JPS638532A - Fatigue precracking former for fracture toughness test piece - Google Patents
Fatigue precracking former for fracture toughness test pieceInfo
- Publication number
- JPS638532A JPS638532A JP15154386A JP15154386A JPS638532A JP S638532 A JPS638532 A JP S638532A JP 15154386 A JP15154386 A JP 15154386A JP 15154386 A JP15154386 A JP 15154386A JP S638532 A JPS638532 A JP S638532A
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- fracture toughness
- toughness test
- fatigue
- crack
- 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.)
- Granted
Links
- 238000007656 fracture toughness test Methods 0.000 title claims abstract description 53
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 14
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract 1
- 238000009661 fatigue test Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は破壊靭性試験片に疲労予亀裂を形成する作業を
行うための装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for forming a fatigue pre-crack in a fracture toughness test piece.
従来、破壊靭性試験片に疲労予亀裂を形成する方法とし
て、１個の破壊靭性試験片を繰り返し荷重を付与し得る
試験装置にセットし、該試験装置によって破壊靭性試験
片に対し繰り返し荷重を与え、目視または試験片に直接
貼付したクランクゲージで亀裂長さを計測しながら行う
ものであった。Conventionally, as a method for forming fatigue pre-crack in a fracture toughness test piece, one fracture toughness test piece is set in a test device that can apply repeated loads, and the test device applies repeated loads to the fracture toughness test piece. The crack length was measured visually or with a crank gauge attached directly to the test piece.
ところで、前記した方法にあっては、１個の破壊靭性試
験片を試験装置にセットすると共に疲労予亀裂を検出す
るための検出センサをセントする度に装着および取り外
しを行わなければならず、また、破壊靭性試験片も試験
装置に対してその都度装着および取り外しを行わなけれ
ばならないため、作業能率が悪く疲労予亀裂の形成に時
間が掛かるという問題があった。By the way, in the above-mentioned method, one fracture toughness test piece must be set in the testing device, and the detection sensor for detecting fatigue pre-cracks must be installed and removed every time the sensor is inserted. Since the fracture toughness test piece must also be attached and removed from the test equipment each time, there is a problem that work efficiency is poor and it takes time for fatigue pre-crack formation.
本発明は前記した問題点を解決した破壊靭性試験片を自
動的に試験装置に送り込むと共に、疲労予亀裂を形成す
る疲労予亀裂形成装置を提供するもので、その手段は、
破壊靭性試験片に疲労予亀裂を形成するために予亀裂の
長さを、前記破壊靭性試験片の曲げ変位によって計測し
、その長さが所定の値になるまで破壊靭性試験片に所定
の繰り返し荷重を付与する疲労試験装置と、破壊靭性試
験片の多数個が着脱自在に保持されたカートリッジと、
該カートリッジから破壊靭性試験片の１個を選択して取
り出し前記疲労試験装置に固定する手段とを具備してな
る破壊靭性試験片への疲労予亀裂形成装置によってなさ
れる。The present invention solves the above problems and provides a fatigue pre-crack forming device that automatically feeds a fracture toughness test piece into a testing device and forms a fatigue pre-crack.
In order to form a fatigue pre-crack in a fracture toughness test piece, the length of the pre-crack is measured by bending displacement of the fracture toughness test piece, and the fracture toughness test piece is subjected to a predetermined repetition until the length reaches a predetermined value. A fatigue test device that applies a load, a cartridge that removably holds a large number of fracture toughness test pieces,
Fatigue pre-crack formation on fracture toughness test pieces is performed by an apparatus for forming fatigue pre-crack on fracture toughness test pieces, which comprises a means for selecting and taking out one of the fracture toughness test pieces from the cartridge and fixing it to the fatigue test apparatus.
前記した破壊靭性試験片への疲労予亀裂形成装置は、破
壊靭性試験片に疲労予亀裂を形成するために予亀裂の長
さを、前記破壊靭性試験片の曲げ変位によって計測し、
その長さが所定の値になるまで破壊靭性試験片に所定の
繰り返し荷重を付与し、該疲労予亀裂が形成されると多
数個の破壊靭性試験片を保持しているカートリッジから
次の破壊靭性試験片を取り出し疲労試験機に固定し、引
き続き該破壊靭性試験片に疲労予亀裂を形成するもので
あるから、均一な試験片を得ることができると共に省力
化が可能となるものである。The apparatus for forming a fatigue pre-crack on a fracture toughness test piece described above measures the length of a pre-crack based on the bending displacement of the fracture toughness test piece in order to form a fatigue pre-crack on the fracture toughness test piece,
A predetermined repeated load is applied to the fracture toughness test piece until its length reaches a predetermined value, and when the fatigue pre-crack is formed, the next fracture toughness test piece is transferred from the cartridge holding a large number of fracture toughness test pieces. Since the test piece is taken out and fixed in a fatigue testing machine, and then a fatigue pre-crack is formed in the fracture toughness test piece, uniform test pieces can be obtained and labor can be saved.
以下、図面を参照して本発明の一実施例を詳細に説明す
る。Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
第１図は本発明の装置の斜視図、第２図は同上の正面図
を示し、ｌは基台、２は該基台１に形成された蟻溝１ａ
にガイドされる搬送レール、３は該搬送レール２の間隔
を調整するハンドルにして、搬送レール２に螺合される
逆ねじが形成された２本の螺軸３ａを同時に同一方向に
回転するものである。そして、前記ハンドル３を回転す
ることにより、搬送レール２が求心的に移動する。４は
前記した搬送レール２にガイドされる枠体にして、前記
基台ｌに固定されたモータ５によって回転する回転軸６
によって、搬送レール２を左右動する。FIG. 1 is a perspective view of the device of the present invention, and FIG. 2 is a front view of the same as above, l is a base, and 2 is a dovetail groove 1a formed on the base 1.
3 is a handle that adjusts the interval between the transport rails 2, and simultaneously rotates two screw shafts 3a formed with reverse threads that are screwed into the transport rail 2 in the same direction. It is. By rotating the handle 3, the transport rail 2 moves centripetally. Reference numeral 4 denotes a frame body guided by the aforementioned transport rail 2, and a rotating shaft 6 rotated by a motor 5 fixed to the base l.
to move the conveyance rail 2 left and right.
また、この枠体４は搬送レール２が前記ハンドル３によ
って求心的に移動すると、中央の連結部分４ａにおいて
伸び縮みするものである。７は前記枠体４に植設された
ピン４ｂに対し上下動自在にガイドされたカートリッジ
７にして、前記枠体４に取付けられたピストン８によっ
て一定の範囲内で上下動する。また、このカートリッジ
７には所望間隔毎に破壊靭性試験片９を支持固定するた
めの支持片７ａが形成され、ここに破壊靭性試験片９が
挿入され固定される。１０は前記基台１に固定された支
持台にして、破壊靭性試験片９の長さより狭い間隔で取
付けられると共に、この支持台１０上に破壊靭性試験片
９が載置される。Furthermore, when the conveyor rail 2 is moved centripetally by the handle 3, the frame 4 expands and contracts at the central connecting portion 4a. Reference numeral 7 denotes a cartridge 7 which is guided so as to be vertically movable with respect to a pin 4b implanted in the frame 4, and is moved up and down within a certain range by a piston 8 attached to the frame 4. Further, support pieces 7a for supporting and fixing the fracture toughness test pieces 9 are formed in the cartridge 7 at desired intervals, and the fracture toughness test pieces 9 are inserted and fixed therein. Reference numeral 10 denotes a support stand fixed to the base 1, which is attached at intervals narrower than the length of the fracture toughness test piece 9, and the fracture toughness test piece 9 is placed on this support stand 10.
１１は後述する疲労試験装置１２における作動子１２ａ
と対応する位置の前記基台１に固定されたリミットスイ
ッチにして、前記枠体４の側面に突出して形成された突
起４ｃによってオン・オフするものである。なお、突起
４ｃは前記カートリッジ７の支持片７ａと対応して設け
られている。11 is an actuator 12a in a fatigue test device 12 which will be described later.
The limit switch is fixed to the base 1 at a position corresponding to the limit switch, and is turned on and off by a protrusion 4c formed protruding from the side surface of the frame 4. Note that the protrusion 4c is provided corresponding to the support piece 7a of the cartridge 7.
次に、疲労試験装置１２について説明するに、この疲労
試験装置１２は破壊靭性試験片９に繰り返し荷重を付与
するための加振機１３と、該加振機１３によって加えら
れた荷重によって破壊靭性試験片９に生じるたわみを検
出するたわみ検出器１４を備えている。また、加振機１
３には破壊靭性試験片９に直接繰り返し荷重を与える作
動子１３ａが取付けられている。Next, the fatigue test device 12 will be explained. This fatigue test device 12 includes a vibrator 13 for repeatedly applying a load to the fracture toughness test piece 9, and a vibration tester 13 for repeatedly applying a load to the fracture toughness test piece 9. A deflection detector 14 is provided to detect deflection occurring in the test piece 9. In addition, the vibration exciter 1
3 is attached with an actuator 13a that applies a repeated load directly to the fracture toughness test piece 9.
なお、前記における破壊靭性試験片９には、予め機械加
工によって切欠９ａが形成されている。Note that the fracture toughness test piece 9 described above has a notch 9a formed in advance by machining.
次に、前記した構成に基づいて動作を説明するに、先ず
、破壊靭性試験片９をカートリッジ７の各支持片７ａに
、切欠９ａを下側にして載置固定する。この状態におい
て、枠体４のピストン８を作動させ、カートリッジ７を
ピン４ｂをガイドとして上昇させる。Next, to explain the operation based on the above configuration, first, the fracture toughness test piece 9 is placed and fixed on each support piece 7a of the cartridge 7 with the notch 9a facing downward. In this state, the piston 8 of the frame 4 is operated to raise the cartridge 7 using the pin 4b as a guide.
次いで、モータ５を駆動して回転軸６を回転させると、
枠体４が搬送レール２上を第１図において左方に移動す
る。そして、枠体４の突起４ｃがリミットスイッチ１１
に当接し、該スイッチ１１を操作すると、モータ５への
通電が遮断されて、該モータ５の回転は停止し枠体４の
移動は停止する。この時、破壊靭性試験片９は加振ａ１
３における作動子１３ａの真下に位置する。この状態に
おいて、前記ピストン８を不動作状態となし、カ−トリ
ッジ４を下降させると、破壊靭性試験片９は基台１に形
成された支持台１０上に載置された状態となる。Next, when the motor 5 is driven to rotate the rotating shaft 6,
The frame body 4 moves to the left on the conveyor rail 2 in FIG. The protrusion 4c of the frame 4 is connected to the limit switch 11.
When the switch 11 is operated, the power to the motor 5 is cut off, the rotation of the motor 5 is stopped, and the movement of the frame 4 is stopped. At this time, the fracture toughness test piece 9 was subjected to vibration a1
It is located directly below the actuator 13a at 3. In this state, when the piston 8 is made inactive and the cartridge 4 is lowered, the fracture toughness test piece 9 is placed on a support 10 formed on the base 1.
次いで、疲労試験装置１１を駆動して、破壊靭性試験片
９の切欠９ａに、さらに疲労予亀裂を形成する。すなわ
ち、加振機１３を振動させて、作動子１３ａによって破
壊靭性試験片９の上面から繰り返し荷重を与える。とこ
ろで、たわみ振幅Δは、亀裂長さく切欠９ａと疲労予亀
裂の長さとの合計）がａｌからａ２に増加するに従って
増加する。そこで、破壊靭性試験片９のたわみ振幅と亀
裂長さの関係を、予め図式、関数式等の形式で図示しな
い制御回路に定めておく。また、疲労試験装置１２に、
加振機１３における作動子１３ａの変位を測定可能とす
るたわみ検出器１４を設け、加振機１３の変位と疲労試
験装置１２のたわみとが比例関係にあることからして、
たわみ検出器１４の検出結果を制御回路に伝達すること
により、このたわみ検出器１４の検出結果から破壊靭性
試験片９に生じるたわみ振幅を求める。これにより制御
回路は、予め定められているたわみ振幅と亀裂長さの関
係と、たわみ検出器１４の検出結果から求めた破壊靭性
試験片９の現実のたわみ振幅とに基づき、破壊靭性試験
片９に生じている切欠９ａ及び疲労予亀裂との亀裂長さ
ａを検出する。Next, the fatigue testing device 11 is driven to further form a fatigue pre-crack in the notch 9a of the fracture toughness test piece 9. That is, the vibration exciter 13 is vibrated, and a load is applied repeatedly from the upper surface of the fracture toughness test piece 9 using the actuator 13a. By the way, the deflection amplitude Δ increases as the crack length (the sum of the notch 9a and the fatigue pre-crack length) increases from al to a2. Therefore, the relationship between the deflection amplitude and the crack length of the fracture toughness test piece 9 is determined in advance in a control circuit (not shown) in the form of a diagram, a functional formula, or the like. In addition, the fatigue test device 12 includes
A deflection detector 14 that can measure the displacement of the actuator 13a in the vibrator 13 is provided, and since the displacement of the vibrator 13 and the deflection of the fatigue testing device 12 are in a proportional relationship,
By transmitting the detection result of the deflection detector 14 to the control circuit, the deflection amplitude generated in the fracture toughness test piece 9 is determined from the detection result of the deflection detector 14. Thereby, the control circuit controls the fracture toughness test piece 9 based on the predetermined relationship between the deflection amplitude and the crack length and the actual deflection amplitude of the fracture toughness test piece 9 obtained from the detection results of the deflection detector 14. The crack length a between the notch 9a and the fatigue pre-crack that has occurred in the notch 9a is detected.
そして、前記した如く破壊靭性試験片９に所定の疲労予
亀裂が形成され、制御回路から出力が送出されると、ピ
ストン８が再び動作してカートリッジ７を上昇させ、次
いで、モータが駆動されてリミットスイッチ１１が次の
突起４Ｃを検出するまで枠体４を左方に移動させる。リ
ミットスイッチ１１が突起４Ｃを検出すると、ピストン
８がカートリッジ７を下降させ、次の破壊靭性試験片９
を支持台１０上にｆ２置し、再び前記したと同様な動作
を行い疲労予亀裂を形成するものである。Then, as described above, when a predetermined fatigue pre-crack is formed in the fracture toughness test piece 9 and an output is sent from the control circuit, the piston 8 operates again to raise the cartridge 7, and then the motor is driven. The frame body 4 is moved to the left until the limit switch 11 detects the next projection 4C. When the limit switch 11 detects the protrusion 4C, the piston 8 lowers the cartridge 7 and passes the next fracture toughness test piece 9.
is placed f2 on the support stand 10, and the same operation as described above is performed again to form a fatigue pre-crack.
本発明は前記したように、操り返し荷重を破壊靭性試験
片に付与する疲労試験装置に対して、多数個の破壊靭性
試験片が設けられたカートリッジを順次移動させ、破壊
靭性試験片に対して疲労予亀裂を形成するようにしたの
で、均一な破壊靭性試験片を製作でき、かつ、自動化が
可能なことより製作時間の短縮が図れると共に作業の省
力化が図れるという効果を有するものである。As described above, the present invention involves sequentially moving a cartridge equipped with a large number of fracture toughness test pieces to a fatigue test device that applies a repetitive load to a fracture toughness test piece. Since a fatigue pre-crack is formed, uniform fracture toughness test pieces can be manufactured, and since automation is possible, manufacturing time can be shortened and labor can be saved.
図は本発明に係る装置の一実施例を示し、第１図は斜視
図、第２図は同上の正面図、第３図は時間に対するたわ
み、亀裂長さおよび応力を示す特性図である。
４・・・枠体、７・・・カートリッジ、９・・・破壊靭
性試験片、１２・・・疲労試験装置。
特許出願人 川崎製鉄株式会社
同 株式会社鷺宮製作所
第３図The figures show one embodiment of the device according to the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a front view of the same, and FIG. 3 is a characteristic diagram showing deflection, crack length, and stress over time. 4... Frame body, 7... Cartridge, 9... Fracture toughness test piece, 12... Fatigue test device. Patent applicant Kawasaki Steel Corporation Saginomiya Works Co., Ltd. Figure 3
Claims (1)
長さを計測し、その長さが所定の値になるまで破壊靭性
試験片に所定の繰り返し荷重を付与する疲労予亀裂形成
装置において、 予亀裂の長さを測定するためのたわみ検出器と、破壊靭
性試験片の多数個が着脱自在に保持されたカートリッジ
と、 前記カートリッジから破壊靭性試験片の１個を取り出し
固定する手段と、 を具備したことを特徴とする破壊靭性試験片への疲労予
亀裂形成装置。[Claims] In order to form a fatigue pre-crack in a fracture toughness test piece, the length of the pre-crack is measured, and a predetermined repeated load is applied to the fracture toughness test piece until the length reaches a predetermined value. A fatigue pre-crack formation device includes: a deflection detector for measuring the length of a pre-crack; a cartridge in which a large number of fracture toughness test pieces are removably held; and one fracture toughness test piece is removed from the cartridge. 1. A fatigue pre-crack formation device for fracture toughness test specimens, comprising a means for taking out and fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15154386A JPS638532A (en) | 1986-06-30 | 1986-06-30 | Fatigue precracking former for fracture toughness test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15154386A JPS638532A (en) | 1986-06-30 | 1986-06-30 | Fatigue precracking former for fracture toughness test piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS638532A true JPS638532A (en) | 1988-01-14 |
| JPH0565019B2 JPH0565019B2 (en) | 1993-09-16 |
Family
ID=15520810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15154386A Granted JPS638532A (en) | 1986-06-30 | 1986-06-30 | Fatigue precracking former for fracture toughness test piece |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS638532A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03244170A (en) * | 1990-02-22 | 1991-10-30 | Nec Corp | Magnetoresistance effect element and magnetoresistance effect head |
| JPH05272541A (en) * | 1992-03-27 | 1993-10-19 | Koyo Seiko Co Ltd | Ceramic bearing |
-
1986
- 1986-06-30 JP JP15154386A patent/JPS638532A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03244170A (en) * | 1990-02-22 | 1991-10-30 | Nec Corp | Magnetoresistance effect element and magnetoresistance effect head |
| JPH05272541A (en) * | 1992-03-27 | 1993-10-19 | Koyo Seiko Co Ltd | Ceramic bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0565019B2 (en) | 1993-09-16 |
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