Engineering material compression-torsion composite creep characteristic test system

Abstract

The utility model discloses an engineering material compression-torsion composite creep characteristic test system, which comprises a counter-force frame, a horizontal loading mechanism and an arc-shaped bearing plate, balls are embedded on the inner surface of the bearing plate, a torsion loading mechanism is placed above the bearing plate, the torsion loading mechanism comprises a plurality of torsion rollers with round exteriors and square interiors, and the torsion rollers are connected with the counter-force frame. Square holes penetrate through the central axes of the twisting rollers, a sample horizontally penetrates through the twisting rollers, a stand column is installed on the tops of the twisting rollers, a lifting rope is connected to the stand column, a lifting hook used for being connected with a weight is arranged at the lower end of the lifting rope, and angle values in a circumferential array are arranged on the side faces of the twisting rollers. A plurality of vertically downward pointers are slidably mounted on the lower surface of the top frame of the counter-force frame through sliding grooves. The creep characteristic testing system can be used for testing the creep characteristic of the sample under the working condition of single load of pressure load and torsion load or multiple composite loads, and in the testing process, the testing system can reduce the interference load influence on the sample and improve the testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of mechanical property testing technology, and in particular to a testing system for the combined compression and torsion creep characteristics of engineering materials. Background Technology

[0002] Rock and concrete are commonly used engineering materials in civil engineering, and understanding their creep mechanical properties is crucial for engineering construction. Existing combined compression and torsion creep characteristic tests ignore the interference of testing equipment on the load, such as the frictional force experienced by the specimen during deformation, which makes the test results unable to reflect the true performance of the specimen. Moreover, the application position of the torsional load is inconvenient to adjust, and the working conditions that can be simulated are relatively limited. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a test system for the combined compression and torsion creep characteristics of engineering materials, which can test the creep characteristics of samples under single load or multiple combined load conditions of compression and torsion loads. During the test, the test system can reduce the influence of interference loads on the samples and improve the accuracy and authenticity of the test.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a testing system for the combined compression and torsion creep characteristics of engineering materials, comprising a reaction frame, the inner and outer contours of which are rectangular, a horizontal loading mechanism threaded through one side of the reaction frame, an arc-shaped support plate horizontally installed between the two side walls of the reaction frame, ball bearings embedded in the inner surface of the support plate, a torsion loading mechanism placed above the support plate, the torsion loading mechanism comprising multiple torsion rollers with outer circles and inner squares, a square hole opened through the central axis of the torsion roller, the shape of the square hole being the same as the cross-sectional shape of the sample, the sample horizontally passing through the multiple torsion rollers, a column installed on the top of the torsion rollers, a suspension rope connected to the column, a hook for connecting weights at the lower end of the suspension rope, angle values ​​arranged in a circumferential array on the side of the torsion rollers, multiple vertically downward pointers slidably installed on the lower surface of the top frame of the reaction frame through a groove, the extension line of the pointers passing through the central axis of the torsion rollers, one end of the sample abutting the inner wall of the reaction frame, and the other end of the sample abutting the horizontal loading mechanism.

[0005] Furthermore, the horizontal loading mechanism includes a rotating wheel, a lead screw connected to the rotating wheel and passing through the side of the reaction frame, a pressure sensor and a pad connected to the inner end of the lead screw, the shape of the pad being the same as the cross-sectional shape of the sample, and the pad abutting against the other end of the sample.

[0006] Furthermore, the geometric center of the square hole is located on the central axis of the torsion roller.

[0007] The beneficial effects of adopting the above technical solution are as follows: This utility model, through the horizontal loading mechanism and the torsional loading mechanism, can test the creep characteristics of the sample under single load or multiple combined load conditions of pressure load and torsional load; and during the test, the arc-shaped support plate and the rolling balls on its inner surface can reduce the friction force received by the sample during deformation, reduce the influence of interference load on the sample, and improve the accuracy and authenticity of the test. Attached Figure Description

[0008] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0009] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0010] Figure 2 This is a cross-sectional view of the present invention.

[0011] Figure 3 This is a side view of the torsional loading mechanism of this utility model.

[0012] In the figure: 1. Reaction frame 2. Horizontal loading mechanism 3. Support plate 4. Ball bearing 5. Torsion roller 6. Square hole 7. Sample 8. Column 9. Lifting rope 10. Lifting hook 11. Weight 12. Angle value 13. Pointer 14. Slide groove 21. Rotary wheel 22. Lead screw 23. Pressure sensor 25. Pad plate. Detailed Implementation

[0013] In one specific embodiment of the present invention, a reaction frame is included, the inner and outer contours of which are rectangular. A horizontal loading mechanism is threaded through one side of the reaction frame. An arc-shaped support plate is horizontally installed between the two side walls of the reaction frame. Ball bearings are embedded in the inner surface of the support plate. A torsional loading mechanism is placed above the support plate. The torsional loading mechanism includes multiple torsional rollers with outer circles and inner squares. A square hole is opened through the central axis of the torsional roller. The shape of the square hole is the same as the cross-sectional shape of the sample. The sample passes horizontally through the multiple torsional rollers. A column is installed on the top of the torsional roller. A suspension rope is connected to the column. The lower end of the suspension rope has a hook for connecting weights. An angle value is arranged in a circumferential array on the side of the torsional roller. Multiple vertically downward pointers are slidably installed on the lower surface of the top frame of the reaction frame through a groove. The extension line of the pointer passes through the central axis of the torsional roller. One end of the sample abuts against the inner wall of the reaction frame, and the other end of the sample abuts against the horizontal loading mechanism.

[0014] The horizontal loading mechanism includes a rotating wheel and a lead screw connected to the rotating wheel and passing through the side of the reaction frame. The inner end of the lead screw is connected to a pressure sensor and a pad. The shape of the pad is the same as the cross-sectional shape of the sample, and the pad abuts against the other end of the sample.

[0015] The geometric center of the square hole is located on the central axis of the torsion roller.

[0016] The working principle of this invention is as follows: During use, the sample is passed through the square holes of multiple torsion rollers, and then the torsion rollers, along with the sample, are placed on a support plate. A horizontal loading mechanism applies pressure loads of varying strengths to the ends of the sample. The torsional loads of different strengths, directions, and positions are adjusted by the placement of weights on the torsion rollers and the orientation of the suspension rope. The change in the angle pointed to by the pointer is timed and recorded. This allows for creep characteristic testing of the sample under single or multiple combined pressure and torsional loads. The test results are applicable to a wide range of working conditions, and the support plate and the balls embedded in its surface reduce the interference of friction on sample deformation, improving the authenticity and accuracy of the test.

[0017] The above description is only presented as a possible technical solution of the present invention and is not intended as a single limitation on the technical solution itself.

Claims

1. A testing system for the combined compression and torsion creep characteristics of engineering materials, characterized in that: The system includes a reaction frame, whose inner and outer contours are both rectangular. A horizontal loading mechanism is threaded through one side of the reaction frame. An arc-shaped support plate is horizontally installed between the two side walls of the reaction frame. Ball bearings are embedded in the inner surface of the support plate. A torsional loading mechanism is placed above the support plate. The torsional loading mechanism includes multiple torsional rollers with outer circles and inner squares. A square hole is opened through the central axis of the torsional roller. The shape of the square hole is the same as the cross-sectional shape of the sample. The sample passes horizontally through the multiple torsional rollers. A column is installed on the top of the torsional roller. A suspension rope is connected to the column. The lower end of the suspension rope has a hook for connecting weights. An angle value is set on the side of the torsional roller in a circumferential array. Multiple vertically downward pointers are slidably installed on the lower surface of the top frame of the reaction frame through a groove. The extension line of the pointer passes through the central axis of the torsional roller. One end of the sample abuts against the inner wall of the reaction frame, and the other end of the sample abuts against the horizontal loading mechanism.

2. The engineering material compression-torsion combined creep characteristic testing system according to claim 1, characterized in that: The horizontal loading mechanism includes a rotating wheel and a lead screw connected to the rotating wheel and passing through the side of the reaction frame. The inner end of the lead screw is connected to a pressure sensor and a pad. The shape of the pad is the same as the cross-sectional shape of the sample, and the pad abuts against the other end of the sample.

3. The engineering material compression-torsion combined creep characteristic testing system according to claim 1, characterized in that: The geometric center of the square hole is located on the central axis of the torsion roller.

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