JPS648777B2 - - Google Patents
Info
- Publication number
- JPS648777B2 JPS648777B2 JP20254181A JP20254181A JPS648777B2 JP S648777 B2 JPS648777 B2 JP S648777B2 JP 20254181 A JP20254181 A JP 20254181A JP 20254181 A JP20254181 A JP 20254181A JP S648777 B2 JPS648777 B2 JP S648777B2
- Authority
- JP
- Japan
- Prior art keywords
- groove
- spring
- connection terminal
- displacement
- groove connection
- 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
Links
- 238000006073 displacement reaction Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0057—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to spring-shaped elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電子装置等の電線接続に使用されるＵ
溝接続端子のばね特性（荷重変位特性）を測定す
る方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to
This invention relates to a method of measuring spring characteristics (load displacement characteristics) of a groove connection terminal.
（従来の技術）
従来のＵ溝接続端子ばね特性測定方法を第２図
に示す。第２図において、２０１は一般の引張圧
縮試験器のクロスヘツド、２０２は前記クロスヘ
ツドに固定されたフツク、２０３は試料固定用治
具であり固定部２０３ａでＵ溝接続端子の根元部
を固定している。２０４はＵ溝接続端子であり測
定の為、片側ばねは切断除去している。ばね特性
方法としては、試料固定治具２０３でＵ溝接続端
子２０４を固定し上方からフツク２０２で加圧
し、荷重(F)のときの変位量（δ）をXYレコーダ
の記録紙に記録されたクロスヘツド２０１の移動
により読み取る。Ｕ溝接続端子のＵ溝ばねのスチ
フネス（剛性）（St）は式(1)により計算される。(Prior Art) A conventional method for measuring spring characteristics of a U-groove connection terminal is shown in FIG. In Fig. 2, 201 is a crosshead of a general tensile compression tester, 202 is a hook fixed to the crosshead, and 203 is a sample fixing jig, which fixes the base of the U-groove connection terminal with a fixing part 203a. There is. 204 is a U-groove connection terminal, and the spring on one side is cut and removed for measurement. As a spring characteristic method, the U-groove connection terminal 204 is fixed with a sample fixing jig 203, pressurized from above with the hook 202, and the amount of displacement (δ) when the load (F) is applied is recorded on the recording paper of an XY recorder. Reading is performed by moving the crosshead 201. The stiffness (rigidity) (St) of the U-groove spring of the U-groove connection terminal is calculated using equation (1).
St＝Ｆ／δ ………(1)
次にＵ溝接続端子の接続機能について、説明図
第３図ａ，ｂにより説明する。第３図ａで２０４
はＵ溝接続端子、２０４ａは当該Ｕ溝接続端子の
根元部、２０４ｂはＵ溝ばね部であり対をなしＵ
溝を形成している。２０５は絶縁被覆電線、２０
５ａは一般に軟銅線でできた導体部、２０５ｂは
合成樹脂、紙等よりなる絶縁被覆部である。電線
２０５がＵ溝接続端子２０４のＵ溝ばね部２０４
ｂに圧入されることにより、Ｕ溝ばね部２０４ｂ
の剛性（スチフネス）により絶縁被覆２０５ｂが
除去され、導体部２０５ａはＵ溝ばね部２０４ｂ
と電気的に接続する。このとき、導体部２０５ａ
は図の如く塑性変形を受けるとともに、Ｕ溝ばね
部２０４ｂもたわみ、このたわみ量（変位量）に
応じた接触力(F)が発生することにより半永久的な
接続の安定性を得る。 St=F/δ (1) Next, the connection function of the U-groove connection terminal will be explained with reference to explanatory diagrams 3a and 3b. 204 in Figure 3a
is a U-groove connection terminal, 204a is a base portion of the U-groove connection terminal, and 204b is a U-groove spring portion, forming a pair U
forming a groove. 205 is an insulated wire, 20
5a is a conductor section generally made of annealed copper wire, and 205b is an insulating covering section made of synthetic resin, paper, or the like. The electric wire 205 connects to the U-groove spring portion 204 of the U-groove connection terminal 204
By being press-fitted into the U-groove spring portion 204b
The insulation coating 205b is removed due to the stiffness of the U-groove spring portion 204b.
electrically connect with. At this time, the conductor portion 205a
undergoes plastic deformation as shown in the figure, and the U-groove spring portion 204b also deflects, and a contact force (F) corresponding to the amount of deflection (displacement) is generated, thereby providing semi-permanent connection stability.
従つて以上説明した如くの機能を有する為に、
Ｕ溝ばねの剛性（スチフネス）は一般のコネクタ
ばねの剛性に比べ格段高いことが要求される。い
いかえると非常に小さな変位量（たわみ）により
大きな接触力(F)を発生させるばねであることが要
求される。 Therefore, in order to have the functions as explained above,
The stiffness of the U-groove spring is required to be much higher than that of a general connector spring. In other words, the spring is required to generate a large contact force (F) with a very small amount of displacement (deflection).
（発明が解決しようとする問題点）
第３図ｂにこのようなＵ溝ばねの接続時のモデ
ルを示す。Ｕ溝ばねは接触力(F)により左右均等に
押し広げられるので根元部２０４ａの中心部を固
定（ハツチングで示す）して片側のＵ溝ばね部２
０４ｂが変位している状態を考えればよい。ここ
で第２図の固定部２０３ａを考えると、まず荷重
(F)を受けた場合Ｕ溝接続端子２０４が固定部が回
転してはならないため、非常に強い力で固定する
必要があり、その為固定部によりＵ溝接続端子の
根元部は塑性変形を受ける。従つて第３図ｂの様
な理想的固定状態となる様に固定部２０３ａを設
計する事は不可能に近い。(Problems to be Solved by the Invention) FIG. 3b shows a model when such a U-groove spring is connected. Since the U-groove spring is pushed apart evenly on the left and right sides by the contact force (F), the center part of the root part 204a is fixed (indicated by hatching) and the U-groove spring part 2 on one side is fixed.
04b is displaced. When considering the fixed part 203a in Fig. 2, first, the load
(F), the fixing part of the U-groove connection terminal 204 must not rotate, so it is necessary to fix it with very strong force. Therefore, the base of the U-groove connection terminal does not undergo plastic deformation due to the fixation part. receive. Therefore, it is almost impossible to design the fixing portion 203a so as to achieve the ideal fixing state as shown in FIG. 3b.
次にＵ溝ばねの変位量（δ）の測定について述
べると、クロスヘツドの移動量からＵ溝ばねの変
位量を間接的に読み取る為、測定系自体の変位量
（δi）や、フツク２０２がＵ溝接続端子２０４の
加圧部に食い込むことによる変位量（δc）等がＵ
溝ばねの変位量（δ）中に含まれる。よつて、Ｕ
溝ばねに荷重(F)が加わつた時の真の変位量（δt）
は式(2)で表わせる。 Next, regarding the measurement of the displacement amount (δ) of the U-groove spring, since the displacement amount of the U-groove spring is indirectly read from the movement amount of the crosshead, the displacement amount (δ i ) of the measurement system itself and the hook 202 are measured. The amount of displacement (δ c ) caused by the U-groove connection terminal 204 biting into the pressurized part, etc.
Included in the displacement amount (δ) of the groove spring. By the way, U
True displacement (δ t ) when load (F) is applied to the groove spring
can be expressed by equation (2).
δt−δ−δi−δc ………(2)
ここで変位量（δ）に対し変位量（δi）（δc）が
十分小さい場合は測定誤差は多くないが、前述の
如くＵ溝ばねのスチフネス（剛性）は非常に高い
為、変位量（δ）は小さく、変位量（δi）（δc）は
無視できない。また場合によつては変位量（δ）
よりも変位量（δi）（δc）が大きくなることがあ
る。 δ t −δ−δ i −δ c ………(2) Here, if the displacement (δ i ) (δ c ) is sufficiently small compared to the displacement (δ), there will not be much measurement error, but as mentioned above, Since the stiffness (rigidity) of the U-groove spring is very high, the amount of displacement (δ) is small, and the amounts of displacement (δ i ) (δ c ) cannot be ignored. In some cases, the amount of displacement (δ)
The amount of displacement (δ i ) (δ c ) may be larger than that.
従つて、従来の方法でＵ溝ばねのスチフネスを
測定した場合、非常に測定のばらつきが大きく実
用に値する測定値を得ることは難しかつた。 Therefore, when the stiffness of a U-groove spring is measured using the conventional method, the measurement variation is extremely large, and it is difficult to obtain a practically useful measurement value.
（問題点を解決するための手段）
本発明は、この様な問題点が生ずる高スチフネ
スのＵ溝接続端子のばね特性を測定するために、
Ｕ溝接続端子を軽く固定し、ばね部を縮める方向
に向けて加圧し、この状態でＵ溝幅を測定し、あ
らかじめ測定しておいた非加圧状態のＵ溝幅との
差により得たばねの変位量を用いてばね特性を算
出するものである。(Means for solving the problem) The present invention provides a method for measuring the spring characteristics of a high stiffness U-groove connection terminal that causes such problems.
Lightly fix the U-groove connection terminal, apply pressure in the direction of compressing the spring part, measure the U-groove width in this state, and find the spring obtained by the difference from the pre-measured U-groove width in the non-pressurized state. The spring characteristics are calculated using the amount of displacement.
（作用）
本発明は、Ｕ溝幅を直接的に測定することによ
り、Ｕ溝接続端子を加圧する加圧装置の変位量
や、Ｕ溝接続端子の塑性変形の影響を受けること
なく、Ｕ溝接続端子のばね部が加圧により変位し
た量を得ることができるのである。(Function) By directly measuring the U-groove width, the present invention can measure the width of the U-groove without being influenced by the amount of displacement of the pressurizing device that pressurizes the U-groove connection terminal or by the plastic deformation of the U-groove connection terminal. The amount by which the spring portion of the connection terminal is displaced by applying pressure can be obtained.
（実施例）
第１図は本発明の一実施例を説明するための図
であり、本発明を実施するための装置構成例であ
る。(Embodiment) FIG. 1 is a diagram for explaining an embodiment of the present invention, and is an example of an apparatus configuration for implementing the present invention.
図において、１０６は基台、１０７は前記基台
１０６の中央部に設置されXY方向に移動可能な
XYテーブル、１０８はXYテーブル１０７上に
設置されＸ方向に微動調整可能なＸ方向テーブル
であり試料保持ばね１０８ａがねじ等で取り付け
られており、Ｕ溝接続端子２０４の両面をＺ方向
（この装置例の上下方向）から軽く押えている。
１０９は固定フツクであり、XYテーブル１０７
に固定されている。１１０は可動フツク、１１１
は歪計、１１２は微動送り機構部、１１３は回転
レバーである。可動フツク１１０と歪計１１１と
微動送り機構部１１２と回転レバー１１３はＹ方
向に連結され支持部１１４によつてＹ方向のみ自
由な状態で基台６に取り付けられているため、回
転レバー１１３を回転させることにより、微動送
り機構部１１２でＹ方向の運動に減速され、可動
フツク１１０によりＵ溝接続端子のばね部を固定
フツク１０９と反対方向から加圧することができ
る。１１５は光学的測定装置であり、基台１０６
に設けられた支柱（図示しない）に顕微鏡を配置
し接眼部にデジタル測微装置を取り付けたもので
あり、Ｕ溝接続端子２０４の変位状態をＺ方向
（上方向）から測定することができる。 In the figure, 106 is a base, and 107 is installed in the center of the base 106 and is movable in the X and Y directions.
The XY table 108 is an X-direction table that is installed on the XY table 107 and can be finely adjusted in the X direction.A sample holding spring 108a is attached with screws, etc. Press down lightly from the top and bottom directions (in the example above).
109 is a fixed hook, and XY table 107
is fixed. 110 is a movable hook, 111
1 is a strain gauge, 112 is a fine movement feed mechanism, and 113 is a rotation lever. The movable hook 110, the strain gauge 111, the fine movement feed mechanism section 112, and the rotary lever 113 are connected in the Y direction and are attached to the base 6 by the support section 114 with freedom only in the Y direction. By rotating, the movement is decelerated in the Y direction by the fine movement feed mechanism section 112, and the movable hook 110 can press the spring section of the U-groove connection terminal from the opposite direction to the fixed hook 109. 115 is an optical measuring device, and a base 106
A microscope is placed on a support (not shown) provided at the top, and a digital micrometer is attached to the eyepiece, and the displacement state of the U-groove connection terminal 204 can be measured from the Z direction (above). .
この様な装置を用いてＵ溝接続端子ばね特性を
測定するためには、Ｕ溝接続端子２０４の両面を
試料保持ばね１０８ａによつて軽く押さえ、回転
レバー１１３を回転させて可動フツク１１０によ
り、Ｕ溝接続端子２０４の他方のばね部を固定フ
ツク１０９と反対方向から加圧し縮める。この状
態で可動フツク１１０に加わつた荷重値を歪計１
１１により検出し、デジタルボルトメータ等の装
置１１１ａで検出された荷重値を読む。この加圧
時の状態のまま加圧時のＵ溝幅（Si）を、光学測
定装置１１５に配置された顕微鏡の接眼部に取り
付けられたデジタル測微装置を用いてＺ方向（上
方向）から直接測定する。尚、同様にして、初期
の、すなわちＵ溝接続端子２０４が非加圧状態の
Ｕ溝幅（So）も直接測定しておく。 In order to measure the spring characteristics of the U-groove connection terminal using such a device, both sides of the U-groove connection terminal 204 are lightly held down by the sample holding spring 108a, the rotary lever 113 is rotated, and the movable hook 110 is used to The other spring portion of the U-groove connection terminal 204 is compressed by applying pressure from the opposite direction to the fixing hook 109. In this state, the strain meter 1 calculates the load value applied to the movable hook 110.
11, and the load value detected by a device 111a such as a digital voltmeter is read. In this pressurized state, the U groove width (Si) at the time of pressurization was measured in the Z direction (upward direction) using a digital micrometer attached to the eyepiece of the microscope placed in the optical measurement device 115. Measure directly from In addition, in the same way, the initial U-groove width (So), that is, when the U-groove connection terminal 204 is in a non-pressurized state, is also directly measured.
この様にして直接測定された加圧時のＵ溝幅
（Si）と初期のＵ溝幅（So）を用いて、Ｕ溝ばね
のスチフネス（剛性）は式(3)によつて求めること
ができる。 Using the U-groove width (Si) during pressurization and the initial U-groove width (So) that were directly measured in this way, the stiffness of the U-groove spring can be calculated using equation (3). can.
St＝2F／（So−Si） ………(3) ここでStはスチフネス、Ｆは荷重値である。 St=2F/(So−Si) ………(3) Here, St is stiffness and F is load value.
（発明の効果）
以上説明した様に、本発明の測定方法によれ
ば、高スチフネスのため変位量が少なく、かつ、
測定の際の塑性変形や測定系自体の変位量の影響
を受けやすいＵ溝接続端子のばね特性を測定する
に際し、加圧は外側から行ない、その変位量をＵ
溝幅から直接測定するため、塑性変形の場所と変
位量を測定する場所が異なることとなり、測定誤
差が少なくなる。(Effects of the Invention) As explained above, according to the measurement method of the present invention, the amount of displacement is small due to high stiffness, and
When measuring the spring characteristics of a U-groove connection terminal that is susceptible to plastic deformation during measurement and displacement of the measurement system itself, pressure is applied from the outside and the displacement is
Since the groove width is directly measured, the location of plastic deformation and the location where the amount of displacement is measured are different, reducing measurement errors.
これを第４図を用いて説明する。第４図は測定
したスチフネスの値と理論値の比較図であり、ａ
は従来方法、ｂは本発明方法を示す。図におい
て、縦軸はスチフネスの値を表わし、横軸は変位
量を表わす。ａに示す様に、従来の測定方法では
スチフネスが40Kg／mm程度を越えるに従がつて理
論値との差が大きくなつていくが、ｂに示す様に
本発明方法によれば、スチフネスが40Kg／mmを大
きく越えても理論値とほぼ一致した測定結果が得
られる。 This will be explained using FIG. 4. Figure 4 is a comparison diagram between the measured stiffness value and the theoretical value, and a
b indicates the conventional method, and b indicates the method of the present invention. In the figure, the vertical axis represents the stiffness value, and the horizontal axis represents the amount of displacement. As shown in a, with the conventional measurement method, as the stiffness exceeds about 40 kg/mm, the difference from the theoretical value increases, but as shown in b, according to the method of the present invention, the stiffness increases to 40 kg/mm. Even if the value greatly exceeds /mm, measurement results that nearly match the theoretical values can be obtained.
この様に、本発明によれば、高スチフネスのば
ね特性測定において、誤差の少ない測定結果が得
られる。 As described above, according to the present invention, measurement results with few errors can be obtained in measuring spring characteristics of high stiffness.
第１図は本発明のばね特性測定方法を説明する
ための使用装置図、第２図は従来のばね特性試験
方法の説明図、第３図ａ，ｂはＵ溝接続端子の接
続状態の説明図、第４図は測定したスチフネスと
理論値との比較の図で、ａは従来方法によりスチ
フネスの値を求めた図であり、ｂは本発明方法に
よりスチフネスの値を求めた図である。
１０６……基台、１０７……XYテーブル、１
０８……Ｘ方向テーブル、１０８ａ……試料保持
ばね、１０９……固定フツク、１１０……可動フ
ツク、１１１……歪計、１１２……微動送り機構
部、１１３……回転レバー、１１４……支持部、
１１５……光学測定装置、２０４……Ｕ溝接続端
子。
Fig. 1 is a diagram of the equipment used to explain the spring characteristic measuring method of the present invention, Fig. 2 is an explanatory diagram of the conventional spring characteristic testing method, and Fig. 3 a and b are explanations of the connection state of the U-groove connection terminal. Figure 4 shows a comparison between the measured stiffness and the theoretical value, where a is a diagram where the stiffness value was determined by the conventional method, and b is a diagram where the stiffness value was determined by the method of the present invention. 106... Base, 107... XY table, 1
08...X-direction table, 108a...sample holding spring, 109...fixed hook, 110...movable hook, 111...strain meter, 112...fine feed mechanism section, 113...rotary lever, 114...support Department,
115...Optical measurement device, 204...U groove connection terminal.
Claims (1)
ステツプと、 該Ｕ溝接続端子のばね部のＵ溝幅を非加圧状態
で光学測定装置を用いて測定するステツプと、 該Ｕ溝端子のばね部を外側から縮める方向に向
けて所定の圧力で加圧し、該加圧状態のＵ溝幅を
前記光学測定装置を用いて測定するステツプと、 前記非加圧状態と加圧状態におけるＵ溝幅の差
により得たばねの変位量でばね特性を算出するス
テツプを有するＵ溝接続端子のばね特性測定方
法。[Claims] 1. A step of lightly fixing the U-groove connection terminal with a holding spring, and a step of measuring the U-groove width of the spring portion of the U-groove connection terminal using an optical measuring device in a non-pressurized state. a step of pressurizing the spring portion of the U-groove terminal from the outside in a direction to contract it with a predetermined pressure, and measuring the U-groove width in the pressurized state using the optical measuring device; A method for measuring spring characteristics of a U-groove connection terminal, comprising a step of calculating spring characteristics from the amount of spring displacement obtained from the difference in U-groove width in a pressure state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20254181A JPS58105035A (en) | 1981-12-17 | 1981-12-17 | Measuring device for spring property of connecting terminal having u-shaped cut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20254181A JPS58105035A (en) | 1981-12-17 | 1981-12-17 | Measuring device for spring property of connecting terminal having u-shaped cut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58105035A JPS58105035A (en) | 1983-06-22 |
| JPS648777B2 true JPS648777B2 (en) | 1989-02-15 |
Family
ID=16459205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20254181A Granted JPS58105035A (en) | 1981-12-17 | 1981-12-17 | Measuring device for spring property of connecting terminal having u-shaped cut |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58105035A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781406A (en) * | 2019-01-30 | 2019-05-21 | 江苏兰菱机电科技有限公司 | Apply the high-precision speed reducer testboard of u-shaped integral support |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5013684U (en) * | 1973-06-01 | 1975-02-13 |
-
1981
- 1981-12-17 JP JP20254181A patent/JPS58105035A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58105035A (en) | 1983-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2686663B2 (en) | Terminal crimp height measuring method and device | |
| US5966011A (en) | Apparatus for measuring bulk materials and surface conditions for flat and curved parts | |
| US7418858B2 (en) | Method and system for ripple-spring compression assessment | |
| JP3233428B2 (en) | Terminal crimping device | |
| US6508132B1 (en) | Dynamic load cell apparatus | |
| US3977231A (en) | Static coefficient test method and apparatus | |
| JPS648777B2 (en) | ||
| US5483836A (en) | Device for measuring lateral deformations in material test specimens | |
| CN217425653U (en) | Hall effect measures with sample platform of taking probe | |
| JP2000046870A (en) | Terminal-connecting apparatus | |
| JP3324741B2 (en) | Device and method for measuring displacement of elastic contact piece of terminal | |
| CN107045084B (en) | Tangential piezoelectric constant d 15 Measuring device and method of (a) | |
| SU1723679A1 (en) | Method nondestructive testing of connections of electric circuits of printed circuit boards | |
| US4279164A (en) | Metallurgical specimen tester | |
| SU1179464A1 (en) | Transducer for measuring brush pressure on collector of electric machine | |
| JPS59632Y2 (en) | Circuit element holding device | |
| JP2887195B2 (en) | measuring device | |
| RU2095772C1 (en) | Pressure transducer and process of its manufacture | |
| CN213122172U (en) | Experimental device and system for measuring breakdown strength of insulation interface | |
| CN215065752U (en) | Miniature tension testing device | |
| JP2941720B2 (en) | Method and apparatus for measuring parallelism in mounting end plugs of nuclear fuel rods | |
| SU1025999A1 (en) | Strain gauge pickup | |
| SU1657945A1 (en) | Method of testing of quality of cementing of resistance strain gauges on to metal surface | |
| EP1288646A2 (en) | Method and apparatus for measuring a material property | |
| JPH0329732Y2 (en) |