CN107748205A - A kind of elastic constant measurement method varied with temperature - Google Patents
A kind of elastic constant measurement method varied with temperature Download PDFInfo
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- CN107748205A CN107748205A CN201711264422.XA CN201711264422A CN107748205A CN 107748205 A CN107748205 A CN 107748205A CN 201711264422 A CN201711264422 A CN 201711264422A CN 107748205 A CN107748205 A CN 107748205A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
Abstract
The invention discloses a kind of method for fast measuring of material at high temperature elastic constant：Pass through characteristic during the sound of ultrasonic echo, ultrasonic compressional and the relational expression of shear wave propagation speed and temperature in test specimen are obtained respectively, by the incidence relation between medium temperature ultrasonic propagation velocity elastic properties of materials constant three, the elastic constant under the conditions of material at high temperature can lossless, be rapidly measured, has the advantages that simple and convenient, the cycle is short, cost is low, applied widely.
Description
Technical field
The present invention relates to ultrasound detection field, relates in particular to a kind of elastic constant measurement method varied with temperature.
Background technology
The elastic constant part important as material mechanical performance, it is the important physical ginseng for characterizing elastic properties of materials performance
Number.At present, the measuring method of elastic properties of materials constant mainly has two kinds of static method and dynamic method.The former is mainly by way of stretching
The static mechanical property parameter of material is obtained, the problems such as measurement period length, the wasting of resources, big disturbance be present.The latter is divided into altogether again
Method of shaking and ultrasonic method, wherein resonance method measure according to the vibration characteristics of material, sample processing difficulties, the scope of application be present
Narrow, dependence artificial experience etc.；Ultrasonic method measures according to propagation characteristic, have it is simple and convenient, the cycle is short, cost is low, applicable
Widely studied and application has been obtained in the wide elastic properties of materials constant measurement under normal temperature condition of material ranges.
The elastic constant measurement that ultrasonic method is further used under hot conditions by the present invention, it is unique in that：By super
The feature measurement during sound of sound echo, obtain ultrasonic longitudinal wave and the relational expression of shear wave propagation speed and temperature respectively, by medium temperature-
Incidence relation between ultrasonic propagation velocity-elastic properties of materials constant three determines the elastic constant that material varies with temperature.
The content of the invention
It is an object of the invention to provide a kind of elastic constant measurement method varied with temperature, using ultrasonic pulse-echo method, obtain
The dependency relation formula of ultrasonic propagation velocity and temperature in test specimen is taken, by medium temperature-ultrasonic propagation velocity-elastic properties of materials
Relation between constant three, can it is lossless, rapidly measure condition of different temperatures under metal, composite material Equivalent Elasticity mould
The elastic constants such as amount, Poisson's ratio, modulus of shearing.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of elastic constant measurement method varied with temperature, comprises the following steps：
Step 1：A test specimen is processed, thickness of the test specimen along tested direction is more than a ultrasonic wavelength；
Step 2：Carry out being heated up to predetermined temperature to test specimen, by ultrasound method, be tested respectively
The propagation time t of ultrasonic wave compressional wave and shear wave in partLAnd ts；
Step 3：By high-temperature heat expansion effect, according to Light deformation measuring instrument measurement result amendment test specimen along tested
The thickness change in direction；
Step 4：The spread speed of ultrasonic wave compressional wave and shear wave in test specimen is obtained by calculating, expression formula is：VL=
2(L+△L)/tLAnd Vs=2 (L+ △ L)/ts；
Wherein：VLFor longitudinal wave velocity；VsFor transverse wave velocity；L is the thickness that test specimen is tested direction；
Step 5：According to Vocal cord injection,
The expression formula of modulus of elasticity is：
The expression formula of Poisson's ratio is：
The expression formula of modulus of shearing is：
Wherein：E is the modulus of elasticity of material；υ is Poisson's ratio；G is modulus of shearing.
Step 6：By the V in step 4LAnd VsBe updated in each expression formula in step 5, calculate test specimen with
The elastic properties of materials constant such as modulus of elasticity, Poisson's ratio and modulus of shearing of temperature change.
In the above-mentioned technical solutions, the heating of temperature is heated to predetermined temperature by room temperature in the step 2.
In the above-mentioned technical solutions, in heating process with 20 DEG C of interval for a temperature conditionss, and the quilt in heating process
Test block is in homogeneous temperature field.
In the above-mentioned technical solutions, the thickness change along tested direction in the step 3 is by expression formula △ L=α △
T is corrected, and wherein △ L are the variable quantity that test specimen is tested direction thickness, and α is the thermal coefficient of expansion of material, and △ T are temperature in test specimen
The variable quantity of degree.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
The present invention manages according to the ultrasound characteristic that propagation characteristic varies with temperature in media as well using thermoacoustic is theoretical with acoustic elasticity
By being combined, can quickly, it is easy, accurately measure warm elastic constant under the conditions of material at high temperature；Compared to existing material at high temperature
Elastic constant measurement, the present invention obviate the Mechanical loading measurement apparatus of complexity, add acoustic measurement apparatus；This aspect letter
Change measurement apparatus, operate relative ease, and measurement period can be effectively reduced；On the other hand, because acoustic equipment can be with non-
Contact type measurement, improve the antijamming capability of sensor resistance to elevated temperatures and temperature effect, can effectively be lifted temperature-measuring range and
Temperature measurement accuracy；When carrying out non-cpntact measurement based on electromagnetism or laser-ultrasound, material at high temperature elastic constant measurement is hardly sensed
The influence of device heat resistance, there is the advantages of measurement range is big.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Ultrasonic longitudinal wave/shear wave velocity that Fig. 1 is varied with temperature；
The elasticity modulus of materials that Fig. 2 is varied with temperature.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.
Technique according to the invention scheme and step carry out the implementation of concrete case, as follows：
Certain heat insulation material cuboid test specimen length × width × height=5cm × 5cm × 10cm, heated along short transverse bottom surface, its
Remaining surface is all adiabatic face.Ultrasonic probe is placed in upper surface, using vertical incidence mode excitation pulse ultrasonic wave, based on measurement bottom
The change in face echo propagation time.Every 20 DEG C of interval measurements, one temperature conditions, and be repeated 4 times, and take its average value to be used as and be somebody's turn to do
The propagation time of ultrasound in media as well under temperature conditionss.
By VL=2 (L+ △ L)/tL, obtain ultrasonic longitudinal wave and shear wave velocity respectively as shown in figure 1, can formula be expressed as：
VL=6111-0.6480 × T
VL=2911-0.631 × T
Bring above-mentioned two formula into modulus of elasticity expression formula, you can obtain the elastic properties of materials varied with temperature as shown in Figure 2
Modulus
The invention is not limited in foregoing embodiment.The present invention, which expands to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (1)
- A kind of 1. elastic constant measurement method varied with temperature, it is characterised in that comprise the following steps：Step 1：A test specimen is processed, thickness of the test specimen along tested direction is more than a ultrasonic wavelength；Step 2：Carry out being heated up to predetermined temperature to test specimen, by ultrasound method, obtain respectively in test specimen The propagation time t of ultrasonic wave compressional wave and shear waveLAnd ts；Step 3：By high-temperature heat expansion effect, according to Light deformation measuring instrument measurement result amendment test specimen along tested direction Thickness change；Step 4：The spread speed of ultrasonic wave compressional wave and shear wave in test specimen is obtained by calculating, expression formula is：VL=2 (L+ △L)/tLAnd Vs=2 (L+ △ L)/ts；Wherein：VLFor longitudinal wave velocity；VsFor transverse wave velocity；L is the thickness that test specimen is tested direction；Step 5：According to Vocal cord injection,The expression formula of modulus of elasticity is：The expression formula of Poisson's ratio is：The expression formula of modulus of shearing is：Wherein：E is the modulus of elasticity of material；υ is Poisson's ratio；G is modulus of shearing；Step 6：By the V in step 4LAnd VsIt is updated in each expression formula in step 5, calculates test specimen with temperature The elastic properties of materials constant such as modulus of elasticity, Poisson's ratio and modulus of shearing of change.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487908A (en) * | 2019-07-24 | 2019-11-22 | 大连理工大学 | A kind of elastic constant measurement method based on array magnet electromagnetic ultrasound |
| CN113295770A (en) * | 2021-05-26 | 2021-08-24 | 中北大学 | Device and method for measuring Curie temperature point of ferromagnetic material based on electromagnetic ultrasound |
| CN113686275A (en) * | 2021-07-14 | 2021-11-23 | 中国特种设备检测研究院 | Method for ultrasonic thickness measurement based on waveguide rod |
| WO2022267072A1 (en) * | 2021-06-25 | 2022-12-29 | 临海伟星新型建材有限公司 | Nondestructive variable-temperature testing apparatus and method for mechanical properties of materials |
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| CN110487908A (en) * | 2019-07-24 | 2019-11-22 | 大连理工大学 | A kind of elastic constant measurement method based on array magnet electromagnetic ultrasound |
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| CN113295770B (en) * | 2021-05-26 | 2024-02-09 | 中北大学 | Device and method for measuring Curie temperature point of ferromagnetic material based on electromagnetic ultrasonic |
| WO2022267072A1 (en) * | 2021-06-25 | 2022-12-29 | 临海伟星新型建材有限公司 | Nondestructive variable-temperature testing apparatus and method for mechanical properties of materials |
| CN113686275A (en) * | 2021-07-14 | 2021-11-23 | 中国特种设备检测研究院 | Method for ultrasonic thickness measurement based on waveguide rod |
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