Measuring tool for compressive deformation of carbon / carbon composite material

Abstract

The utility model relates to a measuring tool for compressive deformation of a carbon / carbon composite material in the technical field of material testing, and the measuring tool comprises a pressure head, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor, a pressure sensor and a pressure sensor, and the pressure sensor forms a contact surface with the diameter of 10-15.8 mm; the connector is connected to the pressing head, and the connector is located on the side, away from the contact face, of the pressing head. The measuring tool can be used for measuring the amount of compression generated by the carbon / carbon composite material under a certain load so as to judge the looseness degree of the carbon / carbon composite material, and simple and rapid performance detection is provided for the carbon / carbon composite material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material testing, in particular to a measuring tool for compression deformation of carbon / carbon composite material. BACKGROUND

[0002] Carbon / carbon composite material has the advantages of low density, high strength, high modulus, good fracture toughness, wear resistance, thermal shock resistance, small thermal expansion coefficient, etc., and has been widely used in the manufacture of airplane brake discs. However, carbon / carbon composite material starts to oxidize at 370℃, and the oxidation rate increases rapidly when the temperature exceeds 500℃, which eventually leads to a significant decrease in mechanical properties. Therefore, it is necessary to coat the non-friction surface of the airplane brake disc with an anti-oxidation coating. Therefore, it is crucial for the anti-oxidation coating to maintain its integrity during service. In actual use, the piston applies pressure to the brake disc, causing compression deformation of the carbon / carbon composite material. Excessive compression deformation can cause the coating to crack, the coating integrity to be destroyed, the carbon / carbon composite material to be directly exposed to oxygen, and the anti-oxidation coating to be partially ineffective, ultimately affecting the service life of the brake disc.

[0003] Currently, air-coupled ultrasonic flaw detection can be used to detect delamination defects of carbon / carbon composite material products, but it is not suitable for detecting porosity caused by poor deposition, and the air-coupled ultrasonic flaw detection equipment is expensive and the test time is long. There is a lack of necessary detection means for rapid non-destructive testing of carbon / carbon brake disc porosity in production. CONTENT OF THE INVENTION

[0004] In view of the problems in the background art, the present application provides a measuring tool for compression deformation of carbon / carbon composite material, which can provide simple and rapid performance testing for carbon / carbon composite material.

[0005] According to one aspect of the present application, a measuring tool for compression deformation of carbon / carbon composite material is provided, comprising: a pressure head, one end of the pressure head forms a contact surface, the diameter of the contact surface is 10-15.8mm; a joint, the joint is connected to the pressure head, and the joint is located on the side of the pressure head away from the contact surface.

[0006] By using the measuring tool for compression deformation of carbon / carbon composite material in the technical solution, the looseness degree of the material can be judged by using the carbon disc deformation size under the certain load of the brake piston in the airplane braking process, the load is generated based on the Rockwell hardness tester, the contact surface of the pressure head with appropriate size is adopted, the measuring tool is installed on the Rockwell hardness tester through the joint, the pressure of the airplane brake piston can be simulated, the Rockwell hardness tester can provide accurate deformation, the measuring tool is used, the compression amount generated under a certain load is measured by using the Rockwell hardness tester, so that the looseness degree of the carbon / carbon composite material is judged, the uniformity of the material and whether there is a delamination defect can be judged, the simple and rapid performance detection of the carbon / carbon composite material can be provided, the overlarge compression deformation under a certain load is prevented, the coating is prevented from being squeezed and cracked, the coating integrity is prevented from being damaged, the service life of the brake disc is finally affected, and the carbon brake disc is prevented from being caused to fail early due to looseness.

[0007] In some embodiments of the present application, the flatness of the contact surface is less than 0.8.

[0008] In some embodiments of the present application, the hardness of the pressure head is greater than 40HRC.

[0009] In some embodiments of the present application, the pressure head is made of tool steel or low alloy steel.

[0010] In some embodiments of the present application, the edge of the contact surface is provided with a chamfer or a round corner.

[0011] In some embodiments of the present application, the joint is a cylinder, and the joint is coaxially arranged with the pressure head.

[0012] In some embodiments of the present application, a mounting plane perpendicular to the contact surface is formed on the side wall of the joint.

[0013] In some embodiments of the present application, the end surface edge of the joint away from the pressure head is chamfered or rounded. BRIEF DESCRIPTION OF DRAWINGS

[0014] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present application. Moreover, the same reference numerals are used throughout the same figures. In the drawings:

[0015] Figure 1 is a schematic diagram of the overall structure of the measuring tool for compression deformation of carbon / carbon composite material of the present application;

[0016] Figure 2 is a front view of the measuring tool for compression deformation of carbon / carbon composite material of the present application.

[0017] The reference numbers in the drawings represent the following: 1, indenter; 2, joint; 3, contact surface; 4, mounting plane. DETAILED DESCRIPTION

[0018] It should be noted that the described embodiments are merely some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0019] The following description refers to the accompanying drawings. Unless otherwise indicated, same numbers in different drawings indicate same or similar elements. The following description of the exemplary embodiments is not meant to represent all embodiments in accord with the present application. Rather, they are merely examples of apparatus and methods in accord with some aspects of the present application as detailed in the appended claims.

[0020] In the description of the present application, it should be understood that the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" means two or more. "And / or", which describes the association between the associated objects, means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0021] The measuring tool for compression deformation of carbon / carbon composite material provided by the embodiments of the present application is described below in combination with the drawings.

[0022] The embodiments of the present application disclose a measuring tool for compression deformation of carbon / carbon composite material, as shown in Figure 1 and Figure 2 The measuring tool includes an indenter 1 and a joint 2. One end of the indenter 1 forms a contact surface 3, and the diameter of the contact surface 3 is 10-15.8 mm. The joint 2 is connected to the indenter 1, and the joint 2 is located on the side of the indenter 1 away from the contact surface 3.

[0023] By using the measuring tool in the technical solution, the looseness degree of the material can be judged by using the carbon disc deformation amount under a certain load of the brake piston during the braking of the airplane, the load is generated based on the Rockwell hardness tester, the contact surface 3 of the indenter 1 with a proper size is adopted, the measuring tool is installed on the Rockwell hardness tester through the joint 2, the pressure of the brake piston of the airplane can be simulated, the Rockwell hardness tester can provide accurate deformation amount, the measuring tool is used, the Rockwell hardness tester is used to measure the compression amount generated under a certain load to judge the looseness degree of the carbon / carbon composite material, the uniformity of the material and whether there is a delamination defect can be judged, the carbon / carbon composite material can be provided with simple and rapid performance detection, the overlarge compression deformation under a certain load is prevented to cause the coating to be squeezed and cracked, the coating integrity is prevented from being damaged, the service life of the brake disc is finally affected, and the carbon brake disc is prevented from being caused to fail early due to looseness.

[0024] It should be noted that according to the size of the workpiece testing site, the size of the indenter 1 and the contact surface 3 and the size of the load can be reasonably selected, for example, the diameter of the contact surface 3 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 15.8mm, etc.

[0025] Specifically, in the embodiment, the diameter of the contact surface 3 of the circular flat indenter 1 can be designed as 10mm, and the load can be selected as 588.4N; or the diameter of the contact surface 3 of the circular flat indenter 1 can be designed as 15.8mm, and the load can be selected as 1471N.

[0026] In the embodiment, the carbon / carbon composite material without defects can be taken as a standard, and the compression amount is recorded as a standard value, the compression amount of the sample or workpiece can be tested under the same indenter 1 and load conditions, and it can be determined that the sample or workpiece can meet the use requirements if the standard value is exceeded by a large margin (for example, the test value is greater than 20% of the standard value).

[0027] In addition, the Rockwell hardness tester can first apply a pre-compression load to the sample or workpiece through the indenter 1, and the pre-compression load can be 98.07N, and then the load is started to be loaded and the sample compression amount is recorded.

[0028] In some embodiments of the utility model, the flatness of the contact surface 3 is less than 0.8.

[0029] By controlling the flatness of the contact surface 3 to be less than 0.8, the contact surface 3 of the indenter 1 is more flat, and the uniformity of the load applied by the indenter 1 to the sample or workpiece is further improved.

[0030] In some embodiments of the utility model, the hardness of the indenter 1 is greater than 40HRC.

[0031] Preferably, the indenter 1 can be made of tool steel or low alloy steel.

[0032] By controlling the hardness of the indenter 1, using high hardness materials such as tool steel or low alloy steel, etc. to manufacture the indenter 1, the measurement deviation caused by the micro-deformation of the indenter 1 can be greatly reduced, the stability of the indenter 1 to the sample or workpiece is ensured, and the measurement precision of the sample or workpiece under a certain load is improved.

[0033] It should be noted that the joint 2 can be made of the same or different material as the indenter 1, and preferably made of the same material, and the joint 2 and the indenter 1 can be integrally formed.

[0034] In some embodiments of the utility model, as shown in Figure 2 The edge of the contact surface 3 is provided with a chamfer or a round corner.

[0035] By providing a chamfer or other transition structure on the edge of the contact surface 3, the damage to the workpiece caused by the direct measurement of the workpiece by the measurement tool can be reduced, thereby ensuring the use performance of the workpiece.

[0036] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The joint 2 is a cylinder, and the joint 2 is coaxially arranged with the indenter 1.

[0037] Coaxially arranging the joint 2 with the indenter 1, when the Rockwell hardness tester indirectly applies a load to the indenter 1 by directly applying a force to the indenter 1 through the joint 2, the force distribution of the joint 2 to the indenter 1 can be more uniform, thereby ensuring the uniformity of the load applied by the indenter 1 to the sample or workpiece.

[0038] Further, the side wall of the joint 2 is formed with a mounting plane 4 perpendicular to the contact surface 3.

[0039] By designing the mounting plane 4 on one side of the joint 2, the measurement tool can be stably connected with the Rockwell hardness tester, and the use stability of the measurement tool is improved.

[0040] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The edge of the end surface of the joint 2 away from the indenter 1 is chamfered or rounded.

[0041] By providing a chamfer or other guide structure on the edge of the end surface of the joint 2 away from the indenter 1, the assembly efficiency of the measurement tool and the Rockwell hardness tester can be improved, thereby improving the test efficiency of the sample or workpiece.

[0042] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A measuring tool for the compression deformation of carbon / carbon composite materials, characterized in that, The application relates to a pressure head, comprising: a pressure head, one end of which is formed with a contact surface with a diameter of 10-15.8 mm; a joint connected to the pressure head, the joint being located on the side of the pressure head away from the contact surface.

2. The measuring tool for compression set of carbon / carbon composite material according to claim 1, wherein The flatness of the contact surface is less than 0.

8.

3. The measuring tool for compression set of carbon / carbon composite material according to claim 1, wherein The hardness of the pressure head is greater than 40HRC.

4. The measuring tool for compression set of carbon / carbon composite material according to claim 3, wherein The pressure head is made of tool steel or low-alloy steel.

5. The measuring tool for compression set of carbon / carbon composite material according to claim 1, wherein The edge of the contact surface is provided with a chamfer or a round corner.

6. The measuring tool for compression set of carbon / carbon composite material according to claim 1, wherein The joint is a cylinder, and the joint is coaxially arranged with the pressure head.

7. The measuring tool for compression set of carbon / carbon composite material according to claim 6, wherein A mounting plane perpendicular to the contact surface is formed on the side wall of the joint.

8. The measuring tool for compression set of carbon / carbon composite material according to claim 7, wherein The end surface edge of the joint away from the pressure head is formed with a chamfer or a round corner.

Images