CN203260238U - Demonstration teaching tool of pure bending deformation of beam - Google Patents
Demonstration teaching tool of pure bending deformation of beam Download PDFInfo
- Publication number
- CN203260238U CN203260238U CN 201320266614 CN201320266614U CN203260238U CN 203260238 U CN203260238 U CN 203260238U CN 201320266614 CN201320266614 CN 201320266614 CN 201320266614 U CN201320266614 U CN 201320266614U CN 203260238 U CN203260238 U CN 203260238U
- Authority
- CN
- China
- Prior art keywords
- demonstration
- section
- pure bending
- scratch
- cut
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Instructional Devices (AREA)
Abstract
The utility model discloses a demonstration teaching tool of pure bending deformation of a beam. The demonstration teaching tool is made of an elastic rubber bar and comprises a central demonstration segment (1) and holding segments (2) on left and right sides of the central demonstration segment (1); the cross section of each of the holding segments (2) is in the shape of a circle; and the cross section area of each of the holding segments (2) is smaller than that of the central demonstration segment (1); a first horizontal scratch (aa), a second horizontal scratch (bb), a first longitudinal scratch (cc) and a second longitudinal scratch (dd) are arranged in the external surface of the central demonstration segment (1); and the first horizontal scratch (aa), the second horizontal scratch (bb), the first longitudinal scratch (cc) and the second longitudinal scratch (dd) is formed a rectangular frame. The beam is replaced by the elastic rubber rod, the demonstration teaching tool is capable of clearly and vividly demonstrating force-bearing situation of the beam after the pure bending deformation occurs, and the demonstration teaching tool is simple in structure, easy to operate and low in cost and is capable of being reused.
Description
Technical field
The utility model relates to teaching aid, when being used for demonstration beam generation pure bending distortion, and the teaching aid of the stressing conditions of beam.
Background technology
In the theory teaching process of " mechanics of materials ", when relating to explanation beam generation pure bending distortion, the stressing conditions of beam.Only depend on the theoretical student of lecturing to be not easy to understand during teaching, with the real process demonstration, its time is long, and cost is high; Employing multimedia courseware demonstration, it is untrue, directly perceived lively that the student feels, usually can not reach the effect of hope, and make multimedia courseware and also need spend many times, makes troubles for teacher's teaching.
The utility model content
The purpose of this utility model is to provide a kind of simple in structure, low cost of manufacture, and repeatedly used demonstration teaching aid can be demonstrated beam generation pure bending when distortion intuitively, visually, and the stressing conditions of beam is so that observation of students, understanding.
For reaching above-mentioned purpose, the utility model provides a kind of demonstration teaching aid of beam generation pure bending distortion, made by the elastic caoutchouc rod, demonstration section in the middle of comprising, and demonstration Duan Zuo in the middle of being positioned at, the holding section of right both sides, the xsect of described holding section is circular, and the cross-sectional area of holding section is less than the cross-sectional area of centre demonstration section, outside surface in described middle demonstration section is provided with the first horizontal cut, the second horizontal cut, first vertical cut and second vertical cut, the described first horizontal cut, the second horizontal cut, first vertical cut and second vertical cut surround rectangle frame.
During teaching demonstration, both hands are held respectively the holding section of both sides, then firmly inwardly pull, similar pure bending of beam distortion can occur in rubber bar, find after crooked: (1) first horizontal cut and the second horizontal cut still are straight line, still vertical with first vertical cut, second vertical cut, but relatively rotate; (2) first vertical cuts and second vertical cut become curve, are positioned at second inboard vertical cut and shorten, and are positioned at first vertical cut elongation in the outside.The student can find by observing, although the first horizontal cut and the second horizontal cut relatively rotate, but still is straight line, so shear stress is zero, and first vertical cut and second vertical cut only are subject to axial compression or stretching, and shear stress also is zero.By above process, in the time of can experiencing more intuitively beam generation pure bending distortion, the stressing conditions of beam.
Be preferably, the outside surface of described holding section is anti-skidding wire side, skids when preventing from gripping.
The xsect of demonstration section is circular in the middle of described, and the axis of middle demonstration section and the dead in line of holding section.
The xsect of demonstration section is rectangle in the middle of described, and the center line of middle demonstration section and the dead in line of holding section.
The beneficial effects of the utility model are: this demonstration teaching aid utilizes the elastic caoutchouc rod to replace beam, can show intuitively, visually the stressing conditions after beam generation pure bending is out of shape, so that observation of students, understanding and grasp its change procedure and principle, but and simple in structure, easy to operate, the low Reusability of cost.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the state after the utility model generation pure bending distortion.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
The demonstration teaching aid of beam generation pure bending distortion as shown in Figure 1 adopts the elastic caoutchouc rod to make, and by centre demonstration section 1, and the holding section 2 of demonstration section 1 arranged on left and right sides consists of in the middle of being positioned at.Middle demonstration section 1 is used for the stressing conditions of demonstration beam generation pure bending distortion, and holding section 2 is used for demonstrator's hands grasping.The xsect of holding section 2 is circular, and the cross-sectional area of holding section 2 is less than the cross-sectional area of centre demonstration section 1.Outside surface in centre demonstration section 1 is provided with the first horizontal cut aa, the second horizontal cut bb, first vertical cut cc and second vertical cut dd, and the described first horizontal cut aa, the second horizontal cut bb, first vertical cut cc and second vertical cut dd surround rectangle frame.Namely the first horizontal cut aa and the second horizontal cut bb are wide, between the upper and lower every arranging and being parallel to each other; First vertical cut cc and second vertical cut dd are contour, between left and right every arranging and be parallel to each other, thereby surround a rectangle frame.
Preferably, the outside surface of holding section 2 is anti-skidding wire side, prevents from skidding when the demonstrator from gripping.
A kind of preferred version is: the xsect of middle demonstration section 1 is for circular, and the axis of middle demonstration section 1 and the dead in line of holding section 2.
Another kind of preferred version is: the xsect of middle demonstration section 1 is rectangle, and the center line of middle demonstration section 1 and the dead in line of holding section 2.
Hold respectively the holding section of both sides when demonstrator's both hands, when then firmly inwardly pulling, pure bending distortion as shown in Figure 2 can occur in rubber bar, the first horizontal cut aa and the second horizontal cut bb still are straight line, still vertical with first vertical cut cc, second vertical cut dd, but relatively rotate; First vertical cut cc and second vertical cut dd become curve, are positioned at second inboard vertical cut dd and shorten, and are positioned at first vertical cut cc elongation in the outside.The student can find by observing, although the first horizontal cut aa and the second horizontal cut bb relatively rotate, but still is straight line, so shear stress is zero, and first vertical cut cc and second vertical cut dd only are subject to axial compression or stretching, and shear stress also is zero.By above process, in the time of can experiencing more intuitively beam generation pure bending distortion, the stressing conditions of beam.
Claims (4)
1. the demonstration teaching aid of beam generation pure bending distortion, it is characterized in that: made by the elastic caoutchouc rod, demonstration section (1) in the middle of comprising, and demonstration section (1) left side in the middle of being positioned at, the holding section of right both sides (2), the xsect of described holding section (2) is circular, and the cross-sectional area of holding section (2) is less than the cross-sectional area of centre demonstration section (1), outside surface in centre demonstration section (1) is provided with the first horizontal cut (aa), the second horizontal cut (bb), first vertical cut (cc) and second vertical cut (dd), the described first horizontal cut (aa), the second horizontal cut (bb), first vertical cut (cc) and second vertical cut (dd) surround rectangle frame.
2. the demonstration teaching aid of beam generation pure bending according to claim 1 distortion, it is characterized in that: the outside surface of described holding section (2) is anti-skidding wire side.
3. the demonstration teaching aid of beam generation pure bending according to claim 1 and 2 distortion is characterized in that: in the middle of described the xsect of demonstration section (1) for circular, and the axis of middle demonstration section (1) and the dead in line of holding section (2).
4. the demonstration teaching aid of beam generation pure bending according to claim 1 and 2 distortion, it is characterized in that: the xsect of demonstration section (1) is rectangle in the middle of described, and the center line of middle demonstration section (1) and the dead in line of holding section (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320266614 CN203260238U (en) | 2013-05-15 | 2013-05-15 | Demonstration teaching tool of pure bending deformation of beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320266614 CN203260238U (en) | 2013-05-15 | 2013-05-15 | Demonstration teaching tool of pure bending deformation of beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203260238U true CN203260238U (en) | 2013-10-30 |
Family
ID=49472784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320266614 Expired - Fee Related CN203260238U (en) | 2013-05-15 | 2013-05-15 | Demonstration teaching tool of pure bending deformation of beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203260238U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794118A (en) * | 2014-01-29 | 2014-05-14 | 肖挺松 | Two-dimensional large deformation demonstration instrument |
-
2013
- 2013-05-15 CN CN 201320266614 patent/CN203260238U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794118A (en) * | 2014-01-29 | 2014-05-14 | 肖挺松 | Two-dimensional large deformation demonstration instrument |
| CN103794118B (en) * | 2014-01-29 | 2015-12-16 | 肖挺松 | Two dimension large deformation demonstrator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203260238U (en) | Demonstration teaching tool of pure bending deformation of beam | |
| CN201910171U (en) | Solid geometry demonstration teaching aid | |
| CN204516157U (en) | A kind of College Maths probability model teaching aid | |
| CN204375306U (en) | A kind of bioconversion medium DNA double helical structure model | |
| CN204596263U (en) | Mathematical education pyramid apparatus for demonstrating | |
| CN203338636U (en) | Physical phenomenon teaching device | |
| CN203038519U (en) | Probability teaching tool for university teaching | |
| CN204680270U (en) | A kind of inertial demonstration device | |
| CN203070603U (en) | Plane figure demonstrator for university mathematics teaching | |
| CN203217838U (en) | Air pressure demonstration instrument | |
| CN203982663U (en) | The reaction unit of a kind of carbon dioxide and NaOH | |
| CN203013047U (en) | A probability model teaching aid used in mathematics teaching in a university | |
| CN203733373U (en) | Teaching aid demonstrating elliptic cone by using method of cut-off mark in advanced mathematics | |
| CN202584501U (en) | Inertia instrument | |
| CN204288605U (en) | Be applicable to Teaching of Economics to give lessons assistant teaching aid | |
| CN203325272U (en) | Abacus for mathematics teaching in primary schools | |
| CN203028512U (en) | Movable type training aid for teaching in political education course | |
| CN201600809U (en) | Plane geometry teaching aid | |
| CN201655096U (en) | Graph demonstration device | |
| CN203179334U (en) | X-banner dedicated for ideological and political theory courses | |
| CN202258018U (en) | Special teaching aid for tense learning during English teaching | |
| CN204946435U (en) | The empirical model of inspection rod member deformation plane hypothesis | |
| CN203588524U (en) | Solid circular shaft and hollow circular shaft anti-torsional deflection capability comparison and demonstration teaching aid | |
| CN204516172U (en) | A kind of friction force experimental teaching unit | |
| CN203331642U (en) | Teaching board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20150515 |
|
| EXPY | Termination of patent right or utility model |