Long-term metal material compression creep experiment device

Abstract

The utility model discloses a long -term metal material compression creep experimental device relates to material testing technical field. The device includes compression subassembly, temperature control subassembly and detection subassembly. Compression subassembly is by upper compression plate, lower compression plate and detachable upper and lower compression head constitutes, is used for clamping and loading test sample. The innovation of temperature control subassembly lies in, is equipped with condensate water channel in the inside of upper and lower compression head, and the outside has the heating jacket, and adopts the heat insulation of split type heat preservation bin, realizes the fast, accurate two -way regulation of test sample temperature through temperature controller. Detection subassembly passes through high accuracy displacement meter and monitors test sample deformation in real time. The utility model solves the problem of temperature control lag, insufficient precision and test sample replacement inconvenience in the prior art, and the reliability, repeatability and efficiency of long -term creep experiment are improved obviously.

Description

Technical Field

[0001] This utility model relates to the technical field of material testing and experimental devices, specifically to a compression creep experimental device for testing the long-term creep performance of metallic materials. Background Technology

[0002] This section provides only background information related to this application to enable those skilled in the art to understand this application more thoroughly and accurately, and it is not necessarily prior art.

[0003] Metal creep refers to the phenomenon where materials undergo slow, gradual plastic deformation over time under high temperature and constant stress. This process is irreversible; with prolonged service life, the material exhibits continuous dimensional changes and may even experience sudden fracture below its yield strength, posing a serious threat to the safety and reliability of components. Creep properties directly affect the mechanical properties, stability, and service life of materials. Therefore, systematically studying the creep behavior of metallic materials and establishing the relationship between temperature, stress, time, and creep is of great significance for the development and engineering applications of novel heat-resistant materials.

[0004] Existing experimental setups for compression creep of metallic materials typically employ a heating ring (sleeve) in conjunction with a temperature control device to heat the upper and lower indenters, thereby controlling the sample temperature. However, this type of device relies on a relatively simple temperature control method, primarily depending on heating. Cooling is often achieved by stopping heating or allowing natural cooling, failing to meet the demands for rapid cooling and precise temperature control during experiments. Due to these limitations, existing devices generally suffer from problems such as delayed temperature feedback and insufficient temperature control accuracy, making it difficult to maintain a stable experimental temperature and thus affecting the accuracy and repeatability of long-term creep data. Utility Model Content

[0005] The purpose of this utility model is to at least partially solve one of the technical problems in related technologies. Therefore, a long-term compression creep testing device for metallic materials is provided, comprising a compression component, a temperature control component, and a detection component. The compression component includes an upper pressure plate and a lower pressure plate spaced apart vertically. An upper pressure head is detachably mounted on the bottom of the upper pressure plate, and a lower pressure head is detachably mounted on the top of the lower pressure plate. The gap between the upper and lower pressure heads is used to clamp the test sample. The temperature control component includes an upper condensate channel inside the upper pressure head and a lower condensate channel inside the lower pressure head, as well as an upper heating sleeve and a lower heating sleeve respectively fitted around the upper and lower pressure heads. The lower end of the upper pressure head, the upper heating sleeve, the upper end of the lower pressure head, the lower heating sleeve, and the test sample are enclosed and surrounded by an insulation chamber covering the lower pressure plate. The detection assembly includes a displacement gauge and a displacement acquisition machine for measuring the deformation parameters of the test sample, and the displacement gauge and the displacement acquisition machine are connected by displacement sensing wires.

[0006] According to one example of this utility model, the upper condensate channel and the lower condensate channel are spiral channels or annular channels, and are respectively connected to an external water source through an upper condensate valve and a lower condensate valve.

[0007] According to one example of this utility model, the upper heating sleeve and the lower heating sleeve are resistance heating sleeves, which respectively tightly cover the outside of the upper pressure head and the lower pressure head, and are respectively connected to the temperature controller through the upper heating control wire and the lower heating control wire.

[0008] According to one example of the present invention, the temperature controller is connected to a thermocouple placed near the test sample via a temperature sensing wire, forming a closed-loop temperature control system.

[0009] According to one example of the present invention, the insulated chamber has a ceramic fiber outer shell.

[0010] According to one example of the present invention, the displacement gauge is a high-precision linear variable differential transformer or a laser displacement sensor, and the displacement gauge is fixed to an upper pressure plate or an independent bracket by a magnetic base or mechanical clamp.

[0011] According to one example of this utility model, the upper pressure head and the upper pressure plate are connected by a threaded or quick-release pin structure; the lower pressure head and the lower pressure plate are connected by a fixed connection or a positioning pin connection.

[0012] According to one example of the present invention, the heat preservation chamber adopts a split structure, including a chamber body disposed on a lower pressure plate and a chamber door that can be opened and closed by a hinge and installed on the chamber body. The joint between the chamber door and the chamber body is provided with a high-temperature resistant sealing strip, and the chamber body is also provided with wire through holes and observation windows.

[0013] According to one example of the present invention, the upper pressure plate and the lower pressure plate are connected in parallel by multiple screws, and the screws are provided with adjusting nuts for adjusting the distance between the upper pressure plate and the lower pressure plate.

[0014] The following benefits can be obtained by adopting this technical solution: (1) By integrating condensate channels inside the upper and lower pressure heads, and working together with the external heating jacket to form a bidirectional active temperature control system of "heating-cooling", the active temperature control mechanism greatly reduces the temperature lag of the system, and can stably control the temperature fluctuation of the test sample within a small range, so that the device can easily perform creep experiments under complex thermal conditions such as temperature cycling and step heating and cooling, which meets the urgent need for multi-scenario temperature change testing in advanced materials research.

[0015] (2) The structure is reasonably designed and highly versatile, which significantly improves the utilization rate and economy of the equipment. The initial distance between the upper and lower pressure plates can be precisely adjusted by rotating the adjusting nut on the screw. This design makes it extremely easy to clamp test samples of different heights, enhances the compatibility of the equipment with non-standard size samples, and improves the efficiency of experimental preparation.

[0016] (3) The rapid cooling capability directly shortens the cooling waiting time for a single experiment, while the convenient sample replacement function reduces the experimental interval. The combination of the two enables the device to complete more effective experiments per unit time, which is particularly suitable for material screening and process optimization research that requires a large number of parallel tests, and significantly saves time and manpower costs.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of the experimental apparatus for long-term compression creep of metallic materials according to this utility model.

[0020] The attached diagram is labeled as follows: 1. Upper pressure plate; 2. Lower pressure plate; 3. Upper pressure head; 4. Lower pressure head; 5. Test sample; 6. Upper condensate channel; 7. Lower condensate channel; 8. Upper heating jacket; 9. Lower heating jacket; 10. Insulation chamber; 11. Displacement gauge; 12. Displacement acquisition machine; 13. Displacement sensing wire; 14. Upper condensate valve; 15. Lower condensate valve; 16. Upper heating control wire; 17. Lower heating control wire; 18. Thermostat; 19. Temperature sensing wire; 20. Screw; 21. Adjusting nut. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Example

[0022] Please see Figure 1As shown, the device of this utility model integrates three major functional components. Among them, the compression component constitutes the mechanical skeleton of the device, which includes an upper pressure plate 1 and a lower pressure plate 2 arranged parallel to each other, and the two are connected by four high-strength screws 20 to form a stable rigid frame. An upper pressure head 3 is detachably installed at the bottom center of the upper pressure plate 1, and a lower pressure head 4 is detachably installed at the top center of the lower pressure plate 2. The test sample 5 is clamped between the upper pressure head 3 and the lower pressure head 4 to bear the axial compression load. The temperature control component is the core innovation of this utility model, which includes an upper condensate channel 6 embedded in the upper pressure head 3 and a lower condensate channel 7 embedded in the lower pressure head 4. At the same time, an upper heating sleeve 8 is tightly fitted on the outside of the upper pressure head 3, and a lower heating sleeve 9 is tightly fitted on the outside of the lower pressure head 4. An insulation chamber 10 is fixed on the lower pressure plate 2, completely covering the working ends of the upper pressure head 3 and the lower pressure head 4, the upper heating sleeve 8, the lower heating sleeve 9, and the test sample 5, forming a thermal field space isolated from the external environment. The detection assembly is used to accurately measure creep deformation. It includes a high-precision displacement gauge 11 (such as an LVDT or laser sensor) and a displacement acquisition unit 12, which are connected by displacement sensing wires 13. The displacement gauge 11 is usually fixed on the upper pressure plate 1 or on a separate independent bracket, and it is used to monitor the minute deformation of the sample 5 under load in real time.

[0023] The upper condensate channel 6 and the lower condensate channel 7 are preferably machined into spiral flow channels. This design maximizes the contact area between the coolant and the inside of the pressure head. The inlet of the upper condensate channel 6 is connected to the upper condensate valve 14 via a pipeline, and the lower condensate channel 7 is connected to the lower condensate valve 15. Both valves are then connected to an external cooling water source.

[0024] Compared to straight holes or simple annular grooves, spiral channels have extremely high heat exchange efficiency. When the temperature controller 18 commands cooling, the corresponding condensate valve opens, and the coolant flows in the spiral channel at a high flow rate, which can quickly and evenly remove the heat accumulated in the pressure head, achieving rapid and controllable cooling of the test sample 5, and solving the problem of low efficiency caused by relying on natural cooling in traditional devices.

[0025] The upper heating jacket 8 and lower heating jacket 9 can be industrial standard resistance heating jackets, which are tightly attached to the outer surfaces of the upper and lower pressure heads by high-temperature thermally conductive adhesive or mechanical clamping. The upper heating jacket 8 is connected to the output terminal of the temperature controller 18 via the upper heating control wire 16, and the lower heating jacket 9 is similarly connected to the temperature controller 18 via the lower heating control wire 17. The temperature controller 18 can output different power signals according to the set program to independently control the heat generation of the upper and lower heating jackets. Among them, the resistance heating jacket has fast thermal response and high control accuracy. Independent control of the upper and lower heating jackets helps to ensure the temperature uniformity at both ends of the test sample 5 and prevents temperature gradients caused by single-end heating. This design provides a reliable actuator for achieving rapid heating and precise temperature control.

[0026] The outer shell of the insulated chamber 10 can be made of ceramic fiber material. Ceramic fiber has excellent properties such as high temperature resistance, extremely low thermal conductivity, and small heat capacity. Using a ceramic fiber shell can minimize heat loss from the high-temperature experimental zone to the external environment, saving energy and, more importantly, effectively maintaining the stability of the thermal field inside the chamber, isolating the experiment from external temperature fluctuations, and ensuring the consistency of experimental conditions.

[0027] The displacement gauge 11 is preferably a high-precision linear variable differential transformer (LVDT), whose measurement accuracy can reach the micrometer level. During installation, it can be firmly attached to the clean surface of the upper pressure plate 1 using a magnetic base, or it can be installed on an independent bracket to avoid the deformation of the mounting bracket due to temperature changes affecting the measurement.

[0028] In this embodiment, the upper pressure head 3 and the upper pressure plate 1 can be connected by a threaded connection (e.g., the upper pressure head 3 has an external thread at the top, which is screwed into the threaded hole at the bottom of the upper pressure plate 1) or a quick-release pin structure (e.g., locked by a spring pin). The lower pressure head 4 and the lower pressure plate 2 can be fixedly connected by an interference fit, or positioned by a locating pin and then secured with screws.

[0029] As one of the optimized designs, the insulated chamber 10 adopts a split structure, including a chamber body fixedly mounted on the lower pressure plate 2, and a chamber door that can be opened and closed via hinges. High-temperature resistant silicone rubber or ceramic fiber sealing strips are embedded at the joint edge between the chamber door and the chamber body. Centralized wire passing holes are provided on the side wall of the chamber body for all control wires and sensor wires to pass through. In addition, an observation window covered with high-temperature resistant glass is also provided on the chamber door or chamber body.

[0030] The split design and hinged mechanism make opening the compartment and loading / unloading test samples more convenient. The sealing strip enhances insulation. Wiring perforations keep wiring neat and prevent heat leakage. The observation window allows researchers to directly observe the sample condition without interrupting the experiment or disrupting the thermal field, improving the monitorability and safety of the experiment.

[0031] When it is necessary to install test samples 5 at different heights, the position of the adjusting nut 21 on the screw 20 can be controlled to precisely adjust the distance between the upper pressure plate 1 and the lower pressure plate 2, thereby adjusting the test sample loading space between the upper pressure head 3 and the lower pressure head 4, enhancing the adaptability of the device to samples of different specifications and improving the versatility of the equipment.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0034] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be considered as covering all changes and modifications that encompass the true intent and scope of this utility model. Any and all equivalent scope and content within the scope of the claims should be considered as still falling within the intent and scope of this utility model.

Claims

1. A long-term compression creep test apparatus for metallic materials, characterized in that, Includes compression components, temperature control components, and detection components; The compression assembly includes an upper pressure plate (1) and a lower pressure plate (2) spaced apart vertically. An upper pressure head (3) is detachably installed at the bottom of the upper pressure plate (1), and a lower pressure head (4) is detachably installed at the top of the lower pressure plate (2). The gap between the upper pressure head (3) and the lower pressure head (4) is used to clamp the test sample (5). The temperature control component includes an upper condensate channel (6) inside the upper pressure head (3) and a lower condensate channel (7) inside the lower pressure head (4), as well as an upper heating sleeve (8) and a lower heating sleeve (9) respectively fitted outside the upper pressure head (3) and the lower pressure head (4). The lower end of the upper pressure head (3), the upper heating sleeve (8), the upper end of the lower pressure head (4), the lower heating sleeve (9) and the test sample (5) are enclosed by a heat insulation chamber (10) covering the lower pressure plate (2). The detection assembly includes a displacement gauge (11) and a displacement acquisition machine (12) for measuring the deformation parameters of the test sample (5), and the displacement gauge (11) and the displacement acquisition machine (12) are connected by a displacement sensing wire (13).

2. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The upper condensate channel (6) and the lower condensate channel (7) are spiral channels, and are respectively connected to the external water source through the upper condensate valve (14) and the lower condensate valve (15).

3. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The upper heating sleeve (8) and the lower heating sleeve (9) are resistance heating sleeves, which are respectively tightly wrapped around the upper pressure head (3) and the lower pressure head (4), and are respectively connected to the temperature controller (18) through the upper heating control wire (16) and the lower heating control wire (17).

4. The long-term compression creep test apparatus for metallic materials as described in claim 3, characterized in that, The temperature controller (18) is connected to a thermocouple located near the test sample (5) via a temperature sensing wire (19) to form a closed-loop temperature control system.

5. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The insulated chamber (10) has a ceramic fiber shell.

6. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The displacement gauge (11) is a high-precision linear variable differential transformer or laser displacement sensor. The displacement gauge (11) is fixed on the upper pressure plate (1) or an independent bracket by a magnetic base or mechanical clamp.

7. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The upper pressure head (3) is connected to the upper pressure plate (1) by a threaded structure or a quick-release pin structure; the lower pressure head (4) is fixedly connected to the lower pressure plate (2) or connected by a positioning pin.

8. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The insulated chamber (10) adopts a split structure, including a chamber body set on the lower pressure plate (2) and a chamber door that can be opened and closed by a hinge. The joint between the chamber door and the chamber body is provided with a high-temperature resistant sealing strip. The chamber body is also provided with wire through holes and observation windows.

9. The long-term compression creep test apparatus for metallic materials as described in claim 1, characterized in that, The upper pressure plate (1) and the lower pressure plate (2) are connected in parallel by multiple screws (20), and the screws (20) are provided with adjusting nuts (21) for adjusting the distance between the upper pressure plate (1) and the lower pressure plate (2).

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