Triaxial compression working condition loading clamp for thermal shock test

Abstract

The utility model discloses a triaxial compression working condition loading clamp for a thermal shock test, which comprises a lower end plate and an upper end plate, the lower end plate and the upper end plate are correspondingly provided with a plurality of mounting through holes, the plurality of mounting through holes are uniformly distributed, a bolt piece is arranged in each mounting through hole, the lower end plate is connected with the upper end plate through the bolt pieces, and the lower end plate is connected with the upper end plate through the bolt pieces. A plurality of test piece mounting grooves are formed between the adjacent mounting through holes; a large strip-shaped groove and a small strip-shaped groove are formed in the middle of the lower end plate, and the middle of the large strip-shaped groove and the middle of the small strip-shaped groove are communicated in a crossed mode. The lower end plate and the upper end plate of the triaxial compression working condition loading clamp are provided with corresponding test piece mounting grooves, so that loading of a plurality of test pieces in the axial direction can be realized; the lower end plate and the upper end plate are provided with corresponding large strip-shaped grooves and small strip-shaped grooves, so that external pressure or internal pressure loading of a plurality of test pieces can be realized; therefore, the test piece can also realize a loading test under a triaxial compression working condition at a thermal shock temperature.

Description

Technical Field

[0001] This utility model relates to the field of thermal shock testing of ceramic materials, specifically to a triaxial compression loading fixture for thermal shock testing. Background Technology

[0002] High-temperature ceramic materials have attracted much attention due to their excellent physical and chemical stability under harsh environmental conditions such as high temperature and oxygen. Current research indicates that high-temperature ceramic materials are among the most promising materials for meeting the thermal protection performance requirements of hypersonic vehicles.

[0003] In the thermal shock resistance test of ultra-high temperature materials, the specimen needs to be subjected to triaxial compression loading test under thermal shock environment. Due to the material and structure of the existing triaxial compression test, 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] To address the aforementioned shortcomings of the existing technology, this utility model provides a triaxial compression loading fixture for thermal shock testing.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: it includes a lower end plate and an upper end plate, the lower end plate and the upper end plate have the same structure, and the lower end plate and the upper end plate are provided with a number of mounting through holes, which are evenly distributed. Each mounting through hole is provided with a bolt, and the lower end plate and the upper end plate are connected by bolts. A number of specimen mounting grooves are provided between adjacent mounting through holes. The middle part of the lower end plate is provided with a large strip groove and a small strip groove, which are intersected and connected in the middle.

[0006] Furthermore, a thermal shock hole is provided in the middle of the lower end plate, and the thermal shock hole is connected to the large strip groove and the small strip groove.

[0007] Furthermore, the length direction of the large strip groove is perpendicular to the length direction of the small strip groove.

[0008] Furthermore, the large and small slots have the same depth.

[0009] Furthermore, several specimen mounting slots are arranged in a circular array around the geometric center of the lower end plate.

[0010] Furthermore, the width of the large strip groove is greater than or equal to the width of the specimen, the width of the small strip groove is greater than or equal to the thickness of the specimen, and the length of the large strip groove and the small strip groove is greater than or equal to the length of the specimen.

[0011] Furthermore, the bolted component includes a bolt and a nut, wherein the bolt is a single-ended bolt.

[0012] Furthermore, the ends of the large strip groove, the small strip groove, and the specimen mounting groove are all provided with arc-shaped parts.

[0013] Furthermore, the lower end plate, upper end plate, and bolts are all made of graphite.

[0014] The beneficial effects of this utility model are as follows:

[0015] The lower and upper end plates of this utility model triaxial compression loading fixture are provided with corresponding specimen mounting slots, which can realize the axial loading of several specimens; the lower and upper end plates are provided with corresponding large and small strip grooves, which can realize the external or internal pressure loading of several specimens; thus, the specimens can also realize the triaxial compression loading test under thermal shock temperature.

[0016] The lower end plate, upper end plate, and bolts of this utility model are all made of graphite, which can still ensure the effect of the triaxial compression loading fixture on the specimen under thermal shock temperature. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the lower end plate in Example 1;

[0019] Figure 3 This is a schematic diagram of the lower end plate in Example 2;

[0020] Figure 4 This is a schematic diagram of the operation of this utility model under internal and external pressure compression conditions;

[0021] Figure 5 This is a schematic diagram of the operation of this utility model under axial compression conditions;

[0022] The symbols for each component are as follows:

[0023] 1. Lower end plate; 11. Mounting through hole; 12. Specimen mounting slot; 13. Large strip groove; 14. Small strip groove; 15. Arc-shaped part; 16. Thermal shock hole;

[0024] 2. Top plate; 3. Bolt; 4. Nut; 5. Specimen. Detailed Implementation

[0025] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0026] Example 1

[0027] like Figure 1 As shown, the triaxial compression loading fixture includes a lower end plate 1 and an upper end plate 2. The lower end plate 1 and the upper end plate 2 have the same structure. Several mounting through holes 11 are correspondingly provided on the lower end plate 1 and the upper end plate 2, and these holes are evenly distributed. Each mounting through hole 11 contains a bolt, and the lower end plate 1 and the upper end plate 2 are connected by bolts. The bolts include bolts 3 and nuts 4. Bolts 3 are preferably single-ended bolts. The lower end plate 1 and the upper end plate 2 can be adjusted and fixed by adjusting the position of the nuts 4. The lower end plate 1 is limited and fixed by bolts 3, and the upper end plate 2 is limited and fixed by nuts 4. Thus, the specimen is clamped and fixed using the lower end plate 1 and the upper end plate 2, allowing for thermal shock testing of ceramic specimens under axial, internal pressure, and external pressure compression conditions. The lower end plate 1, the upper end plate 2, and the bolts are all preferably made of graphite. Graphite has relatively stable physical and chemical properties at high temperatures and is suitable for specimen testing under high-temperature conditions.

[0028] like Figure 2 As shown, several specimen mounting slots 12 are provided between adjacent mounting through holes 11. A large strip groove 13 and a small strip groove 14 are provided in the middle of the lower end plate 1, and the large strip groove 13 and the small strip groove 14 intersect and connect in the middle. In this embodiment, preferably, three specimen mounting slots 12 are provided between adjacent mounting through holes 11, and four are provided for each mounting through hole 11 and bolt component, for a total of twelve specimen mounting slots 12 on the lower end plate 1. The length of the specimen mounting slot 12 is greater than or equal to the width of the specimen 5, and the width of the specimen mounting slot 12 is greater than or equal to the thickness of the specimen 5.

[0029] The length direction of the large strip groove 13 is perpendicular to the length direction of the small strip groove 14. The large strip groove 13 and the small strip groove 14 have the same depth, preferably half the thickness of the specimen. The large strip groove 13 and the small strip groove 14 are used to achieve thermal shock tests under internal and external pressure compression conditions. Several specimen mounting grooves 12 are distributed in a circular array around the geometric center of the lower end plate 1.

[0030] The width of the large strip groove 13 is greater than or equal to the width of the specimen 5, the width of the small strip groove 14 is greater than or equal to the thickness of the specimen 5, and the length of the large strip groove 13 and the small strip groove 14 is greater than or equal to the length of the specimen 5. The ends of the large strip groove 13, the small strip groove 14 and the specimen mounting groove 12 are all provided with arc-shaped parts 15, which facilitate the test personnel to handle and remove the specimen 5.

[0031] Example 2

[0032] The difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 has a thermal shock hole 16 in the middle of the lower end plate 1, which is connected to the large strip groove 13 and the small strip groove 14. Through the thermal shock hole 16 on the lower end plate 1, tests can be conducted under high-temperature gas scouring. For example, in conjunction with a high-temperature gas scouring thermal shock test device with a large span initial temperature as described in patent document CN117686368A, thermal shock tests can be performed under axial, internal pressure, and external pressure compression conditions under high-temperature gas scouring.

[0033] Working process and its principle: such as Figure 4 As shown, when conducting loading tests under internal and external pressure compression conditions, a total of three specimens 5 are required. One specimen 5 is placed in the large strip groove 13 or small strip groove 14 on the upper end plate 2, one specimen 5 is placed in the large strip groove 13 or small strip groove 14 on the lower end plate 1, and one specimen 5 is placed between the upper and lower specimens 5. Then, the lower end plate 1 and the upper end plate 2 are tightened with bolts to fix the three specimens 5, thereby achieving loading clamping under internal and external pressure compression conditions respectively. After the three specimens 5 are fixed, strain gauges 5 are installed on the specimens 5, and the triaxial compression loading fixture can be placed in a thermal shock environment for thermal shock testing. When performing a loading test under external pressure compression conditions, the two ends of several specimens 5 are fixed to the specimen mounting grooves 12 of the upper end plate 2 and the lower end plate 1, respectively. Then, the lower end plate 1 and the upper end plate 2 are tightened by bolts to fix the specimens 5. After several specimens 5 are fixed, strain gauges 5 are installed on the specimens 5. The triaxial compression loading fixture can then be placed in a thermal shock environment for thermal shock testing.

Claims

1. A triaxial compression loading fixture for thermal shock testing, characterized in that, It includes a lower end plate (1) and an upper end plate (2). The lower end plate (1) and the upper end plate (2) have the same structure. The lower end plate (1) and the upper end plate (2) are provided with a plurality of mounting through holes (11). The plurality of mounting through holes (11) are evenly distributed. Each mounting through hole (11) is provided with a bolt. The lower end plate (1) and the upper end plate (2) are connected by bolts. A plurality of specimen mounting grooves (12) are provided between adjacent mounting through holes (11). The lower end plate (1) is provided with a large strip groove (13) and a small strip groove (14) in the middle, and the large strip groove (13) and the small strip groove (14) are intersected and connected in the middle.

2. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, A thermal shock hole (16) is provided in the middle of the lower end plate (1), and the thermal shock hole (16) is connected to the large strip groove (13) and the small strip groove (14).

3. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, The length direction of the large strip groove (13) is perpendicular to the length direction of the small strip groove (14).

4. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, The large strip groove (13) and the small strip groove (14) have the same depth.

5. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, Several of the specimen mounting slots (12) are arranged in a circular array along the geometric center of the lower end plate (1).

6. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, The width of the large strip groove (13) is greater than or equal to the width of the specimen (5), the width of the small strip groove (14) is greater than or equal to the thickness of the specimen (5), and the length of the large strip groove (13) and the small strip groove (14) is greater than or equal to the length of the specimen (5).

7. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, The bolted components include a bolt (3) and a nut (4), wherein the bolt (3) is a single-headed bolt.

8. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, The ends of the large strip groove (13), the small strip groove (14) and the specimen mounting groove (12) are all provided with arc-shaped parts (15).

9. The triaxial compression loading fixture for thermal shock testing according to claim 1, characterized in that, The lower end plate (1), upper end plate (2), and bolts are all made of graphite.

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