JPH0792068A - Fatigue test device for small test piece - Google Patents

Fatigue test device for small test piece

Info

Publication number
JPH0792068A
JPH0792068A JP25627993A JP25627993A JPH0792068A JP H0792068 A JPH0792068 A JP H0792068A JP 25627993 A JP25627993 A JP 25627993A JP 25627993 A JP25627993 A JP 25627993A JP H0792068 A JPH0792068 A JP H0792068A
Authority
JP
Japan
Prior art keywords
test piece
rod
test
detection
holding block
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
Application number
JP25627993A
Other languages
Japanese (ja)
Other versions
JP3304551B2 (en
Inventor
Keiji Sonoya
啓嗣 園家
Original Assignee
Ishikawajima Harima Heavy Ind Co Ltd
石川島播磨重工業株式会社
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 Ishikawajima Harima Heavy Ind Co Ltd, 石川島播磨重工業株式会社 filed Critical Ishikawajima Harima Heavy Ind Co Ltd
Priority to JP25627993A priority Critical patent/JP3304551B2/en
Publication of JPH0792068A publication Critical patent/JPH0792068A/en
Application granted granted Critical
Publication of JP3304551B2 publication Critical patent/JP3304551B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To lower the whole height of a device, prevent the disorder of the core of a test piece, and handle an extremely small test piece. CONSTITUTION:An upper rod 6 and a lower rod 7 are vertically arranged in a load frame 4. The lower end of the lower rod 7 is connected to an actuator 8 set on the table 1 of the load frame 4. Test piece holders 18 having attachable and detachable test piece holding blocks are installed to the lower end of the upper rod 6 and the upper end of the lower rod 7. An extensiometer 17 for detecting the elongation of a test piece 5 held by the upper and lower test piece holders 18 is provided. The detecting ends of a pair of detecting bars 16 of the extensiometer 17 are sharpened by inclining only the outside.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は大型プラントで用いられ
るボイラ等の余寿命を予測するために実機から採取した
微小サンプルを小型試験片として低サイクル疲労試験を
行うための小型試験片の疲労試験装置に関するものであ
る。
FIELD OF THE INVENTION The present invention relates to a fatigue test of a small test piece for carrying out a low cycle fatigue test using a small sample taken from an actual machine as a small test piece to predict the remaining life of a boiler or the like used in a large plant. It relates to the device.

【0002】[0002]

【従来の技術】ボイラ等の高温機器の余寿命を予測する
ため実機の疲労損傷部から大型サンプルを採取し、該サ
ンプルを試験片として疲労試験装置により低サイクル疲
労試験を行うことが従来より行われている。
2. Description of the Related Art In order to predict the remaining life of high-temperature equipment such as boilers, it has been a conventional practice to take a large sample from a fatigue-damaged portion of an actual machine and use the sample as a test piece to perform a low-cycle fatigue test using a fatigue tester. It is being appreciated.

【0003】上記従来の疲労試験装置は、図8にその本
体部の一例を示す如く、テーブル1の左右位置に支柱2
を立設すると共に、該左右の支柱2の上端間を上板3に
より連結してロードフレーム4を構成し、該ロードフレ
ーム4内に、下端部に試験片5の軸方向一端部を把持さ
せるようにした上部ロッド6と、上端部に試験片5の軸
方向他端部を把持させるようにした下部ロッド7とを上
下方向に対向させて配置して、上記上部ロッド6の上端
を、上記上板3側に支持させると共に、上記下部ロッド
7の下端を、上記テーブル1の下部にアクチュエータと
して設置したシリンダ8のロッド9先端に接続フランジ
13を介して連結し、且つ上記上部ロッド6の下部と下
部ロッド7の上部を包囲する位置に、上下部ロッド6,
7間に把持された試験片5を加熱するための加熱炉10
を配置し、更に、該加熱炉10内に挿入させた一対の検
出棒11の先端を試験片5に押接させてその伸び量を検
出するようにした伸び計12を、上記加熱炉10の外壁
部に設置した構成としてある。又、上記従来の伸び計1
2は、図9に一例を示す如く、一対の検出棒11の先端
部に、テーパ面11aを両側に形成して軸芯O上で尖る
ようにすると共に、両テーパ面11aでなす頂角を検出
端11bとして、両検出端11bの間を試験片5に対す
る検出長さGLとするようにしてある。15はロードセ
ルを示す。
The above-mentioned conventional fatigue test apparatus has columns 2 at the left and right positions of the table 1, as shown in FIG.
And the upper ends of the left and right columns 2 are connected by an upper plate 3 to form a load frame 4, and the lower end of the load frame 4 holds one end of the test piece 5 in the axial direction. The upper rod 6 and the lower rod 7 having the upper end portion which grips the other end portion in the axial direction of the test piece 5 are arranged so as to face each other in the vertical direction, and the upper end of the upper rod 6 is While supporting it on the upper plate 3 side, the lower end of the lower rod 7 is connected to the tip of a rod 9 of a cylinder 8 installed as an actuator in the lower portion of the table 1 via a connecting flange 13, and the lower portion of the upper rod 6 is connected. And the upper and lower rods 6, at the position surrounding the upper part of the lower rod 7.
A heating furnace 10 for heating the test piece 5 held between 7
And the extensometer 12 in which the tips of a pair of detection rods 11 inserted into the heating furnace 10 are pressed against the test piece 5 to detect the amount of expansion thereof. It is installed on the outer wall. Moreover, the above-mentioned conventional extensometer 1
As shown in FIG. 9, an example of FIG. 9 shows that the pair of detection rods 11 have tapered surfaces 11a formed on both sides thereof so as to be sharpened on the axis O and the apex angle formed by the two tapered surfaces 11a. As the detection end 11b, the detection length GL for the test piece 5 is set between the both detection ends 11b. Reference numeral 15 indicates a load cell.

【0004】上記従来の試験片5は、図10に一例を示
す如く、実機の一部から採取した大型サンプルを軸状に
加工した後、ねじ部5aを製作するようにしてあり、両
端部のねじ部5aを、上部ロッド6の下端面部と下部ロ
ッド7の上端面部に設けてあるねじ穴14に、それぞれ
ねじ込むことにより取り付けることができるようにして
ある。
In the conventional test piece 5, as shown in an example in FIG. 10, a large sample taken from a part of an actual machine is processed into a shaft shape, and then a screw portion 5a is manufactured. The screw portion 5a can be attached by screwing into the screw holes 14 provided in the lower end surface portion of the upper rod 6 and the upper end surface portion of the lower rod 7, respectively.

【0005】[0005]

【発明が解決しようとする課題】ところが、上記従来の
疲労試験装置の場合、次の如き問題がある。 上下部ロッド6,7の各ねじ穴14に試験片5の各ね
じ部5aを直接ねじ込んで取り付ける方式であるため、
試験片5の回転操作に伴って、上下部ロッド6,7を同
時に昇降操作することが必要であり、試験片5の取り付
け、取り外し作業が面倒である。 伸び計12の検出棒11の先端形状は単に軸芯O上で
交わる如き2つのテーパ面11aによって尖らしてある
だけであり、しかも平行に配してある両検出棒11の近
接、離反変位に基づいて試験片5の伸び量を検出するも
のであるため、2本の検出棒11の検出端11bを近接
配置するのに限度があり、試験可能な試験片5のサイズ
としては、たとえば、全長が150mm、直径が10mm、
検出長さGLが20mm程度のものまでに限定され、それ
より小型の試験片には実施できない。 アクチュエータとしてのシリンダ8から下部ロッド7
の上端までの距離が長いので、装置全高が高くなるばか
りでなく、シリンダ8と試験片5との軸芯に狂いが生じ
易い。
However, the above-mentioned conventional fatigue test apparatus has the following problems. Since each screw part 5a of the test piece 5 is directly screwed into each screw hole 14 of the upper and lower rods 6 and 7 to be mounted,
As the test piece 5 is rotated, the upper and lower rods 6 and 7 must be moved up and down at the same time, and the work of mounting and removing the test piece 5 is troublesome. The tip shape of the detection rod 11 of the extensometer 12 is only sharpened by two tapered surfaces 11a which intersect on the axis O, and is based on the displacement of both detection rods 11 arranged in parallel. Since the amount of elongation of the test piece 5 is detected by this method, there is a limit to placing the detection ends 11b of the two detection rods 11 close to each other, and the size of the test piece 5 that can be tested is, for example, the total length. 150mm, diameter 10mm,
The detection length GL is limited to about 20 mm, and it cannot be applied to test pieces smaller than that. Cylinder 8 as actuator to lower rod 7
Since the distance to the upper end of the cylinder is long, not only the total height of the apparatus becomes high, but also the axial center between the cylinder 8 and the test piece 5 is likely to be dislocated.

【0006】そこで、本発明は、試験片を簡単にしかも
精度よくセットできるようにすると共に、従来よりも更
に小型の試験片に対しても試験を実施できるようにし、
しかも装置全高を低くしてコンパクト化を図り得るよう
にしようとするものである。
Therefore, the present invention makes it possible to set a test piece easily and accurately, and also to perform a test on a test piece which is smaller than the conventional one.
In addition, the overall height of the device is reduced so that the device can be made compact.

【0007】[0007]

【課題を解決するための手段】本発明は、上記課題を解
決するために、テーブルと該テーブル上に立設した左右
の支柱と該左右の支柱の上端間を連結する上板とからロ
ードフレームを構成し、該ロードフレーム内に、上部ロ
ッドと下部ロッドとを上下方向に対向させて配置して、
上記上部ロッドの上端部を上記上板側に支持させると共
に、上記下部ロッドの下端部を上記テーブル上に設置し
たアクチュエータに連結し、且つ表面の軸芯位置に芯出
し用突起を有して上部又は下部ロッドの先端面に固定す
るようにしたベースフランジと、先端面部に取付ピース
を介して試験片を着脱可能に取り付けるための所要深さ
のねじ穴を有し且つ基端面部に上記芯出し用突起と嵌合
し得る芯出し用凹部を有する試験片保持ブロックと、該
試験片保持ブロックの外周部に螺合して試験片保持ブロ
ックをベースフランジに着脱可能に固定するようにした
押えナットとからなる試験片ホルダーを、それぞれ上部
ロッドの下端と下部ロッドの上端に対向させて備え、更
に、上記上部ロッド及び下部ロッドの各試験片ホルダー
間に保持させた試験片の伸びを検出するための伸び計を
備えた構成とする。
In order to solve the above-mentioned problems, the present invention provides a load frame including a table, left and right support columns standing on the table, and an upper plate connecting between upper ends of the left and right support columns. In the load frame, the upper rod and the lower rod are arranged to face each other in the vertical direction,
The upper end of the upper rod is supported on the upper plate side, the lower end of the lower rod is connected to the actuator installed on the table, and the upper part has a centering protrusion at the surface axial position. Alternatively, it has a base flange that is fixed to the tip surface of the lower rod, and a screw hole of the required depth for detachably attaching the test piece through the attachment piece to the tip surface portion, and the centering is performed on the base end surface portion. Test piece holding block having a centering recess that can be fitted with the projection, and a holding nut screwed onto the outer peripheral portion of the test piece holding block to detachably fix the test piece holding block to the base flange. And a test piece holder consisting of a test piece holder and a test piece holder, respectively, which face the lower end of the upper rod and the upper end of the lower rod, and are held between the test piece holders of the upper rod and the lower rod. A configuration with extensometer for detecting the elongation of the strip.

【0008】又、伸び計を、中間部をピンにより回動自
在に連結した一対のアームの一端に、試験片に対する検
出端が互いに近接するよう外側のみを傾斜させて尖らせ
てなる検出棒をそれぞれ取り付け、更に、上記両アーム
の他端部間に、該アーム間の変位を検出する差動トラン
スを取り付けた構成とする。
Further, the extensometer is provided with a detection rod, which is formed by slanting only the outside so that the detection ends for the test piece are close to each other, at one end of a pair of arms whose intermediate portions are rotatably connected by pins. Each of them is attached, and a differential transformer for detecting a displacement between the arms is attached between the other ends of the both arms.

【0009】[0009]

【作用】試験片の低サイクル疲労試験を行う場合は、上
部ロッドの試験片ホルダーと下部ロッドの試験片ホルダ
ーとの間に試験片をセットし、該試験片に伸び計の一対
の検出棒の検出端を押し当てた状態で、アクチュエータ
を作動させるが、この際、上記試験片ホルダーは、ベー
スフランジに対し保持ブロックが着脱できることから、
試験片の取り付け、取り外し作業を簡単に行うことがで
きるようになる。又、ベースフランジの芯出し用突起に
保持ブロックの芯出し用凹部が対応することから、試験
片の芯出しを確実に行うことができる。
[Function] When performing a low cycle fatigue test on a test piece, set the test piece between the test piece holder of the upper rod and the test piece holder of the lower rod, and attach the test piece of the pair of detection bars of the extensometer to the test piece. The actuator is operated with the detection end pressed, but at this time, since the holding block of the test piece holder can be attached to and detached from the base flange,
It will be possible to easily attach and detach the test piece. Further, since the centering projection of the base flange corresponds to the centering recess of the holding block, the test piece can be surely centered.

【0010】更に、伸び計の検出棒は、検出端の内側を
尖らせて互いに近接するよう偏寄させてあることから、
検出端間を微小間隔にセットでき、この間隔に応じた極
めて小型の試験片に採用することができる。
Further, since the detection rods of the extensometer are biased so that they are close to each other by sharpening the insides of the detection ends,
It is possible to set a minute interval between the detection ends, and it is possible to adopt an extremely small test piece corresponding to this interval.

【0011】[0011]

【実施例】以下、本発明の実施例を図面を参照して説明
する。
Embodiments of the present invention will be described below with reference to the drawings.

【0012】図1乃至図7は本発明の一実施例を示すも
ので、図8に示した従来の疲労試験装置の本体部と同様
な構成を有する小型試験片の疲労試験装置において、試
験片5に圧縮力及び引張力を与えるアクチュエータとし
てのシリンダ8を、ロードフレーム4のテーブル1上に
設置し、又、上部ロッド6の下端と下部ロッド7の上端
に、試験片ホルダー18をそれぞれ取り付けて、上下の
試験片ホルダー18間にて試験片5を保持させられるよ
うにし、更に、上記試験片ホルダー18間に保持された
試験片5の伸び量を検出するために、検出棒16の先端
を特殊形状とした伸び計17を設ける。なお、図1にお
いて、19は水冷ブロックを示す。
FIGS. 1 to 7 show an embodiment of the present invention. In a fatigue test apparatus for small test pieces having the same structure as the main body of the conventional fatigue test apparatus shown in FIG. A cylinder 8 as an actuator that applies a compressive force and a tensile force to 5 is installed on the table 1 of the load frame 4, and test piece holders 18 are attached to the lower end of the upper rod 6 and the upper end of the lower rod 7, respectively. The test piece 5 is held between the upper and lower test piece holders 18, and the tip of the detection rod 16 is attached to detect the elongation amount of the test piece 5 held between the test piece holders 18. An extensometer 17 having a special shape is provided. In FIG. 1, 19 indicates a water cooling block.

【0013】上記試験片ホルダー18は、図2に下部ロ
ッド7側の部分を拡大して示す如く、内ねじ46と外ね
じ47を有して内ねじ46に試験片5のねじ部5aを螺
着させるようにした取付ピース48と、先端面部の軸芯
位置に上記取付ピース48の外ねじ47を螺合させるた
めの所要深さのねじ穴20を有し且つ基端面部の軸芯位
置に芯出し用凹部21を有し更に外周部に取付ねじ22
を設けた試験片保持ブロック23と、該試験片保持ブロ
ック23の芯出し用凹部21を嵌合させるための芯出し
用突起24を上面に有して下部ロッド7の先端面となる
上端面に固定したベースフランジ25と、該ベースフラ
ンジ25の下面に係合する当接部26aを有し且つ上記
試験片保持ブロック23の取付ねじ22に螺合するねじ
部26bを有して芯出し用凹部21と芯出し用突起24
とが嵌合させられた状態で試験片保持ブロック23、ベ
ースフランジ25上に固定するようにする押えナット2
6とからなる構成としてある。図2において、27は加
熱炉10を貫通する下部ロッド7の中間部外周に取り付
けた放熱フィンを示す。なお、上部ロッド6側の試験片
ホルダー18は、かかる下部ロッド7側の部分と上下対
称に配置構成してある。
The test piece holder 18 has an inner screw 46 and an outer screw 47, as shown in an enlarged view of the lower rod 7 side in FIG. The mounting piece 48 to be attached is provided with a screw hole 20 of a required depth for screwing the outer screw 47 of the mounting piece 48 at the axial center position of the tip end face portion, and at the axial center position of the base end face portion. It has a centering recess 21 and a mounting screw 22 on the outer periphery.
And a centering projection 24 for fitting the centering recess 21 of the test piece holding block 23 on the upper surface, which is the tip surface of the lower rod 7. It has a fixed base flange 25, a contact portion 26a that engages with the lower surface of the base flange 25, and a screw portion 26b that engages with the mounting screw 22 of the test piece holding block 23. 21 and centering protrusion 24
Presser nut 2 which is fixed on the test piece holding block 23 and the base flange 25 in a state where and are fitted.
6 is included. In FIG. 2, reference numeral 27 denotes a radiation fin attached to the outer periphery of the intermediate portion of the lower rod 7 that penetrates the heating furnace 10. The test piece holder 18 on the upper rod 6 side is vertically symmetrical with the portion on the lower rod 7 side.

【0014】又、上記伸び計17は、図3乃至図7に詳
細を示す如く、加熱炉10の側壁部に組み込むようにし
た水冷ブロック構造の蓋28の上部に固定台29を立設
し、該固定台29の上端に、左右のビーム30を水平に
張り出させると共に、該左右のビーム30の張り出し端
部間にスペーサブロック31を設け、該スペーサブロッ
ク31と固定台29の上端との間に、つまみ32の操作
によって回転できるようにした送りねじ33をビーム3
0と平行に支持させ、該送りねじ33に移動ブロック3
4を貫通螺合させ、該移動ブロック34に、上端部に調
整ナット35を備えたねじロッド36を上下方向へ貫通
させ、該ねじロッド36の下端に、スプリング37を介
して伸び計本体部38を吊り下げるようにしてある。伸
び計本体部38はピン39を支点に洗濯ばさみ状に上下
方向へ開閉可能に連結した一対のアーム40の一端部
に、石英ガラス製の検出棒16をそれぞれ取り付け、該
各検出棒16の先端部の相対向する側(内側)に、図7
に詳細を示す如く検出棒16の軸芯Oと平行な平滑面1
6aを接近するように偏寄させて形成すると共に、外側
に軸芯Oに対し傾斜するテーパ面16bを形成して、該
平滑面16aとテーパ面16bとでなす頂角を検出端1
6cとし、2本の検出棒16の各平滑面16a及び検出
端16cを接近させて小間隔の両検出端16c間を試験
片5に対する検出長さGLとするようにし、又、上記両
アーム40の他端部間に、検出棒16の検出端16c間
の変位を比例式に検出するための差動トランス41を取
り付けてなる構成としてある。なお、42は検出棒16
の先端を試験片5に押し付けるようにするためにアーム
40と蓋28との間に介装したスプリング、43は蓋2
8の検出棒貫通部44からの輻射熱がアーム40に直接
当たらないようにするための遮熱板、45は試験を実施
するとき以外にアーム40間にねじ込んでアーム40の
開閉を固定するための固定ねじを示す。
As shown in detail in FIGS. 3 to 7, the extensometer 17 has a fixing table 29 provided upright on a lid 28 having a water cooling block structure which is incorporated in the side wall of the heating furnace 10. The left and right beams 30 are horizontally projected at the upper end of the fixed base 29, and a spacer block 31 is provided between the protruding ends of the left and right beams 30, so that the spacer block 31 is located between the upper end of the fixed base 29. Then, attach the feed screw 33 that can be rotated by operating the knob 32 to the beam 3
It is supported in parallel with 0, and the moving block 3 is attached to the feed screw 33.
4 is screwed through, a screw rod 36 having an adjusting nut 35 at the upper end is passed through the moving block 34 in the vertical direction, and an extensometer body 38 is provided at the lower end of the screw rod 36 via a spring 37. Is hung. In the extensometer main body 38, the detection rods 16 made of quartz glass are attached to one end portions of a pair of arms 40 which are vertically opened and closed like clothespins with a pin 39 as a fulcrum. As shown in FIG.
A smooth surface 1 parallel to the axis O of the detection rod 16 as shown in detail in FIG.
6a is formed so as to be close to each other, and a taper surface 16b that is inclined with respect to the axis O is formed on the outer side, and the apex angle formed by the smooth surface 16a and the taper surface 16b is detected.
6c, the respective smooth surfaces 16a and the detection ends 16c of the two detection rods 16 are brought close to each other so that the detection length GL for the test piece 5 is provided between both the detection ends 16c with a small interval. A differential transformer 41 for proportionally detecting the displacement between the detection ends 16c of the detection rods 16 is attached between the other ends of the differential transformers. 42 is the detection rod 16
A spring interposed between the arm 40 and the lid 28 for pressing the tip of the lid against the test piece 5, 43 is the lid 2
A heat shield plate for preventing the radiant heat from the detection rod penetrating portion 44 of 8 directly hitting the arm 40, and 45 for fixing the opening and closing of the arm 40 by screwing between the arms 40 except when performing the test. Indicates a fixing screw.

【0015】ボイラ等の実機から採取したサンプルから
なる小型の試験片5の低サイクル疲労試験を行う場合
は、先ず、上下部ロッド6,7の先端から各試験片ホル
ダー18の試験片保持ブロック23をそれぞれ取り外す
と共に、各試験片保持ブロック23から取付ピース48
を取り外しておいて、上記取付ピース48の内ねじ46
に試験片5の両端部のねじ部5aをそれぞれ一杯にねじ
込むようにする。続いて、上記試験片保持ブロック23
のねじ穴20に試験片5の両端部に取り付けた取付ピー
ス48の外ねじ47をそれぞれねじ込むようにする。な
お、このとき、試験片5の長さが異なるときは、取付ピ
ース48のねじ込み深さを調整することによって上下の
試験片保持ブロック23間の間隔が一定のままとなるよ
うにする。次に、取付ピース48を介して両端を保持ブ
ロック23に保持させた試験片5を上下部ロッド6,7
の先端間に上下方向に向けて配置した後、たとえば、シ
リンダ8のロッド9を伸長させて上下で対向するベース
フランジ25間に試験片5を挾持させるようにする。こ
の際、ベースフランジ25の芯出し用突起24に保持ブ
ロック23の芯出し用凹部21を嵌合させることによ
り、試験片5の芯出しが確実に行われる。更に、各保持
ブロック23の取付ねじ22に押えナット26を螺合さ
せて締め付けることにより、上下部ロッド6,7間に試
験片5がセットされる。
When carrying out a low cycle fatigue test of a small test piece 5 made of a sample taken from an actual machine such as a boiler, first, the test piece holding block 23 of each test piece holder 18 from the tips of the upper and lower rods 6 and 7. And remove the test piece holding block 23 from the mounting piece 48
Is removed, and the inner screw 46 of the mounting piece 48 is removed.
Then, the threaded portions 5a at both ends of the test piece 5 are fully screwed. Subsequently, the test piece holding block 23
The outer screws 47 of the attachment pieces 48 attached to both ends of the test piece 5 are respectively screwed into the screw holes 20 of FIG. At this time, when the lengths of the test pieces 5 are different, the screwing depth of the mounting piece 48 is adjusted so that the interval between the upper and lower test piece holding blocks 23 remains constant. Next, the test piece 5 whose both ends are held by the holding block 23 via the mounting pieces 48 is attached to the upper and lower rods 6, 7.
After being arranged in the vertical direction between the tips of the test pieces 5, for example, the rod 9 of the cylinder 8 is extended to hold the test piece 5 between the base flanges 25 facing each other in the vertical direction. At this time, by fitting the centering projection 21 of the base flange 25 into the centering recess 21 of the holding block 23, the test piece 5 is reliably centered. Furthermore, the test piece 5 is set between the upper and lower rods 6 and 7 by screwing the holding nut 26 into the mounting screw 22 of each holding block 23 and tightening the nut.

【0016】次に、伸び計17の各検出棒16の検出端
16cを上記試験片5に直角に押し当てるようにセット
した後、シリンダ8のロッド9を伸縮作動させて試験片
5の軸方向に圧縮力と引張力とを作用させるようにす
る。これにより、試験片5の伸びが伸び計17によって
求められる。すなわち、伸び計17の検出棒16が取り
付けてある一対のアーム40はピン39により開閉自在
に連結された構成となっているため、試験片5の伸びに
基づいて一対の検出棒16が上下に変位すると、その変
位はアーム40の一端からピン39を介してアーム40
の他端へ伝えられ、このアーム40の他端間の変位が差
動トランス41によって比例的に検出されることにな
る。
Next, after setting the detection ends 16c of the detection rods 16 of the extensometer 17 so as to press the test piece 5 at a right angle, the rod 9 of the cylinder 8 is expanded and contracted to move the test piece 5 in the axial direction. A compressive force and a tensile force are applied to. Thereby, the elongation of the test piece 5 is obtained by the extensometer 17. That is, since the pair of arms 40 to which the detection rods 16 of the extensometer 17 are attached are openably and closably connected by the pins 39, the pair of detection rods 16 are vertically moved based on the extension of the test piece 5. When the arm 40 is displaced, it is displaced from one end of the arm 40 via the pin 39.
Is transmitted to the other end of the arm 40 and the displacement between the other ends of the arms 40 is proportionally detected by the differential transformer 41.

【0017】上記において、試験片5は試験片ホルダー
18を用いてセットするようにしてあるため、取り付
け、取り外し作業を簡単に行うことができる。すなわ
ち、試験片5のねじ部5aをねじ込むようにした取付ピ
ース48は試験片保持ブロック23に対し着脱可能であ
り、且つ該試験片保持ブロック23は押えナット26の
回転操作によって着脱が自在であることから、加熱炉1
0の外の広いスペースで試験片5を保持ブロック23に
取り付けることができ、従来のように、試験片5を回転
させながら上下部ロッド6,7の昇降位置を調整する等
の面倒な作業を行わなくても済むようになる。又、上記
試験片保持ブロック23のねじ穴20に対する取付ピー
ス48のねじ込み深さを調整することができるので、試
験片5の長さが異なる場合でも試験片保持ブロック23
の部分で簡単に対処することができる。更に、伸び計1
7の検出棒16の先端形状を、図7に示す如く外側のみ
を傾斜させて内側の平滑面に沿い尖らせてあるため、各
検出棒16の検出端16c間の間隔を小さく設定するこ
とができる。したがって、たとえば、全長が30mm、直
径が2mm、検出長さGLが2mm程度の極めて小型の試験
片5に対しての低サイクル疲労試験を行うことができ
る。
In the above description, since the test piece 5 is set by using the test piece holder 18, the attaching and detaching work can be easily performed. That is, the mounting piece 48 into which the screw portion 5a of the test piece 5 is screwed can be attached to and detached from the test piece holding block 23, and the test piece holding block 23 can be attached and detached by rotating the holding nut 26. From that, heating furnace 1
The test piece 5 can be attached to the holding block 23 in a wide space outside 0, and the laborious work such as adjusting the elevating position of the upper and lower rods 6 and 7 while rotating the test piece 5 can be performed as in the conventional case. You don't have to do it. Further, since the screwing depth of the mounting piece 48 into the screw hole 20 of the test piece holding block 23 can be adjusted, even if the length of the test piece 5 is different, the test piece holding block 23 can be adjusted.
Can be easily dealt with. Furthermore, extensometer 1
As shown in FIG. 7, the tip shape of the detection rod 16 of No. 7 is slanted only on the outer side and is sharpened along the inner smooth surface. Therefore, the interval between the detection ends 16c of the detection rods 16 can be set small. it can. Therefore, for example, a low cycle fatigue test can be performed on an extremely small test piece 5 having a total length of 30 mm, a diameter of 2 mm, and a detection length GL of about 2 mm.

【0018】因に、21/4Cr−1Mo鋼製の直径2
mmサイズと10mmサイズの試験片を作り、室温と600
℃でそれぞれ低サイクル疲労試験を行ったところ、いず
れのサイズにてもほぼ同じ結果が得られた。
Incidentally, the diameter 2 made of 21 / 4Cr-1Mo steel is used.
mm size and 10 mm size test pieces are made, and room temperature and 600
When the low cycle fatigue test was performed at each temperature, the same result was obtained regardless of the size.

【0019】又、本発明においては、試験片5に圧縮
力、引張力を与えるアクチュエータとしてのシリンダ8
がテーブル1上に設置してあるため、シリンダ8がテー
ブル1下に設置してある従来型式に比して、シリンダ8
から試験片5までの距離が短かく、したがって、装置全
高が低くなってコンパクトになるばかりでなく、シリン
ダ8と試験片5との間での軸芯に狂いが生じにくくなる
利点がある。
Further, in the present invention, the cylinder 8 as an actuator that applies a compressive force and a tensile force to the test piece 5.
Is installed on the table 1, the cylinder 8 is installed on the table 1 under the table 1 as compared with the conventional model installed on the table 1.
The distance from the test piece 5 to the test piece 5 is short, and therefore, the overall height of the apparatus is low, which not only makes the apparatus compact, but also has the advantage that the axial center between the cylinder 8 and the test piece 5 is less likely to be displaced.

【0020】なお、本発明は上記実施例のみに限定され
るものではなく、たとえば、本装置を用いて、少量ハイ
テク材の高温強度評価を行うようにしてもよいこと、そ
の他本発明の要旨を逸脱しない範囲内において種々変更
を加え得ることは勿論である。
The present invention is not limited to the above-described embodiments, and for example, the present apparatus may be used to evaluate the high temperature strength of a small amount of high-tech material, and other points of the present invention. It goes without saying that various changes can be made without departing from the scope.

【0021】[0021]

【発明の効果】以上述べた如く、本発明の小型試験片の
疲労試験装置によれば、下記の如き優れた効果を発揮す
る。 ロッドに固定したベースフランジに対して着脱可能な
保持ブロックを有する試験片ホルダーを用いて試験片を
セットさせるようにしたので、試験片の取り付け、取り
外しを容易に行うことができ、且つ試験片ホルダーの一
部である取付ピースの試験片ホルダーに対するねじ込み
深さを調整することができることから、異なる長さの試
験片も容易に保持させて試験を行わせることができ、
又、保持ブロックをベースフランジに固定する際に、芯
出し用突起に芯出し用凹部を嵌合させることができるた
め、試験片の芯を確実に出すことができる。 開閉式のアームの一端に、試験片に対する検出端を互
いに近接するよう偏寄させて形成した検出棒を取り付
け、且つアームの他端部間に差動トランスを取り付けた
構成の伸び計を用いることで、検出棒の検出端間の間隔
を小さく設定することができ、従来実施できなかったよ
うな小型の試験片の疲労試験の実施を可能とすることが
できる。 アクチュエータをテーブル上に設置してアクチュエー
タから試験片に至る長さを従来装置よりも短かくしたの
で、装置全高を低くできてコンパクト化を図ることがで
きると共に、アクチュエータと試験片との軸芯をずれに
くくすることができて、試験精度を向上することができ
る。
As described above, according to the fatigue test apparatus for small test pieces of the present invention, the following excellent effects are exhibited. Since the test piece holder has a holding block that can be attached to and detached from the base flange fixed to the rod, the test piece can be set and removed easily, and the test piece holder can be easily attached. Since it is possible to adjust the screwing depth of the mounting piece that is a part of the test piece holder, it is possible to easily hold the test pieces of different lengths and perform the test,
Further, when the holding block is fixed to the base flange, the centering projection can be fitted into the centering recess, so that the core of the test piece can be surely taken out. Use an extensometer with a structure in which a detection rod formed by biasing the detection ends of the test piece close to each other is attached to one end of the openable arm, and a differential transformer is attached between the other ends of the arms. Thus, the distance between the detection ends of the detection rods can be set small, and it becomes possible to carry out a fatigue test on a small test piece that could not be carried out in the past. Since the actuator is installed on the table and the length from the actuator to the test piece is shorter than that of the conventional device, the overall height of the device can be reduced and compactness can be achieved, and the axial center between the actuator and the test piece can be reduced. It is possible to make it difficult to shift and improve the test accuracy.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の小型試験片の疲労試験装置の一実施例
を示す本体部の概要図である。
FIG. 1 is a schematic view of a main body showing an embodiment of a fatigue test apparatus for small test pieces of the present invention.

【図2】下部ロッド部分を一部切断して示す拡大図であ
る。
FIG. 2 is an enlarged view showing a lower rod portion by partially cutting it.

【図3】伸び計の拡大図である。FIG. 3 is an enlarged view of an extensometer.

【図4】図3のA−A矢視図である。FIG. 4 is a view on arrow AA of FIG.

【図5】図3のB−B矢視図である。5 is a view taken along the line BB of FIG.

【図6】図3のC−C矢視図である。6 is a view taken along the line C-C in FIG.

【図7】図3のD部拡大図である。FIG. 7 is an enlarged view of part D in FIG.

【図8】従来の小型試験片の疲労試験装置の一例を示す
本体部の概要図である。
FIG. 8 is a schematic view of a main body showing an example of a conventional fatigue test apparatus for small test pieces.

【図9】従来用いられていた伸び計の先端部の拡大図で
ある。
FIG. 9 is an enlarged view of a tip portion of a conventionally used extensometer.

【図10】試験片の一例を示す概略図である。FIG. 10 is a schematic view showing an example of a test piece.

【符号の説明】[Explanation of symbols]

1 テーブル 2 支柱 3 上板 4 ロードフレーム 5 試験片 6 上部ロッド 7 下部ロッド 8 シリンダ(アクチュエータ) 16 検出棒 17 伸び計 18 試験片ホルダー 20 ねじ穴 21 芯出し用凹部 22 取付ねじ 23 試験片保持ブロック 24 芯出し用突起 25 ベースフランジ 26 押えナット 39 ピン 40 アーム 41 差動トランス 48 取付ピース 1 table 2 support 3 upper plate 4 load frame 5 test piece 6 upper rod 7 lower rod 8 cylinder (actuator) 16 detection rod 17 extensometer 18 test piece holder 20 screw hole 21 centering recess 22 mounting screw 23 test piece holding block 24 Centering Protrusion 25 Base Flange 26 Holding Nut 39 Pin 40 Arm 41 Differential Transformer 48 Mounting Piece

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 テーブルと該テーブル上に立設した左右
の支柱と該左右の支柱の上端間を連結する上板とからロ
ードフレームを構成し、該ロードフレーム内に、上部ロ
ッドと下部ロッドとを上下方向に対向させて配置して、
上記上部ロッドの上端部を上記上板側に支持させると共
に、上記下部ロッドの下端部を上記テーブル上に設置し
たアクチュエータに連結し、且つ表面の軸芯位置に芯出
し用突起を有して上部又は下部ロッドの先端面に固定す
るようにしたベースフランジと、先端面部に取付ピース
を介して試験片を着脱可能に取り付けるための所要深さ
のねじ穴を有し且つ基端面部に上記芯出し用突起と嵌合
し得る芯出し用凹部を有する試験片保持ブロックと、該
試験片保持ブロックの外周部に螺合して試験片保持ブロ
ックをベースフランジに着脱可能に固定するようにした
押えナットとからなる試験片ホルダーを、それぞれ上部
ロッドの下端と下部ロッドの上端に対向させて備え、更
に、上記上部ロッド及び下部ロッドの各試験片ホルダー
間に保持させた試験片の伸びを検出するための伸び計を
備えた構成を有することを特徴とする小型試験片の疲労
試験装置。
1. A load frame is composed of a table, left and right columns that are erected on the table, and an upper plate that connects upper ends of the left and right columns, and an upper rod and a lower rod are provided in the load frame. Are placed facing each other in the vertical direction,
The upper end of the upper rod is supported on the upper plate side, the lower end of the lower rod is connected to the actuator installed on the table, and the upper part has a centering protrusion at the surface axial position. Alternatively, it has a base flange that is fixed to the tip surface of the lower rod, and a screw hole of the required depth for detachably attaching the test piece through the attachment piece to the tip surface portion, and the centering is performed on the base end surface portion. Test piece holding block having a centering recess that can be fitted with the projection, and a holding nut screwed onto the outer peripheral portion of the test piece holding block to detachably fix the test piece holding block to the base flange. And a test piece holder consisting of a test piece holder and a test piece holder, respectively, which face the lower end of the upper rod and the upper end of the lower rod, and are held between the test piece holders of the upper rod and the lower rod. Fatigue test system for a small test piece and having a configuration with extensometer for detecting the elongation of the strip.
【請求項2】 伸び計を、中間部をピンにより回動自在
に連結した一対のアームの一端に、試験片に対する検出
端が互いに近接するよう外側のみを傾斜させて尖らせて
なる検出棒をそれぞれ取り付け、更に、上記両アームの
他端部間に、該アーム間の変位を検出する差動トランス
を取り付けた構成とする請求項1記載の小型試験片の疲
労試験装置。
2. An extensometer is provided with a detection rod, which is formed by slanting only the outside so that the detection ends for a test piece are close to each other, at one end of a pair of arms whose intermediate parts are rotatably connected by pins. The fatigue test device for a small test piece according to claim 1, wherein each of the arms is further mounted with a differential transformer for detecting a displacement between the arms between the other ends of the arms.
JP25627993A 1993-09-21 1993-09-21 Fatigue test equipment for small test pieces Expired - Fee Related JP3304551B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25627993A JP3304551B2 (en) 1993-09-21 1993-09-21 Fatigue test equipment for small test pieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25627993A JP3304551B2 (en) 1993-09-21 1993-09-21 Fatigue test equipment for small test pieces

Publications (2)

Publication Number Publication Date
JPH0792068A true JPH0792068A (en) 1995-04-07
JP3304551B2 JP3304551B2 (en) 2002-07-22

Family

ID=17290443

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25627993A Expired - Fee Related JP3304551B2 (en) 1993-09-21 1993-09-21 Fatigue test equipment for small test pieces

Country Status (1)

Country Link
JP (1) JP3304551B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6907677B1 (en) * 2002-01-18 2005-06-21 The United States Of America As Represented By The Secretary Of The Air Force Stable LVDT extensometer
JP2005326357A (en) * 2004-05-17 2005-11-24 Sumitomo Metal Ind Ltd Fatigue testing fixture for micro test piece
KR101893305B1 (en) * 2017-08-31 2018-08-29 경기대학교 산학협력단 Housing For Thermophysical Property Test Apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106289577B (en) * 2015-05-27 2018-12-14 宝钢特钢有限公司 For detecting the device of metal material flexivity performance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6907677B1 (en) * 2002-01-18 2005-06-21 The United States Of America As Represented By The Secretary Of The Air Force Stable LVDT extensometer
JP2005326357A (en) * 2004-05-17 2005-11-24 Sumitomo Metal Ind Ltd Fatigue testing fixture for micro test piece
KR101893305B1 (en) * 2017-08-31 2018-08-29 경기대학교 산학협력단 Housing For Thermophysical Property Test Apparatus

Also Published As

Publication number Publication date
JP3304551B2 (en) 2002-07-22

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