CN102426192A - Method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of metal material - Google Patents
Method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of metal material Download PDFInfo
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Abstract
The invention relates to a method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of a metal material. The method comprises the following steps: 1) excitation and reception of Rayleigh waves; 2) detection of reliability of a testing system; 3) measurement of non-linear coefficients when the surface of a test piece has damage of different degrees; 4) repeatable operation of test. Compared to the method of using body waves for ultrasonic nondestructive test, the non-linear ultrasonic evaluation method provided in the invention has the characteristic that Rayleigh surface waves are especially suitable for measurement of non-linear coefficients of large-scale complex plate structures. According to the invention, it is only needed to carry out excitation and measurement of supersonic waves at one side of a structure during measuring, which enables measuring to be simple and easy; the Rayleigh surface waves have advantages favorable for measuring, e.g., concentration of energy on the surface of a structure, a long propagation distance, etc.; operation is simple and easy, so the method is especially suitable for on-site detection of structural elements; effective evaluation of early damage and degeneration of mechanical properties of a material structure can be realized by using the non-linear ultrasonic method.
Description
Technical field
The present invention relates to a kind of nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage.
Background technology
The existing structure element in plant equipment and engineering structure; Under the action of external load (comprising environmental activity), its life-span generally can be divided into three phases: initial and accumulation (micropore and micro-crack) and the last fracture failure of early stage mechanical property degradation (comprising the aging and degeneration of physics, chemistry), damage.Wherein, research has widely been carried out in the initial and accumulation of damage on mesomechanics, damage mechanics and both subject combining bases.Now also existing numerous data and a large amount of models come that prediction loop loads, the crack propagation under the environmental impact is until last destruction.Yet people but know little about it for performance degradation and to the influence of material long-term action.Although because the interaction and the Effect of Environmental of multiple load, the differentiation of this several stages is also indeterminate.But, it often is the most of the time that the phase one (being early stage mechanical property degradation) has occupied the whole life-span for the good structural detail of design.For example; There are some researches show: concerning the structural metallic materials that bears cyclic loading; A large amount of formation that produce resident slip band of dislocation group internally; Again in the resident slip band nucleation of micro-crack, grow up, until the formation of macroscopic cracking, this stage accounts for the structured material 80-90% of whole fatigue lifetime.Therefore, the Ultrasonic NDT of research and development material and the early stage mechanical property degradation of structure just seems very important.
Ultrasonic non-destructive inspection techniques all has a wide range of applications as one of obligato detection means in Modern Industry Products manufacturing and the use in all fields.The ultrasonic non-destructive inspection techniques of comparative maturity is primarily aimed at the defective initial sum accumulation stage and the ultimate failure stage of material or structure at present, like the existence and the distribution of defectives such as the micropore in the detecting material, micro-crack.Wherein mainly be applied to the information such as time-histories, the velocity of sound, decay, impedance, scattering of ripple.But these parameters are very insensitive to the degeneration of material and the early stage mechanical property of structure.
In recent years, the non-linear ultrasonic technology has caused people's extensive attention.Increasing research shows that material property degradation and hyperacoustic nonlinear effect are closely related.Such as concerning metal material; Bear at crystal in the loading procedures such as fatigue, high-temerature creep, high speed impact; And in shear zone and crack front, inside exists high-sequential and dislocation space structure highly heterogeneous, is referred to as dislocation configuration or dislocation pattern.Material different can produce different dislocation configurations with the different mechanical process.Though these dislocation configurations are not obvious to linear dimensions such as the velocity of sound, decay, impedance and the scattering influence of ripple; But because the existence of these dislocation configurations; With making the ultrasound wave waveform of wherein propagating produce distortion; Cause having in the ultrasound wave of single-frequency the generation of high-frequency harmonic, will produce the high-order harmonic wave of integer multiple frequencies such as two times, three times when promptly the ultrasound wave of single-frequency is propagated in medium with nonlinear characteristic or structure.Therefore through measurement Research to these high-frequency harmonics; Find it to be in the acoustics nonlinear factor of different phase; Just can understand the variation of material internal microcosmic dislocation configuration, thereby effective Non-Destructive Testing is made in the early stage mechanical property degradation and the damage of material and structure.
Summary of the invention
For solving the problems of the technologies described above, the present invention provides a kind of auspicious Leibo that utilizes simple in structure, easy to use to carry out the nonlinear ultrasonic evaluation method of metal material surface damage; Utilization is bonded in the lithium niobate crystal chip transducer on the organic glass wedge, utilizes couplant that the organic glass wedge is pasted on then and has the metal plate-like test specimen surface excitation and the auspicious Leibo of reception of surface damage in various degree.Reception is obtained method that auspicious Leibo signal carries out multiple averaging to improve the signal to noise ratio (S/N ratio) of auspicious Leibo signal; And effectively suppress stochastic factor in the test process; To the auspicious Leibo signal application Hanning window function after the multiple averaging; Eliminate of the influence of instrument and equipment transient state process, carry out FFT then, obtain fundamental frequency and radio-frequency component A in the signal measurement result
1, A
2, with A
1, A
2Bring formula into and can obtain existing the nonlinear factor of surface damage test specimen in various degree.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage of the present invention may further comprise the steps:
1) the exciting and receiving of auspicious Leibo: the lithium niobate crystal chip transducer is bonded on the organic glass wedge, utilizes couplant that the organic glass wedge is sticked on magnesium alloy test specimen surface then; Utilize Ritec SNAP-0.25-7-G2 non-linear ultrasonic test macro main frame to produce ultrasonic signal, ultrasonic signal is in the auspicious Leibo of almag test specimen surface excitation; At the other end of test specimen, utilize the lithium niobate crystal chip transducer organic glass wedge identical to receive auspicious Leibo equally with the inclination angle, the lithium niobate crystal chip transducer centre frequency that receives ultrasonic signal is 4MHz;
2) the test macro reliability detects: under the test specimen situation identical with propagation distance; The situation that the is employed in different input voltages drive pressure electric transducer that gets off; And measure corresponding auspicious Leibo signal; Through to the different driving voltage detecting to auspicious Leibo signal carry out FFT through computing machine, obtain the fundamental frequency amplitude A of auspicious Leibo under the different driving voltage
1With frequency multiplication amplitude A
2Can know the frequency multiplication amplitude A in the ultrasonic signal through matched curve
2Square A with the fundamental frequency amplitude
1 2Approach proportional relation, utilize this non-linear ultrasonic test macro can record the nonlinear factor of test specimen exactly;
3) test specimen surface exists the nonlinear factor when damaging in various degree to measure: after utilizing the electronic universal experimental machine that the magnesium alloy test specimen is loaded into specific stress, test specimen is unloaded from the electronic universal experimental machine, utilize experimental provision to excite then and receive auspicious Leibo; Auspicious Leibo signal to receiving carries out signal Processing, promptly signal is added Hanning window and carries out Fast Fourier Transform (FFT), fundamental frequency amplitude A in the auspicious Leibo ultrasonic signal that obtains being received
1With frequency multiplication amplitude A
2After accomplishing above-mentioned test, again test specimen is stretched to the stress that once loads greater than preceding, and once more the test specimen that unloads from the electronic universal experimental machine is carried out same non-linear ultrasonic test, obtain ultrasound wave fundamental frequency and the frequency multiplication amplitude of test specimen behind this stress; Repeat above-mentioned steps, necking phenomenon occurs, take place till the intensity inefficacy up to test specimen; Definition is also adopted following relative nonlinear coefficient based on fundamental frequency and frequency multiplication amplitude: β
R=A
2/ A
1 2
Calculate the relative nonlinear factor beta of auspicious Leibo according to the formula following formula
R, the relative nonlinear coefficient when the note test specimen loads without stress is β
R0, test specimen is loaded the relative nonlinear factor beta behind the different stress
RDivided by β
R0Carry out regularization, obtain based on the regularization relative nonlinear coefficient of fundamental frequency, frequency multiplication and the graph of relation between stress;
4) the repeatability operation of test: piezoelectric sensor and the organic glass wedge that will excite and receive auspicious Leibo unload from test specimen fully to be removed; Clean out couplant; Complete then repeating step 1) work; Be about to the lithium niobate crystal chip transducer and be bonded on the organic glass wedge, utilize couplant that the organic glass wedge is sticked on metal plate-like test specimen surface then, excite and receive the auspicious thunder surface wave of certain intensity; Then repeating step 3 again) work in; Same test specimen, different stress is carried out exciting and receiving of auspicious Leibo signal after loading; Carry out 2-3 time repeated test,, can obtain existing the nonlinear factor of surface damage test specimen in various degree to guarantee the reliable and accurate of test result.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage of the present invention; In step 1): the ultrasonic signal that non-linear ultrasonic test macro main frame produces is that 10-16 cycle, frequency are the sine pulse string ultrasonic signal of 2MHz; After this signal carries out impedance matching, attenuator and low-pass filter through 50 ohm of terminals; Excitation is bonded in the lithium niobate crystal chip transducer on the organic glass wedge, and ultrasonic signal is in the auspicious Leibo of almag test specimen surface excitation.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage of the present invention; In step 1): utilize oscillograph that the signal that collects is carried out 525 times average; Improving the signal to noise ratio (S/N ratio) of auspicious Leibo signal, and effectively suppress stochastic factor in the test process; To the auspicious Leibo signal application Hanning window function after the multiple averaging, eliminate of the influence of instrument and equipment transient state process to measurement result.
Beneficial effect compared with prior art of the present invention is:
1) compares with utilizing bulk wave to carry out Ultrasonic NDT, utilize auspicious thunder surface wave to be particularly suitable for large complicated plate structure is carried out the measurement of nonlinear factor.In measuring process, a side that only is used in structure carry out hyperacoustic excite and measure just passable, thereby make measuring process simple and easy to do.And auspicious thunder surface wave also has concentration of energy in body structure surface, the propagation distance advantage that is beneficial to very much measurement such as far away.
2) the lithium niobate crystal chip transducer is bonded on the organic glass wedge, utilizes couplant that the method that the organic glass wedge sticks on metal plate-like test specimen surface excitation and the auspicious thunder surface wave of reception is simple then, be particularly suitable for the scene of structural elements is detected.
3) conventional supersonic detection method utilization is linear parameters such as hyperacoustic velocity of sound, decay; These parameters are very insensitive to the early stage mechanical property degradation of material, and the ultrasound non-linear coefficient is degenerated very sensitive to earlier damage and mechanical property that material structure occurs before the macroscopic cracking.Utilize the non-linear ultrasonic method to carry out effectively evaluating to the earlier damage and the mechanical property degeneration of material structure.
Description of drawings
Fig. 1 is the described structural representation that utilizes the measurement mechanism that auspicious Leibo carries out adopting in the nonlinear ultrasonic evaluation method of metal material surface damage of the embodiment of the invention;
To be that the embodiment of the invention is described utilize auspicious Leibo to carry out the auspicious Leibo signal graph that excites and receive in the nonlinear ultrasonic evaluation method of metal material surface damage to Fig. 2;
To be that the embodiment of the invention is described utilize in the nonlinear ultrasonic evaluation method that auspicious Leibo carries out metal material surface damage frequency multiplication amplitude A under different exciting voltages to Fig. 3
2With fundamental frequency magnitude squared A
1 2Between graph of a relation;
To be that the embodiment of the invention is described utilize in the nonlinear ultrasonic evaluation method that auspicious Leibo carries out metal material surface damage based on the regularization relative nonlinear coefficient of fundamental frequency, frequency multiplication and the graph of a relation between stress Fig. 4;
To be that the embodiment of the invention is described utilize in the nonlinear ultrasonic evaluation method that auspicious Leibo carries out metal material surface damage based on the regularization relative nonlinear coefficient of the stress wave factor and the relation between stress Fig. 5;
To be that the embodiment of the invention is described utilize in the nonlinear ultrasonic evaluation method that auspicious Leibo carries out metal material surface damage based on the nonlinear factor of fundamental frequency, frequency multiplication amplitude and comparison diagram based on the nonlinear factor of the stress wave factor Fig. 6.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Shown in Fig. 1-6, a kind of nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage may further comprise the steps:
1) the exciting and receiving of auspicious Leibo: lithium niobate crystal chip transducer 4 is bonded on the organic glass wedge, utilizes couplant that organic glass wedge 3 is sticked on magnesium alloy test specimen 2 surfaces then; Utilize Ritec SNAP-0.25-7-G2 non-linear ultrasonic test macro main frame 1 to produce ultrasonic signal, ultrasonic signal is in the auspicious Leibo of almag test specimen 2 surface excitations; At the other end of test specimen, utilize the lithium niobate crystal chip transducer organic glass wedge identical to receive auspicious Leibo equally with the inclination angle, the lithium niobate crystal chip transducer centre frequency that receives ultrasonic signal is 4MHz;
2) the test macro reliability detects: under the test specimen situation identical with propagation distance; The situation that the is employed in different input voltages drive pressure electric transducer that gets off; And measure corresponding auspicious Leibo signal; Through to the different driving voltage detecting to auspicious Leibo signal carry out FFT through computing machine 9, obtain the fundamental frequency amplitude A of auspicious Leibo under the different driving voltage
1With frequency multiplication amplitude A
2Can know the frequency multiplication amplitude A in the ultrasonic signal through matched curve
2Square A with the fundamental frequency amplitude
1 2Approach proportional relation, utilize this non-linear ultrasonic test macro can record the nonlinear factor of test specimen exactly;
3) test specimen surface exists the nonlinear factor when damaging in various degree to measure: after utilizing the electronic universal experimental machine that the magnesium alloy test specimen is loaded into specific stress, test specimen is unloaded from the electronic universal experimental machine, utilize experimental provision to excite then and receive auspicious Leibo; Auspicious Leibo signal to receiving carries out signal Processing, promptly signal is added Hanning window and carries out Fast Fourier Transform (FFT), fundamental frequency amplitude A in the auspicious Leibo ultrasonic signal that obtains being received
1With frequency multiplication amplitude A
2After accomplishing above-mentioned test, again test specimen is stretched to the stress that once loads greater than preceding, and once more the test specimen that unloads from the electronic universal experimental machine is carried out same non-linear ultrasonic test, obtain ultrasound wave fundamental frequency and the frequency multiplication amplitude of test specimen behind this stress; Repeat above-mentioned steps, necking phenomenon occurs, take place till the intensity inefficacy up to test specimen; Definition is also adopted following relative nonlinear coefficient based on fundamental frequency and frequency multiplication amplitude: β
R=A
2/ A
1 2
Calculate the relative nonlinear factor beta of auspicious Leibo according to the formula following formula
R, the relative nonlinear coefficient when the note test specimen loads without stress is β
R0, test specimen is loaded the relative nonlinear factor beta behind the different stress
RDivided by β
R0Carry out regularization, obtain based on the regularization relative nonlinear coefficient of fundamental frequency, frequency multiplication and the graph of relation between stress, as shown in Figure 4; In the stage of stress less than 125MPa, the variation of nonlinear factor is quite small; After stress surpassed 125MPa, nonlinear factor slowly increased with the increase of stress, and particularly after stress was greater than 150MPa, nonlinear factor had suitable obvious variation; After stress surpassed yield limit 178MPa, nonlinear factor was more obvious with the variation of stress; Stress reaches strength degree non-linear hour coefficient and reaches maximum.Above-mentioned non-linear ultrasonic test result is directly related with the mechanical property of AZ31 magnalium test specimen under the tensile load effect.In the standard tensile test to AZ31 magnalium test specimen, after stress reached 150MPa, test specimen began to occur afterflow; After stress reached yield limit, strain significantly increased.The plasticity damage that this explanation utilizes ultrasound non-linear coefficient that the test of auspicious Leibo obtains can the characterizing metal material surface under stretching action, to cause.
4) the repeatability operation of test: piezoelectric sensor and the organic glass wedge that will excite and receive auspicious Leibo unload from test specimen fully to be removed; Clean out couplant; Complete then repeating step 1) work; Be about to the lithium niobate crystal chip transducer and be bonded on the organic glass wedge, utilize couplant that the organic glass wedge is sticked on metal plate-like test specimen surface then, excite and receive the auspicious thunder surface wave of certain intensity; Then repeating step 3 again) work in; Same test specimen, different stress is carried out exciting and receiving of auspicious Leibo signal after loading; Carry out 2-3 time repeated test,, can obtain existing the nonlinear factor of surface damage test specimen in various degree to guarantee the reliable and accurate of test result.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage of the present invention; In step 1): the ultrasonic signal that non-linear ultrasonic test macro main frame 1 produces is that 10-16 cycle, frequency are the sine pulse string ultrasonic signal of 2MHz; This signal through 50 ohm of terminals 5 carry out impedance matching, attenuator 6 and low-pass filter 7 after; Excitation is bonded in the lithium niobate crystal chip transducer 4 on the organic glass wedge 3, and ultrasonic signal is in the auspicious Leibo of almag test specimen 2 surface excitations.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage of the present invention; In step 1): utilize 8 pairs of signals that collect of oscillograph to carry out 525 times average; Improving the signal to noise ratio (S/N ratio) of auspicious Leibo signal, and effectively suppress stochastic factor in the test process; To the auspicious Leibo signal application Hanning window function after the multiple averaging, eliminate of the influence of instrument and equipment transient state process to measurement result.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out metal material surface damage of the present invention, in step 1): in isotropy, evenly, in the semispace elastic body of linear elasticity, the Rayleigh velocity of wave propagation satisfies the Rayleigh equation:
Wherein, c
R, c
L, c
TBe respectively the velocity of wave of Rayleigh ripple, compressional wave and shear wave in the solid.To Poisson ratio v
PElastomeric material in 0～0.5 scope, but the speed approximate representation that the Rayleigh ripple is propagated during for the plane on its surface is:
So, fast for (to get v by the Rayleigh wave-wave that following formula can obtain in the magnalium
P=0.33):
According to the Snell theorem, excite that the corresponding incident angle of compressional wave should be in the wedge of auspicious Leibo:
Calculate the wedge shape and size that the present invention designed according to last like incident angle, lithium niobate piezoelectric chip transducer, wedge and test specimen are installed together the device that excites auspicious Leibo.Reflection wave is to the influence of test in the wedge in order to reduce, and two surface working with wedge become dentation respectively.
The nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage of the present invention; When carrying out based on the plasticity of the stress wave factor that damage is estimated: utilizing in the non-linear ultrasonic test that auspicious Leibo carries out, the auspicious thunder first-harmonic and the second harmonic time-domain signal that receive can be expressed as in form:
Wherein, A
r(t) be modulation time domain ripple bag, f
rBe fundamental frequency or two frequency multiplication carrier frequencies,
Expression carrier wave (being ultrasonic signal) is from exciting the phase shift after transducer propagates into receiving transducer.Behind different stresses, a road be linked into main frame Input 1 end with what receive auspicious Leibo ultrasonic signal on the test specimen, receive fundamental signal; Another road is linked into main frame Input 2 ends, receives the harmonic signal that obtains after amplifying through Hi-pass filter 10 filtering, prime amplifier 11.The gain that fundamental frequency signal is set is 32dB, and integration amplitude conversion ratio is 110V/ (Vms); The gain of frequency-doubled signal is 46dB, and integration amplitude conversion ratio is 196V/ (Vms).Respectively fundamental frequency, frequency-doubled signal are carried out sweep measurement, can get the relation of carrier signal fundamental frequency amplitude
frequency multiplication amplitude
and frequency.Define the ultrasonic stress wave factor:
Define a nonlinear factor β based on the ultrasonic stress wave factor
1R:
So can get corresponding regularization nonlinear factor β
1R/ β
1R0With the variation relation of stress, as shown in Figure 5.Increase with loading stress increases based on the nonlinear factor of the stress wave factor in same auspicious Leibo.The plasticity damage that can the characterizing metal material surface under stretching action, causes based on the nonlinear factor of the stress wave factor that this explanation utilizes that the test of auspicious Leibo obtains.Shown in Figure 6 is to based on the nonlinear factor of fundamental frequency, frequency multiplication amplitude and contrast based on the nonlinear factor of the stress wave factor; Near the yield limit of test specimen; Both are with the variation relation basically identical of stress, but near the strength degree of test specimen the time, both gaps increase.Because the nonlinear factor ratio based on the ultrasonic stress wave factor is more obvious with the variation of stress based on the nonlinear factor of fundamental frequency, frequency multiplication amplitude, the latter is more responsive to damage.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and modification, these improve and modification also should be regarded as protection scope of the present invention.
Claims (3)
1. a nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage is characterized in that, may further comprise the steps:
1) the exciting and receiving of auspicious Leibo: the lithium niobate crystal chip transducer is bonded on the organic glass wedge, utilizes couplant that the organic glass wedge is sticked on magnesium alloy test specimen surface then; Utilize non-linear ultrasonic test macro main frame to produce ultrasonic signal, ultrasonic signal is in the auspicious Leibo of almag test specimen surface excitation; At the other end of test specimen, utilize the lithium niobate crystal chip transducer organic glass wedge identical to receive auspicious Leibo equally with the inclination angle, the lithium niobate crystal chip transducer centre frequency that receives ultrasonic signal is 4MHz;
2) the test macro reliability detects: under the test specimen situation identical with propagation distance; The situation that the is employed in different input voltages drive pressure electric transducer that gets off; And measure corresponding auspicious Leibo signal; Through to the different driving voltage detecting to auspicious Leibo signal carry out FFT through computing machine, obtain the fundamental frequency amplitude A of auspicious Leibo under the different driving voltage
1With frequency multiplication amplitude A
2Can know the frequency multiplication amplitude A in the ultrasonic signal through matched curve
2Square A with the fundamental frequency amplitude
1 2Approach proportional relation, utilize this non-linear ultrasonic test macro can record the nonlinear factor of test specimen exactly;
3) test specimen surface exists the nonlinear factor when damaging in various degree to measure: after utilizing the electronic universal experimental machine that the magnesium alloy test specimen is loaded into specific stress, test specimen is unloaded from the electronic universal experimental machine, utilize experimental provision to excite then and receive auspicious Leibo; Auspicious Leibo signal to receiving carries out signal Processing, promptly signal is added Hanning window and carries out Fast Fourier Transform (FFT), fundamental frequency amplitude A in the auspicious Leibo ultrasonic signal that obtains being received
1With frequency multiplication amplitude A
2After accomplishing above-mentioned test, again test specimen is stretched to the stress that once loads greater than preceding, and once more the test specimen that unloads from the electronic universal experimental machine is carried out same non-linear ultrasonic test, obtain ultrasound wave fundamental frequency and the frequency multiplication amplitude of test specimen behind this stress; Repeat above-mentioned steps, necking phenomenon occurs, take place till the intensity inefficacy up to test specimen; Definition is also adopted following relative nonlinear coefficient based on fundamental frequency and frequency multiplication amplitude: β
R=A
2/ A
1 2
Calculate the relative nonlinear factor beta of auspicious Leibo according to the formula following formula
R, the relative nonlinear coefficient when the note test specimen loads without stress is β
R0, test specimen is loaded the relative nonlinear factor beta behind the different stress
RDivided by β
R0Carry out regularization, obtain based on the regularization relative nonlinear coefficient of fundamental frequency, frequency multiplication and the graph of relation between stress;
4) the repeatability operation of test: piezoelectric sensor and the organic glass wedge that will excite and receive auspicious Leibo unload from test specimen fully to be removed; Clean out couplant; Complete then repeating step 1) work; Be about to the lithium niobate crystal chip transducer and be bonded on the organic glass wedge, utilize couplant that the organic glass wedge is sticked on metal plate-like test specimen surface then, excite and receive the auspicious thunder surface wave of certain intensity; Then repeating step 3 again) work in; Same test specimen, different stress is carried out exciting and receiving of auspicious Leibo signal after loading; Carry out 2-3 time repeated test,, can obtain existing the nonlinear factor of surface damage test specimen in various degree to guarantee the reliable and accurate of test result.
2. the nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage according to claim 1; It is characterized in that; In step 1): the ultrasonic signal that non-linear ultrasonic test macro main frame produces is that 10-16 cycle, frequency are the sine pulse string ultrasonic signal of 2MHz; After this signal carries out impedance matching, attenuator and low-pass filter through 50 ohm of terminals; Excitation is bonded in the lithium niobate crystal chip transducer on the organic glass wedge, and ultrasonic signal is in the auspicious Leibo of almag test specimen surface excitation.
3. the nonlinear ultrasonic evaluation method that utilizes auspicious Leibo to carry out the metal material surface damage according to claim 1; It is characterized in that; In step 1): utilize oscillograph that the signal that collects is carried out 525 times average; Improving the signal to noise ratio (S/N ratio) of auspicious Leibo signal, and effectively suppress stochastic factor in the test process; To the auspicious Leibo signal application Hanning window function after the multiple averaging, eliminate of the influence of instrument and equipment transient state process to measurement result.
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