JP2522822Y2 - Material testing machine - Google Patents
Material testing machineInfo
- Publication number
- JP2522822Y2 JP2522822Y2 JP1990053170U JP5317090U JP2522822Y2 JP 2522822 Y2 JP2522822 Y2 JP 2522822Y2 JP 1990053170 U JP1990053170 U JP 1990053170U JP 5317090 U JP5317090 U JP 5317090U JP 2522822 Y2 JP2522822 Y2 JP 2522822Y2
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- gripping
- testing machine
- material testing
- grip
- 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
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【考案の詳細な説明】 A.産業上の利用分野 本考案は、例えば布やフィルムあるいはベルト等の試
験片を把持するつかみ具を備えた材料試験機に関する。DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to a material testing machine provided with a gripper for gripping a test piece such as a cloth, a film, or a belt.
B.従来の技術 従来、材料試験機により布やフィルムあるいはベルト
等の滑り易い試験片の引張試験を行う際、第４図に示す
ような一対の平板状つかみ歯20a,20bをそれぞれ有する
上下つかみ具（図は上部つかみ具）を用いて試験片TPの
両端を把持するようにしている。つかみ歯20a,20bの把
持面は、全面がやすり目状、波目状あるいは平面状とさ
れる。B. Prior Art Conventionally, when performing a tensile test on a slippery test piece such as a cloth, a film, or a belt with a material testing machine, an upper and lower grip having a pair of flat grips 20a and 20b as shown in FIG. Both ends of the test piece TP are gripped using a tool (the upper grip is shown in the figure). The gripping surfaces of the gripping teeth 20a, 20b are entirely in the form of a file, a wave, or a plane.
C.考案が解決しようとする課題 しかしながら、強度の強い試験片TPの場合には、引張
試験時に試験片TPの被把持部に作用する応力の分布は図
示の如くなり、つかみ歯20a,20bの下端部に位置する場
合（最も試験片中心Ｐ側の部分であり点Ａで示す）に応
力集中が発生し易い。また、上下つかみ具の芯がずれる
と点Ａにおいて試験片TPに傷がつき易い。そのため、本
来ならば試験片TPの中央部で破断すべきものが点Ａで破
断（以下、チャック切れと呼ぶ）することが多く、正確
な試験結果が得られないという問題があった。C. Problems to be solved by the invention However, in the case of a test piece TP having a strong strength, the distribution of stress acting on the gripped portion of the test piece TP during the tensile test becomes as shown in the figure, and the distribution of the gripping teeth 20a, 20b When it is located at the lower end (the portion closest to the center P of the test piece and indicated by point A), stress concentration is likely to occur. Further, if the center of the upper and lower grips is shifted, the test piece TP is easily damaged at the point A. Therefore, what should be broken at the central portion of the test piece TP often breaks at the point A (hereinafter, referred to as "chuck breakage"), and there is a problem that an accurate test result cannot be obtained.
本考案の目的は、強度が強くかつ滑り易い試験片のチ
ャック切れを防止したつかみ具備えた材料試験機をを提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a material testing machine provided with a gripper which has high strength and prevents slippage of a slippery test piece.
D.課題を解決するための手段 本考案は、一対のつかみ歯で試験片を把持するつかみ
具を備えた材料試験機に実施される。そしてつかみ歯の
試験片把持面のうち、試験片中心寄りの把持面は波目
状、試験片外寄りの把持面はやすり目状としたことによ
り、引張試験時に試験片の被把持部に使用する試験片中
心側の応力が小さくなるようにして上記問題点を解決す
る。D. Means for Solving the Problems The present invention is implemented in a material testing machine provided with a gripper for gripping a test piece with a pair of gripping teeth. Of the gripping surfaces of the test piece, the gripping surface near the center of the test piece has a wavy shape, and the gripping surface near the outside of the test piece has a file shape, so that it can be used as a gripping part of the test piece during tensile testing. The above problem is solved by reducing the stress on the center side of the test piece.
E.作用 一対のつかみ歯で試験片を把持して引張試験を行う
と、試験片の被把持部に作用する試験片中心側の応力が
小さくなるので、従来のようにつかみ歯端部（第４図の
点Ａ）に応力集中が発生することがない。E. Action When a tensile test is performed by gripping the test piece with a pair of gripping teeth, the stress acting on the gripped portion of the test piece at the center side of the test piece decreases, so that the end of the gripping tooth (No. No stress concentration occurs at point A) in FIG.
F.実施例 第１図および第２図により本考案の一実施例を説明す
る。F. Embodiment One embodiment of the present invention will be described with reference to FIG. 1 and FIG.
第１図（ａ）は本考案に係る材料試験機に用いられる
つかみ具（上部つかみ具）の正面断面図であり、このつ
かみ具は、材料試験機の負荷ロッド（不図示）にユニバ
ーサルジョイントUJを介してそれぞれ連結されるつかみ
具本体１と、この本体１の先端に一対の軸２および押え
ねじ３を介してそれぞれ取付けられた一対の平板状つか
み歯4a,4bとから成る。すなわち、軸２の一端には、つ
かみ歯4a,4bに突設された取付部５が圧入され、ノック
ピン６により固定される。一方、押えねじ３は、本体１
内を螺進，螺退可能とされ、その一端に形成された取付
部3aが軸２の他端に設けられた係合部2aに係合されてい
る。これにより一対の押えねじ３を回転させると一対の
つかみ歯4a,4bが回転することなく互いに開閉して試験
片TP（第２図）の上端を把持する。FIG. 1 (a) is a front sectional view of a grip (upper grip) used in the material testing machine according to the present invention. The grip is attached to a load rod (not shown) of the material testing machine by a universal joint UJ. And a pair of flat gripping teeth 4a and 4b attached to the tip of the main body 1 via a pair of shafts 2 and holding screws 3, respectively. That is, the mounting portion 5 protruding from the gripping teeth 4a, 4b is press-fitted into one end of the shaft 2 and fixed by the knock pin 6. On the other hand, the holding screw 3 is
The inside of the shaft 2 can be advanced and retracted, and an attachment portion 3a formed at one end thereof is engaged with an engagement portion 2a provided at the other end of the shaft 2. Thus, when the pair of holding screws 3 are rotated, the pair of gripping teeth 4a and 4b are opened and closed with each other without rotating, and grip the upper end of the test piece TP (FIG. 2).
また図示はしないが、上記負荷ロッドと同軸で設けら
れた固定ロッド（不図示）には、上部つかみ具と同様の
構成の下部つかみ具が上部つかみ具と対向して連結さ
れ、下部つかみ具の一対のつかみ歯4a,4bに試験片TPの
下端が把持される。Although not shown, a lower rod having a configuration similar to that of the upper grip is connected to a fixed rod (not shown) provided coaxially with the load rod so as to face the upper grip, and a lower grip is provided. The lower end of the test piece TP is gripped by the pair of gripping teeth 4a, 4b.
ここで、第１図（ｂ）に示すように、上部つかみ具１
の各つかみ歯4a,4bの把持面は、上部（負荷ロッド側）
がやすり目状（やすり目部P1）とされ、その下部（下部
つかみ具側）が波目状（波目部P2）とされている。また
下部つかみ具（不図示）の一対のつかみ歯の把持面は、
固定ロッド側が上記やすり目部P1とされ、上部つかみ具
１側が波目部P2とされる。そして第２図に示すように、
両つかみ歯4a,4bを閉じたとき、互いの波目部P2の凹凸
が嵌まり合うようになっている。Here, as shown in FIG. 1 (b), the upper grip 1
The gripping surface of each gripping tooth 4a, 4b is on the upper side (load rod side)
Is formed into a file shape (file portion P1), and the lower part (lower grip side) is formed into a wave shape (wave portion P2). The gripping surfaces of a pair of gripping teeth of a lower gripping tool (not shown)
The fixed rod side is the file part P1, and the upper grip 1 side is the wave part P2. And as shown in FIG.
When the gripping teeth 4a and 4b are closed, the unevenness of the corrugated portion P2 is fitted.
試験片TPの引張試験を行うに当たり、上述の如く構成
された上下つかみ具の各つかみ歯4a,4b間に試験片TPの
両端をそれぞれ挿入し、各押えねじ３を回転させると、
つかみ歯4a,4bが互いに閉じて試験片TPを把持する。こ
のとき、第２図に示すように波目部P2の凹凸が嵌まり合
うように一対のつかみ歯4a,4bが閉じるから、試験片TP
の波目部P2に把持された部分は波目に沿って変形し、こ
れにより試験片TPの把持面への接触面積はやすり目部P1
より大きくなる。その結果、引張荷重作用時に試験片TP
の被把持部に作用する応力の分布は第２図の如くなり、
つかみ歯4a,4bの下端側、すなわち試験片中心Ｐ側に至
るほど試験片TPの被把持部に作用する応力が小さくな
る。また下部つかみ具（不図示）においても、試験片TP
の被把持部における応力分布は、つかみ歯上端側（試験
片中心Ｐ側）に至るほど小さくなる。In performing the tensile test of the test piece TP, insert both ends of the test piece TP between the gripping teeth 4a and 4b of the upper and lower gripping tools configured as described above, and rotate each holding screw 3,
The gripping teeth 4a, 4b close each other and grip the test piece TP. At this time, as shown in FIG. 2, the pair of gripping teeth 4a and 4b are closed so that the unevenness of the wave portion P2 is fitted, so that the test piece TP
The portion gripped by the wavy part P2 is deformed along the wavy part, whereby the contact area of the test piece TP with the gripping surface is reduced by the file part P1.
Be larger. As a result, the test piece TP
The distribution of the stresses acting on the gripped part of is as shown in FIG.
The stress acting on the gripped portion of the test piece TP decreases toward the lower end of the gripping teeth 4a, 4b, that is, toward the test piece center P. The test piece TP is also used for the lower grip (not shown).
The stress distribution in the gripped portion becomes smaller toward the upper end side of the gripping tooth (the center P side of the test piece).
したがって、従来のようにつかみ歯の試験片中心Ｐ側
端部に応力集中が発生することがなく、この部分で試験
片TPが破断（チャック切れ）するのが防止され、試験片
中心付近で試験片TPが破断し正確な試験結果を得ること
が可能となる。Therefore, stress concentration does not occur at the end P side of the test piece center of the gripping tooth as in the conventional case, and the test piece TP is prevented from breaking (cutting the chuck) at this portion, and the test is performed near the test piece center. The piece TP breaks, and an accurate test result can be obtained.
なお、つかみ刃の開閉方式は上述のものに限定され
ず、例えば油圧式や空圧式でもよい。In addition, the opening / closing method of the gripping blade is not limited to the above-described one, and may be, for example, a hydraulic type or a pneumatic type.
G.考案の効果 本考案は以上のように構成したから、つかみ歯の試験
片中心側端部において試験片に応力集中が発生せず、チ
ャック切れが防止され、常に正確な試験結果を得ること
が可能となる。G. Effect of the Invention Since the present invention is configured as described above, stress concentration does not occur on the test piece at the center end of the test piece of the gripping tooth, the chuck is prevented from being cut, and accurate test results can always be obtained. Becomes possible.
第１図および第２図は本考案の一実施例を示し、第１図
（ａ）が本考案に係るつかみ具の全体構成を示す正面断
面図、第１図（ｂ）がつかみ歯の把持面を示す斜視図、
第２図はつかみ歯の各部分における応力分布を示す図で
ある。 第４図は従来のつかみ歯とその応力分布を示す図であ
る。 1:つかみ具 4a,4b,10a,10b:つかみ歯 P:試験片中心、P1:やすり目部 P2:波目部、TP:試験片1 and 2 show an embodiment of the present invention. FIG. 1 (a) is a front sectional view showing the entire configuration of a gripper according to the present invention, and FIG. Perspective view showing the surface,
FIG. 2 is a view showing a stress distribution in each part of the grip teeth. FIG. 4 is a diagram showing a conventional gripping tooth and its stress distribution. 1: Gripping tools 4a, 4b, 10a, 10b: Gripping teeth P: Center of test piece, P1: File part P2: Rip, TP: Test piece
Claims (1)
具を備えた材料試験機において、つかみ歯の試験片把持
面のうち、試験片中心寄りの把持面は波目状、試験片外
寄りの把持面はやすり目状としたことを特徴とする材料
試験機。In a material testing machine provided with a gripper for gripping a test piece with a pair of gripping teeth, of the gripping surfaces of the gripping test piece, the gripping surface near the center of the test piece is wavy, and the gripping surface is outside the test piece. A material testing machine, characterized in that the gripping surface closer has a file shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990053170U JP2522822Y2 (en) | 1990-05-22 | 1990-05-22 | Material testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990053170U JP2522822Y2 (en) | 1990-05-22 | 1990-05-22 | Material testing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0411454U JPH0411454U (en) | 1992-01-30 |
| JP2522822Y2 true JP2522822Y2 (en) | 1997-01-16 |
Family
ID=31574128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990053170U Expired - Fee Related JP2522822Y2 (en) | 1990-05-22 | 1990-05-22 | Material testing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2522822Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2927997A1 (en) * | 2008-02-25 | 2009-08-28 | Snecma Sa | METHOD FOR TESTING A WAVE FOOT COATING |
| FR2927998A1 (en) * | 2008-02-25 | 2009-08-28 | Snecma Sa | TESTING MACHINE FOR A WAVE FOOT COATING. |
| JP5202998B2 (en) * | 2008-03-10 | 2013-06-05 | 高周波熱錬株式会社 | Chuck device, tensile test device, and manufacturing method of chuck device |
| CN103954483B (en) * | 2014-03-18 | 2016-12-07 | 西安交通大学 | Super-high strength steel tabular fatigue testing specimen, retaining part processing method and high-cycle fatigue test method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0621003Y2 (en) * | 1987-09-17 | 1994-06-01 | 株式会社東衡テスタック | Test piece chuck device |
-
1990
- 1990-05-22 JP JP1990053170U patent/JP2522822Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0411454U (en) | 1992-01-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |