Fatigue test fixture and equipment

Abstract

The utility model discloses a fatigue test fixture and equipment, including a first clamp assembly and a second clamp assembly, the first clamp assembly moves along a first direction, the first clamp assembly includes a first clamp seat and a first sample fixing table, the first sample fixing table is installed on the first clamp seat through a first rotating shaft, and the second clamp assembly is installed on the second clamp seat through a second rotating shaft. The second clamp assembly comprises a second clamp seat, the second clamp seat is mounted on the base, a force sensor is arranged between the second clamp seat and the base, and the second clamp seat is provided with a second sample fixing table and a third sample fixing table; the first sample fixing table and the second sample fixing table can limit a test sample between the first clamp assembly and the second clamp assembly in the first direction, and the first sample fixing table and the third sample fixing table can limit the test sample between the first clamp assembly and the second clamp assembly in the second direction. According to the utility model, the test sample can be tested in two fatigue test modes, namely single tensile fatigue and plane bending fatigue.

Description

Technical Field

[0001] The utility model is used in the field of fatigue testing equipment, in particular to a fatigue testing jig and equipment. Background Art

[0002] Obtaining the fatigue life of materials is a basic requirement for the use of mechanical parts. Understanding the fatigue strength of materials can predict the service life of materials and help determine the safe use cycle and maintenance cycle of products, thereby ensuring the safe use of products.

[0003] Most of the existing fatigue testing equipment has single fatigue testing function. For example, single tensile fatigue and plane bending fatigue are realized by two different devices. In addition, the existing equipment is relatively large and expensive to invest in, and cannot meet the measurement requirements of fatigue strength under different stress modes. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a fatigue test fixture and equipment.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] In a first aspect, a fatigue test fixture includes a first clamp assembly and a second clamp assembly, wherein the first clamp assembly can be connected to an actuator and can move along a first direction under the action of the actuator, the first clamp assembly includes a first clamp seat and a first sample fixing table for fixing a first end of a test sample, the first sample fixing table is installed on the first clamp seat through a first rotating shaft, the second clamp assembly includes a second clamp seat, the second clamp seat is installed on a base, a force sensor is provided between the second clamp seat and the base, the second clamp seat is provided with a second sample fixing table and a third sample fixing table for fixing a second end of the test sample, the first sample fixing table and the second sample fixing table can confine the test sample between the first clamp assembly and the second clamp assembly along the first direction, and the first sample fixing table and the third sample fixing table can confine the test sample between the first clamp assembly and the second clamp assembly along the second direction.

[0007] In combination with the first aspect, in some implementations of the first aspect, the first direction is perpendicular to the second direction.

[0008] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the first fixture seat has a first connecting end and a second connecting end, the first connecting end is connected to the first sample fixing table through a first rotating shaft, and the second connecting end is connected to the mounting shaft through a second rotating shaft.

[0009] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the first fixture seat includes a first end plate and a second end plate, the middle parts of the first end plate and the second end plate are connected by a connecting plate, the first fixture seat is H-shaped, and a first rotating shaft seat and a second rotating shaft seat are formed between the first end plate and the second end plate on both sides of the connecting plate, the first rotating shaft seat is provided with relative first axial holes, the middle part of the first rotating shaft is fixedly connected to the first sample fixing table, the two ends of the first rotating shaft are installed in the first axial holes through bearings, the second rotating shaft seat is provided with relative second axial holes, the middle part of the second rotating shaft is fixedly connected to the mounting shaft, and the two ends of the second rotating shaft are installed in the second axial holes through bearings.

[0010] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the first axial hole and the second axial hole are both through holes, and the first end plate and the second end plate are provided with baffles that close the through holes from the outside.

[0011] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the first sample fixing table is provided with a first sample fixing pressing plate for fixing the test sample.

[0012] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the second fixture seat is L-shaped, the first end surface of the second fixture seat forms a second sample fixing platform parallel to the first direction, and the second end surface of the second fixture seat forms a third sample fixing platform parallel to the second direction.

[0013] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the second sample fixing station is provided with a second sample fixing pressure plate for fixing the test sample, and the third sample fixing station is provided with a third sample fixing pressure plate for fixing the test sample.

[0014] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a calibration test piece is also included, wherein the calibration test piece has a first end that can be connected to the first sample fixing table and a second end that can be connected to the second sample fixing table or the third sample fixing table.

[0015] In a second aspect, a fatigue test device comprises the fatigue test fixture described in any implementation of the first aspect.

[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: The technical solution of the utility model can test the test sample in two fatigue test modes, namely, single tensile fatigue and plane bending fatigue. When performing a plane bending fatigue test, the two ends of the test sample are connected to the first sample fixing table and the third sample fixing table, and the fatigue test fixture forms a cantilever beam structure fixture, which can be used to carry out a plane bending fatigue test. When performing a tensile fatigue test, the two ends of the test sample are connected to the first sample fixing table and the second sample fixing table, and the fatigue test fixture forms a single tensile fatigue fixture, which can be used to carry out a tensile fatigue test. Ultimately, the strength measurement needs of the material bending stress mode state are solved, and then the fatigue curve is obtained for part material reliability analysis.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is an axonometric diagram of an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 A front view of an embodiment is shown. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0022] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0025] in, Figure 2 The reference direction coordinate system of the embodiment of the utility model is given below. Figure 2 The embodiment of the utility model is described with reference to the direction shown.

[0026] See also Figure 1 , Figure 2The embodiment of the utility model provides a fatigue test fixture, including a first clamp assembly 100 and a second clamp assembly 200. The first clamp assembly 100 can be connected to an actuator and can move along a first direction under the action of the actuator. The first clamp assembly 100 includes a first clamp seat 101 and a first sample fixing table 102 for fixing the first end of the test sample 300. The first sample fixing table 102 is installed on the first clamp seat 101 through a first rotating shaft 103. The first sample fixing table 102 can rotate around the first rotating shaft 103 according to the specific mode of the fatigue test to adjust the direction, for example, to make the fixed test sample 300 along the first direction to perform a tensile fatigue test. The second clamp assembly 200 includes a second clamp seat 201, which is installed on a base 400. A force sensor 500 is provided between the second clamp seat 201 and the base 400. The force sensor 500 is used to detect stress parameters during the test. The second fixture seat 201 is provided with a second sample fixing platform 202 and a third sample fixing platform 203 for fixing the second end of the test sample 300. The first sample fixing platform 102 and the second sample fixing platform 202 can limit the test sample 300 between the first fixture assembly 100 and the second fixture assembly 200 along the first direction. The first sample fixing platform 102 and the third sample fixing platform 203 can limit the test sample 300 between the first fixture assembly 100 and the second fixture assembly 200 along the second direction. The technical solution of the utility model can provide two installation postures for the test sample, so as to perform tensile fatigue and plane bending fatigue tests.

[0027] Combination Figure 1 , Figure 2 The technical solution of the utility model can test the test sample 300 in two fatigue test modes, namely, single tensile fatigue and plane bending fatigue. When performing a plane bending fatigue test, the two ends of the test sample 300 are connected to the first sample fixing table 102 and the third sample fixing table 203, and the fatigue test fixture forms a cantilever beam structure fixture, which can be used to carry out a plane bending fatigue test. When performing a tensile fatigue test, the two ends of the test sample 300 are connected to the first sample fixing table 102 and the second sample fixing table 202, and the fatigue test fixture forms a single tensile fatigue fixture, which can be used to carry out a tensile fatigue test. Ultimately, the strength measurement needs of the material bending stress mode state are solved, and then the fatigue curve is obtained for part material reliability analysis.

[0028] In some embodiments, the first direction is perpendicular to the second direction, for example Figure 2 In the figure, the up-down direction is the first direction, and the left-right direction is the second direction, so as to complete the tensile fatigue and plane bending fatigue tests on the test sample 300.

[0029] In some embodiments, see Figure 1 , Figure 2 The first fixture seat 101 has a first connection end and a second connection end, the first connection end is connected to the first sample fixing platform 102 through a first rotating shaft 103, and the second connection end is connected to the installation shaft 105 through a second rotating shaft 104. The installation shaft 105 is used to connect the device actuator and moves along the first direction under the drive of the actuator to realize test loading.

[0030] In some embodiments, see Figure 1 , Figure 2 The first fixture seat 101 includes a first end plate 106 and a second end plate 107, and the middle parts of the first end plate 106 and the second end plate 107 are connected by a connecting plate 108. The first fixture seat 101 is H-shaped. The first fixture seat 101 is made as a whole or multiple parts are assembled into a whole. A first rotating shaft 103 seat and a second rotating shaft 104 seat are formed between the first end plate 106 and the second end plate 107 on both sides of the connecting plate 108. The first rotating shaft 103 seat is provided with a relative first axial hole, and the middle part of the first rotating shaft 103 is fixedly connected to the first sample fixing table 102. Both ends of the first rotating shaft 103 are installed in the first axial hole through bearings, and the second rotating shaft 104 seat is provided with a relative second axial hole, and the middle part of the second rotating shaft 104 is fixedly connected to the mounting shaft 105, and both ends of the second rotating shaft 104 are installed in the second axial hole through bearings. The first fixture seat 101 is H-shaped and has balanced force. Combined with the hinged connection at both ends of the first fixture seat 101, it is easier to control the transmission and direction of the force on the test sample 300.

[0031] For further information, see Figure 1 , Figure 2 The first shaft hole and the second shaft hole are both through holes. The first end plate 106 and the second end plate 107 are provided with a baffle 109 for closing the through holes from the outside. The baffle 109 is installed on the first end plate 106 and the second end plate 107 by screws, which is convenient for disassembly and assembly and can also limit the axial position of the rotating shaft.

[0032] The test sample 300 can be fixed to the first sample fixing platform 102 by bonding, clamping, etc. For example, in some embodiments, see Figure 1 The first sample fixing platform 102 is provided with a first sample fixing pressure plate 110 for fixing the test sample 300. The first sample fixing pressure plate 110 is connected to the first sample fixing platform 102 by screws. By adjusting the screws, the gap between the first sample fixing pressure plate 110 and the first sample fixing platform 102 can be adjusted, thereby achieving the clamping and fixing of the test sample 300. Before the sample is installed, the first sample fixing pressure plate 110 does not need to be installed on the first sample fixing platform 102. In this embodiment, the fixing method of using screws in combination with the fixing pressure plate can ensure the stable clamping of the test sample 300 during the fatigue test process.

[0033] In some embodiments, see Figure 1, Figure 2 The second fixture seat 201 is L-shaped, with one end extending to the bottom of the first fixture seat 101 and the other end extending to the left side of the first fixture seat 101. The first end surface of the second fixture seat 201 forms a second sample fixing platform 202 parallel to the first direction, and the second end surface of the second fixture seat 201 forms a third sample fixing platform 203 parallel to the second direction. The L-shaped second fixture seat 201 provides space for the first fixture assembly 100 to move along the first direction, and also directly forms the second sample fixing platform 202 and the third sample fixing platform 203 for fixing the test sample 300 through the end surfaces at both ends.

[0034] The test sample 300 can be fixed to the first sample fixing platform 102 by bonding, clamping, etc. For example, in some embodiments, see Figure 1 , Figure 2 The second sample fixing platform 202 is provided with a second sample fixing pressure plate 204 for fixing the test sample 300, and the third sample fixing platform 203 is provided with a third sample fixing pressure plate 205 for fixing the test sample 300. The second sample fixing pressure plate 204 is connected to the second sample fixing platform 202 by screws, and the third sample fixing pressure plate 205 is connected to the third sample fixing platform 203 by screws. By adjusting the screws, the gap between the second sample fixing pressure plate 204 and the second sample fixing platform 202 can be adjusted, and the gap between the third sample fixing pressure plate 205 and the third sample fixing platform 203 can be adjusted, so as to achieve the clamping and fixing of the test sample 300. Before the sample is installed, the second sample fixing pressure plate 204 does not need to be installed on the second sample fixing platform 202, and the third sample fixing pressure plate 205 does not need to be installed on the third sample fixing platform 203. In this embodiment, the fixing method of using screws and fixing pressure plates can ensure the stable clamping of the test sample 300 during the fatigue test.

[0035] In some embodiments, the fatigue test fixture also includes a calibration test piece, which has a first end that can be connected to the first sample fixing table 102 and a second end that can be connected to the second sample fixing table 202 or the third sample fixing table 203. During the test process, for example, when performing plane bending fatigue, the distance between the first fixture assembly 100 and the second fixture assembly 200 is adjusted, and the calibration test piece is installed so that the test piece is in a horizontal and stress-free state. After that, the calibration test piece can be replaced, the sample to be tested can be installed, and the fatigue test can be carried out. The calibration test piece can be used to make the relative position of the first fixture assembly 100 and the second fixture assembly 200 meet the clamping requirements, avoid internal stress in the sample due to clamping, and ultimately effectively ensure that the test results are more accurate.

[0036] An embodiment of the utility model further provides a fatigue test device, comprising the fatigue test fixture of any of the above embodiments.

[0037] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A fatigue test fixture, characterized in that: The invention comprises a first clamp assembly and a second clamp assembly, wherein the first clamp assembly can be connected to an actuator and can move along a first direction under the action of the actuator, the first clamp assembly comprises a first clamp seat and a first sample fixing platform for fixing a first end of a test sample, the first sample fixing platform is installed on the first clamp seat through a first rotating shaft, the second clamp assembly comprises a second clamp seat, the second clamp seat is installed on a base, a force sensor is provided between the second clamp seat and the base, the second clamp seat is provided with a second sample fixing platform and a third sample fixing platform for fixing a second end of the test sample, the first sample fixing platform and the second sample fixing platform can confine the test sample between the first clamp assembly and the second clamp assembly along the first direction, and the first sample fixing platform and the third sample fixing platform can confine the test sample between the first clamp assembly and the second clamp assembly along the second direction.

2. The fatigue test fixture according to claim 1, characterized in that: The first direction is perpendicular to the second direction.

3. The fatigue test fixture according to claim 1, characterized in that: The first fixture seat has a first connecting end and a second connecting end, the first connecting end is connected to the first sample fixing platform through a first rotating shaft, and the second connecting end is connected to the mounting shaft through a second rotating shaft.

4. The fatigue test fixture according to claim 3, characterized in that: The first fixture seat includes a first end plate and a second end plate, the middle parts of the first end plate and the second end plate are connected by a connecting plate, the first fixture seat is H-shaped, and a first rotating shaft seat and a second rotating shaft seat are formed between the first end plate and the second end plate on both sides of the connecting plate, the first rotating shaft seat is provided with relative first axial holes, the middle part of the first rotating shaft is fixedly connected to the first sample fixing table, the two ends of the first rotating shaft are installed in the first axial holes through bearings, the second rotating shaft seat is provided with relative second axial holes, the middle part of the second rotating shaft is fixedly connected to the mounting shaft, and the two ends of the second rotating shaft are installed in the second axial holes through bearings.

5. The fatigue test fixture according to claim 4, characterized in that: The first axial hole and the second axial hole are both through holes, and the first end plate and the second end plate are provided with baffles for closing the through holes from the outside.

6. The fatigue test fixture according to claim 1, characterized in that: The first sample fixing platform is provided with a first sample fixing pressing plate for fixing the test sample.

7. The fatigue test fixture according to claim 1, characterized in that: The second fixture seat is L-shaped, a first end surface of the second fixture seat forms a second sample fixing platform parallel to the first direction, and a second end surface of the second fixture seat forms a third sample fixing platform parallel to the second direction.

8. The fatigue test fixture according to claim 7, characterized in that: The second sample fixing platform is provided with a second sample fixing pressing plate for fixing the test sample, and the third sample fixing platform is provided with a third sample fixing pressing plate for fixing the test sample.

9. The fatigue test fixture according to claim 1, characterized in that: The device also includes a calibration test piece having a first end connectable to the first sample fixing stage and a second end connectable to the second sample fixing stage or the third sample fixing stage.

10. A fatigue testing device, characterized in that: A fatigue test jig comprising any one of claims 1 to 9.

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