CN109029840A - A kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method - Google Patents
A kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method Download PDFInfo
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- CN109029840A CN109029840A CN201811022738.2A CN201811022738A CN109029840A CN 109029840 A CN109029840 A CN 109029840A CN 201811022738 A CN201811022738 A CN 201811022738A CN 109029840 A CN109029840 A CN 109029840A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
Abstract
The present invention relates to explosive sonoelastic coefficient detection fields, and in particular to a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method.The sonoelastic coefficient of standard sample is demarcated first, make a load-sound time difference calibration curve, in the subsequent progress residual stress measurement to explosive, its sound time difference only need to be measured, calibration curve can be corresponded to and learn its load (as residual stress).Using the sound time difference-curve of load for the standard sample that this method measures, Linear Quasi is right good, and the explosive residual stress measured is accurate.
Description
Technical field
The present invention relates to explosive residual stress detection fields, and in particular to a kind of explosive residual stress supersonic testing method sound bullet
Coefficient scaling method.
Background technique
Plastic bonded explosive (Polymer Bonded Explosives, abbreviation PBX), be by high energy single chmical compound explosive and
The important high explosive of one kind of the compositions such as high polymer adhesive.PBX be it is hot-forming by modeling powder, in forming process because
Ambient pressure effect occurs different degrees of elastic-plastic deformation, can put aside certain elastic strain energy after pressure removal, generates remaining
Stress, it may be said that residual stress is a kind of invisible defect in PBX.However, PBX is in use by rings such as temperature, stress
Border factor influences significantly, sensitive compared with strong stimulation to the external world, therefore, carries out plastic bonded explosive residual stress test and characterization has
There is important theoretical realistic meaning.
Since there are safety issues for PBX residual stress test, lossless physical measure is generally used, application at present is most
It is widely X-ray diffraction method.But X-ray penetration capacity is limited, can only measure the stress of several micron thickness in sample surface layer；And
There are radiation, long period of operation personnel have the risk there are occupational disease.Compared with X ray diffraction method, ultrasonic measurement has precision
Height, fathom big, high accuracy for examination, and measurement method is simple, can be with field work.
When using ultrasound checking PBX explosive residual stress, need first to carry out acoustic elasticity system to PBX explosive standard sample
A load-sound time difference calibration curve is made in several calibration, surveys in the subsequent PBX explosive to identical sonoelastic coefficient
When amount, its sound time difference only need to be measured, calibration curve can be corresponded to and learn its load (as residual stress).But since explosive tries
The particularity of sample, the factors such as step sequence, calculation method in calibration process the curve of calibration is influenced it is very big, at present to standard
The calibration of sample sonoelastic coefficient still needs to improve.
Summary of the invention
To solve the above problems, the present invention provides a kind of explosive residual stress supersonic testing method sound bullet coefficient calibration sides
Method is implemented with the following technical solutions:
A kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method is tried using ultrasonic stress gauge and digital material
Machine is tested, specifically includes the following steps:
Step 1: ultrasonic stress gauge and digital Material Testing Machine being opened, preheated；
Step 2: the both ends of standard sample length direction being fixed on the clamping jaw of digital material testing machine, in standard sample
Uniform daubing coupling agent is divided a pair of of ultrasonic probe using probe gripper as measured zone on the intermediate surface position of two sides
It is not fitted in the measured zone of standard sample two sides, the standard sample is that there is no the sample of internal stress, described two ultrasounds
Wave visits first for emitting ultrasonic signal, and one for receiving ultrasonic signal；
Step 3: applying certain load to ultrasonic probe is close to it with standard sample, and the load is no more than super
The stress measurement resolution ratio of sound stress gauge；
Step 4: tensile compression test at least once being done to standard sample, the basic map to get standard samples determines it
Regime of elastic deformation；
Step 5: two ultrasonic probes have sharp interface wave to penetrating, and can measure the velocity of sound of measurand
In formula: CsFor the test specimen velocity of sound, δ is test specimen geometric thickness, tsFor the primary bottom wave of test specimen, t0For receiving transducer sound
With block surface wave；
Standard sample sound velocity determination is carried out, using sonic velocity change rate and applies calibration load acquisition sonoelastic coefficient Kσ, sound
Coefficient of elasticity KσIt is to apply and demarcate load σF, load front and back sonic velocity change Δ C and test specimen velocity of sound CsFor the function of variable:
In formula, σFLoad is demarcated to apply, Δ C is the sonic velocity change of load front and back；
The expression formula of load calibration load are as follows:
In formula: σFFor the load that calibration applies, Δ C is the sonic velocity change of load front and back, and b ' is constant；
This calibration mode, the velocity of sound is unrelated with the absolute velocity of sound of test specimen itself, seeks inverse function
Step 6: according to step 1-5, measuring the sonoelastic coefficient of reliable standard sample；
Step 7: detecting the internal residual stress of test sample, the sonoelastic coefficient base of the test sample and standard sample
This is identical, and detecting step is as follows:
S7-1, the both ends of test sample length direction are fixed on the clamping jaw of digital material testing machine, in standard sample
Uniform daubing coupling agent is divided a pair of of ultrasonic probe using probe gripper as measured zone on the intermediate surface position of two sides
It is not fitted in the measured zone of standard sample two sides, described two ultrasonic probes one for emitting ultrasonic signal, a use
In reception ultrasonic signal；
S7-2, apply certain load to ultrasonic probe and be close to it with standard sample, the load is no more than super
The resolution ratio of sound stress gauge；
Longitudinal wave evaluates and tests carrier as residual stress in S7-3, selection test sample body, starts ultrasonic stress gauge, to ultrasonic wave
After signal transmitting and receiving is normal, starts constant load pulling force in test specimen two ends and apply load, the load applied to test sample should ensure that
In the regime of elastic deformation measured in step 4, successively the measurement sound time difference and calibration is executed automatically using ultrasonic stress gauge；
S7-4, the residual stress that test sample is calculated according to step 5, calculation method are as follows:
It enablesThe expression formula of so residual stress test is
Wherein,
In formula, tσApply the transition time (TOF) when stress, t for test samplesdWhen not applying stress for test sample
Transition time (TOF).
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, step 1~7 need to keep temperature permanent
It is fixed.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, among step 5 and step 6 also
Static retest, static retest include that zero load is tested and with load test:
Zero load test method is after sonoelastic coefficient calibration, still probe to be kept to be fixed on test specimen, utilized
Calibrated sonoelastic coefficient, progress follow-on test is multiple, observes the fluctuation of strain measurements, ultrasonic stress gauge records load in real time
The undulating value of lotus；
Band load testing method is after coefficient of elasticity calibration, still probe to be kept to be fixed on test specimen, by load
The half for demarcating full and down used is added to, using calibrated sonoelastic coefficient, progress follow-on test is multiple, observes stress measurement
The fluctuation of value, ultrasonic stress gauge record the undulating value of load in real time.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, among step 5 and step 6 also
Single-point reset test is multiple, detect and record probe from the measured zone on contact standard sample terminate to measurement state be
No stabilization, each single-point reset test are a complete band load test process.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, couplant in step 2 is water, sweet
Oily, dedicated ultrasonic coupling agent, machine oil, waterglass, chemical paste be one such or any combination.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, the couplant in step 2 needs timing
Supply, supply mode are spray or immersion type.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, standard sample and survey in step 2
Test agent is dumbbell specimen.
Standard sample, test in above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, in step 2
The material of sample is plastic bonded explosive.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, the stepping accuracy of measurement of puller system is not low
In 0.5MPa.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, zero load testing time is 300-
800 times, band load test number is 300-800 times.
The invention has the following advantages that
One, the sonoelastic coefficient using the standard sample of this method calibration is accurate, and the sound time difference-curve of load Linear Quasi is right
Good, the explosive residual stress measured is accurate.
Two, tensile compression test at least once is done to standard sample, the basic map to get standard samples determines its elasticity
Deformation range, the calibration of sound bullet coefficient carry out within the scope of elastic properties of materials, and after material is plastically deformed, material inside organization is
It is no longer original texture, therefore lose meaning through changing.Therefore before calibration sound bullet coefficient, a tension and compression should first be done
Test, obtains the basic map of material, determines elastic range.
Three, static retest, it may be verified that whether the operating status of instrument itself meets test request；Zero load test has
Two purposes: 1) the dead load ability of digital material testing machine itself is verified, since PBX explosive itself is to the resolution ratio of stress measurement
More demanding, this just protects loading capability (the fluctuation model of permanent load within a certain period of time to the digital material testing machine of actual use
Enclose) it proposes to compare high request, if strain measurements are protected with digital Material Testing Machine when carrying, fluctuation tendency is consistent, needs to consider sound bullet
The amendment of coefficient, then sound bullet coefficient calibration result is more satisfactory, can not correct direct use if fluctuation is unobvious.2) instrument
From in determine load test when repeatability.
Four, before single-point reset test can verify that probe terminates from contact measurement region to measurement, probe in this period
And whether attachment tooling etc. is reliable and stable (being substantially the comprehensive state of coupling and channel).
Five, couplant is so that ultrasonic energy is effectively penetrated workpiece for excluding the air between probe and testee
Reach testing goal.If selecting type or application method improper, error or coupling mark flashing will be caused, is unable to measure.Cause
Suitable type is selected according to service condition, when use is in smooth material surface, the couplant of low viscosity can be used；When making
When used in rough surface, vertical surface and top surface, the high couplant of viscosity should be used.High temperature workpiece should select high temperature to couple
Agent.Secondly, couplant should use in right amount, smear uniformly, couplant should be generally coated in the surface of measured material, but when measurement temperature
When spending higher, couplant should be coated on probe.
Six, calibration process needs certain time, PBX water absorption character if it exists, is necessary to ensure that couplant has in calibration process
Timing is fed, it is proposed that using spray ultrasonic probe or uses immersion type mode.
Seven, by standard sample and explosive sample design at dumbbell-shaped specimen, in test, sample both ends are tried by digital material
The fixture for testing machine is held on to, and the effect that can avoid this clamping generates additional stress to sample and interferes sample authenticity energy
Measurement.
Eight, instrument being preheated before calibration, temperature can be gradually increasing after instrument starting, until reach an equilibrium temperature,
Although level-one temperature compensation function built in instrument, temperature rise is very fast after ultrasonic stress gauge enables frequency doubling technology, and PBX is organic again
Material is expanded with heat and contract with cold obvious, and can the level-one temperature compensation function of standard wouldn't define and follow PBX to the sound of temperature in time
Answer characteristic (specific temperature compensation coefficient is wanted in second level temperature-compensating).Before indefinite PBX temperature compensation coefficient, by instrument
Preheating is to ensure that the simple approach of precision.Temperature in addition, ensure that environment temperature is constant in calibration, and when ensuring actual test
Temperature when degree must and be demarcated is consistent, it is ensured that the accuracy of data measured.
Specific embodiment
It is right below in conjunction with the embodiment of the present invention in order to make those skilled in the art better understand the present invention program
Technical solution of the present invention carries out clear, complete description.
A kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method is tried using ultrasonic stress gauge and digital material
Machine is tested, digital material testing machine has good guarantor's loading capability (it is constant to keep constant load within a certain period of time), specific to wrap
Include following steps:
Step 1: ultrasonic stress gauge and digital Material Testing Machine being opened into 30min and preheated；It is before calibration that instrument is pre-
Heat, temperature can be gradually increasing after instrument starting, until reaching an equilibrium temperature, although level-one temperature-compensating function built in instrument
Can, but temperature rise is very fast after ultrasonic stress gauge enables frequency doubling technology, and PBX is organic material again, it expands with heat and contract with cold obvious, standard
Level-one temperature compensation function wouldn't define and can follow response characteristic of the PBX to temperature in time (second level temperature-compensating wants bright
True temperature compensation coefficient).Before indefinite PBX temperature compensation coefficient, instrument preheating is to ensure that simply doing for precision
Method.In addition, ensuring that environment temperature is constant in calibration, and ensure that temperature when actual test must be protected with temperature when calibration
It holds consistent, it is ensured that the accuracy of data measured.
Step 2: the both ends of standard sample length direction being fixed on the clamping jaw of digital material testing machine, in standard sample
Uniform daubing coupling agent is divided a pair of of ultrasonic probe using probe gripper as measured zone on the intermediate surface position of two sides
It is not fitted in the measured zone of standard sample two sides, standard sample is that there is no the sample of internal stress, two ultrasonic probes one
A to be used to emit ultrasonic signal, one for receiving ultrasonic signal；
Step 3: applying certain load to ultrasonic probe is close to it with standard sample, and load is answered no more than ultrasound
The stress measurement resolution ratio of power instrument；
Step 4: a tensile compression test being done to standard sample, the basic map to get standard samples determines its elasticity
Deformation range；The calibration of sound bullet coefficient carries out within the scope of elastic properties of materials, and after material is plastically deformed, material inside organization is
It is no longer original texture, therefore lose meaning through changing.Therefore before calibration sound bullet coefficient, a tension and compression should first be done
Test, obtains the basic map of material, determines elastic range.
Step 5:
S5-1, two ultrasonic probes have sharp interface wave, can measure the velocity of sound of measurand to penetrating
In formula: CsFor the test specimen velocity of sound, δ is test specimen geometric thickness, tsFor the primary bottom wave of test specimen, t0For receiving transducer sound
With block surface wave；
S5-2, standard sample sound velocity determination is carried out, using sonic velocity change rate and applies calibration load acquisition sonoelastic coefficient
Kσ, sonoelastic coefficient KσIt is to apply and demarcate load σF, load front and back sonic velocity change Δ C and test specimen velocity of sound CsFor the letter of variable
Number:
In formula, σFLoad is demarcated to apply, Δ C is the sonic velocity change of load front and back；
The expression formula of load calibration load are as follows:
In formula: σFFor the load that calibration applies, Δ C is the sonic velocity change of load front and back, and b ' is constant；
This calibration mode, the velocity of sound is unrelated with the absolute velocity of sound of test specimen itself, seeks inverse function
S5-3, static retest is carried out, static retest includes that zero load is tested and with load test: zero load is surveyed
Method for testing is after coefficient of elasticity calibration, still probe to be kept to be fixed on test specimen, utilize calibrated acoustic elasticity system
Number carries out follow-on test 500 times, observes the fluctuation of strain measurements, ultrasonic stress gauge records the undulating value of load in real time；Band carries
Lotus test method is after coefficient of elasticity calibration, still probe to be kept to be fixed on test specimen, load is added to used in calibration
The half of full and down carries out follow-on test 500 times using calibrated sonoelastic coefficient, observes the fluctuation of strain measurements, surpasses
Sound stress gauge records the undulating value of load in real time.Static retest, it may be verified that whether the operating status of instrument itself meets survey
Examination requires；There are two purposes for zero load test: 1) the dead load ability of digital material testing machine itself is verified, due to PBX explosive sheet
Body is higher to the resolution requirement of stress measurement, this just protects loading capability (permanent load to the digital material testing machine of actual use
Fluctuation range within a certain period of time) it proposes to compare high request, if strain measurements and digital Material Testing Machine are protected and are fluctuated when carrying
Trend is consistent, needs to consider the amendment of sound bullet coefficient, if fluctuation is unobvious, then sound bullet coefficient calibration result is more satisfactory, it can
Direct use is not corrected.2) instrument is from repeatability when determining load test.
S5-4, it carries out single-point reset test 5 times, detect and records probe from the measured zone on contact standard sample to survey
Whether stable measure state between terminating, each single-point reset test is a complete band load test process.Single-point resets
Before test can verify that probe terminates from contact measurement region to measurement, whether probe and attachment tooling etc. are stable in this period
Reliably (being substantially the comprehensive state of coupling and channel).
Step 6: according to step 1-5, measuring the sonoelastic coefficient of reliable standard sample；
Step 7: detecting the internal residual stress of test sample, the basic phase of sonoelastic coefficient of test sample and standard sample
Together, detecting step is as follows:
S7-1, the both ends of test sample length direction are fixed on the clamping jaw of digital material testing machine, in standard sample
Uniform daubing coupling agent is divided a pair of of ultrasonic probe using probe gripper as measured zone on the intermediate surface position of two sides
It is not fitted in the measured zone of standard sample two sides, two ultrasonic probe one is used to emit ultrasonic signal, and one for connecing
Receive ultrasonic signal；
S7-2, apply certain load to ultrasonic probe and be close to it with standard sample, load is answered no more than ultrasound
The resolution ratio of power instrument；
Longitudinal wave evaluates and tests carrier as residual stress in S7-3, selection test sample body, starts ultrasonic stress gauge, to ultrasonic wave
After signal transmitting and receiving is normal, starts constant load pulling force in test specimen two ends and apply load, the load applied to test sample should ensure that
In the regime of elastic deformation measured in step 4, successively the measurement sound time difference and calibration is executed automatically using ultrasonic stress gauge；
S7-4, the residual stress that test sample is calculated according to step 5, calculation method are as follows:
It enablesThe expression formula of so residual stress test is
Wherein,
In formula, tσApply the transition time (TOF) when stress, t for test samplesdWhen not applying stress for test sample
Transition time (TOF).
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, step 1~7 need to keep temperature permanent
It is fixed.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, couplant in step 2 is water, sweet
Oily, dedicated ultrasonic coupling agent, machine oil, waterglass, chemical paste be one such or any combination.Couplant is for excluding to visit
Air between head and testee, makes ultrasonic energy effectively penetrate workpiece and reaches testing goal.If selection type makes
It is improper with method, error or coupling mark flashing will be caused, is unable to measure.Because selecting suitable type according to service condition, when
Use the couplant that low viscosity in smooth material surface, can be used；When use is in rough surface, vertical surface and top surface
When, the high couplant of viscosity should be used.High temperature workpiece should select high-temperature coupling agent.Secondly, couplant should use in right amount, smear equal
It is even, couplant should be generally coated in the surface of measured material, but when measurement temperature is higher, couplant should be coated on probe.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, the couplant in step 2 needs timing
Supply, supply mode are spray or water logging.Calibration process needs certain time, PBX water absorption character if it exists, needs in calibration process
Ensure that couplant has timing to feed, it is proposed that using spray ultrasonic probe or use immersion type mode.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, standard sample and survey in step 2
Test agent is dumbbell specimen.By standard sample and explosive sample design at dumbbell-shaped specimen, in test, sample both ends are counted
The fixture of word Material Testing Machine is held on to, and the effect that can avoid this clamping generates additional stress to sample and interferes sample true
The measurement of real performance.
Standard sample, test in above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, in step 2
The material of sample is plastic bonded explosive.
In above-mentioned explosive residual stress supersonic testing method sound bullet coefficient scaling method, the stepping-in amount of digital material testing machine
Precision is not less than 0.5MPa.
The above is a preferred embodiment of the present invention, does not depart from this hair for those of ordinary skill in the art
Under the premise of bright principle, several variations and modifications can also be made, these also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method, which is characterized in that using ultrasonic stress gauge and
Digital material testing machine, specifically includes the following steps:
Step 1: ultrasonic stress gauge and digital Material Testing Machine being opened, preheated；
Step 2: the both ends of standard sample length direction being fixed on the clamping jaw of digital material testing machine, in standard sample two sides
Intermediate surface position on uniformly daubing coupling agent as measured zone, a pair of of ultrasonic probe is pasted respectively using probe gripper
The measured zone in standard sample two sides is closed, the standard sample is there is no the sample of internal stress, and described two ultrasonic waves are visited
First is for emitting ultrasonic signal, and one for receiving ultrasonic signal；
Step 3: applying certain load to ultrasonic probe is close to it with standard sample, and the load is no more than instrument
Stress measurement resolution ratio；
Step 4: tensile compression test at least once being done to standard sample, the basic map to get standard samples determines its elasticity
Deformation range；
Step 5: two ultrasonic probes have sharp interface wave to penetrating, and can measure the velocity of sound of measurand
In formula: CsFor the test specimen velocity of sound, δ is test specimen geometric thickness, tsFor the primary bottom wave of test specimen, t0For receiving transducer acoustic matching block
Surface wave；
Standard sample sound velocity determination is carried out, using sonic velocity change rate and applies calibration load acquisition sonoelastic coefficient Kσ, the sound bullet
Property coefficient KσIt is unrelated with acoustic velocity of material:
In formula, σFLoad is demarcated to apply, Δ C is the sonic velocity change of load front and back,
The expression formula of load calibration load are as follows:
In formula: σFFor the load that calibration applies, Δ C is the sonic velocity change of load front and back；
This calibration mode, the velocity of sound is unrelated with the absolute velocity of sound of test specimen itself, seeks inverse function
Step 6: according to step 1-5, measuring the sonoelastic coefficient of reliable standard sample；
Step 7: the internal residual stress of test sample is detected, detecting step is as follows:
S7-1, the both ends of test sample length direction are fixed on the clamping jaw of digital material testing machine, in standard sample two sides
Intermediate surface position on uniformly daubing coupling agent as measured zone, a pair of of ultrasonic probe is pasted respectively using probe gripper
The measured zone in standard sample two sides is closed, described two ultrasonic probes one is used to emit ultrasonic signal, and one for connecing
Receive ultrasonic signal；
S7-2, apply certain load to ultrasonic probe and be close to it with standard sample, the load is answered no more than ultrasound
The resolution ratio of power instrument；
Longitudinal wave evaluates and tests carrier as residual stress in S7-3, selection test sample body, starts ultrasonic stress gauge and triggers ultrasonic signal,
After ultrasonic signal transmitting-receiving is normal, starts constant load pulling force in test specimen two ends and apply load, the load that test sample is applied
Lotus should ensure that in the regime of elastic deformation measured in step 4, successively the measurement sound time difference and be executed automatically using ultrasonic stress gauge
Calibration；
S7-4, the residual stress that test sample is calculated according to step 5, calculation method are as follows:
It enablesThe expression formula of so residual stress test is
Wherein,
In formula, tσApply the transition time (TOF) when stress, t for test samplesdGetting over when not applying stress for test sample
Time (TOF).
2. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In step 1~7 need to keep temperature constant.
3. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In there are also static retest among the step 5 and step 6, static retest includes zero load test and surveys with load
Examination:
Zero load test method is, after coefficient of elasticity calibration, still probe is kept to be fixed on test specimen, using having demarcated
Sonoelastic coefficient, carry out follow-on test it is multiple, observe the fluctuation of strain measurements, ultrasonic stress gauge records the wave of load in real time
Dynamic value；
Band load testing method is after coefficient of elasticity calibration, still probe to be kept to be fixed on test specimen, load is added to
The half for demarcating full and down used, using calibrated sonoelastic coefficient, progress follow-on test is multiple, observes strain measurements
Fluctuation, ultrasonic stress gauge record the undulating value of load in real time.
4. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In, it is multiple there are also single-point reset test among the step 5 and step 6, it detects and records probe from contact standard sample
Measured zone to measurement terminate between state it is whether stable, each single-point reset test is a complete band load test mistake
Journey.
5. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
It is that water, glycerol, dedicated ultrasonic coupling agent, machine oil, waterglass, chemical paste are one such in, couplant in the step 2
Or any combination.
6. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In the couplant in the step 2 needs timing to feed, and supply mode is fountain or immersion type.
7. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In standard sample and test sample in the step 2 are dumbbell specimen.
8. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In the material of standard sample, test sample in the step 2 is plastic bonded explosive.
9. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 1, feature exist
In the stepping accuracy of measurement of the puller system is not less than 0.5MPa.
10. a kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method according to claim 3, feature exist
In the zero load testing time is 300-800 times, and band load test number is 300-800 times.
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| CN114964617B (en) * | 2022-05-30 | 2024-04-02 | 国家石油天然气管网集团有限公司 | Calibration method for comprehensive stress detection equipment of long oil and gas pipeline |
| CN114910203A (en) * | 2022-06-21 | 2022-08-16 | 武汉大学 | Material surface stress detection method based on laser synchronous induction ultrasonic surface wave and air wave |
| CN114910203B (en) * | 2022-06-21 | 2023-01-17 | 武汉大学 | Material surface stress detection method based on laser synchronous induction ultrasonic surface wave and air wave |
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