 screws (23),
Rear bearing sheet (13) both sides indicate graduation mark respectively；Rear bearing sheet (13) is embedded in horizontal support
In frame (18), horizontal shore (18) can be fixed rear bearing sheet (13) with holding screw (17)
On any position, horizontal shore (18) is marked with graduation mark, thin plate sample (7) to be measured
It is placed on horizontal shore (18)；
Servo drive is grouped into by servomotor (6) and electric control part, and electric control part is divided and included
Electric Appliance Cabinet (32), servo controller (37), 24V Switching Power Supply (36), power supply indicator
(33), scram button (34), servomotor start button (35), servo controller passes through A/D
Communication cable (24), D/A communication cable (25) realize the mutual of information with host computer (28)
Changing, host computer (28) is provided with can be with the A/D capture card of servo controller (37) Control on Communication
(27) and control input D/A transition card (26)；
Ultrasonic emitting/reception measurement apparatus by ultrasonic emitting probe transmission cable (2) and
Ultrasound wave accepts probe transmission cable (4) and pops one's head in (1) with ultrasonic emitting respectively and accept spy
Head (3) connects, and the data collected send to upper by usb data connection (29)
Machine (28) carries out processing calculating, and host computer is by Qt creator to the process of collection signal
Programming software realizes, and above-mentioned measuring method by Qt creator programming modeling, it calculates
Result is just shown above at host computer display (30)；
The implementation process of this device is as follows,
1) under the conditions of same process, it is molded some Merlon thin plate laboratory samples, this sample
Product thickness 2mm, wide 89mm, high 100mm；Then take wherein three pieces of laboratory samples and be placed on baking
Individual hour of insulation annealing 2-3 in case；
2) with the ultrasonic velocity V of sample after the measurement annealing of above-mentioned internal stress determinator0；
3) the ultrasonic velocity V of unannealed experiment sample is measured with above-mentioned internal stress determinator；
4) according to formula
Wherein, V-penetrates the velocity of wave of the ultrasound wave actual measurement of polymer thin slab products, m.s-1；V0-
The velocity of wave of ultrasound wave, m.s during polymer thin slab products internal stress free state-1；σ-medium internal stress,
MPa；K-sonoelastic coefficient, m2.N-1Obtain δ size；Just can characterize sample at certain
The size of one position internal stress and the form of expression.
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| CN112730614A (en) * | 2020-12-22 | 2021-04-30 | 中冶建筑研究总院有限公司 | Surface ultrasonic device and method for detecting prestress value |
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| CN102175769A (en) * | 2010-12-13 | 2011-09-07 | 北京林业大学 | Nondestructive detection method for mechanical properties of larch component material of historic building |
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| WO1986005272A1 (en) * | 1985-02-27 | 1986-09-12 | Hitachi Construction Machinery Co., Ltd | Method of measuring stress in plate material with ultrasonic waves |
| JP3608423B2 (en) * | 1999-03-19 | 2005-01-12 | Ｊｆｅスチール株式会社 | Electromagnetic ultrasonic measurement method and apparatus |
| JP3581931B2 (en) * | 2002-03-28 | 2004-10-27 | 捷宏 川島 | Electromagnetic ultrasonic inspection method using cross-correlation method |
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| CN102175769A (en) * | 2010-12-13 | 2011-09-07 | 北京林业大学 | Nondestructive detection method for mechanical properties of larch component material of historic building |
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| Title |
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| 数字化超声波探头性能检测系统研究;张鹏飞 等;《机械设计与制造》;20140331(第3期);第152页第3节、图2 * |
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