Three-point bending test piece loading clamp for thermal shock test
By designing a combined structure of a left clamp, a right clamp and a middle support column made of graphite, the problem of poor loading performance of existing fixtures under thermal shock temperatures was solved, and stable clamping and loading of the specimens at high temperatures were achieved.
Patent Information
- Application Number
- CN202422489844.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-15
AI Technical Summary
The existing three-point bending test fixture is difficult to ensure good loading performance under thermal shock temperature and cannot effectively support and clamp the specimen.
A combined structure of a left clamp, a right clamp and a middle support column is adopted. A graphite clamp is used to maintain the clamping effect at high temperatures. The clamp and support column are designed as semi-cylinders and cylinders, and three-point bending loading is achieved through bolt connections.
Under thermal shock temperature, the specimen is stably clamped and loaded, ensuring the effective conduct of the three-point bending test. The material selection and structural design of the fixture ensure the loading performance under high temperature.
Smart Images
Figure CN223346591U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of thermal shock tests of ceramic materials, in particular to a three-point bending specimen loading fixture for thermal shock tests. Background Art
[0002] Bending test is an important test method for measuring the bending stiffness, strength, and load-deflection properties of composite laminates. Domestic and international standards such as ASTM D7264, ASTM D790, HB 7617-1998, and ASTM C1341 all provide specific test methods for measuring the bending stiffness, strength, and load-deflection properties of composite materials using bending tests.
[0003] In the thermal shock resistance test of ultra-high temperature materials, the specimen needs to undergo a three-point bending loading test under a thermal shock environment. Due to the material and structure of the existing three-point bending test fixture, it is difficult to ensure good loading performance under thermal shock temperature. Therefore, it is necessary to propose a three-point bending specimen loading fixture for thermal shock test. Summary of the Invention
[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a three-point bending specimen loading fixture for a thermal shock test.
[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the utility model is: it includes a left clamping member, a right clamping member and a middle support column, the left clamping member and the right clamping member are used to support the ends of the specimen, the middle support column is used to support the middle of the specimen, and the left clamping member and the right clamping member have the same structure; the left clamping member includes an upper clamping member and a lower clamping member with the same structure, the upper clamping member and the lower clamping member are arranged opposite to each other, and the upper clamping member and the lower clamping member are connected by two symmetrically arranged bolt members.
[0006] Furthermore, the upper clamping member includes a clamping body, a clamping opening that cooperates with the test piece is provided in the middle of the clamping body, an end clamping column is provided in the clamping opening, the axis of the end clamping column is in the same direction as the axis of the middle support column, and a first through hole and a second through hole that cooperate with the bolt member are respectively provided at both ends of the clamping body.
[0007] Furthermore, the end clamping column is a semi-cylinder, the middle support column is a cylinder, and the diameters of the end clamping column and the middle support column are the same.
[0008] Furthermore, the clamping opening is a rectangular opening, the width of the rectangular opening is greater than the width of the test piece; and the depth of the clamping opening is greater than the radius of the end clamping column.
[0009] Furthermore, the first through hole and the second through hole are both light holes.
[0010] Furthermore, the bolt assembly includes a bolt and a nut, and the bolt is a single-head bolt.
[0011] Furthermore, the left clamping member, the right clamping member, the middle support column and the bolt member are all made of graphite.
[0012] The beneficial effects of the utility model are:
[0013] The three-point bending specimen loading fixture of the present invention is provided with a left clamping part and a right clamping part with the same structure. The left clamping part includes an upper clamping part and a lower clamping part with the same structure. The upper clamping part and the lower clamping part cooperate with the middle support column to realize the three-point bending loading and fixation of the two specimens.
[0014] The upper and lower clamping members of this utility model are both equipped with end clamping columns. These clamping columns clamp and bend the ends of the specimen, and cooperate with the central support column to clamp and squeeze the middle of the specimen, ultimately achieving three-point bending clamping of two back-to-back specimens. The left and right clamping members and central support column of this utility model are all made of graphite. Even under thermal shock temperatures, the external force applied by the three-point bending specimen loading fixture can still be effectively applied to the specimen. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The overall structure of the utility model is shown in FIG. Figure 1 ;
[0016] Figure 2 This is a schematic diagram of the overall structure of the utility model in another direction Figure 2 ;
[0017] Figure 3 Schematic diagram of the structure of the upper clamp Figure 1 ;
[0018] Figure 4 Schematic diagram of the upper clamping part in another direction Figure 2 ;
[0019] The symbols of the components are as follows:
[0020] 1. Left clamping member; 11. Upper clamping member; 111. Clamping opening; 112. End clamping column; 113. First through hole; 114. Second through hole; 12. Lower clamping member; 2. Right clamping member; 3. Middle support column; 4. Bolt; 5. Nut; 6. Test piece. DETAILED DESCRIPTION
[0021] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.
[0022] like Figure 1 and 2 As shown, the three-point bend specimen loading fixture is used with two specimens 6. The three-point bend specimen loading fixture includes a left clamp 1, a right clamp 2, and a central support column 3. The left clamp 1 and the right clamp 2 are used to support the ends of the specimen 6, and the central support column 3 is used to support the middle of the specimen 6. The left clamp 1 and the right clamp 2 have the same structure. The left clamp 1, the right clamp 2, and the central support column 3 are preferably made of graphite.
[0023] The left clamp 1 comprises an upper clamp 11 and a lower clamp 12 of identical structure. The upper and lower clamps 11 and 12 are positioned opposite each other and connected by two symmetrically positioned bolts. The bolts comprise a bolt 4 and a nut 5. Bolt 4 is a single-headed bolt. The bolts are preferably made of graphite.
[0024] like Figure 3 and 4 As shown, the upper clamping member 11 includes a clamping body. A clamping opening 111 is provided in the middle of the clamping body to mate with the test piece 6. An end clamping column 112 is provided within the clamping opening 111. The axis of the end clamping column 112 is aligned with the axis of the middle support column 3. A first through hole 113 and a second through hole 114 are provided at each end of the clamping body to mate with the bolt member. Both the first through hole 113 and the second through hole 114 are clear holes. The apertures of the first through hole 113 and the second through hole 114 match the outer diameter of the bolt 4, allowing the bolt 4 to move normally within the through holes, but with minimal radial movement.
[0025] The end clamping columns 112 are semi-cylindrical, and the middle support column 3 is cylindrical. The diameters of the end clamping columns 112 and the middle support column 3 are the same. The contact between the middle support column 3 and the end clamping columns 112 and the specimen 6 is line contact, ensuring that the clamping force is evenly distributed and consistent.
[0026] The clamping opening 111 is a rectangular opening, wider than the width of the specimen 6 and preferably twice the width of the specimen 6, ensuring that the specimen 6 is subjected to force at only three points and avoids contact with the rest of the three-point bend specimen loading fixture. The depth of the clamping opening 111 is greater than the radius of the end clamping column 112. The end clamping column 112 is integrally designed with the upper clamping member 11, and the axis of the upper clamping member 11 is parallel to its length.
[0027] Working process and principle: Before the test, the two specimens 6 are clamped and fixed by the left clamping member 1, the right clamping member 2 and the middle support column 3. Specifically, one specimen 6 is placed on the upper clamping member 11 of the left clamping member 1 and the right clamping member 2, and the specimen 6 is clamped by the end clamping column 112 on the upper clamping member 11. At the same time, the other specimen 6 is placed on the lower clamping member 12 of the left clamping member 1 and the right clamping member 2, and the specimen 6 is clamped by the end clamping column 112 on the lower clamping member 12. At the same time, the middle position of the two specimens 6 is supported by the middle support column 3. Then, the tightness of the bolts on the left clamping member 1 and the right clamping member 2 is adjusted, and the two specimens 6 and the middle support column 3 are adjusted and tightened to achieve three-point bending fixation of the specimens 6. After the two specimens 6 are fixed, strain gauges are fixed on the specimens 6, and the three-point bending thermal shock test of ceramic materials can be carried out.
Claims
1. A three-point bending specimen loading fixture for thermal shock testing, used in conjunction with two specimens (6), characterized in that: The test piece (6) comprises a left clamping piece (1), a right clamping piece (2) and a middle support column (3), wherein the left clamping piece (1) and the right clamping piece (2) are used to support the ends of the test piece (6), and the middle support column (3) is used to support the middle of the test piece (6). The left clamping piece (1) and the right clamping piece (2) have the same structure. The left clamping member (1) comprises an upper clamping member (11) and a lower clamping member (12) of identical structure. The upper clamping member (11) and the lower clamping member (12) are arranged opposite to each other, and the upper clamping member (11) and the lower clamping member (12) are connected by two symmetrically arranged bolt members.
2. The three-point bending specimen loading fixture for thermal shock test according to claim 1, characterized in that: The upper clamping member (11) includes a clamping body, a clamping opening (111) that cooperates with the test piece (6) is provided in the middle of the clamping body, an end clamping column (112) is provided in the clamping opening (111), the axis of the end clamping column (112) is in the same direction as the axis of the middle support column (3), and a first through hole (113) and a second through hole (114) that cooperate with the bolt member are respectively provided at both ends of the clamping body.
3. The three-point bending specimen loading fixture for thermal shock test according to claim 2, characterized in that: The end clamping column (112) is a semi-cylinder, the middle support column (3) is a cylinder, and the end clamping column (112) and the middle support column (3) have the same diameter.
4. The three-point bending specimen loading fixture for thermal shock test according to claim 2, characterized in that: The clamping opening (111) is a rectangular opening, the width of which is greater than the width of the test piece (6); and the depth of the clamping opening (111) is greater than the radius of the end clamping column (112).
5. The three-point bending specimen loading fixture for thermal shock test according to claim 2, characterized in that: The first through hole (113) and the second through hole (114) are both light holes.
6. The three-point bending specimen loading fixture for thermal shock test according to claim 1, characterized in that: The bolt assembly comprises a bolt (4) and a nut (5), wherein the bolt (4) is a single-head bolt.
7. The three-point bending specimen loading fixture for thermal shock test according to claim 1, characterized in that: The left clamping member (1), the right clamping member (2), the middle support column (3) and the bolt member are all made of graphite.