High-temperature low-cycle fatigue test device for tiny plate-shaped structure

Abstract

The utility model discloses a high-temperature low-cycle fatigue test device for a tiny plate-shaped structure, which relates to the field of low-cycle fatigue performance detection of metal materials and comprises a lower threaded clamp and an upper threaded clamp, a notch is formed in one side of the top of the lower threaded clamp, and an external threaded seat is fixedly mounted in the center of the bottom of the lower threaded clamp. A cylindrical rod is inserted into the position, located in the outer threaded base, of the bottom of the lower threaded clamp, and a containing groove is formed in the inner wall of the notch. According to the high-temperature low-cycle fatigue test device for the tiny plate-shaped structure, a tool designed in the prior art is suitable for testing rod-shaped materials with the diameter being 5 mm or above, along with rapid development of the aerospace technology, the requirement for testing the tiny structure is more and more, and the requirement cannot be met by the existing tool design; the special tool for mounting the micro plate-shaped structure material sample is designed, so that the high-temperature low-cycle fatigue test requirement of a high-precision micro structure material can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of metal material low cycle fatigue performance detection, especially relates to a high temperature low cycle fatigue test device for micro plate structure. BACKGROUND

[0002] With the rapid development and leap-forward progress of aerospace technology, the spacecraft becomes the object that many countries' aerospace departments focus on developing in recent years, and the key materials of various components on the spacecraft usually have the characteristics of small size and high precision, and advanced aerospace vehicles rely more on the detection and research and development of micro size structural parts.

[0003] High-precision micro structure materials are widely used in aerospace, automobile manufacturing and other lightweight engineering due to their light weight and high strength. However, their detection application is limited due to their small size, which makes it difficult to sample and detect.

[0004] Under normal circumstances, the conventional aviation metal material is processed and taken out for detection, and the parallel section part has a diameter greater than or equal to 5mm, and the clamping end has a diameter twice that of the parallel section, i.e. 10mm. However, some high-precision micro structure materials have a thickness of only 2mm, which cannot be normally sampled and processed. Therefore, a plate-shaped sample is used for sampling, and a special tool is designed for installing the special plate-shaped material to enable metal detection test.

[0005] The performance research of high-precision micro structure materials cannot be separated from the support of various detection technologies. Low cycle fatigue test is a process in which local permanent cumulative damage is gradually produced at one or several places under the action of cyclic stress and strain, and cracks or complete fracture occurs suddenly after a certain number of cycles. The stress level acting on the parts and components is high, and the damage cycle is generally lower than 10^3-10^4 fatigue, such as the fatigue of pressure vessels, gas turbine parts, etc. With the development of high-precision micro structure materials, the precision of material structure is continuously improved, and the structure size is also getting smaller. The conventional test metal high-temperature alloy tool cannot meet the test requirements of the test below 5mm in diameter. It is necessary to develop and design a test tool with smaller size and higher precision to meet the testing requirements of micro structure samples.

[0006] Therefore, a tool specially used for installing micro structure material samples is designed. INVENTION CONTENTS

[0007] The main purpose of the utility model is to provide a high-temperature low-cycle fatigue test device for micro plate structure, which can effectively solve the technical problem that with the development of high-precision micro structure materials, the precision of material structure is continuously improved, the structure size is also getting smaller, and the conventional test metal high-temperature alloy tool cannot meet the test requirements below 5mm in diameter.

[0008] To achieve the above object, the technical scheme adopted by the utility model is:

[0009] A high-temperature low-cycle fatigue test device for micro-plate structure, comprising a lower threaded clamp and an upper threaded clamp, a notch is formed on one side of the top of the lower threaded clamp, and an external threaded seat is fixedly installed at the bottom center position of the lower threaded clamp, a cylindrical rod is inserted into the inside of the external threaded seat at the bottom of the lower threaded clamp, a placing groove is formed on the inner wall of the notch, a structure sample is placed in the inside of the placing groove, and a baffle is threadedly connected to the notch through two bolts, and a gasket is arranged between the baffle and the structure sample.

[0010] As a further scheme of the utility model, the lower threaded clamp and the upper threaded clamp are symmetrically arranged, and the structure sample is connected between the lower threaded clamp and the upper threaded clamp.

[0011] As a further scheme of the utility model, the upper part of the lower threaded clamp and the lower part of the upper threaded clamp are both hexagonally arranged.

[0012] As a further scheme of the utility model, the placing groove is T-shaped, and the placing groove is in communication with a cylindrical groove adapted to the cylindrical rod.

[0013] As a further scheme of the utility model, the gasket is T-shaped, and the total thickness of the gasket and the structure sample is greater than the depth of the placing groove.

[0014] As a further scheme of the utility model, the baffle is adapted to the size of the notch.

[0015] The utility model has the advantages as follows:

[0016] 1. The tooling designed in the prior art is suitable for testing rod-shaped material with a diameter of more than 5 mm. With the rapid development of aerospace technology, the demand for micro-structure testing is also increasing. The current tooling design cannot meet this demand. The patent designs a tooling specially used for installing micro-plate structure material samples, which can meet the high-temperature low-cycle fatigue test demand for high-precision micro-structure material.

[0017] 2. The patent redesigns the fixing structure of the sample, which can make the connection between the micro-plate sample and the tooling part more stable and tight, and also increase the stability of the sample after installation.

[0018] 3. The tooling redesigned in the patent increases the special gasket and the ejector rod to enhance the stability of the sample in the axial direction and the accuracy of the experimental data. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1This is a schematic diagram of the overall structure of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to the present invention.

[0020] Figure 2 This is a side view of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to the present invention.

[0021] Figure 3 This is a front view of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to the present invention.

[0022] Figure 4 This is a structural diagram of the threaded clamp of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to this utility model;

[0023] Figure 5 This is a three-dimensional view of the structural specimen of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to the present invention.

[0024] Figure 6 This is a perspective view of the baffle of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to the present invention;

[0025] Figure 7 This is a three-dimensional view of the pad block of a high-temperature low-cycle fatigue testing device for a micro-plate structure according to this utility model.

[0026] In the figure: 1. Lower threaded clamp; 2. Notch; 3. Cylindrical rod; 4. External threaded seat; 5. Baffle; 6. Bolt; 7. Spacer; 8. Structural sample. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Combination Figures 1-7 A high-temperature low-cycle fatigue testing device for a small plate-like structure includes a lower threaded clamp 1 and an upper threaded clamp. A notch 2 is provided on one side of the top of the lower threaded clamp 1, and an external threaded seat 4 is fixedly installed at the center of the bottom of the lower threaded clamp 1. A cylindrical rod 3 is inserted into the bottom of the lower threaded clamp 1 inside the external threaded seat 4. A placement groove is provided on the inner wall of the notch 2, and a structural specimen 8 is placed inside the placement groove. A baffle 5 is threadedly connected to the notch 2 by two bolts 6, and a pad 7 is provided between the baffle 5 and the structural specimen 8.

[0029] In this embodiment, the lower threaded clamp 1 and the upper threaded clamp are symmetrically arranged, and the structural sample 8 is connected between the lower threaded clamp 1 and the upper threaded clamp.

[0030] In this embodiment, the upper part of the lower threaded clamp 1 and the lower part of the upper threaded clamp are both hexagonal. The hexagonal shape makes it easy to rotate by an external wrench.

[0031] In this embodiment, the placement groove is T-shaped and is connected to the cylindrical groove of the adapting cylindrical rod 3. The T-shaped placement groove facilitates the adaptation of the structural sample 8.

[0032] In this embodiment, the pads 7 are arranged in a T-shape, and the total thickness of the pads 7 and the structural sample 8 is greater than the depth of the placement groove. Since the total thickness of the pads 7 and the structural sample 8 is greater than the depth of the placement groove, the baffle 5 can contact the pads 7 during installation, thereby pressing the structural sample 7 tightly through the pads 7.

[0033] In this embodiment, the baffle 5 and the notch 2 are size-matched, and the matched structure looks more aesthetically pleasing.

[0034] It should be noted that this utility model is a high-temperature low-cycle fatigue testing device for micro plate-shaped structures. In use, the lower threaded clamp 1 and the upper threaded clamp are laid flat, and one side of the micro structure specimen 8 is placed in the placement groove at the notch 2. Then, the cylindrical rod 3 is inserted into the central vertical hole of the external thread seat 4 to tighten the specimen vertically. Then, the pad 7 is completely placed into the same placement groove. Subsequently, the baffle 5 is installed with two bolts 6 to ensure that the structural specimen 8 will not fall out of the placement groove. Finally, the connected whole is installed on the testing machine. The entire tooling is installed, ensuring a tight connection between the specimen and the tooling.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-temperature low-cycle fatigue testing device for micro-plate structures, comprising a lower threaded clamp (1) and an upper threaded clamp, characterized in that: The lower threaded clamp (1) has a notch (2) on one side of the top, and an external threaded seat (4) is fixedly installed at the center of the bottom of the lower threaded clamp (1). A cylindrical rod (3) is inserted inside the external threaded seat (4) at the bottom of the lower threaded clamp (1). A placement groove is provided on the inner wall of the notch (2). A structural sample (8) is placed inside the placement groove. A baffle (5) is threadedly connected to the notch (2) by two bolts (6). A pad (7) is provided between the baffle (5) and the structural sample (8).

2. The high-temperature low-cycle fatigue testing device for micro-plate structures according to claim 1, characterized in that: The lower threaded clamp (1) and the upper threaded clamp are symmetrically arranged, and the structural sample (8) is connected between the lower threaded clamp (1) and the upper threaded clamp.

3. The high-temperature low-cycle fatigue testing device for microplate structures according to claim 1, characterized in that: The upper part of the lower threaded clamp (1) and the lower part of the upper threaded clamp are both hexagonal.

4. The high-temperature low-cycle fatigue testing device for microplate structures according to claim 1, characterized in that: The placement slot is T-shaped and is connected to the cylindrical slot of the fitting cylindrical rod (3).

5. The high-temperature low-cycle fatigue testing device for microplate structures according to claim 1, characterized in that: The pads (7) are arranged in a T-shape, and the total thickness of the pads (7) and the structural specimen (8) is greater than the depth of the placement groove.

6. The high-temperature low-cycle fatigue testing device for microplate structures according to claim 1, characterized in that: The baffle (5) is sized to match the notch (2).

Images