CN104198583B - The ultrasonic echo measuring method of end sandwich component debonding defect detection altogether - Google Patents
The ultrasonic echo measuring method of end sandwich component debonding defect detection altogether Download PDFInfo
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- CN104198583B CN104198583B CN201410455817.8A CN201410455817A CN104198583B CN 104198583 B CN104198583 B CN 104198583B CN 201410455817 A CN201410455817 A CN 201410455817A CN 104198583 B CN104198583 B CN 104198583B
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Abstract
The present invention relates to ultrasonic echo measuring method and the measurement apparatus of a kind of end sandwich component debonding defect altogether detection, described measuring method comprises the following steps: 1) utilize probe that by set path, exemplary position is carried out repeated ultrasonic Scanning Detction, setting up effective echo number of dissimilar debonding defect and probe and the data base of debonding defect frontier distance relation, described exemplary position includes without debonding defect position, metallic plate and glue-line debonding defect position and glue-line and foam debonding defect position；2) metal sheet surface to end sandwich component altogether to be measured carries out overall ultrasonic scanning detection, the effective echo number obtained according to detection and the comparing result of described data base, determines debonding defect type and border；Described measurement apparatus includes data acquisition unit, supersonic generator and the ultrasound probe being sequentially connected with.Compared with prior art, the present invention has the advantages such as lossless, the most effective.
Description
Technical field
The present invention relates to a kind of Dynamic Non-Destruction Measurement, especially relate to ultrasonic echo measuring method and the device of the detection of a kind of end sandwich component debonding defect altogether.
Background technology
Large-scale altogether end sandwich component is the critical component of a new generation's carrier rocket fuel tank, its with PMI foam core and aluminium alloy upper and lower panel, adhesive solidification form, be used for isolating kerosene, liquid oxygen fuel.In actual manufacture process, due to complexity and the restriction of working condition of structure, easily cause the debonding defect of sandwich component of the common end.The debonding defect of foam layer altogether primer junction structure includes between metallic plate and glue-line unsticking two kinds between unsticking and glue-line and foam.In order to maintain rocket body stability to guarantee successful launch, it is desirable to end sandwich component has the highest gluing quality altogether, specifically need to meet techniques below index: after sandwich bonds with upper and lower panel, often place's unsticking area is less than 625mm2, the unsticking gross area is not more than 5% that panel surface is long-pending.Reducing debonding defect area is the major issue improving end sandwich component intensity altogether, it is necessary first to accurately detect debonding defect.Existing debonding defect detection method there is also the deficiency that precision is inadequate.
Ultrasound examination is a kind of lossless detection method, it is not necessary to detection position is carried out destructive testing.Energy variation when it utilizes the acoustical behavior difference of material and defect thereof to ultrasound wave wave reflections situation and penetrates carrys out experimental material internal flaw, there is feature easily operated, quick, reliable, highly sensitive, that degree of accuracy is high and portable, can accurately determine kind and the position distribution of defect, be widely used.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of lossless, be total to ultrasonic echo measuring method and the device of the detection of end sandwich component debonding defect fast and effectively.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of ultrasonic echo measuring method of end sandwich component debonding defect altogether detection, described sandwich component of the common end includes double layer of metal plate, the foam being located between double layer of metal plate and the glue-line being located between metallic plate and foam, it is characterized in that, described measuring method comprises the following steps:
1) utilize probe that by set path, exemplary position is carried out repeated ultrasonic Scanning Detction, setting up effective echo number of dissimilar debonding defect and probe and the data base of debonding defect frontier distance relation, described exemplary position includes without debonding defect position, metallic plate and glue-line debonding defect position and glue-line and foam debonding defect position；
2) metal sheet surface to end sandwich component altogether to be measured carries out overall ultrasonic scanning detection, the effective echo number obtained according to detection and the comparing result of described data base, determines debonding defect type and border.
Before carrying out ultrasonic scanning detection, couplant is applied to sandwich component surface, the common end.
Described couplant includes glycerol or water.
The method also includes:
The debonding defect feature modeling debonding defect area obtained according to detection, and judge whether debonding defect size meets the manufacture requirements of end sandwich component altogether.
The ultrasonic echo measurement apparatus of a kind of end sandwich component debonding defect altogether detection, it is characterised in that include data acquisition unit, supersonic generator and the ultrasound probe being sequentially connected with, described ultrasound probe is sticked on the metallic plate of end sandwich component altogether to be measured；Wherein, described data acquisition unit shows effective echo number and echo attenuation ratio.
The frequency of described ultrasound probe is 5-30Mhz, and probe diameter is 1-30 millimeter.
Described ultrasound probe is double crystal probe, contact probe, delay block probe or immersion type probe.
Compared with prior art, the invention have the advantages that
1) present invention uses ultrasound examination, ultrasound examination to be a kind of lossless detection methods, and it need not structure is carried out destructive testing.
2) present invention is when detecting sandwich component of the common end, initially sets up data base, can quickly judge the type of debonding defect and determine border and the area of debonding defect, judging whether structure glue cement amount meets required standard accordingly.
Accompanying drawing explanation
Fig. 1 is the structural representation of sandwich component of the common end, and wherein (a) is the component with metallic plate Yu glue-line debonding defect, and (b) is the component with glue-line Yu foam debonding defect；
Fig. 2 is the structural representation of measurement apparatus of the present invention；
Fig. 3 is scanning probe path schematic diagram；
Fig. 4 is ultrasound examination echo character curve synoptic diagram of the present invention；
Fig. 5 is embodiment of the present invention echo number-probe distance debonding defect frontier distance staqtistical data base；
Fig. 6 is method of testing schematic flow sheet of the present invention.
In figure, 1, metallic plate, 2, glue-line, 3, foam, debonding defect between 4, metallic plate and glue-line, debonding defect between 5, glue-line and foam, 6, data acquisition unit, 7, supersonic generator, 8, ultrasound probe, 9, couplant.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is implemented premised on technical solution of the present invention, gives detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, altogether end sandwich component include double layer of metal plate 1, the foam 3 that is located between double layer of metal plate 1 and the glue-line 2 being located between metallic plate 1 and foam 3, wherein, the material of metallic plate 1 is steel, aluminum, magnesium etc., the gluing adhesive that glue-line 2 uses is thermosetting resin adhesive, ger-bond, rubber-type adhesive or the combination of three kinds, foam 3 is Polymethacrylimide, polystyrene foam and hard polyurethane foams etc., and the thickness of whole end sandwich component altogether is 0.1-10 millimeter.
As shown in Figure 2, data acquisition unit 6, supersonic generator 7, ultrasound probe 8 are integrated into a system and sandwich component of the common end are carried out debonding defect and border detection thereof by the invention, data acquisition unit 6, supersonic generator 7, ultrasound probe 8 are sequentially connected with, and ultrasound probe 8 is sticked on the metallic plate 1 of end sandwich component altogether to be measured.During detection, ultrasound probe 8 moves along path shown in Fig. 3, and data acquisition unit 6 can show effective echo number and echo attenuation ratio, as shown in Figure 4 during detection.Supersonic generator 7 can occur the A-mode ultrasonic ripple of 1-30MHz；Ultrasound probe 8 is popped one's head in for contact, can be double crystal probe, contact probe, delay block probe or immersion type probe etc., and frequency is 10MHz, and the delay block end face diameter mated with probe is 7.87mm, postpones fast a length of 11.4mm.
When sandwich component different situations of the common end (without unsticking between unsticking, glue-line and foam between debonding defect, metallic plate and glue-line) position is detected by the present invention according to contact ultrasonic probe, in data acquisition unit, effective echo number difference of reflection carries out defects detection, generally, without unsticking position number of echoes between unsticking position number of echoes ＜ glue-line and foam between debonding defect position number of echoes ＜ metallic plate and glue-line.Measuring method concrete steps of the present invention are as shown in Figure 6:
In step s101, being installed on supersonic generator by ultrasound probe, before detection, rationally arrange the parameter of data acquisition unit, and coat couplant 9 on metallic plate 1, couplant 9 is the liquid such as glycerol or water.Data acquisition unit needs the parameter arranged to include gain, screen indication range, output result and automatic stay condition.In the present embodiment, gain G ain is 18dB, and screen indication range Range is 29mm, and output result is effective echo number BWE.
In step s102, utilize probe that by set path, exemplary position is carried out repeated ultrasonic Scanning Detction, setting up effective echo number of dissimilar debonding defect and probe and the data base of debonding defect frontier distance relation, described exemplary position includes without debonding defect position, metallic plate and glue-line debonding defect position and glue-line and foam debonding defect position.
In the present embodiment, the effective echo number obtained without the detection of debonding defect position is 5, and effective echo number that between metallic plate and glue-line, the detection of unsticking position obtains is 10, and effective echo number that between glue-line and foam, the detection of unsticking position obtains is 6.Meanwhile, at debonding defect boudary portion, the debonding defect area corresponding to contact ultrasonic probe is different, and in echo, effective echo number is different.
Ultrasound probe along when shown in Fig. 3, direction is detected, from a to d during, experience from without debonding defect position to there is debonding defect position metallic plate and glue-line, its echo number is gradually increased, and is finally reached stably.The echo number that at a, detection obtains is N1, is the detection number of echoes of N2, respectively zero defect position and metallic plate and glue-line unsticking position at b.At debonding defect boundary position, during detection, its side number of echoes is that (position b), opposite side number of echoes is N2 to N1.Probe moves along direction shown in Fig. 3, sets up the number of echoes N--probe data base away from debonding defect frontier distance t, as shown in Figure 5.
In step s103, ultrasound probe end face is close on metal sheet surface, along certain path, end sandwich component metal sheet surface altogether to be measured is carried out complete ultrasound examination, record result, echo number detection obtained is compared with data base, it may be judged whether there is debonding defect and there is what type of debonding defect；When judging that detection position exists debonding defect, by the contrast of unsticking position echo number Yu data base, determine debonding defect border.The debonding defect feature modeling debonding defect area obtained according to detection, and judge whether debonding defect size meets the manufacture requirements of end sandwich component altogether.
Claims (6)
1. a ultrasonic echo measuring method for end sandwich component debonding defect detection altogether, described interlayer structure of the common end
Part includes double layer of metal plate, the foam being located between double layer of metal plate and the glue-line being located between metallic plate and foam,
It is characterized in that, described measuring method comprises the following steps:
1) utilize ultrasound probe that by set path, exemplary position is carried out repeated ultrasonic Scanning Detction, set up difference
Effective echo number of type debonding defect and the ultrasound probe data base away from debonding defect frontier distance relation, institute
The exemplary position stated includes without debonding defect position, metallic plate and glue-line debonding defect position and glue-line and foam unsticking
Defective locations；
2) metal sheet surface to end sandwich component altogether to be measured carries out overall ultrasonic scanning detection, obtains according to detection
The comparing result of effective echo number and described data base, determine that debonding defect type and ultrasound probe are away from unsticking
Defect frontier distance.
The ultrasonic echo measurement side of a kind of end sandwich component debonding defect altogether the most according to claim 1 detection
Method, it is characterised in that before carrying out ultrasonic scanning detection, is applied to sandwich component surface, the common end by couplant.
The ultrasonic echo measurement side of a kind of end sandwich component debonding defect altogether the most according to claim 2 detection
Method, it is characterised in that described couplant includes glycerol or water.
The ultrasonic echo measurement side of a kind of end sandwich component debonding defect altogether the most according to claim 1 detection
Method, it is characterised in that also include:
Calculate debonding defect area according to the ultrasound probe that detection obtains away from debonding defect frontier distance, lack in unsticking
Falling into boudary portion, the debonding defect area corresponding to ultrasound probe is different, and in echo, effective echo number is different；
And judge whether debonding defect size meets the manufacture requirements of end sandwich component altogether.
The ultrasonic echo measurement side of a kind of end sandwich component debonding defect altogether the most according to claim 1 detection
Method, it is characterised in that described ultrasound probe is sticked on the metallic plate of end sandwich component altogether to be measured.
The ultrasonic echo measurement side of a kind of end sandwich component debonding defect altogether the most according to claim 1 detection
Method, it is characterised in that the frequency of described ultrasound probe is 5-30Mhz, a diameter of 1-30 millimeter.
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| CN106197331A (en) * | 2015-05-07 | 2016-12-07 | 上海通用汽车有限公司 | Ultrasonic wave detecting system |
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| CN111855813A (en) * | 2019-04-26 | 2020-10-30 | 中国石油化工股份有限公司 | Detection device and detection method |
| CN110530984A (en) * | 2019-09-26 | 2019-12-03 | 中国石油大学(华东) | A kind of ultrasonic detection method of pipeline coating defect |
| CN111257419A (en) * | 2020-02-03 | 2020-06-09 | 天津大学 | Extra-high voltage insulation pull rod interface defect detection device |
| CN111257417A (en) * | 2020-02-03 | 2020-06-09 | 天津大学 | Method for detecting interface defects of extra-high voltage insulating pull rod |
| CN114152422B (en) * | 2021-12-02 | 2024-04-05 | 国家石油天然气管网集团有限公司 | Method for detecting type of non-external defect of pipeline in oil and gas pipeline excavation site |
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