CN105158338A - Sound velocity on-site measurement method of smooth surface material - Google Patents
Sound velocity on-site measurement method of smooth surface material Download PDFInfo
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- CN105158338A CN105158338A CN201510403787.0A CN201510403787A CN105158338A CN 105158338 A CN105158338 A CN 105158338A CN 201510403787 A CN201510403787 A CN 201510403787A CN 105158338 A CN105158338 A CN 105158338A
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Abstract
The present invention relates to a sound velocity on-site measurement method of a smooth surface material. The sound velocity on-site measurement method comprises: (1) selecting measurement equipment; (2) adjusting a universal digital ultrasonic flaw detector, and eliminating the propagation influence of the probe inner surface wave; and (3) adjusting two surface wave probes so as to make the two surface wave probes be in a straight line and make the distance between the two surface wave probes be L, and adjusting the ultrasonic wave sound velocity value input by the ultrasonic flaw detector so as to make the sound path be displayed as L, wherein the input sound velocity is the sound velocity of the surface wave in a measured work-piece; and (4) according to a surface wave sound velocity propagation velocity formula, calculating to obtain the ultrasonic longitudinal wave sound velocity and the ultrasonic transverse wave sound velocity of the work-piece. According to the present invention, the ordinary digital ultrasonic flaw detector is used, the method for on-site measurement of the smooth surface material sound velocity through the surface wave method is used, and the test and on-site application results show that the material sound velocity can be accurately measured through the method of the present invention.
Description
Technical field
The invention belongs to electric system technical field of nondestructive testing, particularly a kind of velocity of sound on-site measurement method of smooth surface materials.
Background technology
The material sonic velocity measurement method that current national and foreign standards specifies all adopts cutting sampling from measured workpiece, after accurately measuring sample thickness T and ultrasound wave travel-time t in the sample, according to relational expression V=T/t, calculates velocity of sound v.The prerequisite adopting the method to carry out material sonic velocity measurement can adopt the thickness of mechanical means Measurement accuracy workpiece or extract sample from it, but when at the scene the workpiece material velocity of sound being measured, often do not allow to carry out destructiveness sampling to workpiece, and mechanical means can not be adopted to record workpiece due to reasons such as Workpiece structures, therefore cannot adopt above-mentioned conventional method measuring workpieces acoustic velocity of material.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, and propose a kind of velocity of sound on-site measurement method of smooth surface materials.
The present invention solves its technical matters and takes following technical scheme to realize:
A velocity of sound on-site measurement method for smooth surface materials, comprises step as follows:
(1) the choosing of measuring equipment, equipment comprises the surface wave probe of general digital formula ultra-sonic defect detector and two identical parameters, and two surface wave probes are connected with general digital formula ultra-sonic defect detector respectively;
(2) adjust general digital formula ultra-sonic defect detector, eliminate probe inside surface wave propagation impact;
1. first by the surface wave probe of two identical parameters smooth measured workpiece on the surface arranged opposite place, two surface wave probe spacing are 0, meanwhile, keep acoustic beam on the same axis;
2. adjust ultra-sonic defect detector indication range and decay after, screen demonstrates surface wave echo, adjust ultra-sonic defect detector gate again, entangle this echo, the sound path of now ultra-sonic defect detector display is the distance between two Probe index, the time delay of adjustment ultra-sonic defect detector, makes this sound path be shown as 0, namely eliminates surface wave probe inside surface wave propagation impact;
(3) adjust two surface wave probes, make it point-blank and between distance be L, adjustment ultra-sonic defect detector input ultrasonic velocity value, make this sound path be shown as L, the velocity of sound now inputted is the velocity of sound of surface wave in measured workpiece;
(4) according to the ultrasonic longitudinal wave velocity of sound C in solid material
l, transverse wave velocity C
s, surface wave velocity of sound C
rvelocity of propagation relation formula:
In formula: σ is medium Poisson ratio, records C
rafter, calculate workpiece ultrasonic longitudinal wave and transverse wave velocity by above formula.
And in the 1. step of described step (2), smooth measured workpiece surface is: except the smooth surface of descale after machine work.
Advantage of the present invention and good effect are:
The present invention proposes a kind of without the need to destroying workpiece and without the need to adopting on the basis of mechanical means measuring workpieces wall thickness, utilize ordinary numbers formula ultra-sonic defect detector, adopt the method for surface wave method in-site measurement smooth surface acoustic velocity of material, show through test and rig-site utilization, it more adequately can measure acoustic velocity of material.
Embodiment
Below the embodiment of the present invention is further described: it is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention is not limited to the embodiment described in embodiment; every other embodiment drawn by those skilled in the art's technical scheme according to the present invention, belongs to the scope of protection of the invention equally.
A velocity of sound on-site measurement method for smooth surface materials, it is as follows that the method comprising the steps of:
(1) the choosing of experimental facilities, equipment comprises: the surface wave probe of general digital formula ultra-sonic defect detector and two identical parameters, and two surface wave probes are connected with general digital formula ultra-sonic defect detector respectively;
(2) adjust general digital formula ultra-sonic defect detector, eliminate probe inside surface wave propagation impact;
1. first by the surface wave probe of two identical parameters smooth measured workpiece on the surface arranged opposite place, two surface wave probe spacing are 0, meanwhile, keep acoustic beam on the same axis;
2. adjust ultra-sonic defect detector indication range and decay after, screen demonstrates surface wave echo, adjust ultra-sonic defect detector gate again, entangle this echo, the sound path of now ultra-sonic defect detector display is the distance between two Probe index, the time delay of adjustment ultra-sonic defect detector, makes this sound path be shown as 0, can eliminate probe inside surface wave propagation impact;
(3) adjust two surface wave probes, make it point-blank and between distance be L, adjustment ultra-sonic defect detector input ultrasonic velocity value, make this sound path be shown as L, the velocity of sound now inputted is the velocity of sound of surface wave in measured workpiece;
(4) according to the ultrasonic longitudinal wave velocity of sound C in solid material
l, transverse wave velocity C
s, surface wave velocity of sound C
rvelocity of propagation relation formula:
In formula: σ is medium Poisson ratio, records C
rafter can calculate workpiece ultrasonic longitudinal wave and transverse wave velocity by above formula.
In specific embodiment of the invention, in the 1. step of described step (2), smooth measured workpiece surface is: except the smooth surface of descale after machine work.
Test shows, adopts the method more adequately can measure material surface wave sound speed, but needs surface of the work smooth.The more coarse sample of oxide skin or surface is had for surface, the surface wave speed recorded is significantly less than the surface wave speed through mach smooth surface sample, to be that specimen surface is coarse add surperficial wave propagation distance to its reason, extend the travel-time, thus make the velocity of sound of the surface wave calculated on the low side.
Claims (2)
1. a velocity of sound on-site measurement method for smooth surface materials, is characterized in that comprising step as follows:
(1) the choosing of measuring equipment, equipment comprises the surface wave probe of general digital formula ultra-sonic defect detector and two identical parameters, and two surface wave probes are connected with general digital formula ultra-sonic defect detector respectively;
(2) adjust general digital formula ultra-sonic defect detector, eliminate probe inside surface wave propagation impact;
1. first by the surface wave probe of two identical parameters smooth measured workpiece on the surface arranged opposite place, two surface wave probe spacing are 0, meanwhile, keep acoustic beam on the same axis;
2. adjust ultra-sonic defect detector indication range and decay after, screen demonstrates surface wave echo, adjust ultra-sonic defect detector gate again, entangle this echo, the sound path of now ultra-sonic defect detector display is the distance between two Probe index, the time delay of adjustment ultra-sonic defect detector, makes this sound path be shown as 0, namely eliminates surface wave probe inside surface wave propagation impact;
(3) adjust two surface wave probes, make it point-blank and between distance be L, adjustment ultra-sonic defect detector input ultrasonic velocity value, make this sound path be shown as L, the velocity of sound now inputted is the velocity of sound of surface wave in measured workpiece;
(4) according to the ultrasonic longitudinal wave velocity of sound C in solid material
l, transverse wave velocity C
s, surface wave velocity of sound C
rvelocity of propagation relation formula:
In formula: σ is medium Poisson ratio, records C
rafter, calculate workpiece ultrasonic longitudinal wave and transverse wave velocity by above formula.
2. the velocity of sound on-site measurement method of smooth surface materials according to claim 1, is characterized in that: in the 1. step of described step (2), smooth measured workpiece surface is: except the smooth surface of descale after machine work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510403787.0A CN105158338A (en) | 2015-07-10 | 2015-07-10 | Sound velocity on-site measurement method of smooth surface material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484836A (en) * | 2020-11-20 | 2021-03-12 | 西安热工研究院有限公司 | Ultrasonic probe device and workpiece sound velocity measurement method |
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| CN102636249A (en) * | 2012-05-09 | 2012-08-15 | 河北省电力研究院 | Method for measuring acoustic velocity of material by using surface wave |
| CN102943461A (en) * | 2012-12-06 | 2013-02-27 | 天津市市政工程设计研究院 | Quantitative analysis method for evaluating dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves |
| CN104730147A (en) * | 2015-03-31 | 2015-06-24 | 无锡市崇安区科技创业服务中心 | Ultrasonic-based lithosphere state real-time monitoring system |
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Patent Citations (5)
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| CN1521503A (en) * | 2003-01-28 | 2004-08-18 | 上海市计{技术研究所 | Full digital phased array ultrasonic non-destructive detection system and method |
| CN101266228A (en) * | 2008-03-10 | 2008-09-17 | 河北省电力研究院 | Material sonic velocity measurement method |
| CN102636249A (en) * | 2012-05-09 | 2012-08-15 | 河北省电力研究院 | Method for measuring acoustic velocity of material by using surface wave |
| CN102943461A (en) * | 2012-12-06 | 2013-02-27 | 天津市市政工程设计研究院 | Quantitative analysis method for evaluating dynamic compaction reinforcement effect of foundation by utilizing Rayleigh surface waves |
| CN104730147A (en) * | 2015-03-31 | 2015-06-24 | 无锡市崇安区科技创业服务中心 | Ultrasonic-based lithosphere state real-time monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112484836A (en) * | 2020-11-20 | 2021-03-12 | 西安热工研究院有限公司 | Ultrasonic probe device and workpiece sound velocity measurement method |
| CN112484836B (en) * | 2020-11-20 | 2023-04-07 | 西安热工研究院有限公司 | Ultrasonic probe device and workpiece sound velocity measurement method |
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