CN110618044B - Impact experiment method for pre-adding axial force and bending moment - Google Patents
Impact experiment method for pre-adding axial force and bending moment Download PDFInfo
- Publication number
- CN110618044B CN110618044B CN201910897209.5A CN201910897209A CN110618044B CN 110618044 B CN110618044 B CN 110618044B CN 201910897209 A CN201910897209 A CN 201910897209A CN 110618044 B CN110618044 B CN 110618044B
- Authority
- CN
- China
- Prior art keywords
- test piece
- bending moment
- shaped
- axial force
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- 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
-
- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an impact experiment method for pre-applying axial force and bending moment, wherein a fixing device adopted by the method comprises 7 parts of a rigid base, a sliding end load applying assembly, a fixed end load applying assembly, a pendulum bob, a test piece, a data acquisition system and a computer terminal, and the key technical point is that a loading pressure head driven by a pneumatic device is embedded into a toothed track compression test piece capable of flexibly adjusting the eccentricity, so that various initial axial force and bending moment working condition combinations are realized; during impact experiments, instantaneous impact force causes lateral deformation of a test piece and axial contraction, a piston of a pneumatic device extends, gradually-weakened axial force and bending moment are continuously applied until a component fails, and the actual evolution rule of internal force in the structure collapse process is accurately simulated; meanwhile, the data acquisition system records the load, the displacement change and the test piece configuration evolution process in real time, and provides data support for evaluating the collapse resistance of the test piece and establishing an accurate mechanical analysis model.
Description
Technical Field
The invention belongs to a test piece fixing and preloading device for an experiment and an experiment method thereof, and particularly relates to a test piece fixing device for preloading axial force and bending moment in cooperation with an impact experiment and an experiment method thereof.
Background
With social progress and increasingly severe anti-terrorism, people have higher requirements on the safety design of large public buildings and protective structures. Since the last century, various researchers of China have strengthened the mechanical analysis and experimental research of structural members under impact load, have promoted the huge development of materials and energy absorption devices, and have been applied to fields such as automobile, aerospace and military industries in a large number. The pillar is as the main bearing of building structure and resists the side component, and the inefficacy that triggers under the effect of assaulting type dynamic load will lead to large-scale personnel and property loss, receives increasing attention to its development experiment research. However, given the complexity of the problem, conventional experimental methods are only applicable to simple loading and boundary conditions, such as considering only clamped or simply clamped boundaries, or considering only the effect of the initial axial force on the structural response, while ignoring the fading effect of the axial force during the overall deformation process and the bending moment effect which has a large effect on the structural response. Therefore, the accurate structure safety evaluation and the perfection of the design theory need an experimental device which can simultaneously consider the gradual change axial force and the bending moment, and the experimental research is carried out based on the gradual change axial force and the bending moment.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a specimen fixing device for pre-applying axial force and bending moment, which is simple, compact and easy to operate, and which can not only provide various internal force combinations to complete pre-loading under different conditions and impact after specimen loading, but also accurately measure and record the decreasing axial force and bending moment borne by the specimen during the impact test in real time.
The invention discloses a test piece fixing device for pre-applying axial force and bending moment in cooperation with an impact experiment. The device comprises a rigid base, a sliding end load applying assembly, a fixed end load applying assembly, a pendulum bob, a test piece, a data acquisition system and a computer terminal.
The rigid base comprises a sliding end rigid base and a fixed end rigid base, and the sliding end rigid base and the fixed end rigid base are fixed at the designated positions of the rigid bottom plate through ground anchors.
The data acquisition system comprises a pressure sensor, a displacement sensor, a dynamic acquisition instrument, a non-contact strain displacement measuring instrument and a computer terminal. The pressure sensor and the displacement sensor are connected with the dynamic acquisition instrument through a data transmission line; the dynamic acquisition instrument and the non-contact strain displacement measuring instrument are in communication connection with the computer terminal through a data transmission line.
The sliding end load applying assembly comprises a sliding shaft force applying assembly, a sliding bending moment applying assembly, a gas pressurizing system and a pneumatic loading assembly. The pneumatic loading assembly is fixed at the upper end of the sliding end rigid base through a high-strength bolt. The front end of the pneumatic loading assembly is sequentially fixed with the sliding shaft force applying assembly and the sliding bending moment applying assembly through high-strength bolts. The rotating clamp of the sliding bending moment applying assembly clamps one end of the test piece to prevent the test piece from being pulled out.
The sliding shaft force loading assembly further comprises a sliding barrel, a partition plate, a pressure sensor and a protective cover. The sliding cylinder can ensure that the movement direction of the knife-shaped loading pressure head is kept unchanged, and further ensure that the direction of the applied axial force is unchanged.
The sliding bending moment applying assembly further comprises an arc-shaped track, a knife-shaped loading pressure head, a rotating clamp and a tooth-shaped slideway. The knife-shaped head of the knife-shaped loading pressure head is clamped into the tooth-shaped groove of the tooth-shaped slide way, the thickness of the knife-shaped head of the knife-shaped loading pressure head is smaller than the opening width of the tooth-shaped groove, and the purpose is that the tooth-shaped slide way rotates by taking the top of the knife-shaped head of the knife-shaped loading pressure head in the tooth-shaped groove as a fulcrum in the loading process.
The pneumatic loading assembly further comprises a base plate, an air cylinder and a fixing clamp. The backing plate is connected with the sliding end rigid base, and the air cylinder is fixed on the backing plate through a fixing clamp. The end part of the piston rod of the air cylinder is connected with the pressure sensor through the partition plate. The air cylinder in the pneumatic loading assembly can work independently without assembling a bending moment applying assembly, and experimental research of a test piece under simple axial force loading is realized.
The gas pressurizing system is connected with the cylinder through a high-pressure gas pipe. And the guide pipe is connected with a check valve for controlling the communication and the blockage of the cylinder and the gas pressurizing system. The gas pressurizing system can set a target pressurizing level for the cylinder, and when the pressure in the cylinder reaches a target pressure value, the gas pressurizing system automatically stops pressurizing and maintains the pressure value in the cylinder unchanged.
The fixed end load applying assembly is fixed on the fixed end rigid base and comprises an arc-shaped track, a knife-shaped loading pressure head, a rotating clamp, a tooth-shaped slideway and an adjustable fixing plate. The rotary clamp clamps the other end of the test piece, and the tail end of the knife-shaped loading pressure head is fixed on the rigid base of the fixed end through the adjustable fixing plate.
When the axial force and the bending moment are applied, the target pressurizing level of the air cylinder is set through the air pressurizing system according to the axial force and the bending moment which need to be applied, the air pressurizing system automatically stops pressurizing when the pressure in the air cylinder reaches a target pressure value, the pressure value in the air cylinder is maintained to be unchanged, and the check valve is closed. In the pressurizing process, a piston rod in the cylinder extends outwards along with the rising of the air pressure in the cylinder, and drives the pressure sensor, a knife-shaped loading pressure head of the sliding bending moment applying assembly and a tooth-shaped slideway to slide forwards, the tooth-shaped slideway rotates by taking the top of a knife-shaped head of the knife-shaped loading pressure head in the tooth-shaped groove as a fulcrum, so that the test piece is subjected to the action of axial pressure and bending moment at one end, meanwhile, the fixed end load applying assembly can provide corresponding reaction force (including the axial pressure and the bending moment) for the test piece at the other end of the test piece, and the test piece is subjected to bending deformation, so that the axial force and the bending moment are pre-applied to the test piece.
The bending moment applying assembly can flexibly adjust the level of axial output pressure and the eccentricity of the knife-shaped loading pressure head embedded into different positions of the toothed track, and various initial axial forces and bending moment working condition combinations are realized.
In the process of pressurizing the cylinder, the dynamic acquisition instrument respectively measures and records the pressure of the piston rod of the cylinder to the pressure sensor (namely the axial pressure value on two end parts of the test piece) and the axial displacement of the two end parts of the test piece in real time through the pressure sensor and the displacement sensor and displays the pressure and the axial displacement on the computer terminal in real time;
the non-contact strain displacement measuring instrument measures and records the deflection of the middle part of the test piece in real time and displays the deflection on a computer terminal in real time.
The cylinder piston rod of the pneumatic loading assembly can slide along with a test piece which is axially deformed under the action of initial loading and impact, and the axial pressure and the bending moment are reduced due to the fact that the pressure in the cylinder is reduced, so that the gradual-down effect of the axial force and the bending moment in the actual engineering collapse process can be truly simulated.
The second purpose of the invention is to provide an experimental method of the test piece fixing device for pre-applying axial force and bending moment in cooperation with the impact experiment, which has the characteristics of simple and convenient operation, easy replacement of multiple components and the like.
The experimental method of the test piece fixing device for pre-applying axial force and bending moment in the cooperation with the impact experiment is characterized by comprising the following steps of:
firstly, adjusting the positions of a sliding end load applying component and a fixed end load applying component according to the length of a test piece, and respectively fixing the two ends of the test piece on clamps of two end loading components;
secondly, adjusting the positions of the knife-shaped loading pressure heads of the load applying assemblies at two ends on the tooth-shaped slide ways;
thirdly, starting the dynamic acquisition instrument, the pressure sensor, the displacement meter and the computer terminal, and starting to record and display the pressure applied to the end part of the test piece and the axial displacement of the end part in real time by the computer terminal; opening a check valve, setting a target pressurizing level of a gas pressurizing system according to the axial force and the bending moment required by the test, starting equipment to start pressurizing, automatically stopping pressurizing by the gas pressurizing system when the pressure in the cylinder reaches the target pressure, keeping the pressure value in the cylinder unchanged, closing the check valve, and finishing preloading of the test piece after the pressurizing is finished;
fourthly, starting the non-contact strain displacement measuring instrument and the computer terminal, starting the computer terminal to record and display the deflection of the middle part of the test piece in real time, adjusting the pendulum bob to the target height, releasing the pendulum bob, finishing the impact on the test piece by the pendulum bob, simultaneously recording and displaying the external pressure, the axial displacement and the deflection of the middle part of the test piece on the computer terminal in real time by the data acquisition system in the whole impact process, and synchronously displaying the axial force and the end bending moment of any position in the axial direction of the test piece on the computer terminal in real time according to an axial force and bending moment formula;
and fifthly, printing out test data, closing the equipment and disassembling the impacted test piece.
In summary, compared with the existing test device, the invention has the following beneficial effects:
1. the experiment fixing device can realize the application of different axial force levels by adjusting the pressurizing level of the pneumatic device.
2. The experiment fixing device can realize various combined working conditions of axial force and bending moment by adjusting the direction of the arc-shaped track and the position of the loading pressure head on the tooth-shaped track.
3. The experimental fixing device can continuously apply the axial force and the bending moment with gradually reduced amplitude after the test piece bears transient lateral impact, and accords with the actual situation of the engineering collapse process.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention when applying axial force and bending moment;
FIG. 2 is a schematic view of the exploded structure of the apparatus of the present invention when applying axial force and bending moment;
FIG. 3 is a force diagram of a test piece of the apparatus of the present invention in 4 different states;
FIG. 4 is a bending moment diagram of a test piece of the apparatus of the present invention in 4 different states.
Description of reference numerals:
1. a ground anchor; 2. a sliding end rigid base; 3. a rigid base for the fixed end; 4. a pneumatic loading component (4a, a backing plate; 4b, a fixing clamp; 4c, a cylinder); 5. a sliding shaft force applying component (5a, a sliding cylinder; 5b, a clapboard; 5c, a pressure sensor; 5d, a protective cover); 6. a sliding bending moment applying component (6a, an arc track; 6b, a knife-shaped loading pressure head; 6c, a rotating clamp; 6d, a tooth-shaped slideway); 7. a fixed end bending moment applying component (7a, a knife-shaped loading pressure head, 7b, an adjustable fixing plate); 8. a check valve; 9. a displacement sensor; 10. a dynamic acquisition instrument; 11. a computer terminal; 12. a gas pressurization system; 13. a test piece; 14. a non-contact strain displacement gauge; 15. a pendulum bob; 16-18 parts of high-strength bolt.
Detailed Description
In order to make the technical means of the present invention easily understood, the following description is made with reference to the accompanying drawings. In the following description, well-known structures and functions are not described in detail.
As shown in figures 1 and 2, the invention relates to a test piece fixing device for pre-applying axial force and bending moment in cooperation with an impact experiment.
The rigid base comprises a sliding end rigid base 2 and a fixed end rigid base 3, which are fixed at the designated positions of the rigid bottom plate through ground anchors 1.
The data acquisition system comprises a pressure sensor 5c, a displacement sensor 9, a dynamic acquisition instrument 10, a non-contact strain displacement measuring instrument 14 and a computer terminal 11. The pressure sensor 5c and the displacement sensor 9 are connected with a dynamic acquisition instrument through a data transmission line; the dynamic acquisition instrument and the non-contact strain displacement measuring instrument are in communication connection with the computer terminal through a data transmission line.
The sliding end load application assembly comprises a sliding shaft force application assembly 5, a sliding bending moment application assembly 6, a gas charging system 12 and a pneumatic loading assembly 4. The pneumatic loading assembly is fixed at the upper end of the sliding end rigid base 2 through a high-strength bolt. The front end of the pneumatic loading assembly is sequentially fixed with the sliding shaft force applying assembly and the sliding bending moment applying assembly through high-strength bolts. The rotating clamp 6c of the sliding bending moment applying assembly clamps one end of the test piece 13 to prevent the test piece from being pulled out.
The sliding shaft force loading assembly 5 further includes a sliding cylinder 5a, a diaphragm 5b, a pressure sensor 5c, and a protection cover 5 d. The sliding cylinder can ensure that the movement direction of the knife-shaped loading pressure head 6b is kept unchanged, and further ensure that the direction of the applied axial force is unchanged.
The sliding bending moment applying assembly 6 further comprises an arc-shaped track 6a, a knife-shaped loading pressure head 6b, a rotating clamp 6c and a toothed slideway 6 d. The knife-shaped head of the knife-shaped loading pressure head is clamped into the tooth-shaped groove of the tooth-shaped slide way, the thickness of the knife-shaped head of the knife-shaped loading pressure head is smaller than the opening width of the tooth-shaped groove, and the purpose is that the tooth-shaped slide way rotates by taking the top of the knife-shaped head of the knife-shaped loading pressure head in the tooth-shaped groove as a fulcrum in the loading process.
The pneumatic loading assembly 4 further comprises a backing plate 4a, a fixing clamp 4b and a cylinder 4 c. The backing plate is connected with the sliding end rigid base, and the air cylinder is fixed on the backing plate through a fixing clamp. The end part of the piston rod of the air cylinder is connected with the pressure sensor through the partition plate.
The gas charging system is connected with the cylinder 4c through a high-pressure gas pipe. The conduit is connected with a check valve 8 for controlling the communication and the blockage of the cylinder and the gas pressurizing system. The gas pressurizing system can set a target pressurizing level for the cylinder, and when the pressure in the cylinder reaches a target pressure value, the gas pressurizing system automatically stops pressurizing and maintains the pressure value in the cylinder unchanged.
Subassembly 7 is applyed to stiff end load is fixed on stiff end rigid base 3, including arc track 6a, sword shape loading pressure head 6b, rotation anchor clamps 6c, profile of tooth slide 6d and adjustable fixed plate 7 b. The rotary clamp clamps the other end of the test piece, and the tail end of the knife-shaped loading pressure head is fixed on the rigid base of the fixed end through the adjustable fixing plate.
When the axial force and the bending moment are applied, the target pressurizing level of the air cylinder is set through the air pressurizing system according to the axial force and the bending moment which need to be applied, the air pressurizing system automatically stops pressurizing when the pressure in the air cylinder reaches a target pressure value, the pressure in the air cylinder is maintained to be constant, and the check valve is closed. In the pressurizing process, a piston rod in the cylinder extends outwards along with the rising of the air pressure in the cylinder, and drives the pressure sensor, a knife-shaped loading pressure head of the sliding bending moment applying assembly and a tooth-shaped slideway to slide forwards, the tooth-shaped slideway rotates by taking the top of a knife-shaped head of the knife-shaped loading pressure head in the tooth-shaped groove as a fulcrum, so that the test piece is subjected to the action of axial pressure and bending moment at one end, meanwhile, the fixed end load applying assembly can provide corresponding reaction force (including the axial pressure and the bending moment) for the test piece at the other end of the test piece, and the test piece is subjected to bending deformation, so that the axial force and the bending moment are pre-applied to the test piece.
The bending moment applying assembly can flexibly adjust the level of axial output pressure and the eccentricity of the knife-shaped loading pressure head embedded into different positions of the toothed track, and various initial axial forces and bending moment working condition combinations are realized.
In the process of pressurizing the cylinder, the dynamic acquisition instrument respectively measures and records the pressure of the piston rod of the cylinder to the pressure sensor (namely the axial pressure value on two end parts of the test piece) and the axial displacement of the two end parts of the test piece in real time through the pressure sensor and the displacement meter and displays the pressure and the axial displacement on the computer terminal in real time;
the non-contact strain displacement measuring instrument measures and records the deflection of the middle part of the test piece in real time and displays the deflection on a computer terminal in real time.
The test method of the test piece fixing device for pre-applying axial force and bending moment in cooperation with the impact test comprises the following steps:
firstly, adjusting the positions of a sliding end load applying component and a fixed end load applying component according to the length of a test piece, and respectively fixing the two ends of the test piece on clamps of two end loading components;
secondly, adjusting the positions of the knife-shaped loading pressure heads of the load applying assemblies at two ends on the tooth-shaped slide ways;
thirdly, starting the dynamic acquisition instrument, the pressure sensor, the displacement sensor and the computer terminal, and starting to record and display the pressure applied to the end part of the test piece and the axial displacement of the end part in real time by the computer terminal; opening a check valve, setting a target pressurizing level of a gas pressurizing system according to the axial force and the bending moment required by the test, starting equipment to start pressurizing, automatically stopping pressurizing by the gas pressurizing system when the pressure in the cylinder reaches the target pressure and maintaining the pressure value in the cylinder unchanged, closing the check valve, and finishing the preloading of the test piece after the pressurizing is finished;
and fourthly, starting the non-contact strain displacement measuring instrument and the computer terminal, and starting the computer terminal to record and display the deflection of the middle part of the test piece in real time. Adjusting the pendulum bob to a target height, releasing the pendulum bob, finishing the impact on the test piece by the pendulum bob, simultaneously recording the external pressure, the axial displacement and the deflection change in the middle of the test piece in real time in the whole impact process by a data acquisition system, displaying the recorded changes on a computer terminal, synchronously storing the axial force and the bending moment at any position in the axial direction of the test piece in real time according to an axial force and bending moment formula (1), and displaying the stored axial force and bending moment on the computer terminal;
the symbols in the formula are interpreted:
n: the axial force is measured by the load sensor and the data acquisition system;
N1(t),N2(t): axial force of upper and lower ends of test piece caused by axial load；
e1,e2: the upper end and the lower end of the test piece correspond to the eccentricity;
M1(t),M2(t): bending moment caused by axial load at the upper end and the lower end of the test piece.
And fifthly, printing out test data, closing the equipment and disassembling the impacted test piece.
The foregoing is considered to be merely illustrative of the spirit and principles of the invention, and any modifications, equivalents, improvements and the like which fall within the scope of the invention are intended to be included therein.
Other technical features than those described in the specification are known to those skilled in the art, and are not described in detail herein in order to highlight the novel features of the present invention.
Claims (5)
1. The utility model provides an impact experimental method of axial force, moment of flexure in advance, its characterized in that adopts the test piece fixing device of axial force, moment of flexure in advance, and the device includes: the device comprises a rigid base, a sliding end load applying assembly, a fixed end load applying assembly, a pendulum bob, a test piece, a data acquisition system and a computer terminal, wherein the rigid base comprises a sliding end rigid base and a fixed end rigid base; the experimental method comprises the following steps:
firstly, adjusting the positions of a sliding end load applying component and a fixed end load applying component according to the length of a test piece, and respectively fixing the two ends of the test piece on clamps of the two end load applying components;
secondly, calculating the eccentricity of two ends of the test piece according to the numerical values of the pre-applied axial force and the bending moment, and adjusting the position of a knife-shaped loading pressure head of the load applying assembly at two ends on the tooth-shaped slideway according to the eccentricity;
thirdly, starting the dynamic acquisition instrument, the pressure sensor, the displacement meter and the computer terminal, and starting to record and display the pressure applied to the end part of the test piece and the axial displacement of the end part in real time by the computer terminal; opening a check valve, setting a target pressurizing level of a gas pressurizing system according to the axial force and the bending moment required by the test, starting equipment to start pressurizing, automatically stopping pressurizing by the gas pressurizing system when the pressure in the cylinder reaches the target pressure, keeping the pressure value in the cylinder unchanged, closing the check valve, and finishing preloading of the test piece after the pressurizing is finished;
fourthly, starting the non-contact strain displacement measuring instrument and the computer terminal, starting the computer terminal to record and display the deflection of the middle part of the test piece in real time, adjusting the pendulum bob to the target height, releasing the pendulum bob, finishing the impact on the test piece by the pendulum bob, simultaneously recording and displaying the external pressure, the axial displacement and the deflection of the middle part of the test piece on the computer terminal in real time by the data acquisition system in the whole impact process, and synchronously displaying the axial force and the end bending moment of any position in the axial direction of the test piece on the computer terminal in real time according to an axial force and bending moment formula;
fifthly, printing and outputting test data, closing the equipment, and disassembling the impacted test piece;
the sliding bending moment applying assembly further comprises an arc-shaped track, a knife-shaped loading pressure head, a rotating clamp and a tooth-shaped slideway, wherein the rotating clamp clamps one end of a test piece, a knife-shaped head of the knife-shaped loading pressure head is embedded into a tooth-shaped groove of the tooth-shaped slideway, the thickness of the knife-shaped head of the knife-shaped loading pressure head is smaller than the opening width of the tooth-shaped groove, and the tooth-shaped slideway rotates by taking the top of the knife-shaped head of the knife-shaped loading pressure head in the tooth-shaped groove as a fulcrum in the loading process;
the pneumatic loading assembly further comprises a base plate, an air cylinder and a fixing clamp, the base plate is connected with the sliding end rigid base, the air cylinder is fixed on the base plate through the fixing clamp, the end part of a piston rod of the air cylinder is connected with the pressure sensor through a partition plate, the air cylinder in the pneumatic loading assembly can work independently without being assembled with a bending moment applying assembly, and experimental research of a test piece under simple axial force loading is realized;
the gas pressurizing system is connected with the cylinder through a high-pressure gas pipe, a check valve used for controlling the communication and blocking of the cylinder and the gas pressurizing system is connected to the high-pressure gas pipe, the gas pressurizing system can set a target pressurizing level for the cylinder, and when the pressure in the cylinder reaches a target pressure value, the gas pressurizing system automatically stops pressurizing and maintains the pressure value in the cylinder unchanged.
2. The impact experiment method of pre-applied axial force and bending moment as claimed in claim 1, wherein: the sliding shaft force loading assembly further comprises a sliding barrel, a partition plate, a pressure sensor and a protective cover.
3. The impact experiment method of pre-applied axial force and bending moment as claimed in claim 1, wherein: the fixed end load applying assembly comprises an arc-shaped track, a knife-shaped loading pressure head, a rotating clamp, a tooth-shaped slideway and an adjustable fixing plate, wherein the rotating clamp clamps the other end of the test piece, and the tail end of the knife-shaped loading pressure head is fixed on the rigid base of the fixed end through the adjustable fixing plate.
4. The impact experiment method of pre-applied axial force and bending moment as claimed in claim 1, wherein: the data acquisition system comprises a pressure sensor, a displacement sensor, a dynamic acquisition instrument, a non-contact strain displacement measurement instrument and a computer terminal, wherein the pressure sensor and the displacement sensor are connected with the dynamic acquisition instrument through a data transmission line, the dynamic acquisition instrument and the non-contact strain displacement measurement instrument are in communication connection with the computer terminal through the data transmission line, the data acquisition system records and displays the external pressure, the axial displacement and the deflection change of the middle part of the test piece in the whole impact process in real time, and synchronously stores and displays the axial force and the bending moment caused by the axial pressure at the end part of the test piece in real time at the computer terminal according to an axial force and bending moment calculation formula.
5. The impact experiment method of pre-applied axial force and bending moment as claimed in claim 1, wherein: the bending moment applying assembly can flexibly adjust the level of axial output pressure and the eccentricity of the knife-shaped loading pressure head embedded into different positions of the tooth-shaped slideway, and various initial axial forces and bending moment working condition combinations are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910897209.5A CN110618044B (en) | 2017-06-22 | 2017-06-22 | Impact experiment method for pre-adding axial force and bending moment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710480859.0A CN107101881B (en) | 2017-06-22 | 2017-06-22 | The impact experiment apparatus and its experimental method of a kind of brace pre axial force, moment of flexure |
| CN201910897209.5A CN110618044B (en) | 2017-06-22 | 2017-06-22 | Impact experiment method for pre-adding axial force and bending moment |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710480859.0A Division CN107101881B (en) | 2017-06-22 | 2017-06-22 | The impact experiment apparatus and its experimental method of a kind of brace pre axial force, moment of flexure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110618044A CN110618044A (en) | 2019-12-27 |
| CN110618044B true CN110618044B (en) | 2021-11-09 |
Family
ID=59663451
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710480859.0A Active CN107101881B (en) | 2017-06-22 | 2017-06-22 | The impact experiment apparatus and its experimental method of a kind of brace pre axial force, moment of flexure |
| CN201910897209.5A Active CN110618044B (en) | 2017-06-22 | 2017-06-22 | Impact experiment method for pre-adding axial force and bending moment |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710480859.0A Active CN107101881B (en) | 2017-06-22 | 2017-06-22 | The impact experiment apparatus and its experimental method of a kind of brace pre axial force, moment of flexure |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN107101881B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030203A (en) * | 2018-06-27 | 2018-12-18 | 大连理工大学 | Flexible fabric yarn extracts experimental provision and its working method |
| CN109187236A (en) * | 2018-07-27 | 2019-01-11 | 南京航空航天大学 | It is a kind of to apply the high speed impact experimental rig preloaded and method |
| CN109540448B (en) * | 2018-11-30 | 2021-01-19 | 安徽威成精密铸造有限公司 | Filter quality detection knocking test device |
| CN112945738B (en) * | 2021-01-29 | 2022-08-09 | 中国原子能科学研究院 | Mechanical test device |
| CN114527015B (en) * | 2022-02-14 | 2023-11-10 | 哈尔滨工业大学 | Pure torsion creep test device suitable for multiple-size combined components and test method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308404A (en) * | 2013-06-14 | 2013-09-18 | 吉林大学 | In-situ nano-indentation tester based on adjustable stretching-bending preload |
| CN103543010A (en) * | 2013-10-11 | 2014-01-29 | 西安交通大学 | High-speed screw and screw pair comprehensive examination test bed |
| CN104075943A (en) * | 2014-06-30 | 2014-10-01 | 天地科技股份有限公司 | Test bed for testing integrated mechanical properties of anchor rod and test method |
| CN106644349A (en) * | 2017-03-07 | 2017-05-10 | 山东科技大学 | Multifunctional impact experiment platform and method capable of continuously applying axial force |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2470022Y (en) * | 2001-06-20 | 2002-01-09 | 曹云明 | Multipurpose hydraulic pipe bender |
| CN201285362Y (en) * | 2008-10-22 | 2009-08-05 | 宝山钢铁股份有限公司 | Bending fatigue experiment apparatus for band steel weld seam |
| CN202916152U (en) * | 2012-10-23 | 2013-05-01 | 中国石油天然气集团公司 | Single-bend pressure test device |
| CN203621328U (en) * | 2013-12-03 | 2014-06-04 | 国家电网公司 | Portable grounded round steel bending machine |
| CN203908883U (en) * | 2014-04-25 | 2014-10-29 | 西安三维应力工程技术有限公司 | Bending fatigue test device for oil casing under combined load |
| CN105823398B (en) * | 2016-05-10 | 2018-09-04 | 大连理工大学 | A kind of novel ocean engineering compliance umbilical minimum bending radius test device and method |
| CN106124319B (en) * | 2016-08-08 | 2020-09-01 | 中国电力科学研究院有限公司 | Bending moment active control test system and method |
-
2017
- 2017-06-22 CN CN201710480859.0A patent/CN107101881B/en active Active
- 2017-06-22 CN CN201910897209.5A patent/CN110618044B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308404A (en) * | 2013-06-14 | 2013-09-18 | 吉林大学 | In-situ nano-indentation tester based on adjustable stretching-bending preload |
| CN103543010A (en) * | 2013-10-11 | 2014-01-29 | 西安交通大学 | High-speed screw and screw pair comprehensive examination test bed |
| CN104075943A (en) * | 2014-06-30 | 2014-10-01 | 天地科技股份有限公司 | Test bed for testing integrated mechanical properties of anchor rod and test method |
| CN106644349A (en) * | 2017-03-07 | 2017-05-10 | 山东科技大学 | Multifunctional impact experiment platform and method capable of continuously applying axial force |
Non-Patent Citations (1)
| Title |
|---|
| 乘员股骨在轴向压力-弯矩下的损伤生物力学机理研究;蒋小晴 等;《力学学报》;20140531;第46卷(第3期);第465-474页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107101881A (en) | 2017-08-29 |
| CN110618044A (en) | 2019-12-27 |
| CN107101881B (en) | 2019-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110618044B (en) | Impact experiment method for pre-adding axial force and bending moment | |
| CN206479410U (en) | A kind of pressure bringing device | |
| CN203025327U (en) | Testing device for linear stepping motor | |
| CN102998174A (en) | Long-term loading apparatus system for concrete sample durability tests | |
| CN102539261B (en) | Steel tube bending deformation testing system | |
| CN110243513A (en) | Ball screw assembly, efficiency detection device | |
| CN106644425B (en) | Comprehensive measuring device for longitudinal, transverse and vertical three-way resistance of steel rail fastener | |
| CN110044729A (en) | A kind of rock tensile shear(ing) test device and method based on true triaxial | |
| CN105115835A (en) | Shearing test device for simulating rock structural plane failure and method | |
| CN204027952U (en) | Mortar penetrometer calibrating installation | |
| CN113310799A (en) | In-situ mechanics dynamic observation equipment under ultralow strain rate | |
| CN102103065A (en) | Device for calibrating extraction instrument | |
| LU101322B1 (en) | Test device for mechanical properties of interface between pile and soil | |
| CN106644329B (en) | 120MN bridge support testing machine for high-precision dynamic measurement | |
| CN213544265U (en) | Dynamic three-point bending testing device capable of being adjusted in multiple directions | |
| CN202649055U (en) | Wood bending strength detecting equipment for structure | |
| CN206420718U (en) | Electric-liquid type pressure test machine | |
| CN209911105U (en) | Structural test loading device capable of keeping lateral direction and axial direction vertical | |
| CN102419225A (en) | Elasticity detection device for plate spring and method for detecting plate spring by using same | |
| NL2023629B1 (en) | Test device for shearing mechanical properties of interface between pile and soil | |
| CN104613847A (en) | Automobile seat slide gap detecting device | |
| CN201917497U (en) | Swing fatigue testing machine | |
| CN109540701B (en) | Be applied to rock shear test's LVDT displacement sensor fixed establishment | |
| CN102680153A (en) | Special equipment for torque testing and static pressure testing of laminated spring set | |
| DE102011115478A1 (en) | Geotechnical device for performing deformation measurements at pile head of foundation pile, horizontal loads which are placed over the pressure cylinders |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |