Fatigue test system with lateral stress load

Abstract

The invention provides a fatigue test system with lateral stress load, which comprises a lower fixing seat, an upper fixing seat and a horizontal push rod, the upper fixing seat and the lower fixing seat clamp the upper end and the lower end of a to-be-tested piece, and the horizontal push rod is horizontally arranged between the upper fixing seat and the lower fixing seat. And the push rod can move along the horizontal direction and is in contact with the middle part of the to-be-tested piece so as to apply a horizontal push force to the to-be-tested piece, and the magnitude of the push force is obtained through the pressure sensor. According to the fatigue test system with the lateral stress load provided by the invention, the load in the horizontal direction is applied to the to-be-tested piece through the horizontal push rod which is in contact with the to-be-tested piece in the horizontal transverse direction, and the thrust is obtained through the pressure sensor, so that the horizontal transverse load is continuously applied in the fatigue test process; fatigue test data under the lateral stress load condition are obtained, and the fatigue life under the complex stress condition can be simulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fatigue test, in particular to a fatigue test system with lateral stress load. BACKGROUND

[0002] The conventional fatigue test system is for axial tension and compression fatigue test of fatigue test piece, and no transverse stress load is applied in the test process, so that the test result is single direction fatigue data.

[0003] In actual application process, any material cannot bear only one direction of tensile stress or compressive stress. However, the current fatigue test system cannot apply stress load in other directions during the fatigue test, especially the transverse (that is, the lateral direction of the test piece) load. Obviously, in actual life, the fatigue test result of the test piece under the load condition needs to be obtained, which can meet more needs under different use conditions. SUMMARY

[0004] The technical problem to be solved by the embodiments of the present application is to provide a fatigue test system with lateral stress load, which solves the problem that the existing fatigue test equipment cannot obtain fatigue test results under the condition of applying lateral stress.

[0005] In order to solve the above technical problem, the present application provides a fatigue test system with lateral stress load, which comprises a lower fixed seat (11), an upper fixed seat (12) and a horizontal push rod (50), the upper fixed seat (12) and the lower fixed seat (11) clamping the upper and lower ends of the test piece (10), the horizontal push rod (50) is horizontally arranged between the upper fixed seat (12) and the lower fixed seat (11), and can move along the horizontal direction and contact the middle part of the test piece (10), so as to apply horizontal pushing force to the test piece (10), and the size of the pushing force is obtained through the pressure sensor.

[0006] The horizontal push rod (50) is connected with the structure fixed in the lower fixed seat (11) and the upper fixed seat (12), so that the height of the horizontal push rod (50) is unchanged relative to the structure.

[0007] Taking the lower fixed seat (11) as an example, the fatigue test system further comprises: The saddle (20), the fixed guide frame (30), the double guide rod driving assembly (40) and the thrust measurement module, wherein the saddle (20) is sleeved on the lower fixed seat (11), and the side of the saddle (20) is a vertical fixed surface, so as to be fixedly connected with the fixed guide frame (30); the fixed guide frame (30) is a square frame structure arranged horizontally, and the height of the main body part of the fixed guide frame (30) corresponds to the position between the upper fixed seat (12) and the lower fixed seat (11); the double guide rod driving assembly (40) is connected on the fixed guide frame (30), and is used for driving the horizontal push rod (50) to move along the horizontal direction; the thrust measurement module is used for indirectly measuring the stress between the horizontal push rod (50) and the test piece (10). When the upper fixed seat (12) is fixed, the saddle (20) is connected on the upper fixed seat (12).

[0008] The saddle (20) comprises a U-shaped seat (21) and a fixed side plate (22), the groove diameter of the U-shaped seat (21) is matched with the column diameter of the lower fixed seat (11); the side fixed plate (22) is connected on the side of the U-shaped seat (21) to fix the U-shaped seat (21) on the column of the lower fixed seat (11).

[0009] The fixed guide frame (30) comprises a fixed support plate (31), two guide optical axes (32) and a guide support plate (33), wherein the two guide optical axes (32) are arranged in parallel from top to bottom, the guide support plate (33) is fixedly connected with the fixed support plate (31) through the two guide optical axes (32), forming a rectangular frame structure; wherein the two guide optical axes (32) are both directed to the test piece (10); the height position of the fixed support plate (31) relative to the side fixed plate (22) is adjustable, so that the contact position of the horizontal push rod (50) driven by the double guide rod driving assembly (40) with the test piece (10) is adjustable, so as to obtain the fatigue test data of the lateral stress load of the test piece (10) under different contact positions.

[0010] The double-guide-rod driving assembly (40) comprises a threaded driving rod (41), a vertical driving plate (42), a horizontal pushing plate (43), a balance spring (44), and two sliding guide rods (45), wherein the threaded driving rod (41) is threadedly connected to the symmetry axis of the two guide light axes (32) of the guide support plate (33); the vertical driving plate (42) is vertically arranged and slidably connected to the upper and lower guide light axes (32), and the front end of the threaded driving rod (41) abuts against the middle position of the vertical driving plate (42); the two sliding guide rods (45) are horizontally arranged and symmetrically located on the two sides of the center plane of the two guide light axes (32), the rear end of the sliding guide rod (45) is fixedly connected with the horizontal pushing plate (43), the two sliding guide rods (45) slidably pass through the sliding shaft holes in the fixed support plate (31), each balance spring (44) is sleeved on the sliding guide rod (45) and located between the fixed support plate (31) and the horizontal pushing plate (43); the vertical driving plate (42) abuts against the horizontal pushing plate (43) through a first pressure sensor (40a), and each balance spring (44) is connected with the horizontal pushing plate (43) or the fixed support plate (31) through a second pressure sensor; the front end of the two sliding guide rods (45) is connected with the horizontal pushing rod (50); the first pressure sensor (40a) and the two second pressure sensors form a thrust measuring module, and the thrust measuring module obtains the stress between the horizontal pushing rod (50) and the test piece (10) by calculating the pressure difference F1-F2-F3 of the pressure F1 obtained by the first pressure sensor (40a) and the pressures F2 and F3 obtained by the two second pressure sensors.

[0011] The two guide light axes (32), the two sliding guide rods (45), and the threaded driving rod (41) form a positive cross-shaped symmetric structure in space, that is, the threaded driving rod (41) is located at the center of the two guide light axes (32) in the vertical direction and at the center of the two sliding guide rods (45) in the horizontal direction.

[0012] The rear end of the threaded driving rod (41) is provided with a driving handle (46), the driving handle (46) is connected with a servo driving motor, and the servo driving motor is used for controlling the rotation of the driving handle (46) according to the pressure difference F1-F2-F3 obtained by the thrust measuring module, so as to make the threaded driving rod (41) advance or retreat.

[0013] The front end of the threaded driving rod (41) is connected with the vertical driving plate (42) through a rotating bearing.

[0014] The front end of the sliding guide rod (45) is connected with the test piece (10) through an adapter.

[0015] The adapter comprises a first docking block (47) and a second docking block (48), which form a circular hole after docking to connect with the horizontal push rod (50), wherein the rear end of the first docking block (47) is fixedly connected with the front end of the sliding rod (45).

[0016] The fatigue test system with lateral stress load provided by the application can simulate the fatigue life under complex stress conditions by continuously applying horizontal lateral load in the fatigue test process to obtain fatigue test data under lateral stress load. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure diagram of the fatigue test system with lateral stress load is shown.

[0018] Figure 2 The structure diagram of the fatigue test system with lateral stress load is shown. Figure 1 The corresponding sectional view is shown.

[0019] Figure 3 The structure diagram of the fatigue test system with lateral stress load is shown. Figure 1 The corresponding side view is shown. DETAILED DESCRIPTION

[0020] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein without departing from the spirit and scope of the present application, and those skilled in the art can make similar modifications without departing from the spirit and scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely used for the purpose of illustration.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] As shown in the accompanying drawings, the present application provides a fatigue test system with lateral stress load, comprising a lower fixed seat 11, an upper fixed seat 12 and a horizontal push rod 50, the upper fixed seat 12 and the lower fixed seat 11 clamping the upper and lower ends of the test piece 10, the horizontal push rod 50 horizontally arranged between the upper fixed seat 12 and the lower fixed seat 11, and capable of moving along the horizontal direction and contacting the middle part of the test piece 10 to apply a horizontal pushing force to the test piece 10, and obtaining the size of the pushing force through a pressure sensor. Figures 1-3

[0024] The horizontal push rod 50 is connected with the structure which is fixed between the lower fixed seat 11 and the upper fixed seat 12, so that the height of the horizontal push rod 50 is constant relative to the structure.

[0025] Taking the lower fixed seat 11 as an example, the fatigue test system further comprises: a saddle 20, a fixed guide frame 30, a double guide rod driving assembly 40 and a push force measuring module, wherein the saddle 20 is sleeved on the lower fixed seat 11, and the side surface of the saddle 20 is a vertical fixed surface to be fixedly connected with the fixed guide frame 30; the fixed guide frame 30 is a horizontally arranged square frame structure, and the height of the main body part of the fixed guide frame 30 corresponds to the position between the upper fixed seat 12 and the lower fixed seat 11; the double guide rod driving assembly 40 is connected with the fixed guide frame 30 for driving the horizontal push rod 50 to move along the horizontal direction; and the push force measuring module is used for indirectly measuring the stress between the horizontal push rod 50 and the test piece 10. When the upper fixed seat 12 is fixed, the saddle 20 is connected with the upper fixed seat 12.

[0026] The saddle 20 comprises a U-shaped seat 21 and a fixed side plate 22, the groove diameter of the U-shaped seat 21 is matched with the column diameter of the lower fixed seat 11; and the side fixed plate 22 is connected with the side surface of the U-shaped seat 21 to fix the U-shaped seat 21 on the column of the lower fixed seat 11.

[0027] The fixed guide frame 30 comprises a fixed support plate 31, two guide light axes 32 and a guide support plate 33, wherein the two guide light axes 32 are arranged in parallel from top to bottom, the guide support plate 33 is fixedly connected with the fixed support plate 31 through the two guide light axes 32 to form a rectangular frame structure; and the two guide light axes 32 are both directed to the test piece 10; the height position of the fixed support plate 31 relative to the side fixed plate 22 is adjustable, so that the contact position of the horizontal push rod 50 driven by the double guide rod driving assembly 40 relative to the test piece 10 is adjustable, thereby obtaining the fatigue test data of the lateral stress load of the test piece 10 at different contact positions.

[0028] ​The double guide rod driving assembly 40 comprises a threaded driving rod 41, a vertical driving plate 42, a horizontal pushing plate 43, a balance spring 44 and two sliding guide rods 45. The threaded driving rod 41 is symmetrically threaded on the two guide optical axes 32 of the guide support plate 33. The vertical driving plate 42 is vertically arranged and slidably connected to the two guide optical axes 32. The front end of the threaded driving rod 41 abuts against the middle position of the vertical driving plate 42. The two sliding guide rods 45 are horizontally arranged and symmetrically located on both sides of the central surface of the two guide optical axes 32. The rear end of the sliding guide rod 45 is fixedly connected to the horizontal pushing plate 43. The two sliding guide rods 45 slidably pass through the sliding shaft holes of the fixed support plate 31. Each balance spring 44 is sleeved on the sliding guide rod 45 and located between the fixed support plate 31 and the horizontal pushing plate 43. The vertical driving plate 42 abuts against the horizontal pushing plate 43 through a first pressure sensor 40a. Each balance spring 44 is connected to the horizontal pushing plate 43 or the fixed support plate 31 through a second pressure sensor. The front end of the two sliding guide rods 45 is connected to the horizontal pushing rod 50. The first pressure sensor 40a and the two second pressure sensors constitute the thrust measuring module. The thrust measuring module obtains the pressure difference F1-F2-F3 between the pressure F1 obtained by the first pressure sensor 40a and the pressures F2 and F3 obtained by the two second pressure sensors, so as to obtain the stress between the horizontal pushing rod 50 and the test piece 10.

[0029] The saddle 20 is mainly fixed on the lower fixing seat 11 and corresponds to the upper fixing seat 12, the center of the upper fixing seat 12 and the lower fixing seat 11 is provided with the cylindrical surface of the top rod, so as to balance the whole lateral force and keep the whole fixture fixed; the fixed guide frame 30 is fixedly connected with the saddle 20 from the side, thereby providing installation and working basis for the double guide rod driving assembly 40, so that the double guide rod driving assembly 40 can be located between the lower fixing seat 11 and the upper fixing seat 12, and the fixed guide frame 30 forms a rectangular frame structure, wherein the two horizontally arranged guide light axes 32 provide a moving track for the horizontal movement of the double guide rod driving assembly 40; the double guide rod driving assembly 40 drives the two sliding guide rods 45 on the two sides to make horizontal extension and retraction movement along the two guide light axes 32 of the fixed guide frame 30 by using a threaded driving rod 41, the double guide rod driving assembly 40 realizes the conversion of the movement of the threaded driving rod 41 into the movement of the two symmetrical sliding guide rods 45 by using the vertical driving plate 42 to drive the horizontal pushing plate 43, and the first pressure sensor 40a is arranged between the vertical driving plate 42 and the horizontal pushing plate 43, so as to detect the total pressure applied by the threaded driving rod 41; further, the two balance springs 44 detect the pressure values of the two second pressure sensors, so as to obtain the pushing force obtained by the horizontal pushing rod 50, and the two balance springs can balance the forces on the left and right sliding guide rods 45 during this period, thereby avoiding unilateral inclination.

[0030] The vertical driving plate 42 is provided with an axial hole through which the guide light axis 32 passes, and a sliding sleeve can be arranged on the inner wall of the axial hole to reduce the friction resistance of the guide light axis 32; correspondingly, axial holes through which the sliding guide rods 45 pass are arranged on the fixed support plate 31 between the two sliding guide rods 45 and the fixed support plate 31, and sliding sleeve structures are arranged in the axial holes.

[0031] The two guide light axes 32, the two sliding guide rods 45 and the threaded driving rod 41 form a positive cross-shaped symmetrical structure in space, that is, the threaded driving rod 41 is located at the center of the two guide light axes 32 in the vertical direction and is located at the center of the two sliding guide rods 45 in the horizontal direction.

[0032] The rear end of the threaded driving rod 41 is provided with a driving handle 46, the driving handle 46 is connected with a servo driving motor, and the servo driving motor is used for controlling the rotation of the driving handle 46 according to the pressure difference F1-F2-F3 obtained by the pushing force measuring module, so as to make the threaded driving rod 41 advance or retreat.

[0033] The front end of the threaded driving rod 41 is connected with the vertical driving plate 42 through a rotating bearing, and the rotating bearing can reduce the rotating friction resistance of the threaded driving rod 41.

[0034] The front end of the sliding guide rod 45 is connected with the test piece 10 through an adapter.

[0035] The adapter comprises a first docking block 47 and a second docking block 48, and the two docking blocks form a circular hole after docking to be connected with a horizontal push rod 50, wherein the rear end of the first docking block 47 is fixedly connected with the front end of the sliding rod 45.

[0036] The fatigue test system with lateral stress load provided by the application can apply horizontal load to the test piece through the horizontal push rod which is in contact with the test piece horizontally, and the size of the thrust force can be obtained through the pressure sensor, so that the horizontal lateral load can be continuously applied in the process of fatigue test, and the fatigue test data under the condition of lateral stress load can be obtained, and the fatigue life under the complex stress condition can be simulated.

[0037] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0038] The above-mentioned embodiments only express several embodiments of the application, and the description is more specific and detailed, but it should not be understood as the limitation of the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A fatigue testing system having a lateral stress load, characterized by, The fatigue test system comprises a lower fixing base (11), an upper fixing base (12) and a horizontal push rod (50), the upper fixing base (12) and the lower fixing base (11) clamp the upper and lower ends of the test piece (10), the horizontal push rod (50) is horizontally arranged between the upper fixing base (12) and the lower fixing base (11) and can move along the horizontal direction and contact the middle part of the test piece (10) to apply a horizontal pushing force to the test piece (10) and obtain the size of the pushing force through a pressure sensor.

2. The fatigue test system having lateral stress loading of claim 1, wherein, The horizontal push rod (50) is connected with a structure fixed in the lower fixing base (11) and the upper fixing base (12), so that the height of the horizontal push rod (50) is unchanged relative to the structure.

3. The fatigue test system with lateral stress load according to claim 2, characterized in that, The fatigue test system further comprises: a saddle (20), a fixed guide frame (30), a double guide rod driving assembly (40) and a push force measuring module, wherein the saddle (20) is sleeved on the lower fixing base (11), and the side surface of the saddle (20) is a vertical fixed surface to be fixedly connected with the fixed guide frame (30); the fixed guide frame (30) is a horizontally arranged square frame structure, and the height of the main body part of the fixed guide frame (30) corresponds to the position between the upper fixing base (12) and the lower fixing base (11); the double guide rod driving assembly (40) is connected with the fixed guide frame (30) to drive the horizontal push rod (50) to move along the horizontal direction; and the push force measuring module is used to indirectly measure the stress between the horizontal push rod (50) and the test piece (10). When the upper fixing base (12) is fixed, the saddle (20) is connected with the upper fixing base (12).

4. The fatigue test system with lateral stress load according to claim 3, characterized in that, The saddle (20) comprises a U-shaped seat (21) and a fixed side plate (22), the groove diameter of the U-shaped seat (21) is matched with the column diameter of the lower fixing base (11); and the side fixed plate (22) is connected with the side surface of the U-shaped seat (21) to fix the U-shaped seat (21) on the column of the lower fixing base (11).

5. The fatigue test system with lateral stress load according to claim 4, characterized in that, The fixed guide frame (30) comprises a fixed support plate (31), two guide light axes (32) and a guide support plate (33), wherein the two guide light axes (32) are arranged in parallel from top to bottom, the guide support plate (33) is fixedly connected with the fixed support plate (31) through the two guide light axes (32), forming a rectangular frame structure; wherein the two guide light axes (32) are both directed to the test piece (10); the height position of the fixed support plate (31) relative to the side fixed plate (22) is adjustable, so that the contact position of the horizontal push rod (50) driven by the double guide rod driving assembly (40) with the test piece (10) is adjustable, so as to obtain the fatigue test data of the lateral stress load of the test piece (10) at different contact positions.

6. The fatigue test system having a lateral stress load of claim 5, wherein, The double guide rod driving assembly (40) comprises a threaded driving rod (41), a vertical driving plate (42), a horizontal push plate (43), a balance spring (44) and two sliding guide rods (45), wherein the threaded driving rod (41) is symmetrically arranged on the center of the two guide light axes (32) of the guide support plate (33) through threaded connection; the vertical driving plate (42) is vertically arranged and slidably connected on the two guide light axes (32) from top to bottom, the front end of the threaded driving rod (41) abuts against the middle position of the vertical driving plate (42); the two sliding guide rods (45) are horizontally arranged and symmetrically arranged on both sides of the center surface of the two guide light axes (32), the rear end of the sliding guide rod (45) is fixedly connected with the horizontal push plate (43), the two sliding guide rods (45) slidably pass through the sliding shaft holes on the fixed support plate (31), each balance spring (44) is sleeved on the sliding guide rod (45) and located between the fixed support plate (31) and the horizontal push plate (43); the vertical driving plate (42) abuts against the horizontal push plate (43) through the first pressure sensor (40a), each balance spring (44) is connected with the horizontal push plate (43) or the fixed support plate (31) through a second pressure sensor; the front end of the two sliding guide rods (45) is connected with the horizontal push rod (50); the first pressure sensor (40a) and the two second pressure sensors form the push force measuring module, the stress between the horizontal push rod (50) and the test piece (10) is obtained by calculating the pressure difference F1-F2-F3 of the pressure F1 obtained by the first pressure sensor (40a) and the pressures F2 and F3 obtained by the two second pressure sensors.

7. The fatigue test system having a lateral stress load of claim 6, wherein, The two guide light axes (32), the two sliding guide rods (45) and the threaded driving rod (41) form a positive cross-shaped symmetric structure in space, that is, the threaded driving rod (41) is located at the center of the two guide light axes (32) in the vertical direction and at the center of the two sliding guide rods (45) in the horizontal direction.

8. The fatigue test system having lateral stress loading of claim 6, wherein, The rear end of the threaded drive rod (41) is provided with a drive handle (46), the drive handle (46) is connected with a servo drive motor, the servo drive motor is used for controlling the rotation of the drive handle (46) according to the pressure difference value F1-F2-F3 obtained by the thrust measurement module, so that the threaded drive rod (41) advances or retreats.

9. The fatigue test system having lateral stress loading of claim 6, wherein, The front end of the threaded drive rod (41) is connected with the vertical drive plate (42) through a rotating bearing; The front end of the sliding guide rod (45) is connected with the to-be-tested member (10) through an adapter.

10. The fatigue test system having lateral stress loading of claim 6, wherein, The adapter comprises a first docking block (47) and a second docking block (48), and the two docking blocks form a circular hole after docking to be connected with a horizontal push rod (50), wherein the rear end of the first docking block (47) is fixedly connected with the front end of the sliding rod (45).

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