CN208383622U - Homalographic different cross section beam Crush tests device - Google Patents
Homalographic different cross section beam Crush tests device Download PDFInfo
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- CN208383622U CN208383622U CN201820310079.1U CN201820310079U CN208383622U CN 208383622 U CN208383622 U CN 208383622U CN 201820310079 U CN201820310079 U CN 201820310079U CN 208383622 U CN208383622 U CN 208383622U
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- pressure head
- load pressure
- homalographic
- test specimen
- different cross
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Abstract
The utility model discloses homalographic different cross section beam Crush tests devices, are related to material mechanics experiment apparatus field, by quantitative determining the bending resistance that can intuitively compare cross-section area different shape and cut section bar, reinforce experiment teaching effect.The utility model includes: test specimen, positioning plate, support rigid frame, locating slot, bracket, loading system, load cell, load pressure head, power display instrument, amesdial and bracket.It loads pressure head to push, the deformation component amount of deflection of test specimen is obtained by amesdial measurement, and bending strain forms measuring bridge by the resistance strain gage being pasted on test specimen and measures, and corner by obtaining indirectly with amount of deflection relational expression.The utility model leaves deep understanding to student by quantitative test, to have more profound understanding to deflection of beam deformation, improves the efficiency of explanation.
Description
Technical field
The utility model relates to material mechanics experiment apparatus field more particularly to homalographic different cross section beam Crush tests
Device.
Background technique
Experimental teaching is the important component of higher education, to culture have higher overall qualities the talent play it is important
Effect.To enable student preferably to grasp the basic skills and technical ability of experimental study, there is the independent energy for carrying out experimental study
Power actively develops research reality currently, domestic university has started to explore the classical replication experiment of transformation in experimental teaching
It tests.
" homalographic different cross section bending experiment of beam " is by quantitative determination homalographic but the deflection of beam of different shape section
Which kind of deformation displacement component and bending stress study and cut section bar more bending resistance.This knowledge point is in theory of mechanics of materials teaching
And it is bad go to understand, if only student is allowed to carry out theory deduction and draw a conclusion to bring to student how many deep to recognize
Know.
For the knowledge point, lacks the test equipment for capableing of visual verification and understanding in the prior art, be unfavorable for student couple
Deflection of beam deforms concept and carries out profound understanding.
Utility model content
The utility model provides homalographic different cross section beam Crush tests device, can be intuitive by quantitative determination
Compare the bending resistance that cross-section area different shape cuts section bar, reinforces experiment teaching effect.
In order to achieve the above objectives, the utility model adopts the following technical solution:
Homalographic different cross section beam Crush tests device, the utility model include: test specimen, positioning plate, support rigid frame, determine
Position slot, frame supported on both sides, loading system, load cell, the first load pressure head, the second load pressure head, power display instrument, amesdial
And bracket.
Support rigid frame and locating slot are fixed on positioning plate, and loading system passes through the crossbeam of support rigid frame, and in end
The first load pressure head of installation or the second load pressure head, loading system can be moved left and right along support gantry beam, the first load
Perhaps the second load pressure head connection load cell first loads thousand points of setting immediately below pressure head or the second load pressure head to pressure head
Table and the bracket for supporting amesdial, test specimen are placed on frame supported on both sides, and frame supported on both sides is mounted in the notch of locating slot,
First load pressure head or the second load pressure head push, the pressuring method for the different modes that can press to test specimen.
The bracket of setting amesdial and support amesdial immediately below pressure head is loaded, test specimen is placed on bracket, load pressure
Head pushes, and presses to test specimen, and the deformation component amount of deflection of test specimen show that bending strain is by being pasted onto test specimen by amesdial measurement
On resistance strain gage group measuring bridge method measure, corner by obtaining indirectly with amount of deflection relational expression.
Further, the size of load cell attachment force display instrument, load pressure head pressure applied can be shown immediately
Show.
Further, rigid frame and locating slot is supported to be fixed on positioning plate, positioning plate can protect compensator or trimmer pressure, Protection
Platform, while also facilitating the movement of experimental provision.
Further, the design of the first load pressure head avoids the foil gauge immediately below it on beam.Both guarantee to play pressurization
Effect, and do not interfere with the measurement of bending strain.
Further, the shape of test specimen includes: rectangle, circular shaft, thin-wall circular tube and the I-beam of same sectional area.
Further, frame and bracket supported on both sides can move left and right in locating slot, to adapt to the test specimen of different length.
The beneficial effects of the utility model are: load pressure head presses to test specimen of different shapes in the utility model, pass through
Amesdial intuitively shows test specimen amount of deflection deformed condition；The bending strain of test specimen is intuitively shown by static resistance deformeter,
By intuitively testing, it is easy to obtain conclusion (of pressure testing): the moment of inertia is bigger, and bending stiffness is bigger, and bending deformation is smaller, amount of deflection,
Corner and bending stress are all smaller；A very deep understanding is left to student by quantitative test, thus to deflection of beam
Deforming this concept has a more profound understanding, improves the efficiency of explanation.
Detailed description of the invention
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is the structure chart of the utility model embodiment；
Fig. 2 is the amount of deflection and corner schematic diagram of beam；
Fig. 3 is simply supported beam midpoint compression bending moment diagram；
Fig. 4 is bending strain bridge connection；
Fig. 5 is different shape schematic cross-section.
Wherein, test specimen 1, positioning plate 2, support rigid frame 3, locating slot 4, frame supported on both sides 5, loading system 6, load cell
7, the first load pressure head 8, second loads pressure head 9, power display instrument 10, amesdial 11 and bracket 12.
Specific embodiment
To make those skilled in the art more fully understand the technical solution of the utility model, With reference to embodiment
The utility model is described in further detail.
The utility model embodiment provides homalographic different cross section beam Crush tests device, as shown in Figure 1, comprising: examination
Part 1, positioning plate 2, support rigid frame 3, locating slot 4, frame supported on both sides 5, loading system 6, load cell 7, first load pressure head
8, the second load pressure head 9, power display instrument 10, amesdial 11 and bracket 12.
Installation support rigid frame 3 and locating slot 4, support the load hand installed and can slided on the crossbeam of rigid frame 3 on positioning plate 2
Wheel 6, the end of loading system 6 pass through crossbeam, and the first load pressure head 8 of installation and the second load pressure head 9, load cell 7 connect
First load pressure head 8 or the second load pressure head 9,7 transmission measurement value of load cell to power display instrument 10, power display instrument 10 are real-time
Show the pressure value applied.
Frame 5 and bracket 12 supported on both sides are mounted in the notch of locating slot 4, and can be moved left and right.It is installed on bracket 12
Amesdial 11, installs test specimen 1 on frame 5 supported on both sides, test specimen 1 be located at the first load pressure head 8 or the second load pressure head 9 just under
Side.When the first load pressure head 8 or the second load pressure head 9 push, amesdial 11 tests the amount of deflection of the bending deformation displacement of test specimen 1
Component.Bending strain is measured by the resistance strain gage group measuring bridge being pasted on test specimen 1.Test specimen 1 is used in experiment
Beam.
The experiment purpose of homalographic different cross section bending experiment of beam is: being cut section bar by quantitative determining homalographic different shape
Bending deformation displacement component and bending stress, which kind of is studied and is cut section bar more bending resistance.The utility model is various not by measurement
The amount of deflection when beam deflection of similar shape section, two displacement components of corner and bending stress study the bending resistance of beam.
The test principle of homalographic different cross section bending experiment of beam is:
Beam will be by will generate bending deformation after external force.In plain bending, the axis of beam is in the main inertia of centroid
A plane curve, the referred to as line of deflection of beam are curved in plane.Deflection of beam deformation can use amount of deflection ω and rotational angle theta two displacements point
Metric.
Any point c is in the displacement cc ' perpendicular to x-axis direction, the referred to as amount of deflection of the point on the axis of amount of deflection ω beam, with ω table
Show.
Rotational angle theta is according to the hypothesis of plane mechanism, and after beam deformation, any cross section will turn over an angle, this angle around neutral axis
Degree is known as the corner in the section, with indicating θ.
Simply supported beam, as shown in Fig. 2, by the concentrfated load F for acting on midpoint, compression bending moment diagram is as shown in Figure 3.
When simply supported beam cross section is respectively with the rectangle of homalographic, circular shaft, thin-wall circular tube and I-beam, when beam is by
Deflection of beam deformation component is measured after concentrfated load at point.Deformation component includes amount of deflection and corner.Amount of deflection is straight by amesdial
It connects and measures, bending strain is measured by the resistance strain gage group electric bridge being pasted on test specimen, and corner passes through between amount of deflection relational expression
It connects and measures.
Simply supported beam material selection aluminium alloy, E=72GPa, L=0.4m, A=100 π mm2, Δ F=500N, FP=4710N,
σp=150MPa.(remarks: E is the elasticity modulus of material for test, and L is piece lengths, and A is test specimen area of section, and △ F is experiment
Every grade of increased force value in the process, FPFor elastic range maximal force, σpElastic stress)
Bending strain is measured by the resistance strain gage group measuring bridge being pasted on test specimen, and the selection of bridge connection type is single
Arm half-bridge compensates connection, as shown in Figure 4.
ε1=εM+εt ε2=εt
εd=ε1-ε2=εM
σM=E εd
Wherein, ε1For the strain generated on bridge arm 1, ε2For the strain generated on bridge arm 2, εdFor reading strain, σMFor bending
Stress.)
The schematic cross-section of homalographic different cross section beam is as shown in Figure 5.
Experiment is by way of multistage loadings, and preload F0Every grade of load Δ F=500N of=50N, various different cross section beams
Average amount of deflection, average corner, mean strain are shown in Table 1~table 3:
1 homalographic different cross section beam deflection experiment value of table and theoretical value relative error
2 homalographic different cross section beam corner experiment value of table and theoretical value relative error
The faces different cross section beam deflection stress test values such as table 3 and theoretical value relative error
Found out by table 1 to table 3, within 10%, the main reason for error includes: the relative error of experiment value and theoretical value
The error of test specimen size in process；The position of load(ing) point is not accurately to cooperate very much；Measurement is tied in the drift of deformeter
Fruit can also have an impact.
The beneficial effects of the utility model are: load pressure head presses to test specimen of different shapes, it is intuitive by amesdial
Show test specimen amount of deflection deformed condition；The bending strain that test specimen is intuitively shown by static resistance deformeter, by intuitively trying
Test, it is easy to obtain conclusion (of pressure testing): the moment of inertia is bigger, and bending stiffness is bigger, and bending deformation is smaller, and amount of deflection, corner and bending are answered
Power is all smaller；A very deep understanding is left to student by quantitative test, to deform this concept to deflection of beam
There is a more profound understanding, improves the efficiency of explanation.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, the change that can be readily occurred in
Change or replace, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with power
Subject to the protection scope that benefit requires.
Claims (6)
1. homalographic different cross section beam Crush tests device characterized by comprising test specimen (1), positioning plate (2), support are rigid
Frame (3), locating slot (4), frame supported on both sides (5), loading system (6), load cell (7), the first load pressure head (8), second
Load pressure head (9), power display instrument (10), amesdial (11) and bracket (12)；
Support rigid frame (3) and locating slot (4) are fixed on positioning plate (2), and loading system (6) passes through the crossbeam of support rigid frame (3),
And the first load pressure head (8) of installation or the second load pressure head (9), loading system (6) can be along supports rigid frame (3) in end
Crossbeam moves left and right, the first load pressure head (8) or the second load pressure head (9) connection load cell (7), the first load pressure head
(8) or immediately below the second load pressure head (9) bracket (12) of setting amesdial (11) and support amesdial, test specimen (1) are put
Set on frame supported on both sides (5), frame (5) supported on both sides is mounted in the notch of locating slot (4), first load pressure head (8) or
Second load pressure head (9) pushes, the pressuring method for the different modes that can press to test specimen (1).
2. homalographic different cross section beam Crush tests device according to claim 1, which is characterized in that load cell
(7) attachment force display instrument (10).
3. homalographic different cross section beam Crush tests device according to claim 1, which is characterized in that support rigid frame
(3) it is fixed on positioning plate (2) with locating slot (4).
4. homalographic different cross section beam Crush tests device according to claim 1, which is characterized in that the first load pressure
The design of head (8) avoids the foil gauge immediately below it on beam.
5. homalographic different cross section beam Crush tests device according to claim 1, which is characterized in that test specimen (1)
Shape includes: rectangle, circular shaft, thin-wall circular tube and the I-beam of same area of section.
6. homalographic different cross section beam Crush tests device according to claim 3, which is characterized in that frame supported on both sides
(5) it is moved left and right in locating slot (4) with bracket (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820310079.1U CN208383622U (en) | 2018-03-06 | 2018-03-06 | Homalographic different cross section beam Crush tests device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820310079.1U CN208383622U (en) | 2018-03-06 | 2018-03-06 | Homalographic different cross section beam Crush tests device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208383622U true CN208383622U (en) | 2019-01-15 |
Family
ID=64974904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820310079.1U Expired - Fee Related CN208383622U (en) | 2018-03-06 | 2018-03-06 | Homalographic different cross section beam Crush tests device |
Country Status (1)
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| CN (1) | CN208383622U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813194A (en) * | 2019-01-24 | 2019-05-28 | 苏州雅泛迪铝业有限公司 | Steel plate deflection detecting jig |
| CN110031332A (en) * | 2019-04-29 | 2019-07-19 | 西南大学 | A kind of test method of boardness |
| CN110849709A (en) * | 2019-12-11 | 2020-02-28 | 河南工程学院 | Supporting seat for simply supported beam bending test and simply supported beam bending test device |
| CN111238959A (en) * | 2020-02-27 | 2020-06-05 | 黄山学院 | Bending property testing device of material |
| CN111649884A (en) * | 2020-06-12 | 2020-09-11 | 国网山东省电力公司电力科学研究院 | Device for testing mechanical property of angle steel reinforcing member of power transmission tower |
| CN111829878A (en) * | 2020-06-04 | 2020-10-27 | 国网山东省电力公司电力科学研究院 | Mechanical property testing device and method for angle steel reinforcing member of power transmission tower |
| CN113380122A (en) * | 2021-06-08 | 2021-09-10 | 北京工商大学 | Beam bending deformation simulation system based on engineering complex working conditions in material mechanics teaching |
| CN113740177A (en) * | 2021-07-21 | 2021-12-03 | 中电建路桥集团有限公司 | Steel box girder bending measurement performance detection device for road and bridge construction |
-
2018
- 2018-03-06 CN CN201820310079.1U patent/CN208383622U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813194A (en) * | 2019-01-24 | 2019-05-28 | 苏州雅泛迪铝业有限公司 | Steel plate deflection detecting jig |
| CN110031332A (en) * | 2019-04-29 | 2019-07-19 | 西南大学 | A kind of test method of boardness |
| CN110849709A (en) * | 2019-12-11 | 2020-02-28 | 河南工程学院 | Supporting seat for simply supported beam bending test and simply supported beam bending test device |
| CN110849709B (en) * | 2019-12-11 | 2022-02-08 | 河南工程学院 | Supporting seat for simply supported beam bending test and simply supported beam bending test device |
| CN111238959A (en) * | 2020-02-27 | 2020-06-05 | 黄山学院 | Bending property testing device of material |
| CN111829878A (en) * | 2020-06-04 | 2020-10-27 | 国网山东省电力公司电力科学研究院 | Mechanical property testing device and method for angle steel reinforcing member of power transmission tower |
| CN111649884A (en) * | 2020-06-12 | 2020-09-11 | 国网山东省电力公司电力科学研究院 | Device for testing mechanical property of angle steel reinforcing member of power transmission tower |
| CN113380122A (en) * | 2021-06-08 | 2021-09-10 | 北京工商大学 | Beam bending deformation simulation system based on engineering complex working conditions in material mechanics teaching |
| CN113740177A (en) * | 2021-07-21 | 2021-12-03 | 中电建路桥集团有限公司 | Steel box girder bending measurement performance detection device for road and bridge construction |
| CN113740177B (en) * | 2021-07-21 | 2024-02-02 | 中电建路桥集团有限公司 | Bending performance detection device for steel box girder for road bridge construction |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190115 Termination date: 20210306 |
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| CF01 | Termination of patent right due to non-payment of annual fee |