CN103822599A - Composite material laminated structural member pulse reflection thickness measuring method - Google Patents
Composite material laminated structural member pulse reflection thickness measuring method Download PDFInfo
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- CN103822599A CN103822599A CN201210464137.3A CN201210464137A CN103822599A CN 103822599 A CN103822599 A CN 103822599A CN 201210464137 A CN201210464137 A CN 201210464137A CN 103822599 A CN103822599 A CN 103822599A
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Abstract
The invention belongs to a method for measuring the thickness of a composite material member by use of an ultrasonic pulse reflection method. According to the invention, the thickness of the composite material member is measured by use of the ultrasonic pulse reflection method such that the universality of detection objects, the reliability of detection results and the efficiency are improved, and when the thickness of a part which has a quite complex structure and quite large dimension is measured, the situation that some areas cannot be detected does not occur. Compared to a mechanical thickness measuring method, the method provided by the invention has the following advantages: the obtained thickness measuring values are closer to real values, since the method involves digital detection, the thickness value of a detected position can be directly displayed on an instrument, and there are fewer influences of manual factors.
Description
Technical field
The invention belongs to the method that adopts the principle of ultrasonic pulse reflection method composite material element to be carried out to thickness detection.
Background technology
The application of compound substance in all trades and professions at present more and more extensively got up, our factory is the important base that a composite material element is produced, on a lot of types, all use a large amount of composite material elements, often need to carry out thickness detection to guarantee the Weight control etc. of product for these composite material elements.We carry out when thickness detects adopting mechanical thickness measuring to use slide calliper rule or milscale to carry out thickness measuring to composite material element in the past, but can have a series of shortcoming while using mechanical thickness measuring: 1) be subject to the restriction of design of part and size.In the time that a complicated structure and larger-size composite material element are carried out to mechanical thickness measuring; the thickness that often can run into some complex region (as closed area) can't detect; and using slide calliper rule to detect can only open wide in the scope of area edge 150mm and detect part, and this just makes to detect and is limited by very large.2) use mechanical means to carry out the numerical value that thickness measuring reads and have certain error because some artificial origins can cause these data, thereby affected the judgement of testing result.3) detection rates is also very low, when large part is detected, wants the expensive time.
Summary of the invention
The technical problem to be solved in the present invention:
The present invention uses ultrasonic pulse reflection method to carry out thickness measuring to composite material element, detects the popularity of detected object and the reliability of testing result and efficiency to increase.
Technical scheme of the present invention:
Laminated composite structural member pulse-echo thickness measuring method, this method comprises the following steps:
The first step: determine that detected pieces needs laying, material and the theoretic throat value at the position of thickness measuring, the laying number of plies that theoretic throat value is every kind of material and the sum of products of this materials theory thickness;
Second step: make contrast test piece, contrast test piece should be identical or close with detected pieces material, cure parameter, laying; Should make the contrast test piece of three kinds of layings, its thickness is respectively and is less than or equal to detected pieces minimum thickness, is more than or equal to detected pieces maximum ga(u)ge and detected pieces interior thickness;
The 3rd step: contrast the flawless detection that has of test piece, after contrast specimen preparation, use ultrasound measuring instrument to detect contrast test piece, to guarantee the defect of impact contrast thickness of test piece such as not having layering in contrast test piece, be mingled with, as detect after do not reveal any abnormalities phenomenon, so this test piece be considered as qualified;
The 4th step: to contrast test piece carry out three-dimensional thickness measuring, in the contrast test piece that does not have defect mark want well detection side to and carry out thickness measuring, when thickness measuring, measure every 1 of 10mm, and record measurement result.It is qualified point that the variation in thickness of measurement point is no more than this kind of contrast test piece theoretic throat ± 6%;
The 5th step: choose calibration point, choose all qualified points of Ultrasonic Detection and thickness measuring result, the row labels of going forward side by side in test piece in contrast;
The 6th step: on the calibration point having marked in the contrast test piece of thickness minimum and the contrast test piece of thickness maximum, use audiogage to enter calibration to these two points, calibrate the complete velocity of sound that can obtain contrast test piece material therefor afterwards, under this velocity of sound, be to carry out thickness detection on the calibration point of contrast test piece of detected pieces intermediate value to thickness, if testing result is more or less the same in 0.1mm with the thickness results detecting by three-dimensional, prove that this velocity of sound is correct, thereby determined the velocity of sound of tested material;
The 7th step: according to the velocity of sound of tested material, detected pieces is carried out to thickness measuring.
Beneficial effect of the present invention:
In the time that complicated structure, part that size is larger are carried out to thickness measuring, the situation that just there will not be some region to detect.The thickness measuring numerical value obtaining of comparing with the mechanical thickness measuring method of use more approaches real numerical value, because the method is digitized detection, can on instrument, directly demonstrate the one-tenth-value thickness 1/10 at tested position, and the factor of man's activity is fewer.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Describe as an example of the laminated composite structural member of certain type machine example below.
The first step: the laying that will need thickness measuring position, material and the theoretic throat value of determining detected pieces, theoretic throat value is that (position as to be detected in certain is the position 1 in table 1 for the laying number of plies of every kind of material and the sum of products of this materials theory thickness, the laying at this position is 1G13C24C1, the meaning of its expression is made up of 1 layer of G1 material, 3 layers of C2 material and 4 layers of C1 material for this position, and the theoretic throat value at position 1 is 1 × 0.241+3 × 0.218+4 × 0.104=1.31mm so).The information such as our the known laying that need to carry out all sites of the detected pieces of thickness detection are as table 1;
Table 1
Second step: make contrast test piece, contrast test piece should be identical or close with detected pieces material, cure parameter, laying; Should make the contrast test piece of three kinds of layings, its thickness is respectively and is less than or equal to detected pieces minimum thickness, is more than or equal to detected pieces maximum ga(u)ge and detected pieces interior thickness.Be applicable to the contrast test piece of detected pieces of all laying kinds in table 1 in table 2.
Table 2
| Test piece number | Laying | Theoretic throat (mm) | The tolerance (mm) allowing |
| 1-1 | 1G1 3C2 2C1 | 1.103 | 1.037-1.169 |
| 2-1 | 1G1 9C2 6C1 | 2.827 | 2.657-2.997 |
| 3-1 | 1G1 12C2 12C1 | 4.11 | 3.863-4.357 |
The 3rd step: contrast the flawless detection that has of test piece, after contrast specimen preparation, use ultrasound measuring instrument to detect contrast test piece, to guarantee the defect of impact contrast thickness of test piece such as not having layering in contrast test piece, be mingled with, as detect after do not reveal any abnormalities phenomenon, so this test piece be considered as qualified;
The 4th step: to contrast test piece carry out thickness measuring, in the contrast test piece that does not have defect mark want well detection side to and carry out thickness measuring, when thickness measuring, measure every 1 of 10mm, and record measurement result.It is qualified point that the variation in thickness of measurement point is no more than this kind of contrast test piece theoretic throat ± 6%; As the thickness measuring result of 100 points for contrast test piece 1-1 that represent in table 3, in this table, all points that meet the thickness deviation that contrasts test piece 1-1 in table 2 are qualified point, and all the other two contrast test pieces in like manner;
Table 3
| 0.987 | 0.998 | 1.002 | 1.057 | 1.101 | 1.115 | 1.125 | 1.082 | 1.026 | 0.987 |
| 0.980 | 1.011 | 1.025 | 1.036 | 1.112 | 1.158 | 1.167 | 1.142 | 1.089 | 1.052 |
| 1.021 | 1.069 | 1.110 | 1.135 | 1.156 | 1.175 | 1.168 | 1.138 | 1.095 | 1.068 |
| 0.996 | 1.035 | 1.086 | 1.145 | 1.198 | 1.186 | 1.173 | 1.154 | 1.088 | 1.032 |
| 1.012 | 1.068 | 1.079 | 1.186 | 1.203 | 1.285 | 1.178 | 1.153 | 1.092 | 1.025 |
| 1.026 | 1.077 | 1.096 | 1.153 | 1.199 | 1.361 | 1.266 | 1.176 | 1.086 | 1.011 |
| 1.029 | 1.088 | 1.092 | 1.126 | 1.168 | 1.206 | 1.254 | 1.165 | 1.115 | 1.096 |
| 0.996 | 1.036 | 1.069 | 1.087 | 1.124 | 1.168 | 1.201 | 1.136 | 1.103 | 0.999 |
| 0.968 | 1.012 | 1.049 | 1.096 | 1.146 | 1.166 | 1.162 | 1.154 | 1.089 | 1.021 |
| 1.003 | 1.065 | 1.099 | 1.136 | 1.169 | 1.178 | 1.166 | 1.092 | 1.032 | 0.976 |
The 5th step: choose calibration point, choose all qualified points of Ultrasonic Detection and thickness measuring result, the row labels of going forward side by side in test piece in contrast; In table 3, choose point that thickness is qualified as calibration point, be marked with white identification pencil, and indicate the actual measurement one-tenth-value thickness 1/10 of this point, the choosing in like manner of the calibration point of all the other two contrast test pieces;
The 6th step: on the calibration point having marked in the contrast test piece (contrast test piece 1-1) of thickness minimum and the contrast test piece (contrast test piece 3-1) of thickness maximum, use audiogage to enter calibration to these two points, calibrating the complete velocity of sound that obtains afterwards making contrast test piece material therefor is 3031m/s, under this velocity of sound, be to carry out thickness detection on the calibration point of contrast test piece (contrast test piece 2-1) of detected pieces intermediate value to thickness, if testing result is more or less the same in 0.1mm with the thickness results detecting by three-dimensional, prove that this velocity of sound is correct, thereby determine the velocity of sound of tested material,
The 7th step: according to the velocity of sound of tested material, detected pieces is carried out to thickness measuring.
Claims (1)
1. laminated composite structural member pulse-echo thickness measuring method, is characterized in that, this method comprises the following steps:
The first step: determine that detected pieces needs laying, material and the theoretic throat value at the position of thickness measuring, theoretic throat value is the product of the laying number of plies and materials theory thickness;
Second step: make contrast test piece, contrast test piece should be identical or close with detected pieces material, cure parameter, laying; Should make the contrast test piece of three kinds of layings, its thickness is respectively and is less than or equal to detected pieces minimum thickness, is more than or equal to detected pieces maximum ga(u)ge and detected pieces interior thickness, and the contrast test piece of above three kinds of layings is each makes three;
The 3rd step: ultrasonic attenuation test, after contrast specimen preparation, use ultrasound measuring instrument to carry out attenuation test to contrast test piece, should not the exceed ± 2dB of pad value variation range of different test points in every contrast test piece chooses satisfactory test piece in three contrast test pieces of identical laying;
The 4th step: contrast test piece is carried out to thickness measuring, in the contrast test piece that meets ultrasonic attenuation test mark want well detection side to and carry out thickness measuring, when thickness measuring, measure every 1 of 8-12mm, and record measurement result, all measurement point variation in thickness be no more than this kind of contrast test piece theoretic throat ± 6% for qualified;
The 5th step: choose calibration point, choose all qualified points of thickness measuring result and ultrasonic attenuation, the row labels of going forward side by side in test piece in contrast;
The 6th step: use audiogage to detect the velocity of sound of contrast test piece, thereby determined the velocity of sound of tested material;
The 7th step: according to the velocity of sound of tested material, detected pieces is carried out to thickness measuring.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106643592A (en) * | 2016-12-14 | 2017-05-10 | 西安交通大学 | Method and apparatus for measuring thickness of intermediate layer of three-layer composite plate |
| CN107525481A (en) * | 2017-08-18 | 2017-12-29 | 中国航发贵州黎阳航空动力有限公司 | A kind of plug welding point ultrasonic detection device and method |
| CN108458676A (en) * | 2018-03-29 | 2018-08-28 | 深圳市贝优通新能源技术开发有限公司 | A kind of sonigauge with mark function suitable for small pipeline |
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| JPH07128043A (en) * | 1993-10-29 | 1995-05-19 | Chichibu Onoda Cement Corp | Abrasion measuring terminal and measuring method for composite material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643592A (en) * | 2016-12-14 | 2017-05-10 | 西安交通大学 | Method and apparatus for measuring thickness of intermediate layer of three-layer composite plate |
| CN106643592B (en) * | 2016-12-14 | 2019-06-11 | 西安交通大学 | It is a kind of for measuring the method and apparatus of three-layer composite board intermediate layer thickness |
| CN107525481A (en) * | 2017-08-18 | 2017-12-29 | 中国航发贵州黎阳航空动力有限公司 | A kind of plug welding point ultrasonic detection device and method |
| CN107525481B (en) * | 2017-08-18 | 2020-03-13 | 中国航发贵州黎阳航空动力有限公司 | Ultrasonic detection device and method for plug welding point |
| CN108458676A (en) * | 2018-03-29 | 2018-08-28 | 深圳市贝优通新能源技术开发有限公司 | A kind of sonigauge with mark function suitable for small pipeline |
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