CN112611654A - Circulating shear fatigue testing machine - Google Patents
Circulating shear fatigue testing machine Download PDFInfo
- Publication number
- CN112611654A CN112611654A CN202011364024.7A CN202011364024A CN112611654A CN 112611654 A CN112611654 A CN 112611654A CN 202011364024 A CN202011364024 A CN 202011364024A CN 112611654 A CN112611654 A CN 112611654A
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- China
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- test piece
- torque sensor
- rotating shaft
- clamping plate
- clamping block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
The invention discloses a cyclic shear fatigue testing machine, and belongs to the field of material testing. Circulation shear test machine gathers the mechanism including linking base, power pivot, rotation torque sensor, test piece clamping mechanism and test piece rotation angle, wherein: the utility model discloses a test piece rotation angle collection mechanism, including power pivot and chaining base, rotatory torque sensor is located chaining base top and with chaining base fixed connection, test piece clamping mechanism includes outer clamping mechanism and interior clamping mechanism, outer clamping mechanism and interior clamping mechanism are located power pivot top and respectively with rotatory torque sensor and power pivot fixed connection, test piece rotation angle collection mechanism includes follow-up pivot, carousel, reading wheel, encoder, follow-up pivot be located in the interior clamping device top and with interior clamping device fixed connection, carousel and follow-up pivot fixed connection, the reading wheel is located the encoder top. The invention is applied to material fatigue tests and solves the problem of circular shearing of plates.
Description
Technical Field
The invention relates to the field of material shear fatigue performance testing, in particular to a cyclic shear fatigue testing machine.
Background
At present, in the field of practical engineering application, metal materials are generally used as structural materials for carrying, and during service, due to the action of dynamic load, especially cyclic shearing action, the performance of the materials is reduced, and the service life is shortened. It is therefore necessary to determine the shear fatigue properties of the material under cyclic shear loading for the necessary structural detail strength property evaluations.
For the cyclic shear fatigue performance test of the material, the precision of test data is not high due to more interference factors in the test process. In the test of the prior art, a method is usually adopted to form a test piece and a testing machine into an integral structure, but due to the existence of a gap between a test sample and a testing device, the application of load is not consistent with an actual value in the repeated loading process, so that the influence on the precision of test data is large, and the method is a main bottleneck of the shear fatigue performance test of materials. Therefore, the test method for the cyclic shear fatigue performance of the material is also very limited and does not have the general applicability of the material.
In view of the above, there is a need for an apparatus with excellent and effective technology for measuring the cyclic shear fatigue performance of materials, which employs a smart structure design to shield the error caused by the apparatus, thereby further improving the authenticity and accuracy of the test data.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the cyclic shear fatigue testing machine which can repeatedly carry out cyclic shear loading on a test piece, can shield the influence of a transmission gap, the external deformation of a structure and external force on the testing precision, and greatly improves the accuracy of testing data.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a circulation shear fatigue testing machine is including linking base, power pivot, rotatory torque sensor, test piece clamping mechanism and test piece rotation angle acquisition mechanism, its characterized in that:
the lower end of the power rotating shaft is fixedly connected with a speed reducer in the link base, the rotary torque sensor is a hollow cylinder with a groove on the outer wall, the outer wall of the cylinder at the upper end of the rotary torque sensor is provided with external threads, and the lower surface of the rotary torque sensor is in contact with the upper surface of the link base and is fixedly connected with the upper surface of the link base through bolts;
the test piece clamping mechanism comprises an outer clamping mechanism and an inner clamping mechanism, the outer clamping mechanism comprises an outer clamping plate and an outer clamping plate, the outer clamping plate is a ring-shaped plate and is positioned above the rotary torque sensor, the outer clamping plate is a cover-shaped structure with a round hole in the middle, the lower surface of the outer clamping plate is in contact with the upper surface of the outer clamping plate and is fixedly connected with the rotary torque sensor, the inner clamping mechanism comprises an inner clamping block and an inner clamping block, the inner clamping block is a ring-shaped block and is positioned above the power rotating shaft, the inner clamping block is a T-shaped structure formed by two cylinders with different diameters, and the lower surface of the upper end cylinder of the inner clamping block is in contact with the upper surface of the inner clamping block and is fixedly connected with the power rotating shaft;
the test piece rotation angle acquisition mechanism comprises a follow-up rotating shaft, a rotary table, a reading wheel and an encoder, wherein the follow-up rotating shaft is located above the inner clamping block and fixedly connected with the inner clamping block, the rotary table is fixedly connected with the follow-up rotating shaft, and the reading wheel is located above the encoder and does not contact with the rotary table to slide relatively.
Furthermore, the central axes of the power rotating shaft, the rotating torque sensor, the outer clamping plate, the inner clamping block and the follow-up rotating shaft are overlapped, and the upper end face of the rotating torque sensor and the upper end face of the power rotating shaft are in the same horizontal plane.
Further, outer clamp plate upper surface is equipped with the screw thread through-hole that is circumference array distribution and cylindrical inner wall is equipped with the screw thread, outer clamp plate inner wall with rotatory torque sensor upper end cylinder outer wall passes through screw thread fixed connection.
Further, interior clamp splice upper end cylinder upper surface is equipped with the screw thread through-hole that is circumference array distribution and central point puts and is equipped with the screw hole, interior clamp splice lower extreme cylinder outer wall surface is equipped with the external screw thread, interior clamp plate lower extreme cylinder with power pivot upper end is through screw thread fixed connection.
Further, outer clamping mechanism makes the test piece cramped with interior clamping mechanism combined action, wherein:
the rotation of the clamping bolt in the threaded hole on the upper surface of the outer clamping plate enables the outer clamping plate to generate pressing force and transmit the pressing force to the outer clamping plate, and the outer clamping plate further transmits the pressing force to the outer ring of the annular test piece, so that the outer ring of the annular test piece is pressed on the upper surface of the rotating torque sensor;
and the rotation of the clamping bolt in the threaded hole on the upper surface of the inner clamping block enables the inner clamping block to generate pressing force and transmit the pressing force to the inner clamping block, and the inner clamping block further transmits the pressing force to the inner ring of the annular test piece, so that the inner ring of the annular test piece is pressed on the upper surface of the power rotating shaft.
Furthermore, the power rotating shaft rotates to enable the inner ring of the test piece to rotate synchronously, and the outer ring and the inner ring of the annular test piece can rotate relatively under the fastening effect of the outer clamping plate on the outer ring of the annular test piece, so that the shear loading of the test piece is completed.
Further, follow-up pivot lower extreme passes through screw thread fixed connection with interior clamp splice upper end, the follow-up pivot passes interior clamp splice centre bore and power pivot synchronous rotation, the rotation angle of power pivot is enlargied through the epaxial carousel of follow-up pivot, the rotation axis that the reading wheel rotated the drive encoder rotates, the rotation angle of power pivot is recorded to the encoder.
Compared with the prior art, the invention has the beneficial effects that: firstly, the test piece can be subjected to cyclic shearing loading, and the loading mode is simple and reliable; secondly, the diameter of the position turntable is large, so that the gap of a transmission system is shielded, and the detection precision of the relative rotation angle of the inner ring and the outer ring of the test piece is greatly improved (the resolution can reach 0.00189); meanwhile, the other end of the encoder is fixed on the outer clamping plate, so that the deformation of the rotating torque sensor can be shielded, the detection precision of the rotating angle is further improved, and the validity of experimental data is ensured; in addition, can carry out the capability test to different material test pieces, practice thrift the cost, realize energy-conservation and the lightweight of equipment.
Drawings
FIG. 1 is a schematic diagram of a complete structure provided by an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of a clamping device provided in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of a turntable according to an embodiment of the present invention;
in the figure: a link base 1; a driving rotating shaft 2; a rotational torque sensor 3; 4-1 of an inner clamping block bolt; 4-2 of an inner clamping block; 4-3 of outer clamping plate bolts; 4-4 of an outer clamping plate; 4-5 parts of an outer pressing plate; 4-6 parts of internal pressing block; a follow-up rotating shaft 5-1; 5-2 of a rotary table; 5-3 of a reading wheel; 5-4 of an encoder; a connecting frame 6; a fixed seat 7; an annular test piece 8.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention clearer, the following detailed and complete descriptions will be made with reference to the accompanying drawings and specific embodiments.
The invention provides a cyclic shear fatigue testing machine, which comprises a linking base 1, a power rotating shaft 2, a rotating torque sensor 3, a test piece clamping mechanism 4 and a test piece rotating angle acquisition mechanism 5, as shown in figure 1, wherein:
the lower end of the power rotating shaft 2 is fixedly connected with a speed reducer in the link base 1, the cylindrical outer wall of the upper end of the rotary torque sensor 3 is provided with threads, and the lower surface of the rotary torque sensor 3 is in contact with the upper surface of the link base 1 and is fixedly connected with the upper surface of the link base 1 through bolts;
the upper end surface of the power rotating shaft 2 and the upper end surface of the rotating torque sensor 3 are in the same horizontal plane, and the lower surface of the annular test piece 8 is in contact with the upper surfaces of the power rotating shaft 2 and the rotating torque sensor 3;
the cylindrical inner wall of the outer clamping plate 4-4 is provided with threads, the threads are in threaded fit connection with threads on the cylindrical outer wall at the upper end of the rotary torque sensor 3, the rotary torque sensor 3 and the outer clamping plate 4-4 are fixed into a whole, threaded through holes in a circumferential array are further formed in the upper end face of the outer clamping plate 4-4, the outer clamping plate 4-5 is tightly pressed on the outer ring of the annular test piece 8 by rotating bolts 4-3 in the threaded holes, and the outer ring of the annular test piece 8 is fixed on the upper surfaces of the power rotating shaft 2 and the rotary torque sensor 3;
the upper end face of the inner clamping block 4-2 is provided with threaded through holes distributed in a circumferential array mode, the center of the inner clamping block 4-2 is provided with a threaded hole, the outer wall of a cylinder at the lower end of the inner clamping block 4-2 is provided with external threads, the threads penetrate through a center hole of the inner clamping block 4-6 to be matched with the internal threaded hole at the upper end of the power rotating shaft 2, then the inner clamping block 4-2 is tightly pressed on the inner ring of the annular test piece 8 through rotating a bolt 4-1 in the threaded through hole of the inner clamping block 4-2, and the inner clamping block 4-2 and the inner ring of the annular test piece 8 are.
The follow-up rotating shaft 5-1 is matched and connected with a threaded hole at the central position of the upper end surface of the inner clamping block 4-2 through a lower end screw, so that the follow-up rotating shaft and the inner clamping block are fixed into a whole, the follow-up rotating shaft 5-1 rotates synchronously with the rotation of the follow-up rotating shaft 2, the rotary table 5-2 at the upper end of the follow-up rotating shaft 5-1 is fixed into a whole with the follow-up rotating shaft 5-1, the rotary table 5-2 rotates synchronously with the rotation of the follow-up rotating shaft 5-1, the reading wheel 5-3 is positioned above the encoder 5-4 and does not contact with the rotary table 5-2 to slide relatively, the encoder 5-4 is connected with the fixed seat 7 through the connecting frame 6, the fixed seat 7 is fixedly connected with the outer pressing plate 4-4 to do not move relatively, the reading wheel 5-3 rotates synchronously with the rotation of the rotary table 5-, meanwhile, the rotating shaft of the encoder 5-4 synchronously rotates along with the rotation of the reading wheel 5-3. .
In summary, the annular test piece 8 is fixed on the upper surfaces of the power rotating shaft 2 and the rotating torque sensor 3, the power rotating shaft 2 rotates to enable the inner ring of the annular test piece 8 to rotate synchronously, meanwhile, under the fastening action of the outer clamping plate 4-4 on the outer ring of the annular test piece 8, the outer ring and the inner ring of the annular test piece 8 can rotate relatively to complete the shearing loading of the test piece, the rotating angle of the annular test piece 8 is amplified through the turntable 5-2 on the follow-up rotating shaft 5-1, and then the reading wheel 5-3 drives the rotating shaft of the encoder 5-4 to rotate, so that the corresponding rotating angle is obtained.
After the steps are completed and the annular test piece 8 is loaded, the test piece is taken down and the encoder 5-4 is reset to zero.
The above description is of the preferred embodiments of the present invention, and it should be understood by those skilled in the art that the modifications and improvements of the present invention can be made without departing from the technical scope of the present invention, and the modifications and improvements should be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a circulation shear fatigue testing machine is including linking base, power pivot, rotatory torque sensor, test piece clamping mechanism and test piece rotation angle acquisition mechanism, its characterized in that:
the lower end of the power rotating shaft is fixedly connected with a speed reducer in the linking base; the rotary torque sensor is a hollow cylinder with a groove on the outer wall, external threads are arranged on the cylindrical outer wall of the upper end of the rotary torque sensor, and the lower surface of the rotary torque sensor is in contact with the upper surface of the link base and is fixedly connected with the upper surface of the link base through bolts;
the test piece clamping mechanism comprises an outer clamping mechanism and an inner clamping mechanism, the outer clamping mechanism comprises an outer clamping plate and an outer clamping plate, the outer clamping plate is a ring-shaped plate and is positioned above the rotary torque sensor, the outer clamping plate is a cover-shaped structure with a round hole in the middle, the lower surface of the outer clamping plate is in contact with the upper surface of the outer clamping plate and is fixedly connected with the rotary torque sensor, the inner clamping mechanism comprises an inner clamping block and an inner clamping block, the inner clamping block is a ring-shaped block and is positioned above the power rotating shaft, the inner clamping block is a T-shaped structure formed by two cylinders with different diameters, and the lower surface of the upper end cylinder of the inner clamping block is in contact with the upper surface of the inner clamping block and is fixedly connected with the power rotating shaft;
the test piece rotation angle acquisition mechanism comprises a follow-up rotating shaft, a rotary table, a reading wheel and an encoder, wherein the follow-up rotating shaft is located above the inner clamping block and fixedly connected with the inner clamping block, the rotary table is fixedly connected with the follow-up rotating shaft, and the reading wheel is located above the encoder and does not contact with the rotary table to slide relatively.
2. The cyclic shear fatigue tester of claim 1, wherein: the central axes of the power rotating shaft, the rotating torque sensor, the outer clamping plate, the inner clamping block and the follow-up rotating shaft are mutually overlapped, and the upper end face of the rotating torque sensor and the upper end face of the power rotating shaft are in the same horizontal plane.
3. The cyclic shear fatigue tester of claim 1, wherein: the upper surface of the outer clamping plate is provided with threaded through holes distributed in a circumferential array manner, the cylindrical inner wall of the outer clamping plate is provided with threads, and the inner wall of the outer clamping plate is fixedly connected with the cylindrical outer wall at the upper end of the rotary torque sensor through the threads;
interior clamp splice upper end cylinder upper surface is equipped with and is the screw thread through-hole and the central point that circumference array distributes puts and is equipped with the screw hole, interior clamp splice lower extreme cylinder outer wall surface is equipped with the external screw thread, interior clamp plate lower extreme cylinder with power pivot upper end is through screw thread fixed connection.
4. A cyclic shear fatigue tester according to claims 2 and 3, characterized in that: the outer clamping mechanism and the inner clamping mechanism act together to clamp the test piece, wherein:
the rotation of the clamping bolt in the threaded hole on the upper surface of the outer clamping plate enables the outer clamping plate to generate pressing force and transmit the pressing force to the outer clamping plate, and the outer clamping plate further transmits the pressing force to the outer ring of the annular test piece, so that the outer ring of the annular test piece is pressed on the upper surface of the rotating torque sensor;
and the rotation of the clamping bolt in the threaded hole on the upper surface of the inner clamping block enables the inner clamping block to generate pressing force and transmit the pressing force to the inner clamping block, and the inner clamping block further transmits the pressing force to the inner ring of the annular test piece, so that the inner ring of the annular test piece is pressed on the upper surface of the power rotating shaft.
5. The cyclic shear fatigue tester of claims 3 and 4, wherein: the power rotating shaft rotates to enable the inner ring of the test piece to rotate synchronously, and the outer ring and the inner ring of the annular test piece can rotate relatively under the fastening effect of the outer clamping plate on the outer ring of the annular test piece, so that the shear loading of the test piece is completed.
6. The cyclic shear fatigue tester of claims 1-5, wherein: follow-up pivot lower extreme passes through screw thread fixed connection with interior clamp splice upper end, follow-up pivot passes interior clamp splice centre bore and power pivot synchronous rotation, the rotation angle of power pivot is enlargied through the epaxial carousel of follow-up, the rotation axis rotation that the reading wheel rotated the drive encoder, the rotation angle of power pivot is recorded to the encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011364024.7A CN112611654B (en) | 2020-11-27 | 2020-11-27 | Circulating shear fatigue testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011364024.7A CN112611654B (en) | 2020-11-27 | 2020-11-27 | Circulating shear fatigue testing machine |
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| Publication Number | Publication Date |
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| CN112611654A true CN112611654A (en) | 2021-04-06 |
| CN112611654B CN112611654B (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011364024.7A Active CN112611654B (en) | 2020-11-27 | 2020-11-27 | Circulating shear fatigue testing machine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817946A (en) * | 1996-10-28 | 1998-10-06 | Test Quip, Inc. | Gyratory compaction apparatus for creating compression and shear forces in a sample material |
| CN103278401A (en) * | 2013-05-02 | 2013-09-04 | 大连理工大学 | Device and method for determining rotational shearing vibration fatigue damage performance of bituminous mixture |
| CN106680117A (en) * | 2016-06-02 | 2017-05-17 | 山东大学（威海） | Novel sheet metal torsion testing machine |
| CN109283067A (en) * | 2018-09-13 | 2019-01-29 | 西北工业大学 | A kind of sheet metal double direction shear experimental rig |
| CN109444452A (en) * | 2018-10-17 | 2019-03-08 | 河海大学 | A kind of mechanism of precise measurement large torque Ultra-Low Speed torque system revolving speed and corner |
| CN109556973A (en) * | 2018-12-19 | 2019-04-02 | 西安交通大学 | A kind of material test apparatus based on torsion test in face |
| CN109556974A (en) * | 2018-12-29 | 2019-04-02 | 江西豪斯特汽车零部件有限公司 | A kind of plate plane is interior to reverse test device and method |
-
2020
- 2020-11-27 CN CN202011364024.7A patent/CN112611654B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817946A (en) * | 1996-10-28 | 1998-10-06 | Test Quip, Inc. | Gyratory compaction apparatus for creating compression and shear forces in a sample material |
| CN103278401A (en) * | 2013-05-02 | 2013-09-04 | 大连理工大学 | Device and method for determining rotational shearing vibration fatigue damage performance of bituminous mixture |
| CN106680117A (en) * | 2016-06-02 | 2017-05-17 | 山东大学（威海） | Novel sheet metal torsion testing machine |
| CN109283067A (en) * | 2018-09-13 | 2019-01-29 | 西北工业大学 | A kind of sheet metal double direction shear experimental rig |
| CN109444452A (en) * | 2018-10-17 | 2019-03-08 | 河海大学 | A kind of mechanism of precise measurement large torque Ultra-Low Speed torque system revolving speed and corner |
| CN109556973A (en) * | 2018-12-19 | 2019-04-02 | 西安交通大学 | A kind of material test apparatus based on torsion test in face |
| CN109556974A (en) * | 2018-12-29 | 2019-04-02 | 江西豪斯特汽车零部件有限公司 | A kind of plate plane is interior to reverse test device and method |
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| CN112611654B (en) | 2022-05-17 |
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