Efficient preparation method of dot matrix or speckle resistant to high temperature and vibration impact

Abstract

The invention relates to an efficient preparation method of dot matrixes or speckles resistant to high temperature and vibration impact. The efficient preparation method comprises the following steps that micro-nano particle powder is selected; preparing a mixed solution of the powder and a high-temperature adhesive; coating a special sponge with the mixed solution; using a special seal to be matched with the special sponge; and the dot matrix or the speckle structure is cured to obtain the dot matrix or the speckle which is resistant to high temperature, vibration and impact. According to the preparation method, under the extreme environment of high-temperature / vibration impact multi-field coupling of key materials / structural parts in the aerospace field, the problems that an existing dot matrix or speckle preparation method is single in function, and cannot meet the requirements for on-site preparation, high temperature resistance, vibration impact resistance and accurate characterization of a multi-scale deformation field are solved.

Description

Technical Field

[0001] The present invention relates to a method for efficiently preparing a dot matrix or speckle pattern that is resistant to high temperature and vibration impact, and relates to the fields of solid experimental mechanics and thermal testing, in particular to a method for measuring full-field displacement and deformation field under coupling effects of heat, vibration impact, etc. The method is applied to the DIC and GPA in the fields of aerospace, high-temperature ceramic materials, etc. to measure displacement and strain under high-temperature vibration conditions. Background Art

[0002] Two images of the deformation carrier before and after the surface deformation, two non-contact measurement methods to obtain deformation information through calculation. Both methods have a wide range of uses in different time and space scales and in different experimental environments, especially in deformation measurement under extreme environments such as high temperature, vibration and shock.

[0003] Speckle or dot matrix is ​​a common deformation carrier in DIC and GPA deformation measurement methods. Its preparation is a key link in digital image correlation method and geometric phase analysis method, and is also the basis for the success of DIC and GPA methods. It is usually prepared by spin coating, nanofilm reconstruction, focused ion beam (FIB) etching, scratching, abrasion, photolithography technology, etc. for micro-nanoscale speckle or dot matrix. In the macro field, especially in high-temperature application environments, ceramic spots are usually sprayed by using plasma spraying, thermal spraying, spray guns, etc. The speckle prepared by this method has a large residual stress due to the rapid heating and cooling stage, which has a great impact on the test piece. At the same time, the equipment is large and inconvenient to use on-site or in limited space. Macroscopic dot matrix is ​​usually prepared by laser etching, which is easy to cause damage to the surface of the material to be tested and is not convenient for on-site production.

[0004] Among the existing patent technologies, the patent (CN 115872742A) discloses a method for preparing high-temperature DIC speckles from room temperature to 3000°C. This method has low cost, strong operability, and can withstand high temperatures of 3000°C. However, this method uses a dot coating method to prepare speckles, and the size, thickness, and quality of the produced speckles are not easy to control. The additional effect on the material to be tested is large and the adhesion is insufficient. It is difficult to apply to vibration and shock environments, and it is impossible to prepare regular dot arrays.

[0005] Many components in the aerospace field work in high temperature and vibration impact environments, and multiple methods are needed to measure and study their deformation behavior. However, the existing methods for preparing deformation carriers such as dot matrix or speckle are mostly single-function and cannot meet the requirements of on-site preparation and multiple methods of mechanical behavior detection in high temperature and vibration impact environments. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] Based on the characterization of mechanical properties of ceramic materials and high-temperature alloy materials under high-temperature vibration environment, higher requirements are put forward for the dot matrix and speckle production methods when using digital image correlation method and geometric phase analysis method for non-contact measurement. In view of the shortcomings of the above-mentioned prior art, the present invention proposes an efficient preparation method for dot matrix or speckle that is resistant to high temperature and vibration impact. In the extreme environment of high temperature / vibration impact multi-field coupling of key materials / structural parts in the aerospace field, the existing dot matrix or speckle preparation method has a single function and cannot meet the requirements of on-site preparation and high temperature resistance and vibration impact resistance, as well as accurate characterization of multi-scale deformation fields. The present invention is a new technology for preparing macro-micro deformation carriers with the characteristics of vibration / impact resistance, high temperature resistance of 2500℃, high precision, small additional effect on the material to be tested, easy to use on-site, large-area one-time molding, easy to make a variety of deformation carriers and high contrast, which effectively eliminates the influence of rigid body motion during vibration impact, and lays a solid foundation for in-depth research on material failure mechanisms under extreme environments.

[0008] (II) Technical solution

[0009] A method for efficiently preparing a dot matrix or speckle pattern that is resistant to high temperature and vibration shock comprises the following steps:

[0010] S1. Select micro-nano particle powder that is resistant to high temperatures and has a large color contrast with the surface of the material to be tested;

[0011] S2. The nanoparticle powder is mixed with a high temperature resistant binder to form a mixture, and stirred and dispersed uniformly for standby use;

[0012] S3. Take the above mixture, apply it on a special sponge, penetrate it evenly, and set aside;

[0013] S4. Use a special stamp and a special sponge to make a thin layer of the mixed liquid adsorbed or infiltrated on the special stamp. The adsorption or infiltration of the mixed liquid should be uniform and not connected in one piece;

[0014] S5. Imprint the specially made stamp evenly on the surface of the material to be tested to form a dot matrix or speckle structure;

[0015] S6. solidifying the dot matrix or speckle structure at room temperature or by heating;

[0016] S7. Obtain a dot matrix or speckle pattern that is resistant to high temperature, vibration and impact.

[0017] The micro-nano particle powder in step S1 can withstand high temperatures above 2500° C., and is made of one or more of metal, alloy or ceramic.

[0018] The micro-nano particle powder composed of the metal is off-white tungsten powder, or off-black or silver-grey tantalum powder.

[0019] The micro-nano particle powder of the ceramic composition is white zirconium dioxide particle powder and black cobalt oxide particle powder.

[0020] The high temperature resistant adhesive in step S2 is one or more of a high temperature glue or an inorganic high temperature adhesive or a high temperature composite adhesive having high strength after curing.

[0021] The mixing in step S2 uses a volume ratio of the micro-nano particle powder to the high temperature resistant adhesive in a range of 2:1 to 1:5.

[0022] The coordination in step S4 is: pressing the special seal on the special sponge, or covering the special sponge infiltrated with the mixed liquid on the seal pad of the special seal, or directly applying the mixed liquid on the seal pad of the special seal.

[0023] The specially made seal is a carved seal or a penetration seal with a seal surface design and a dot matrix or speckle pattern.

[0024] The invention discloses a method for efficiently preparing a dot matrix or speckle pattern that is resistant to high temperature and vibration impact, and is used for non-contact measurement of full-field deformation of aerospace materials caused by vibration impact in a high temperature environment.

[0025] The aerospace material is a ceramic composite material or a high-temperature alloy material.

[0026] (III) Beneficial effects

[0027] Compared with the prior art, the high-efficiency preparation method of a dot matrix or speckle resistant to high temperature and vibration shock of the present invention has the following beneficial technical effects:

[0028] (1) Using dot matrix or speckle particle powder, such as tungsten powder, tantalum powder, cobalt oxide, zirconium dioxide, etc., can ensure stability at high temperatures, withstand high temperatures above 2000°C, and have bright colors, which can form a clear grayscale difference with the surface of the material to be tested, with high contrast;

[0029] (2) The deformable carrier is prepared by imprinting technology, and a very thin dot matrix or speckle structure is obtained, which is light in weight, has a small additional effect, strong adhesion and impact resistance;

[0030] (3) By using specially made stamps with optimized dot or speckle patterns, it is possible to achieve large-area one-time molding and efficient simultaneous preparation of various deformation carriers such as regular dot arrays and random speckles, and to facilitate repeated production and repeated experiments;

[0031] (4) The equipment and materials used are easy to carry, simple to operate, convenient for on-site use, and highly operable;

[0032] (5) The digital image correlation method based on speckle or dot matrix and the geometric phase analysis method can be used simultaneously to accurately track displacement and measure strain, and can obtain more accurate strain calculation results while verifying each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 High temperature resistant speckle image prepared on a ceramic plate using cobalt oxide in Example 1

[0034] Figure 2 Speckle optical image of the high-temperature lattice prepared on the surface of the nickel-based alloy in Example 2 when heated to 1000°C DETAILED DESCRIPTION

[0035] The present invention provides a method for efficiently preparing a dot matrix or speckle pattern that is resistant to high temperature and vibration impact, comprising the following steps:

[0036] S1. Select micro-nano particle powder that is resistant to high temperatures and has a large color contrast with the surface of the material to be tested;

[0037] S2. The nanoparticle powder is mixed with a high temperature resistant binder to form a mixture, and stirred and dispersed uniformly for standby use;

[0038] S3. Take the above mixture, apply it on a special sponge, penetrate it evenly, and set aside;

[0039] S4. Use a special stamp and a special sponge to make a thin layer of the mixed liquid adsorbed or infiltrated on the special stamp. The adsorption or infiltration of the mixed liquid should be uniform and not connected in one piece;

[0040] S5. Imprint the specially made stamp evenly on the surface of the material to be tested to form a dot matrix or speckle structure;

[0041] S6. solidifying the dot matrix or speckle structure at room temperature or by heating;

[0042] S7. Obtain a dot matrix or speckle pattern that is resistant to high temperature, vibration and impact.

[0043] The micro-nano particle powder in step S1 can withstand high temperatures above 2500° C., and is made of one or more of metal, alloy or ceramic.

[0044] The micro-nano particle powder composed of the metal is off-white tungsten powder, or off-black or silver-grey tantalum powder.

[0045] The micro-nano particle powder of the ceramic composition is white zirconium dioxide particle powder and black cobalt oxide particle powder.

[0046] The high temperature resistant adhesive in step S2 is one or more of high temperature glue, inorganic high temperature adhesive or high temperature composite adhesive having high strength after curing. The high temperature resistant adhesive is aluminum dihydrogen phosphate.

[0047] The mixing in step S2 uses a volume ratio of the micro-nano particle powder to the high temperature resistant adhesive in a range of 2:1 to 1:5.

[0048] The special sponge is a porous sponge with high hygroscopicity and high permeability.

[0049] The coordination in step S4 is: pressing the special seal on the special sponge, or covering the special sponge infiltrated with the mixed liquid on the seal pad of the special seal, or directly applying the mixed liquid on the seal pad of the special seal.

[0050] The specially made stamp is a carved stamp or a penetration stamp with a stamp surface designed and made into a dot matrix or speckle pattern. The penetration stamp is an atomic stamp or a photosensitive stamp.

[0051] The seal pad is a highly permeable porous material with a seal surface prepared with a dot matrix or speckle pattern.

[0052] The invention discloses a method for efficiently preparing a dot matrix or speckle pattern that is resistant to high temperature and vibration impact, and is used for non-contact measurement of full-field deformation of aerospace materials caused by vibration impact in a high temperature environment.

[0053] The aerospace material is a ceramic composite material or a high-temperature alloy material.

[0054] Two specific embodiments are provided below:

[0055] Example 1

[0056] See also Figure 1 In this embodiment 1, black cobalt oxide with an average particle size of 45 microns is selected as the micro-nano particle powder, and aluminum dihydrogen phosphate is selected as the high-temperature binder. The black cobalt oxide and aluminum dihydrogen phosphate liquid are mixed evenly in a volume ratio of 1:1, stirred and dispersed evenly, and the mixed liquid is transferred to a special sponge using a dropper, and penetrated evenly. A special stamp with speckles is made and printed on the special sponge, and then printed on the zirconia ceramic plate. The obtained speckle image can be recognized and analyzed by VIC-2D software.

[0057] Example 2

[0058] See also Figure 2In this embodiment 2, black cobalt oxide with an average particle size of 45 microns is selected as the micro-nano particle powder, and aluminum dihydrogen phosphate is selected as the high-temperature binder. The black cobalt oxide and aluminum dihydrogen phosphate liquid are mixed evenly in a volume ratio of 1:1, and after stirring and dispersing evenly, the mixed liquid is transferred to a special sponge using a dropper, and penetrated evenly. A special seal with a regular dot matrix is ​​made and imprinted on the special sponge, and then imprinted on a high-temperature nickel-based alloy plate. After curing at room temperature, the speckle image obtained by repeated heating to 1000 degrees can be recognized and analyzed by VIC-2D software.

Claims

1. A method for efficiently preparing a dot matrix or speckle pattern that is resistant to high temperature and vibration shock, characterized in that: The following steps are involved: S1. Select micro-nano particle powder that is resistant to high temperatures and has a large color contrast with the surface of the material to be tested; S2. The nanoparticle powder is mixed with a high temperature resistant binder to form a mixture, and stirred and dispersed evenly for later use; S3. Take the above mixture, apply it on a special sponge, penetrate it evenly, and set aside; S4. Use a special stamp and a special sponge to make a thin layer of the mixed liquid adsorbed or infiltrated on the special stamp. The adsorption or infiltration of the mixed liquid should be uniform and not connected in one piece; S5. Imprint the specially made stamp evenly on the surface of the material to be tested to form a dot matrix or speckle structure; S6. solidifying the dot matrix or speckle structure at room temperature or by heating; S7. Obtain a dot matrix or speckle pattern that is resistant to high temperature, vibration and impact.

2. The high-efficiency preparation method of a dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 1, characterized in that: The micro-nano particle powder in step S1 can withstand high temperatures above 2500° C., and is made of one or more of metal, alloy or ceramic.

3. The high-efficiency preparation method of dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 2, characterized in that: The micro-nano particle powder composed of the metal is off-white tungsten powder, or off-black or silver-grey tantalum powder.

4. The high-efficiency preparation method of a dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 2, characterized in that: The micro-nano particle powder of the ceramic composition is white zirconium dioxide particle powder and black cobalt oxide particle powder.

5. The high-efficiency preparation method of dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 1, characterized in that: The high temperature resistant adhesive in step S2 is one or more of a high temperature glue or an inorganic high temperature adhesive or a high temperature composite adhesive having high strength after curing.

6. The high-efficiency preparation method of dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 1, characterized in that: The mixing in step S2 uses a volume ratio of the micro-nano particle powder to the high temperature resistant adhesive in a range of 2:1 to 1:

5.

7. The high-efficiency preparation method of dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 1, characterized in that: The coordination in step S4 is: pressing the special seal on the special sponge, or covering the special sponge infiltrated with the mixed liquid on the seal pad of the special seal, or directly applying the mixed liquid on the seal pad of the special seal.

8. The high-efficiency preparation method of a dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 7, characterized in that: The specially made seal is a carved seal or a penetration seal with a seal surface design and a dot matrix or speckle pattern.

9. Use of the high-efficiency preparation method of dot matrix or speckle pattern resistant to high temperature and vibration shock according to claim 1 for non-contact measurement of full-field deformation of aerospace materials caused by vibration shock in a high temperature environment.

10. The use as claimed in claim 9, wherein the aerospace material is a ceramic composite material or a high temperature alloy material.

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