JP5786698B2 - Strain measuring instrument - Google Patents

Strain measuring instrument Download PDF

Info

Publication number
JP5786698B2
JP5786698B2 JP2011273311A JP2011273311A JP5786698B2 JP 5786698 B2 JP5786698 B2 JP 5786698B2 JP 2011273311 A JP2011273311 A JP 2011273311A JP 2011273311 A JP2011273311 A JP 2011273311A JP 5786698 B2 JP5786698 B2 JP 5786698B2
Authority
JP
Japan
Prior art keywords
spring
strain gauge
strain
plunger
measuring instrument
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
Application number
JP2011273311A
Other languages
Japanese (ja)
Other versions
JP2013124910A (en
Inventor
亘 前田
亘 前田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2011273311A priority Critical patent/JP5786698B2/en
Publication of JP2013124910A publication Critical patent/JP2013124910A/en
Application granted granted Critical
Publication of JP5786698B2 publication Critical patent/JP5786698B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Description

本発明は歪み測定器に関し、詳しくは鋼材等の材料の応力-歪曲線或いは残留応力を求める際の歪み測定が簡便に行える歪み測定器に関する。   The present invention relates to a strain measuring instrument, and more particularly to a strain measuring instrument that can easily perform strain measurement when obtaining a stress-strain curve or residual stress of a material such as steel.

特許文献１に記載されるように、歪みゲージは広範囲の分野で用いられる基本的な測定器である。歪みゲージはさまざまな物体の表面に接着された状態で用いられる。尚、特許文献１では、接着部そのものの温度を適切に制御するために、従来の加熱ランプによる接着剤の硬化方法に代わるものとして、ヒータと温度制御具を一体化してなる歪みゲージ押さえ具を、物体表面上の歪みゲージ直上に配置し、その上から歪みゲージ接合用クランプで押さえながら加熱して接着剤を硬化させる方法を提案している。   As described in Patent Document 1, a strain gauge is a basic measuring instrument used in a wide range of fields. Strain gauges are used while being adhered to the surface of various objects. In Patent Document 1, in order to appropriately control the temperature of the bonded portion itself, as an alternative to the conventional method of curing the adhesive with a heating lamp, a strain gauge pressing tool formed by integrating a heater and a temperature control tool is used. A method is proposed in which the adhesive is cured by placing it directly above the strain gauge on the surface of the object and heating it while holding it with a clamp for strain gauge bonding.

特開２０００−３４６７２４号公報JP 2000-346724 A

背景技術では、歪みゲージを測定対象箇所の表面に接着剤で接着（貼付）する必要がある。そのため、測定対象箇所の表面に塗装や錆がある場合、それらは接着不良の原因となるので、それらを除去し、その後、磨き、脱脂し、更には罫書きするなど、沢山の準備作業が必要であり、設置までに時間がかかっていた。
又、隅肉溶接のホットスポット部の応力測定の際は、溶接線や母材の近傍に歪みゲージを接着する必要があるため、作業性が悪かった。 In the background art, it is necessary to bond (paste) the strain gauge to the surface of the measurement target portion with an adhesive. For this reason, if there is paint or rust on the surface of the measurement object, they can cause poor adhesion, so they need to be removed, then polished, degreased, and even marked. And it took time to install.
In addition, when measuring the stress at the hot spot portion of fillet welding, the workability is poor because it is necessary to bond a strain gauge near the weld line or the base material.

本発明は、背景技術が抱えていた、歪みゲージ接着のため測定対象箇所の表面の塗装や錆の除去、磨きや脱脂及び罫書き等の前処理作業に時間がかかるという課題、並びに隅肉溶接のホットスポット部応力測定における歪みゲージ貼付作業の作業性が悪いという課題を解決し、前記前処理作業の簡略化乃至省略を可能とし、且つ、隅肉溶接のホットスポット部応力測定における歪みゲージ設置作業の作業性を向上させうる歪み測定器を提供することを目的とする。   The present invention has a problem in that it takes time for pre-treatment work such as painting of the surface of a measurement target, removal of rust, polishing, degreasing, and scoring because of strain gauge adhesion, as well as fillet welding. This solves the problem that the workability of the strain gauge attaching work in hot spot stress measurement is poor, makes it possible to simplify or omit the pretreatment work, and install the strain gauge in hot spot stress measurement of fillet welding An object of the present invention is to provide a strain measuring instrument capable of improving workability.

発明者らは、上記課題を解決するために鋭意検討し、歪みゲージを測定対象箇所表面に設置する手段として、接着剤で接着するのではなく、磁力とばね力により圧着し、そのまま歪み測定を行うことができる歪み測定器を開発し、本発明とした。
すなわち、本発明は、以下のとおりである。
（１） ブラケットの長さ方向の一端部に測定対象物に固定するためのマグネットを、他端部に歪みゲージ押さえ部を有する歪み測定器であって、前記歪みゲージ押さえ部は、同心円柱状に配置した２つの弦巻ばねの各ばね力を調整可能とし、該ばね力により歪みゲージを測定対象箇所表面に押付け可能に保持する構造を有することを特徴とする歪み測定器。
（２） 前記同心円柱状に配置した２つの弦巻ばねは、内側弦巻ばねのばね定数が外側弦巻ばねのバネ定数の２〜１０倍であることを特徴とする（１）に記載の歪み測定器。 The inventors have intensively studied to solve the above problems, and as a means of installing a strain gauge on the surface of the measurement target location, rather than bonding with an adhesive, pressure bonding is performed by magnetic force and spring force, and strain measurement is performed as it is. A strain measuring instrument that can be used has been developed and used in the present invention.
That is, the present invention is as follows.
A magnet for fixing the object to be measured lengthwise end portions of the (1) bracket, a strain measuring device having a strain gauge pressing portion at the other end, the strain gauge pressing portion is concentrically columnar A strain measuring instrument characterized by having a structure in which each spring force of two arranged string-wound springs can be adjusted, and the strain gauge is held so as to be pressed against the surface of the measurement object by the spring force.
(2) The strain measuring instrument according to (1), wherein the two string-wound springs arranged in the concentric columnar shape have a spring constant of the inner string-wound spring that is 2 to 10 times the spring constant of the outer string-wound spring.

本発明によれば、歪みゲージを磁力とばね力により圧着し、そのまま応力測定を行うことができるから、従来、歪みゲージ貼付作業時に必ず発生していた前処理、即ち測定対象箇所表面の塗装や錆の除去、接着性向上のための磨きや罫書きといった前処理を行わなくてもよくなり、又、磁力源であるマグネットとばね力による歪みゲージ押さえ部とをブラケットで連結したから、マグネットを固定できないような狭い測定対象箇所である隅肉溶接部のホットスポット部に対しても該ホットスポット部から離れた位置に固定したマグネットからブラケットを介して歪みゲージを押付けることができ、厄介な歪みゲージ貼付作業を行う従来よりも格段に作業性が向上して工数削減に寄与する。   According to the present invention, the strain gauge can be pressure-bonded by a magnetic force and a spring force, and the stress measurement can be performed as it is. It is not necessary to perform pre-treatment such as polishing and scoring to remove rust and improve adhesion, and the magnet that is a magnetic force source and the strain gauge holding part by spring force are connected by a bracket, so the magnet The strain gauge can be pressed through the bracket from the magnet fixed at a position distant from the hot spot part to the hot spot part of the fillet weld part, which is a narrow measurement target location that cannot be fixed. Workability is significantly improved compared to conventional strain gage application work, which contributes to man-hour reduction.

本発明の歪み測定器の１例を示す、（ａ）は平面図、（ｂ）は一部透視側面図、（ｃ）は正面図、（ｄ）はスプリングプランジャー構造を示す一部透視側面断面図。1 shows an example of a strain measuring instrument of the present invention, (a) is a plan view, (b) is a partially transparent side view, (c) is a front view, and (d) is a partially transparent side view showing a spring plunger structure. Sectional drawing. 本発明の歪み測定器を隅肉溶接のホットスポット部へ設置した例を示す一部透視側面図。The partial see-through | perspective side view which shows the example which installed the distortion measuring device of this invention in the hot spot part of fillet welding.

本発明では、ブラケットの長さ方向の一端部にマグネット、他端部に歪みゲージ押さえ部を設けた。この歪ゲージ押さえ部は、同心円柱状に配置した２つの弦巻ばねの各ばね力を調整可能とし、該ばね力により歪みゲージを測定対象箇所表面に押付け可能に保持する構造を有する。
その具体例を図１に示す。図１において、ブラケット１の長さ方向の一端部の下面側にはマグネット８がマグネット締結ボルト１３で締結されている。一方、ブラケット１の長さ方向の他端部の下面側には、歪みゲージ押さえ部１００として、同心円柱状に配置した２つの弦巻ばね（内側弦巻ばね１０及び外側弦巻ばね６）の各ばね力を調整可能とし、該ばね力により歪みゲージ３を測定対象箇所表面に押付け可能に保持する構造を有するものが取付けられている。尚、図１（ａ）（ｂ）（ｃ）は縮尺が同一且つ等方的であり、図１中の記号Ｌは、マグネット８と歪みゲージ押さえ部１００との中心線間距離である。 In the present invention, a magnet is provided at one end portion in the length direction of the bracket, and a strain gauge pressing portion is provided at the other end portion. This strain gauge pressing portion has a structure in which each spring force of two chord springs arranged in a concentric columnar shape can be adjusted, and the strain gauge is held to be pressed against the surface of the measurement target by the spring force.
A specific example is shown in FIG. In FIG. 1, a magnet 8 is fastened with a magnet fastening bolt 13 on the lower surface side of one end portion in the length direction of the bracket 1. On the other hand, on the lower surface side of the other end portion in the length direction of the bracket 1, the spring force of two string-wound springs (the inner string-wound spring 10 and the outer string-wound spring 6) arranged in a concentric column shape as the strain gauge pressing portion 100. A device having a structure that can be adjusted and holds the strain gauge 3 so as to be pressed against the measurement target surface by the spring force is attached. 1A, 1B, and 1C are the same and isometric in scale, and the symbol L in FIG. 1 is the distance between the center lines of the magnet 8 and the strain gauge pressing portion 100.

２つの弦巻ばねを同心円柱状に配置したのは、歪みゲージをより均等に押付けるため、及び、よりコンパクトな構造とするためである。又、マグネットと歪みゲージ押さえ部とを分離してブラケットで連結したのは、歪みゲージは入るがマグネットは入らないような狭い場所（例えば隅肉溶接のホットスポット部）が測定対象箇所になる場合でも、離れた箇所から測定対象箇所に歪みゲージを押付けることができるようにするためである。   The reason why the two coil springs are arranged in a concentric cylindrical shape is to press the strain gauge more evenly and to make the structure more compact. Also, the magnet and the strain gauge holding part are separated and connected by a bracket when the measurement target is a narrow place where the strain gauge enters but the magnet does not enter (for example, fillet weld hot spot). However, this is because the strain gauge can be pressed from a remote location to the measurement target location.

歪みゲージ押さえ部１００の構造について、より詳細に述べる。
歪みゲージ３は、中空で断面が矩形状の歪みゲージホルダ２の先端部（図からは下端部であるともいえるが、押付け方向の先端側になるため便宜上先端部と称する）外面側に着脱可能に装着されている。
内側弦巻ばね（プランジャー内スプリング）１０は、スプリングプランジャー４のプランジャー本体ケース９に内蔵され、プランジャー先端部１１にばね押し力を加えている。プランジャー先端側は、歪みゲージホルダ２の内面側とされ、歪みゲージホルダ２の先端部内面側（その裏側である先端部内面側には歪みゲージ３が装着されている）はプランジャー先端部１１と接触するものとされる。又、スプリングプランジャー４の後端面には六角レンチ孔１２が設けてある。 The structure of the strain gauge pressing portion 100 will be described in more detail.
The strain gauge 3 is detachable on the outer surface side of the strain gauge holder 2 which is hollow and has a rectangular cross section (which may be said to be the lower end in the figure, but is referred to as the front end for convenience in the pressing direction). It is attached to.
An inner string spring (plunger internal spring) 10 is built in the plunger main body case 9 of the spring plunger 4 and applies a spring pressing force to the plunger tip 11. The distal end side of the plunger is the inner surface side of the strain gauge holder 2, and the inner surface side of the distal end portion of the strain gauge holder 2 (the strain gauge 3 is mounted on the inner surface side of the distal end portion which is the back side) is the distal end portion of the plunger. 11 is to be contacted. A hexagon wrench hole 12 is provided on the rear end surface of the spring plunger 4.

スプリングプランジャー４は、ブラケット１に対しプランジャー先端側をマグネット８側と同側（ブラケット１の下面側）として、ブラケット１を貫通し、プランジャー後端側が、ブラケット１に溶接等で固定したプランジャー位置調整ナット５と螺合されており、プランジャー後端面の六角レンチ孔１２に六角レンチを入れて回すことでスプリングプランジャー４をその長さ方向に前進後退させることが可能である。   The spring plunger 4 penetrates the bracket 1 with the front end side of the plunger being the same side as the magnet 8 side (the lower surface side of the bracket 1) with respect to the bracket 1, and the rear end side of the plunger is fixed to the bracket 1 by welding or the like. The spring plunger 4 is screwed into the plunger position adjusting nut 5 and the spring plunger 4 can be advanced and retracted in the length direction by inserting and turning the hexagon wrench in the hexagon wrench hole 12 on the rear end surface of the plunger.

スプリングプランジャー４のプランジャー先端部１１近傍には、押さえスプリング調整ナット７が螺合され、この押さえスプリング調整ナット７と歪みゲージホルダ２の後端部内面側とは外側弦巻ばね（歪みゲージ押さえスプリング）６で接続されている。外側弦巻ばね６は、スプリングプランジャー４のプランジャー本体ケース９の外周面側に巻かれており、これと、プランジャー内スプリングである内側弦巻ばね１０とが同心円柱状をなしていることで、コンパクトな構造が実現している。   A holding spring adjusting nut 7 is screwed in the vicinity of the plunger tip 11 of the spring plunger 4. Spring) 6 is connected. The outer string spring 6 is wound around the outer peripheral surface side of the plunger main body case 9 of the spring plunger 4, and this and the inner string spring 10 which is the plunger inner spring form a concentric columnar shape. A compact structure has been realized.

上記構造において、歪みゲージ３は、歪みゲージホルダ２、外側弦巻ばね６、押さえスプリング調整ナット７、スプリングプランジャー４、プランジャー位置調整ナット５を順次介して、ブラケット１の他端部で保持されている。プランジャー先端部１１を介した内側弦巻ばね１０からのばね力（ばね押し力）で測定対象箇所表面に押付け可能であり、マグネット８を測定対象物に固定した状態で、内側弦巻ばね１０のばね力は押さえスプリングプランジャー４を回すことにより（プランジャー本体ケース９が前進後退→プランジャー先端部１１は測定対象物で阻止されて前進できずプランジャー本体ケース９に対し出没方向に移動→プランジャー内スプリングである内側弦巻ばね１０の長さが変化するから）調整できる。外側弦巻ばね６のばね力（ばね押し力）で歪みゲージホルダ２の先端部をプランジャー先端部１１に押し付け可能であり、スプリング調整ナット７を回すことにより外側弦巻ばね６のばね力を調整できる。   In the above structure, the strain gauge 3 is held at the other end of the bracket 1 through the strain gauge holder 2, the outer string spring 6, the holding spring adjustment nut 7, the spring plunger 4, and the plunger position adjustment nut 5 in order. ing. The spring of the inner string-wound spring 10 can be pressed against the surface of the object to be measured by the spring force (spring pushing force) from the inner string-wound spring 10 via the plunger tip 11 and the magnet 8 is fixed to the object to be measured. The force is turned by turning the holding spring plunger 4 (the plunger main body case 9 moves forward and backward → the plunger tip 11 is blocked by the object to be measured and cannot move forward, and moves in the protruding and retracting direction with respect to the plunger main body case 9 → plan Adjustment is possible because the length of the inner chord spring 10 that is a spring in the jar changes). The distal end portion of the strain gauge holder 2 can be pressed against the plunger distal end portion 11 by the spring force (spring pushing force) of the outer chord spring 6, and the spring force of the outer chord spring 6 can be adjusted by turning the spring adjustment nut 7. .

本発明の歪み測定器（略して本測定器）において、２つの弦巻ばね６，１０の合計のばね押し力は、過小であると歪みゲージと測定対象箇所表面との密着性が低下して正しい測定値が得られない場合があるため、被測定面部の単位面積当たりにして０．１４１ＭＰａ以上が好適であり、一方、過大であると、歪みゲージの抵抗測定用ワイヤが損傷して正しい測定値が得られない場合があるため、被測定面部の単位面積当たりにして０．３９６ＭＰａ以下が好適である。尚、自明なことながら、マグネット８は、これがブラケット１を介して生じる磁気吸着力のモーメントが、同ブラケット１を介して生じるばね押し力のモーメント未満であると、測定対象物から剥がれてしまうから、前記磁気吸着力のモーメントが前記ばね押し力のモーメント以上である磁気吸着力を有するマグネットを市販品の中から適宜選択して用いるとよい。   In the strain measuring instrument of the present invention (abbreviated to this measuring instrument for short), if the total spring pushing force of the two string springs 6 and 10 is too small, the adhesion between the strain gauge and the surface of the measuring object is reduced, which is correct. Since the measured value may not be obtained, 0.141 MPa or more is preferable per unit area of the surface portion to be measured. On the other hand, if it is excessive, the resistance measurement wire of the strain gauge is damaged and the correct measured value is obtained. Therefore, 0.396 MPa or less per unit area of the surface portion to be measured is preferable. In addition, it is obvious that the magnet 8 is peeled off from the object to be measured when the moment of the magnetic attractive force generated via the bracket 1 is less than the moment of the spring pressing force generated via the bracket 1. A magnet having a magnetic attraction force in which the moment of the magnetic attraction force is equal to or greater than the moment of the spring pushing force may be appropriately selected from commercially available products.

又、本測定器の較正に際し、ばね力の調整を効率よく行う観点から、２つの弦巻ばねの一方と他方とで、ばね定数に大小の差、好ましくは大/小の比が２〜１０になる程度の差をつけておくことが好ましい。例えば図１の例で、作業性の点で好ましくは内側弦巻ばね１０を粗調整用、外側弦巻ばね６を微調整用とし、粗調整用のばね定数は微調整用のばね定数に対し２倍〜１０倍程度としておくことで、ばね押し力調整に要する時間が５０％以上減と格段に短縮するので好ましい。   Also, from the viewpoint of efficiently adjusting the spring force when calibrating the measuring instrument, the difference in spring constant between one and the other of the two string-wound springs, preferably the large / small ratio is 2-10. It is preferable to give a certain difference. For example, in the example of FIG. 1, from the viewpoint of workability, the inner string spring 10 is preferably used for coarse adjustment and the outer string spring 6 is used for fine adjustment. The spring constant for coarse adjustment is twice the spring constant for fine adjustment. It is preferable to set it to about 10 times because the time required for adjusting the spring pressing force is remarkably shortened by 50% or more.

図１に示した本測定器例を用いた場合（ケース１）と、同じ歪みゲージを従来通り接着剤で貼付して用いた場合（ケース２）とで、歪み測定結果を比較する実験を行った。尚、ケース１では被測定面部の前処理（錆除去+磨き+脱脂）は行わず、ケース２では該前処理を行った。本測定器例では、内側弦巻ばねのばね定数（大）/外側弦巻ばねのばね定数（小）の比は１６．９、両者合計のばね押し力の調整可能範囲は０．１４４〜０．４１７ＭＰａとした。マグネットは最大吸着力（単位面積当たり）が０．１５９ＭＰａである。尚、本測定器例において、前記ばね押し力調整可能範囲の上限のばね押し力を加えてもマグネットは材料表面上で不動の状態を保っている。測定対象の材料は、ＪＩＳ ＳＳ４００のＦＢ５０×６（幅５０ｍｍ、厚さ６ｍｍのフラットバー）を用いた。   An experiment was conducted to compare the strain measurement results between the case of using the present measuring instrument shown in FIG. 1 (Case 1) and the case of using the same strain gauge attached with an adhesive as usual (Case 2). It was. In case 1, the pretreatment (rust removal + polishing + degreasing) of the surface portion to be measured was not performed, and in case 2, the pretreatment was performed. In this measuring device example, the ratio of the spring constant (large) of the inner chord spring / the spring constant (small) of the outer chord spring is 16.9, and the adjustable range of the total spring pressing force is 0.144 to 0.417 MPa. It was. The magnet has a maximum attractive force (per unit area) of 0.159 MPa. In this example of the measuring instrument, the magnet remains stationary on the material surface even when the upper limit of the spring pressing force adjustable range is applied. As a material to be measured, FB50 × 6 (flat bar having a width of 50 mm and a thickness of 6 mm) of JIS SS400 was used.

（実験１） 材料の長手方向の一端部を不動机に万力で固定し、他端部（自由端部）との中間位置に歪みゲージを、ケース１では０．３２５ＭＰａに調整したばね押し力（被測定面部の単位面積当たり）で押付けて配置し、ケース２では貼付して配置し、自由端部にウエイトを載荷していき、歪みゲージからの電気信号を常法に従い動歪みアンプで歪み量に変換しオシロスコープにて記録し測定値とした。一方、実験条件に則った外力負荷条件下の応力-歪み計算を行い、得られた被測定面部での歪み計算値を真値とした。測定値を真値と比較したところ、真値との相対誤差の範囲が、ケース１（本発明）では５．４１％、ケース２（従来）では６．９８％であり、従来と比較して遜色ない結果が得られた。   (Experiment 1) One end of the material in the longitudinal direction is fixed to a stationary table with a vise, a strain gauge is placed at an intermediate position with the other end (free end), and in case 1, the spring pushing force is adjusted to 0.325 MPa. Placed by pressing (per unit area of the surface to be measured), affixed and placed in case 2, loaded with a weight on the free end, and distorted the electrical signal from the strain gauge with a dynamic strain amplifier according to the usual method It was converted into a quantity and recorded with an oscilloscope to obtain a measured value. On the other hand, the stress-strain calculation under an external force load condition in accordance with the experimental conditions was performed, and the obtained strain calculation value at the measured surface portion was regarded as a true value. When the measured value was compared with the true value, the range of the relative error from the true value was 5.41% in case 1 (invention) and 6.98% in case 2 (conventional), compared with the conventional value. A comparable result was obtained.

（実験２） 材料の長手方向両端部を引張試験機のチャックで把持して引張試験を行うにあたり、準備段階で材料長手方向の中間位置に歪みゲージを、ケース１では実験１と同じ値に調整したばね押し力（被測定面部の単位面積当たり）で押付けて配置し、ケース２では貼付して配置した。その後、降伏点近傍まで連続的に引張り、歪みゲージからの電気信号を常法に従い動歪みアンプで歪み量に変換しオシロスコープにて記録し測定値とした。一方、実験条件に則った外力負荷条件下の応力-歪み計算を行い、得られた被測定面部での歪み計算値を真値とした。測定値を真値と比較したところ、真値との相対誤差の範囲が、ケース１（本発明）では４．５％、ケース２（従来）では４．６％であり、従来と比較して遜色ない結果が得られた。   (Experiment 2) When carrying out a tensile test by holding both ends in the longitudinal direction of the material with a chuck of a tensile tester, the strain gauge is adjusted at the intermediate position in the longitudinal direction of the material in the preparation stage, and the same value as in Experiment 1 is adjusted in Case 1 The spring was pressed and arranged with the spring pressing force (per unit area of the surface area to be measured). After that, it was continuously pulled to the vicinity of the yield point, and the electric signal from the strain gauge was converted into a strain amount by a dynamic strain amplifier according to a conventional method and recorded with an oscilloscope to obtain a measured value. On the other hand, the stress-strain calculation under an external force load condition in accordance with the experimental conditions was performed, and the obtained strain calculation value at the measured surface portion was regarded as a true value. When the measured value was compared with the true value, the range of the relative error from the true value was 4.5% in case 1 (invention) and 4.6% in case 2 (conventional), compared with the conventional value. A comparable result was obtained.

（ケース３） ＪＩＳ ＳＳ４００を母材として図２に示すような隅肉溶接構造部材を作製し、ホットスポット部の残留応力を求めるにあたり、同図に示すとおりケース１と同じ本測定器例を設置し、該設置範囲を含む小領域を切り出すことで前記隅肉溶接の溶接熱応力による残留歪み（弾性歪み）を解放し、該解放される歪み量をケース１と同様な方法で記録した。被測定面部の前処理（錆除去+磨き+脱脂）はケース１と同様、行わなかった。又、歪みゲージの設置（マグネット固定＋ばね押し力調整）に要した時間を記録した。   (Case 3) Using the JIS SS400 as a base material, a fillet welded structural member as shown in FIG. 2 is prepared, and when the residual stress in the hot spot portion is determined, the same measuring instrument example as in Case 1 is installed as shown in FIG. Then, by cutting out a small region including the installation range, the residual strain (elastic strain) due to the welding thermal stress of the fillet weld was released, and the released strain amount was recorded in the same manner as in Case 1. The pretreatment (rust removal + polishing + degreasing) of the surface to be measured was not performed as in Case 1. In addition, the time required for installing the strain gauge (magnet fixing + spring pushing force adjustment) was recorded.

（ケース４） ケース３において、本測定器例を用いる代わりに、ケース２と同様、被測定面部の前処理（錆除去+磨き+脱脂）を行った後、歪みゲージを貼付し、この点以外はケース３と同様（切り出し領域も同じ）にして、歪み量を記録した。又、歪みゲージの設置（被測定面部の前処理＋歪みゲージ貼付）に要した時間を記録した。
ケース３（本発明）における歪み量の測定結果は、ケース４（従来）を１００とした相対値で９７であり、従来とほぼ同等の測定結果であった。一方、ケース３（本発明）における歪みゲージの設置に要した時間は、ケース４（従来）を１００とした相対値で６であり、従来と比べて格段に短縮された。 (Case 4) Instead of using this measuring instrument example in Case 3, after pre-processing (rust removal + polishing + degreasing) of the surface to be measured in the same way as Case 2, a strain gauge is attached, and other than this point Was recorded in the same manner as in Case 3 (the cutout area was the same). In addition, the time required for installing the strain gauge (pretreatment of the surface to be measured + attaching the strain gauge) was recorded.
The measurement result of the amount of distortion in case 3 (present invention) was 97 as a relative value with respect to case 4 (conventional) as 100, which was almost the same as the conventional measurement result. On the other hand, the time required for installing the strain gauge in case 3 (present invention) was 6 as a relative value with respect to case 4 (conventional) as 100, which was significantly shortened compared to the conventional case.

１ ブラケット
２ 歪みゲージホルダ
３ 歪みゲージ
４ スプリングプランジャー
５ プランジャー位置調整ナット
６ 歪みゲージ押さえスプリング（外側弦巻ばね）
７ 押さえスプリング調整ナット
８ マグネット
９ プランジャー本体ケース
１０ プランジャー内スプリング（内側弦巻ばね）
１１ プランジャー先端部
１２ 六角レンチ孔
１３ マグネット締結ボルト
１００ 歪みゲージ押さえ部 1 Bracket 2 Strain Gauge Holder 3 Strain Gauge 4 Spring Plunger 5 Plunger Position Adjustment Nut 6 Strain Gauge Press Spring (Outer String Winding Spring)
7 Holding spring adjustment nut 8 Magnet 9 Plunger body case 10 Spring in plunger (inner chord spring)
11 Plunger tip 12 Hexagon wrench hole 13 Magnet fastening bolt 100 Strain gauge holding part

Claims (2)

ブラケットの長さ方向の一端部に測定対象物に固定するためのマグネットを、他端部に歪みゲージ押さえ部を有する歪み測定器であって、前記歪みゲージ押さえ部は、同心円柱状に配置した２つの弦巻ばねの各ばね力を調整可能とし、該ばね力により歪みゲージを測定対象箇所表面に押付け可能に保持する構造を有することを特徴とする歪み測定器。 A magnet for fixing the object to be measured lengthwise end portions of the bracket, a strain measuring device having a strain gauge pressing portion at the other end, the strain gauge pressing portion was disposed concentrically columnar 2 A strain measuring instrument having a structure in which each spring force of two string springs can be adjusted, and the strain gauge is held by the spring force so as to be pressed against the surface of the measurement object. 前記同心円柱状に配置した２つの弦巻ばねは、内側弦巻ばねのばね定数が外側弦巻ばねのバネ定数の２〜１０倍であることを特徴とする請求項１に記載の歪み測定器。   2. The strain measuring instrument according to claim 1, wherein the two string-wound springs arranged in the concentric column shape have a spring constant of an inner string-wound spring that is 2 to 10 times a spring constant of an outer string-wound spring.
JP2011273311A 2011-12-14 2011-12-14 Strain measuring instrument Expired - Fee Related JP5786698B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011273311A JP5786698B2 (en) 2011-12-14 2011-12-14 Strain measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011273311A JP5786698B2 (en) 2011-12-14 2011-12-14 Strain measuring instrument

Publications (2)

Publication Number Publication Date
JP2013124910A JP2013124910A (en) 2013-06-24
JP5786698B2 true JP5786698B2 (en) 2015-09-30

Family

ID=48776244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011273311A Expired - Fee Related JP5786698B2 (en) 2011-12-14 2011-12-14 Strain measuring instrument

Country Status (1)

Country Link
JP (1) JP5786698B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105365251B (en) * 2014-08-06 2017-05-17 天津航天瑞莱科技有限公司 A hot press device for high temperature adhesive curing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58186003A (en) * 1982-04-23 1983-10-29 Toyoji Yamaguchi Pressing apparatus for adhesion of strain gauge
JPH08261345A (en) * 1995-03-24 1996-10-11 Toyota Auto Body Co Ltd Relief valve
JP2002168364A (en) * 2000-12-01 2002-06-14 Toyoda Mach Works Ltd Valve gear
JP2005114403A (en) * 2003-10-03 2005-04-28 Tokyo Sokki Kenkyusho Co Ltd Strain measuring instrument
CH703674B1 (en) * 2005-09-22 2012-03-15 Sensormate Ag Strain sensor with magnetic mounting.

Also Published As

Publication number Publication date
JP2013124910A (en) 2013-06-24

Similar Documents

Publication Publication Date Title
CN100458389C (en) Method for controlling tensile stress of a bolt shank such as a screw or dowel pin and device for carrying out said method
JP3340313B2 (en) Adhesive strength test jig
US10088378B2 (en) System for applying an ultrasonic transducer to a fastener
TW201135211A (en) Shear testing apparatus
JP5991055B2 (en) Tension compression test method and apparatus
JP5991278B2 (en) Tension compression test method and apparatus
JP5786698B2 (en) Strain measuring instrument
JP2009195984A (en) Fastener with welded ultrasonic stress transducer
CN203148582U (en) Non-adhibition type surface temperature-measuring thermocouple
WO2012166294A3 (en) Anti-vibration bar clamping tool
JP2007132759A (en) Relaxation test method, testing device and testing tool
KR20100069865A (en) Compression jig
CN109323787B (en) Contact finger clamping force measuring device
JP2006346710A (en) Stud welding gun
CN102128746A (en) Microscopic welding micro-tensile measuring instrument
US7055393B2 (en) Blind fastener setting tool
JP2005114403A (en) Strain measuring instrument
CN103600320B (en) Loading and fixing device for work vibration meter
CN105092106A (en) Anchoring force compactor
JP2017161520A (en) Device and method for mounting measuring scale
CN211602743U (en) Tensile shearing/compression shearing experimental device
TWI471560B (en) Shear stress testing device for flat plate
CN208705187U (en) A kind of NiTi memorial alloy bolt connection part is from relaxation test device
CN104460689A (en) Automatic regulating device for detection probe of electronic tension meter
CN2833565Y (en) Tensile force strength measuring head

Legal Events

Date Code Title Description
RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20130716

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20140326

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140825

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20150421

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20150422

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150608

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20150630

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150713

R150 Certificate of patent or registration of utility model

Ref document number: 5786698

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees