CN103776902A - Nonlinear ultrasound evaluating method for impact fatigue damage of metal bonding interface - Google Patents
Nonlinear ultrasound evaluating method for impact fatigue damage of metal bonding interface Download PDFInfo
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- CN103776902A CN103776902A CN201410017945.4A CN201410017945A CN103776902A CN 103776902 A CN103776902 A CN 103776902A CN 201410017945 A CN201410017945 A CN 201410017945A CN 103776902 A CN103776902 A CN 103776902A
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Abstract
The invention discloses a nonlinear ultrasound evaluating method for impact fatigue damage of a metal bonding interface, belonging to the field of ultrasonic nondestructive detection. According to the nonlinear ultrasound evaluating method, the defect of insensitivity in material mechanical performance degradation by parameters such as sound velocity, attenuation and impedance of ultrasonic waves is overcome, and the impact damage degree is objectively evaluated through a nonlinear coefficient. A testing method comprises the steps: firstly, testing an initial nonlinear coefficient of a material bonding interface, secondly, performing an impact test on a bonding structure, determining a nonlinear coefficient once every impacting for a certain times until the bonding structure is damaged; and regularizing the nonlinear coefficient, and establishing a curve relationship of the regularized nonlinear coefficient and the relative fatigue life. As a result, the regularized nonlinear coefficient is increased with the increase of the relative fatigue life. According to the nonlinear ultrasound evaluating method, a fatigue life relation of the metal bonding structure under an impact is established, an effective nondestructive detection method is provided for a large industrial bonding facility bearing the impact in future, and a great significance is obtained for ensuring the safety operation of industrial equipment and predicting the service life of the equipment.
Description
Technical field
The invention belongs to ultrasonic detecting technology field, the non-linear ultrasonic that is specifically related to the impact fatigue damage of a kind of metal adhesive interface detects, and can carry out the evaluation of effective quantification.
Background technology
At present, modern adhesive technology has a wide range of applications in numerous industrial circles as a new technology.Such as, in aircraft industry, airframe adopts after adhesive technology, can save more than 311000 parts and 16000 road assembly processes, makes architecture quality alleviate 15%, and total expenses is saved 25%-35%.Moreover, bonding agent consumption is also increasing, and a Boeing-747 aircraft and a C-5A milky way aircraft utilization glued membrane area reach 16200m
2.Also extensive application of adhesive technology on manned and unmanned spacecraft, as antenna, cold plate, the critical elements such as impact damper are to be all fixed on airship by adhesive technology.
Bonding interface comprises the bonding of metal and metal, metal and nonmetallic bonding.And the bonding of metal and metal is the bonding form that a kind of common use amount is very large.Metal adhesive member, due to better performances, often bears larger Impact Load, and this just makes it produce certain potential safety hazard.How metal adhesive structure is made to effective Damage Evaluation under percussive action and become the problem of numerous industrial circle growing interests.Early stage ultrasonic non-destructive inspection techniques is mainly used to detect hole, the crack in bonding plane and the gross imperfection such as come unstuck, but carries out direct, quantitative assessment and detect just helpless for problems such as the life predictions of bonding strength, bonding force, impact property degenerate case and the bonding plane of metal adhesive face.
Along with the research that deepens constantly of ultrasonic detecting technology, non-linear ultrasonic detects becomes a kind of practical simple nondestructiving detecting means.Much research shows, hyperacoustic nonlinear effect is very responsive to the performance of material., at test specimen internal communication two times of producing, the high-frequency harmonic of treble frequency are analyzed by ultrasound wave, found out material property at nonlinear factor corresponding to different catagen phases, just can carry out effective quantitative evaluation to the fatigue damage of material.
Summary of the invention
In order to overcome ultrasonic detecting technology in the time detecting bonding quality, the parameters such as the velocity of sound of ripple, decay, impedance are degenerated insensitive to material mechanical performance, cannot make the deficiency of accurate judgement, the present invention proposes the non-linear ultrasonic lossless detection method of a kind of metal adhesive structure fatigue damage under Impact Load.
The technical solution adopted for the present invention to solve the technical problems is:
The mensuration of step 1 bonded structure prima facies to nonlinear factor
Utilize ultrasonic transducer excitation ultrasound ripple signal in a side of bonded structure, utilize ultrasonic transducer to receive the ultrasonic signal that sees through bonded structure at the opposite side of bonded structure; The ultrasonic signal receiving is carried out to Fourier transform, obtain the fundamental frequency amplitude A in the ultrasonic signal of computer recording
1with frequency multiplication amplitude A
2;
Definition relative nonlinear factor beta: β=A
2/ A
1 2;
Calculate prima facies to nonlinear factor, be designated as β
0;
The impact fatigue of step 2 bonded structure loads
Bonded structure is placed on drop hammer impact testing machine, sets shock height, impact mass, number of shocks, start afterwards to impact.After impact completes, bonded structure is taken off from testing machine, carry out non-linear ultrasonic test.
The mensuration of step 3 bonded structure regularization relative nonlinear coefficient
Utilize ultrasonic transducer excitation ultrasound ripple signal in a side of bonded structure, utilize ultrasonic transducer to receive the ultrasonic signal that sees through bonded structure at the opposite side of bonded structure; The ultrasonic signal receiving is carried out to Fourier transform, obtain the fundamental frequency amplitude A in the ultrasonic signal of computer recording
1with frequency multiplication amplitude A
2; According to the definition of relative nonlinear coefficient in step 1, calculate corresponding nonlinear factor β; By this nonlinear factor β divided by the initial nonlinear factor β in step 1
0carry out regularization, obtain regularization relative nonlinear coefficient value;
The non-linear ultrasonic evaluation of step 5 bonding interface fatigue damage
Graph of relation according to regularization relative nonlinear coefficient with relative fatigue lifetime, carries out non-linear ultrasonic evaluation to the fatigue damage of bonding interface.The regularization relative nonlinear coefficient that test obtains is larger, shows that the fatigue damage degree of bonded structure is larger.
Beneficial effect of the present invention is:
Set up the fatigue lifetime relation of metal adhesive structure under percussive action, for the bonding facility of large scale industry from now on provides a kind of effective lossless detection method, for ensureing commercial unit safe operation, predict device is significant serviceable life.
Accompanying drawing explanation
Fig. 1 is non-linear ultrasonic test macro schematic diagram.
Fig. 2 is bonded structure test specimen schematic diagram.
Fig. 3 be regularization relative nonlinear coefficient with relative fatigue lifetime between graph of relation.
In figure: oscillograph 1, main frame 2, computing machine 3, preposition decay and low-pass filtering module 4, ultrasonic transducer 5, bonding test specimen 6, ultrasonic transducer 7.
Embodiment
In Fig. 1, comprising: oscillograph 1, main frame 2, computing machine 3, preposition decay and low-pass filtering module 4, ultrasonic excitation device 5, ultrasonic probe, ultrasonic receiver 7.The model of oscillograph 1 is TDS3034B, and the model of main frame 2 is Ritec SNAP-0.25-7-G2, and the model of preposition decay and low-pass filtering module 4 is RLP-2.Utilize concentric cable that the signal output part A of main frame 2 is connected with the input end of preposition decay and low-pass filtering module 4, the output terminal of preposition decay and low-pass filtering module 4 is connected with ultrasonic excitation device 5, the receiving end B of the signal access host 2 of ultrasonic probe, ultrasonic receiver 7, the signal monitoring port C of main frame 2 is connected with oscillograph 1.Described ultrasonic excitation device 5 and ultrasonic probe, ultrasonic receiver 7 are all ultrasonic transducers.
A nonlinear ultrasonic evaluation method for bonding interface impact fatigue damage, comprises the following steps:
The mensuration of step 1 bonded structure prima facies to nonlinear factor
Bonded structure as shown in Figure 2.In Fig. 1, a side of bonded structure 6 is utilized ultrasonic transducer 5 excitation ultrasound ripple signals, utilizes ultrasonic transducer 7 to receive the ultrasonic signal that sees through bonded structure at the opposite side of bonded structure; The ultrasonic signal receiving is carried out to Fourier transform, obtain the fundamental frequency amplitude A in ultrasonic signal that computing machine 3 records
1with frequency multiplication amplitude A
2;
Definition relative nonlinear factor beta: β=A
2/ A
1 2;
Calculate prima facies to nonlinear factor, be designated as β
0;
The fatigue loading of step 2 bonded structure
Bonded structure 6 is placed on drop hammer impact testing machine, sets shock height 200mm, impact mass 4000g, number of shocks 20 times, then impact.Complete after impact, bonded structure 6 is unloaded from experimental machine, carry out non-linear ultrasonic test;
The mensuration of step 3 bonded structure regularization relative nonlinear coefficient
Utilize ultrasonic transducer 5 excitation ultrasound ripple signals in a side of the bonded structure 6 unloading from experimental machine, utilize ultrasonic transducer 7 to receive the ultrasonic signal that sees through bonded structure 6 at the opposite side of bonded structure 6; The ultrasonic signal receiving is carried out to Fourier transform, obtain the fundamental frequency amplitude A in ultrasonic signal that computing machine 3 records
1with frequency multiplication amplitude A
2; According to the definition of relative nonlinear coefficient in step 1, calculate corresponding nonlinear factor β; By this nonlinear factor β divided by the initial nonlinear factor β in step 1
0carry out regularization, obtain regularization relative nonlinear coefficient value;
The repetitive operation of step 5 test
Again choose the operation of 4 bonded structure test specimen repeating steps one to step 4, the regularization relative nonlinear coefficient that obtains second bonded structure test specimen is respectively 1,0.9958,1.0856,0.9342,1.0457,1.4737,1.5422,4.2288, is relatively respectively 0,0.1429,0.2857,0.4286,0.5714,0.7143,0.8571,1 fatigue lifetime; The regularization relative nonlinear coefficient of the 3rd bonded structure test specimen is respectively 1,1.1105,2,1.6975,3,3.7782,4, is relatively respectively 0,0.1667,0.3333,0.5,0.6667,0.8333,1 fatigue lifetime; The regularization relative nonlinear coefficient of the 4th bonded structure test specimen is respectively 1,1.3355,1.1942,2.3904,2.9266,5.1470, is relatively respectively 0,0.2,0.4,0.6,0.8,1 fatigue lifetime; The regularization relative nonlinear coefficient of the 5th bonded structure test specimen is respectively 1,1.2182,1.7830,2.4520,3.0397, is relatively respectively 0,0.25,0.5,0.75,1 fatigue lifetime.To the regularization relative nonlinear coefficient of test specimen 5 and corresponding relative fatigue lifetime, finally obtain the relation of bonded structure regularization relative nonlinear coefficient and relative fatigue lifetime, as shown in Figure 3 according to test specimen 1.
The non-linear ultrasonic evaluation of step 6 bonding interface fatigue damage
Graph of relation according to regularization relative nonlinear coefficient with relative fatigue lifetime, carries out non-linear ultrasonic evaluation to the fatigue damage of bonding interface.As seen from Figure 3, relative fatigue lifetime is larger, shows that damage is larger, and the regularization relative nonlinear coefficient that corresponding test obtains is larger.
Claims (4)
1. a nonlinear ultrasonic evaluation method for bonding interface impact fatigue damage, is characterized in that, comprises following steps:
The mensuration of step 1 bonded structure prima facies to nonlinear factor
Choose a bonded structure test specimen, at a side excitation ultrasound ripple signal of test specimen, receive at the opposite side of test specimen the ultrasonic signal that sees through bonded structure; The ultrasonic signal receiving is carried out to Fourier transform, obtain the fundamental frequency amplitude A in the ultrasonic signal of computer recording
1with frequency multiplication amplitude A
2;
Definition relative nonlinear factor beta: β=A
2/ A
1 2;
Calculate prima facies to nonlinear factor, be designated as β
0;
The impact fatigue of step 2 bonded structure loads
Bonded structure is placed on drop hammer impact testing machine, sets shock height, impact mass, number of shocks, then impact.Complete after impact, bonded structure is unloaded from experimental machine;
The mensuration of step 3 bonded structure regularization relative nonlinear coefficient
At a side excitation ultrasound ripple signal of the bonded structure unloading, receive at the opposite side of bonded structure the ultrasonic signal that sees through bonded structure from experimental machine; The ultrasonic signal receiving is carried out to Fourier transform, obtain the fundamental frequency amplitude A in the ultrasonic signal of computer recording
1with frequency multiplication amplitude A
2; According to the definition of relative nonlinear coefficient in step 1, calculate corresponding nonlinear factor β; By this nonlinear factor β divided by the initial nonlinear factor β in step 1
0carry out regularization, obtain regularization relative nonlinear coefficient value;
Step 4 repeating step two is to the operation of step 3, until bonded structure destroys, records final fatigue loading number of times; Fatigue loading number of times during by each repeating step two, divided by final fatigue loading number of times, obtains the relative fatigue lifetime after each repeating step two; The regularization relative nonlinear coefficient obtaining according to each repeating step three and corresponding relative fatigue lifetime, finally obtain the regularization relative nonlinear coefficient of a test specimen and the relation of relative fatigue lifetime;
The repetitive operation of step 5 test
Again choose 3 to 5 bonded structure test specimens, repeating step one is to the operation of step 4, thereby obtains the regularization relative nonlinear coefficient of multiple bonded structure test specimens and the relation of relative fatigue lifetime;
The non-linear ultrasonic evaluation of step 6 bonding interface impact fatigue damage
Graph of relation according to regularization relative nonlinear coefficient with relative fatigue lifetime, carries out non-linear ultrasonic evaluation to the impact fatigue damage of bonding interface.
2. nonlinear ultrasonic evaluation method according to claim 1, is characterized in that: the excitation ultrasound ripple signal described in step 1 and step 3 and received ultrasonic signal are all ultrasonic transducers.
3. the test macro that the nonlinear ultrasonic evaluation method of claim 1 uses, comprising: oscillograph, main frame, computing machine, preposition decay and low-pass filtering module, ultrasonic excitation device, ultrasonic probe, ultrasonic receiver; Described ultrasonic excitation device and ultrasonic probe, ultrasonic receiver are placed in respectively the both sides of bonded structure test specimen; Utilize concentric cable that the signal output part of main frame is connected with the input end of preposition decay and low-pass filtering module; The output terminal of preposition decay and low-pass filtering module is connected with ultrasonic excitation device; The receiving end of the signal access host of ultrasonic probe, ultrasonic receiver; The signal monitoring port of main frame is connected with oscillograph.
4. non-linear ultrasonic test macro according to claim 3, is characterized in that: described ultrasonic excitation device and ultrasonic probe, ultrasonic receiver are all ultrasonic transducers.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483217A (en) * | 2014-12-31 | 2015-04-01 | 华侨大学 | Abrasive particle impact fatigue test equipment |
| CN105890792A (en) * | 2014-08-28 | 2016-08-24 | 江苏万力机械股份有限公司 | Temperature detection method suitable for fatigue damage of cutter |
| CN107422034A (en) * | 2017-06-12 | 2017-12-01 | 东南大学 | A kind of asphaltaggregate interfacial fatigue test method based on supercritical ultrasonics technology |
| CN107422033A (en) * | 2017-03-20 | 2017-12-01 | 华南理工大学 | A kind of method of determination and evaluation of glass curtain wall structure glue sticking intensity |
| CN108982252A (en) * | 2018-06-07 | 2018-12-11 | 中国科学院上海微系统与信息技术研究所 | A kind of new testing device for temperature properties and test method of double-sided adhesive viscosity mechanical behavior |
| CN109142532A (en) * | 2018-09-30 | 2019-01-04 | 武汉大学 | A kind of lossless detection method and device of the damage of high martensitic chromium heat resisting steel connector creep hole |
| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890792A (en) * | 2014-08-28 | 2016-08-24 | 江苏万力机械股份有限公司 | Temperature detection method suitable for fatigue damage of cutter |
| CN104483217A (en) * | 2014-12-31 | 2015-04-01 | 华侨大学 | Abrasive particle impact fatigue test equipment |
| CN107422033A (en) * | 2017-03-20 | 2017-12-01 | 华南理工大学 | A kind of method of determination and evaluation of glass curtain wall structure glue sticking intensity |
| CN107422033B (en) * | 2017-03-20 | 2019-12-10 | 华南理工大学 | Detection and evaluation method for bonding strength of glass curtain wall structural adhesive |
| CN107422034A (en) * | 2017-06-12 | 2017-12-01 | 东南大学 | A kind of asphaltaggregate interfacial fatigue test method based on supercritical ultrasonics technology |
| CN107422034B (en) * | 2017-06-12 | 2020-03-31 | 东南大学 | Asphalt-aggregate interface fatigue test method based on ultrasonic method |
| CN108982252A (en) * | 2018-06-07 | 2018-12-11 | 中国科学院上海微系统与信息技术研究所 | A kind of new testing device for temperature properties and test method of double-sided adhesive viscosity mechanical behavior |
| CN109142532A (en) * | 2018-09-30 | 2019-01-04 | 武汉大学 | A kind of lossless detection method and device of the damage of high martensitic chromium heat resisting steel connector creep hole |
| 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 |
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Application publication date: 20140507 |