Ultrasonic measurement method for internal temperature of composite material based on envelope area

Abstract

The invention discloses an envelope area-based ultrasonic measurement method for the internal temperature of a composite material, which belongs to the field of ultrasonic non-destructive detection and comprises the following steps of: exciting ultrasonic waves above the composite material and receiving a reflection echo signal at an excitation position; receiving an ultrasonic echo signal, and taking an upper envelope line; carrying out peak value analysis on the echo envelope in the upper envelope line and taking an integral value of the area of the echo envelope; echo envelope peak value integral areas at different temperatures are obtained; fitting the temperature with the peak integral area of the envelope on the ultrasonic echo to obtain an incidence relation between the temperature and the envelope area; and during subsequent temperature measurement characterization, after the peak value area is obtained, substituting the peak value area into the incidence relation to obtain the temperature measurement characterization in the composite material at the temperature. According to the invention, measurement characterization of the internal temperature of the composite material structure is realized, so that the most accurate reference data and evaluation basis are provided for safety evaluation of the structure.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic non-destructive detection, and more specifically, to an ultrasonic measurement method for the internal temperature of composite materials based on envelope area. Background Art

[0002] Composite materials are materials formed by combining two or more components with different physical or chemical properties through physical or chemical methods. They usually have excellent properties such as high strength, high modulus, and high temperature resistance, and are thus widely used in the fields of aerospace, automotive, electronics, etc. For the structure of composite materials, the internal temperature change characteristics play a crucial role in thermal safety assessment. Ultrasonic temperature measurement technology has become an effective means to evaluate the internal temperature distribution and change of composite materials because it can achieve non-destructive and on-line measurement.

[0003] Traditional ultrasonic temperature measurement methods require the material to be measured to be a homogeneous material (pure metal, stainless steel, etc.), and the echo travel time of ultrasonic waves needs to be extracted to measure its internal temperature. For most non-homogeneous composite materials, the internal material composition and structure are complex, and the echo signals are relatively disordered, resulting in the inability to extract the travel time. At this time, other acoustic sensitive quantities need to be considered to characterize the internal temperature of the structure. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an ultrasonic measurement method for the internal temperature of composite materials based on envelope area. By designing a new ultrasonic temperature measurement method for the interior of composite materials, the measurement and characterization of the internal temperature of the composite material structure are realized, thereby providing the most accurate reference data and evaluation basis for the safety assessment of the structure.

[0005] The purpose of the present invention is achieved through the following solutions: An ultrasonic measurement method for the internal temperature of composite materials based on envelope area, comprising the following steps: Step (1), exciting ultrasonic waves above the composite material and receiving the reflected echo signal at the excitation position; Step (2), receiving the ultrasonic echo signal and taking the upper envelope of the ultrasonic echo waveform; Step (3), performing peak analysis on the first, second, and third echo upper envelopes in the upper envelope and taking the integral value of their areas; Step (4), at different temperatures, repeating Step (1) to obtain a series of ultrasonic echo signals, and obtaining the peak integral area of the ultrasonic echo upper envelope at different temperatures according to Steps (2) to (3); Step (5), fitting the temperature with the peak integral area of the ultrasonic echo upper envelope to obtain the correlation relationship S-T between the temperature and the envelope area; Step (6): When measuring and characterizing the internal temperature of the composite material subsequently, measure the ultrasonic echo signal in the composite material at a certain temperature, take the upper envelope, obtain the peak area S, and substitute it into S-T to obtain the temperature in the composite material at this temperature.

[0006] Further, in step (1), the composite material is in a high-temperature environment.

[0007] Further, in step (2), the received ultrasonic echo signal is the ultrasonic echo signal under the comprehensive influence of the anisotropy and temperature of the composite material.

[0008] Further, in step (3), the size of the area reflects the influence brought by temperature.

[0009] Further, the composite material includes a superalloy-based ceramic particle-reinforced composite material Ta10W / SiC.

[0010] Further, in Ta10W / SiC, the matrix is Ta10W, the material of the reinforcing particles is SiC, the SiC particles are circular, and the particle size is between 10 and 110 μm.

[0011] The beneficial effects of the present invention include: The method of the present invention aims at the requirement of measuring the internal temperature of the structure of the composite material, getting rid of the traditional method of extracting the ultrasonic propagation time (acoustic time) for measuring the internal temperature of the structure, but proposing a method for characterizing the internal temperature of the composite material based on the envelope area of the ultrasonic signal based on ultrasonic detection. This method can realize the quantitative characterization and measurement of the internal temperature of the composite material. This method is applicable to the temperature measurement of typical composite materials commonly used in engineering such as particle-reinforced composite materials and fiber-reinforced composite materials. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 Schematic diagram for exciting ultrasonic waves in the composite material; Figure 2 Schematic diagram of the received echo signal and the upper envelope of the echo signal; Figure 3 Schematic diagram of the integration of the peak area of the upper envelope of the echo signal; Figure 4Schematic diagram of exciting ultrasonic waves above the Ta10W / SiC particle-reinforced composite material; Figure 5 Graph showing the relationship between temperature and the integral area of the peak of the upper envelope of the echo at different temperatures. Specific implementation manner

[0014] All features disclosed in all embodiments in this specification, or all steps in any disclosed methods or processes implicitly, except for mutually exclusive features and / or steps, can be combined and / or extended, replaced in any manner.

[0015] The specific implementation process of the present invention is as follows: The core concept of the present invention is to use the integral area of the peak of the upper envelope of the echo signal as a sensitive quantity to achieve temperature measurement inside the composite material, and at the same time quantitatively characterize the comprehensive effect brought by "temperature and composite degree of the composite material" to ultrasonic wave propagation from the perspective of the ultrasonic wave waveform. In a specific embodiment, the method of the present invention aims at the temperature measurement requirement inside the structure of the composite material, and proposes a method for characterizing the temperature inside the composite material based on the envelope area of the ultrasonic signal based on ultrasonic detection. This method can realize quantitative characterization measurement of the temperature inside the composite material and is applicable to temperature measurement of common composite materials in typical projects such as particle-reinforced composite materials and fiber-reinforced composite materials.

[0016] Furthermore, in a preferred embodiment, the present invention specifically provides an ultrasonic measurement method for the temperature inside the composite material based on the envelope area, including the following steps: Step (1), as Figure 1 shown, exciting ultrasonic waves above the composite material in a high-temperature environment and receiving the reflected echo signal at the excitation position.

[0017] Step (2), as Figure 2 shown, receiving the ultrasonic echo signal affected by temperature. Considering that the upper envelope usually refers to the upper half of the envelope line of the signal waveform and can be used for analyzing and processing modulated signals to help identify the change trend of the signal. Therefore, take the upper envelope line of the ultrasonic echo waveform.

[0018] Step (3), as Figure 3 shown, performing peak analysis on the first, second, and third echo upper envelopes in the upper envelope line and taking the integral value of their areas. The size of the area reflects the influence brought by temperature. Among them, the parts circled by the dotted lines respectively represent the first, second, and third echoes, that is, the 1st echo, 2nd echo, and 3rd echo, and the blackened parts in the dotted lines are the peak integrals of the upper envelope.

[0019] Step (4), at different temperatures, repeat Step (1) to obtain a series of ultrasonic echo signals, and obtain the peak integral area of the ultrasonic echo envelope at different temperatures according to Steps (2)-(3).

[0020] Step (5), fit the temperature with the peak integral area of the upper envelope of the ultrasonic echo to obtain the correlation relationship S-T between the temperature and the envelope area.

[0021] Step (6), when measuring and characterizing the internal temperature of the composite material subsequently, measure the ultrasonic echo signal in the composite material at a certain temperature, take the upper envelope to obtain the peak area S, and substitute it into S-T to obtain the temperature in the composite material at this temperature.

[0022] In other embodiments of the present invention, the following steps are performed: As Figure 4 shown, select the superalloy-based ceramic particle-reinforced composite Ta10W / SiC as the research object, the matrix is Ta10W, and the material of the reinforcing particles is SiC. Establish a two-dimensional model with a length of 30 mm and a height of 10 mm in the COMSOL multi-physics simulation platform. The SiC particles are circular. To be closer to the engineering reality, the particle sizes are different from 10 to 110 μm, and the positions and sizes are randomly generated by a random function. The SiC particles are evenly distributed in the 30×10 mm area, and the number is 180, without agglomeration.

[0023] Under the uniform temperature field conditions of 25°C, 100°C, 200°C, 300°C, 400°C, and 500°C respectively, numerically simulate the propagation process of ultrasonic waves in the Ta10W / SiC composite material to obtain the echo waveform signal, and then perform signal and data processing according to Steps (2)-(5) of the method of the present invention. Finally, obtain the total peak integral area of the upper envelopes of the first to third echoes at different temperatures. The results are shown in Table 1. At the same time, obtain the correlation relationship between the temperature and the peak integral area of the upper envelope of the ultrasonic echo, as Figure 5 shown in Equations (1) and (2).

[0024] Table 1 Variation table of the peak integral area of the upper envelope of the ultrasonic wave signal with temperature

[0025] S = -0.009 T 2 -4.19 T +10866.46 (R 2 =0.98) (1); S = -9.07 T +11268.30 (R 2= 0.96)(2); where T is the temperature, and R 2 is the goodness of fit of the square fitting.

[0026] In subsequent temperature measurement characterization, the ultrasonic echo signal in the Ta10W / SiC composite material at a certain temperature and degree of polymerization is measured, the upper envelope is taken to obtain the peak area S, and substituting it into Equation (1) or Equation (2) can obtain the temperature value in the composite material.

[0027] The units involved in the embodiments of the present invention can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not constitute a limitation to the unit itself in some cases.

[0028] According to one aspect of the embodiments of the present invention, there is provided a computer program product or a computer program, the computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the above various alternative implementation manners.

[0029] As another aspect, the embodiments of the present invention further provide a computer-readable medium, which may be included in the electronic device described in the above embodiments; or may exist alone without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the one or more programs are executed by an electronic device, the electronic device implements the methods described in the above embodiments.

Claims

1. An ultrasonic measurement method for the internal temperature of a composite material based on the envelope area, characterized in that It includes the following steps: Step (1): Excite ultrasonic waves above the composite material and receive the reflected echo signals at the excitation position; Step (2): Receive the ultrasonic echo signals and take the upper envelope of the ultrasonic echo waveforms; Step (3): Conduct peak analysis on the first, second, and third echo upper envelopes in the upper envelope and take the integral value of their areas; Step (4): At different temperatures, repeat Step (1) to obtain a series of ultrasonic echo signals, and obtain the peak integral areas of the ultrasonic echo upper envelopes at different temperatures according to Steps (2) to (3); Step (5): Fit the temperature with the peak integral area of the ultrasonic echo upper envelope to obtain the correlation relationship S-T between the temperature and the envelope area; Step (6): During subsequent internal temperature measurement and characterization of the composite material, measure the ultrasonic echo signals in the composite material at a certain temperature, take the upper envelope to obtain the peak area S, and substitute it into S-T to obtain the temperature in the composite material at this temperature.

2. The ultrasonic measurement method for the internal temperature of a composite material based on the envelope area according to claim 1, characterized in that, In Step (1), the composite material is in a high-temperature environment.

3. The ultrasonic measurement method for the internal temperature of a composite material based on the envelope area according to claim 1, characterized in that In Step (2), the received ultrasonic echo signals are the ultrasonic echo signals affected by the comprehensive influence of the anisotropy and temperature of the composite material.

4. The ultrasonic measurement method for the internal temperature of a composite material based on the envelope area according to claim 1, characterized in that In Step (3), the size of the area reflects the influence brought by the temperature.

5. The ultrasonic measurement method for the internal temperature of a composite material based on the envelope area according to claim 1, characterized in that, The composite material includes a high-temperature alloy-based ceramic particle-reinforced composite material Ta10W / SiC.

6. The ultrasonic measurement method for the internal temperature of a composite material based on the envelope area according to claim 5, characterized in that, In Ta10W / SiC, the matrix is Ta10W, the material of the reinforcing particles is SiC, the SiC particles are circular, and the particle size is between 10 and 110 μm.

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