JPS5831537B2 - Device for introducing fatigue pre-crack into COD test piece in fatigue test equipment - Google Patents
Device for introducing fatigue pre-crack into COD test piece in fatigue test equipmentInfo
- Publication number
- JPS5831537B2 JPS5831537B2 JP585180A JP585180A JPS5831537B2 JP S5831537 B2 JPS5831537 B2 JP S5831537B2 JP 585180 A JP585180 A JP 585180A JP 585180 A JP585180 A JP 585180A JP S5831537 B2 JPS5831537 B2 JP S5831537B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- head
- horizontal
- test
- horizontal rod
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【発明の詳細な説明】
この発明は疲労試験装置におけるＣ０Ｄ
（Ｃｒａｃｋ Ｏｐｅｎｉｎｇ Ｄｉｓｐｌａｃｅｍｅ
ｎｔ）試験片への疲労予亀裂導入用装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to C0D (Crack Opening Displacement) in fatigue test equipment.
nt) relates to a device for introducing fatigue pre-crack into a test piece.
ＣＯＤ試験は、破壊靭性試験の一種で、切欠付試験片を
所定温度で破壊させ、破壊時の切欠開口量を測定するも
のであるが、この試験には最近大きさが規定されている
機械切欠先端に、更に疲労亀裂を導入した試験片が用い
られるようになって来た。The COD test is a type of fracture toughness test in which a notched specimen is broken at a predetermined temperature and the notch opening amount at the time of failure is measured. Test specimens with additional fatigue cracks introduced at the tip have come to be used.
これは実際の破壊現象は、小さな疲労亀裂が先づ発生し
、その亀裂が大きく発達した時、急激に破壊すると云う
事実に基づき、飽性破壊の限界条件を求めるＣＯＤ試験
において、実状にできるだけ近い条件で試験をするため
である。This is based on the fact that in an actual fracture phenomenon, a small fatigue crack first occurs, and when that crack develops, it suddenly ruptures. This is to test under certain conditions.
従来の疲労亀裂を予め導入しておく装置（以下疲労予亀
裂導入装置と略称する）は、第１図乃至第３図に示すよ
うに、下部に水平台盤Ａを有し、上方に昇降ヘッドＢを
備えた疲労試験装置に装着されるもので、該水平台盤Ａ
上に水平に載置される水平台ａと、該昇降ヘッドＢに取
付けられる負荷ヘッドｂとよりなり、該水平台ａ上には
、更に、水平方向ｏ −ｏに互に平行に変位できて試験
片ｄの種類により間隔ｍが調節できるようになっており
、且つ上面に該水平変位方向ｏ −ｏと直交する方向に
夫々試験片支持ローラー１，１′を有する一双の枕台２
，２′があり、試験片支持ローラー１゜１′上に該ロー
ラーに直交して試験片ｄが一本載置されるようになって
おり、該試験片の上面中央（前記支持ローラー１，１′
で支持されるスパンの中央のこと）を横切って前記負荷
ヘッドｂの下面に設けたローラー４が当接するようにな
っており、機械切欠ｅの上方に亀裂ゲージｆを貼着して
置き、昇降ヘッドＢを水平台盤Ａに向って降下し、負荷
ヘッドｂの負荷ローラー４で試験片ｄの上面中央を繰返
し押下し、試験片ｄを彎曲させて機械切欠ｅを押開き、
疲労亀裂が機械切欠ｅの上方に、２闘程度発生し、亀裂
ゲージｆに達した時、該亀裂ゲージｆより信号を得て負
荷ヘッドＢの押下を停止し、所望の予亀裂を得ていたが
、従来のこの構成では予亀裂一本当り約１時間を要する
のに、ＣＯＤ試験は一本当り３０分で終了するため、Ｃ
ＯＤ試験には予亀裂導入作業がネックとなっており、Ｃ
ＯＤ試験作業の効率を著しく低下していた。A conventional device for pre-introducing fatigue cracks (hereinafter referred to as fatigue pre-crack introducing device) has a horizontal platform A at the bottom and an elevating head at the top, as shown in Figures 1 to 3. It is attached to a fatigue testing device equipped with a horizontal platform A.
It consists of a horizontal table a placed horizontally on top, and a load head b attached to the lifting head B. On the horizontal table a, there are also load heads which can be displaced parallel to each other in the horizontal direction o - o. A pair of pillow stands 2, the distance m of which can be adjusted depending on the type of test piece d, and each having test piece supporting rollers 1 and 1' on the upper surface in a direction perpendicular to the horizontal displacement direction o - o.
. 1′
The roller 4 provided on the lower surface of the load head b comes into contact with the center of the span supported by The head B is lowered toward the horizontal platform A, and the load roller 4 of the load head B repeatedly presses down the center of the upper surface of the test piece d, bending the test piece d and pushing open the mechanical notch e.
A fatigue crack occurred above the mechanical notch e for about two strokes, and when it reached the crack gauge f, a signal was received from the crack gauge f and the pressing of the load head B was stopped to obtain the desired pre-crack. However, with this conventional configuration, it takes about 1 hour per pre-crack, but the COD test takes 30 minutes per pre-crack, so C
The pre-crack introduction work is a bottleneck in the OD test, and C
This significantly reduced the efficiency of OD test work.
この発明は少くとも二本の試験片ｄに予亀裂を一時に導
入できるようにし、ＣＯＤ試験を効率的に行えるように
した疲労試験装置におけるＣＯＤ試験片への疲労予亀裂
導入用装置を提供するのをその目的とする。This invention provides a device for introducing a fatigue pre-crack into a COD test piece in a fatigue testing apparatus, which allows a pre-crack to be introduced into at least two test pieces d at the same time and allows efficient COD testing. Its purpose is to
第１番目の発明の一実施例である第５図及び第６図（第
５図の側面図）に基づいてその構成を説明すると、第１
図に点線で示した、下部に水平台盤Ａを有し、上方に昇
降ヘッドＢを備えた疲労試験装置に装着されるもので、
該水平台盤Ａ上に水平に載置される水平台ａと、該昇降
ヘッドＢに取付けられる負荷ヘッドｂと、該負荷ヘッド
ｂのＦ面に装着される横杆Ｃとよりなり、該水平台ａ上
には、試験片ｄの長さに合わせ、水平方向に互に平行に
変位できて間隔ｍを調節できるようになっており、且つ
上面に該変位方向と直交する方向に夫々試験片支持ロー
ラー１，１′を有する一双の枕台２，２′があり、該試
験片支持ローラーＬｌ’上に該ローラーに直交して２個
の試験片ｄ、ｄが載置されるようになっており、該横杆
Ｃには、該各試験片ｄ、ｄの上面中央を横切って負荷を
与えられる第２負荷ローラー３，３′を該横杆Ｃ下面の
長手方向の一直線の両端に１個づつ設け、該横杆Ｃの上
面中央には長手方向に直交して前記負荷ヘッドｂの第１
負荷ローラー４が当接されるようになっているものであ
る。The structure of the first invention will be explained based on FIGS. 5 and 6 (side view of FIG. 5), which are one embodiment of the first invention.
It is attached to a fatigue testing device shown by the dotted line in the figure, which has a horizontal platform A at the bottom and an elevating head B above.
It consists of a horizontal platform a placed horizontally on the horizontal platform A, a load head b attached to the lifting head B, and a horizontal rod C attached to the F side of the load head b. On the flat table a, the test pieces can be displaced parallel to each other in the horizontal direction according to the length of the test piece d, and the interval m can be adjusted. There is a pair of bed stands 2, 2' having support rollers 1, 1', and two test specimens d, d are placed on the test specimen support roller Ll' orthogonally to the rollers. Second load rollers 3 and 3', which are applied with a load across the center of the upper surface of each test piece d and d, are attached to the horizontal rod C at both ends of a straight line in the longitudinal direction of the lower surface of the horizontal rod C. A first load head of the load head b is provided perpendicularly to the longitudinal direction in the center of the upper surface of the horizontal rod C.
The load roller 4 is brought into contact therewith.
この実施例は叙上のような構成を有するから、昇降ヘッ
ドＢの降下により負荷ヘッドｂが降下すると、負荷ヘッ
ドｂの匝下刃は横杆Ｃで２分され横杆Ｃの第２負荷ロー
ラー３，３′により二本の試験片ｄ、ｄを押下する。Since this embodiment has the above-mentioned configuration, when the load head b descends due to the descent of the lifting head B, the lower blade of the load head b is divided into two by the horizontal rod C, and the second load roller of the horizontal rod C is divided into two parts. 3 and 3' press down the two test pieces d and d.
なお、第２負荷ローラー３．３′が試験片ｄ、ｄを押下
するところは一双の枕台２，２′上の支持ローラー１，
１′の間隔ｍの丁度中央で試験片ｄ、ｄを横切る位置に
なる。In addition, the place where the second load roller 3.3' presses down the test pieces d, d is the support roller 1, on the pair of bed stands 2, 2'.
The test pieces d and d are crossed at the exact center of the distance m of 1'.
従って二本の試験片ｄ、ｄは互に等しい圧下刃で、又互
に等しい支持条件の下に予亀裂導入作業が行われ、予亀
裂が亀裂ゲージｆに達すれば信号を発するので繰返し圧
下を停止する。Therefore, the pre-crack introduction work is performed on the two test pieces d and d with the same rolling blades and under the same support conditions, and when the pre-crack reaches the crack gauge f, a signal is emitted, so that repeated rolling is performed. Stop.
第１番目の発明は叙上のような構成作用を有するから、
負荷ヘッドｂの圧下刃により二本の試験片の予亀裂導入
作業が行われるので、従来の方法に比して２倍の能率が
得られＣＯＤ試験を適正な効率で行なえるようにする効
果を有する。Since the first invention has the above-mentioned structural effect,
Since the pre-crack introduction work of the two test specimens is performed by the rolling blade of the load head b, the efficiency is twice as high as that of the conventional method, and the effect is that the COD test can be performed with appropriate efficiency. have
次に第２番目の発明の一実施例である第４図、第７図、
第８図（第７図の側面図）に基づいてその構成を説明す
ると、第１図に点線で示した、下部に水平台盤Ａを有し
、上方に昇降ヘッドＢを備えた疲労試験装置に装着され
るもので、該水平台盤Ａ上に水平に載置される水平台ａ
と、該昇降ヘッドＢに取付けられる負荷ヘッドｂと、該
負荷ヘッドｂの下面に装着される横杆Ｃとよりなり、該
水平台ａ上には更に、水平方向Ｏ−Ｏに互に平行に変位
できて、試験片ｄの種類により間隔ｍを調節できるよう
になっており、且つ上面に該水平変位方向Ｏ−Ｏと直交
する方向に夫々試験片支持口−ラー１，１′を有する一
双の枕台２，２′があり、該試験片支持ローラー１，１
′上に該ローラーに直交して２個の試験片ｄ、ｄが載置
されるようになっており、該横杆Ｃには該横杆Ｃの下面
の長手方向の一直線を含む鉛直面Ｙ内に回動できる小塊
片ｇ、ｇ’を該横杆Ｃの両端に１個づつ垂設し、該小塊
片の下面に第２負荷ローラー３，３′を前記鉛直面Ｙ内
にあり、且つ該試験片の上面の中央に、該試験片ｄ、ｄ
に直交して当接するように設けられ、該横杆Ｃの上面中
央には該横杆Ｃの長手方向に直交して前記負荷ヘッドの
負荷ローラーが当接するようにしたも０である。Next, FIGS. 4 and 7, which are an embodiment of the second invention,
The structure will be explained based on FIG. 8 (side view of FIG. 7). The fatigue testing device has a horizontal platform A at the bottom and an elevating head B at the top, as indicated by the dotted line in FIG. 1. A horizontal table a that is mounted on the horizontal table A and is placed horizontally on the horizontal table A.
, a load head b attached to the lifting head B, and a horizontal rod C attached to the lower surface of the load head b. A pair of test piece support holes 1 and 1' which are movable and whose spacing m can be adjusted depending on the type of test piece d, and which have test piece support openings 1 and 1' on the upper surface in a direction perpendicular to the horizontal displacement direction O-O. There are pillow stands 2, 2', and the test piece supporting rollers 1, 1
' Two test pieces d and d are placed on the roller perpendicularly to the roller, and the horizontal bar C has a vertical plane Y that includes a straight line in the longitudinal direction of the lower surface of the horizontal bar C. One small piece g, g' that can be rotated inwardly is hung down at each end of the horizontal rod C, and second load rollers 3, 3' are placed on the lower surface of the small piece in the vertical plane Y. , and in the center of the upper surface of the test piece, the test piece d, d
The load roller of the load head is provided so as to be perpendicular to the longitudinal direction of the horizontal rod C and to be in contact with the center of the upper surface of the horizontal rod C.
この実施例は斜上のような構成を有するから試験片ｄ、
ｄの表面が支持台ａの表面と正しく平行でない場合でも
、第２負荷ローラー３，３′は、該ローラーは鉛直面Ｙ
の中を回動できるようになっているので正しく線接触を
行い、試験片ｄ、ｄを正しく圧下できる。Since this example has a diagonally upward configuration, the test piece d,
Even if the surface of d is not exactly parallel to the surface of support a, the second load rollers 3, 3'
Since it is designed to be able to rotate inside, it is possible to make correct line contact and correctly roll down the test pieces d and d.
第２番目の発明は斜上のような構成作用を有するから、
二本の試験片ｄに均一な圧下刃を作用させることができ
る。Since the second invention has a structural effect like an upward slope,
A uniform reduction blade can be applied to the two test pieces d.
第１図は従来の疲労試験装置におけるＣＯＤ試験片への
疲労予亀裂導入用装置の斜視図、第２図は要部の正面図
、第３図は側面図、第４図は第２番目の発明の一実施例
の斜視図、第５図は第１番目の発明の一実施例の要部の
正面図、第６図は側面図、第７図は第２番目の発明の一
実施例の要部の正面図、第８図はその側面図を夫々示し
、Ａは水平台盤、Ｂは昇降ヘッド、ａは水平台、ｂは負
荷ヘッド、Ｃは横杆、ｄは試験片、ｇｊｇ’は小塊片、
１，１′は試験片支持ローラー、２，２′は枕台、３，
３′は第２負荷ローラー、４は第１負荷ローラーを夫々
示す。Figure 1 is a perspective view of a device for introducing fatigue pre-crack into a COD test specimen in a conventional fatigue test equipment, Figure 2 is a front view of the main part, Figure 3 is a side view, and Figure 4 is a second FIG. 5 is a front view of essential parts of an embodiment of the first invention, FIG. 6 is a side view, and FIG. 7 is a perspective view of an embodiment of the second invention. A front view of the main part and a side view thereof are shown in FIG. is a small piece,
1, 1' are test piece supporting rollers, 2, 2' are pillow stands, 3,
3' indicates a second loaded roller, and 4 indicates a first loaded roller.
Claims (1)
えたＣＯＤ試験装置に装着されるもので、該水平台盤Ａ
上に水平に載置される水平台ａと、該昇降ヘッドＢに取
付けられる負荷ヘッドｂと、該負荷ヘッドｂの下面に装
着される横杆Ｃとよりなり、該水平台ａ上には更に、水
平方向に互に平行に変位できて間隔ｍを調節できるよう
になっており、且つ上面に該変位方向と直交する方向に
夫夫試験片支持ローラー１，１′を有する一双の枕台２
，２′があり、該試験片支持ローラー１，１′上に該ロ
ーラーに直交して複数個の試験片（１，ｄが載置される
ように−なっており、該横杆Ｃには、該各試験片ｄ、ｄ
の上面中央を横切って負荷を与えられる第２負荷ローラ
ー３，３′を該横杆Ｃの下面の長手方向の一直線上の両
端に１個づつ設は該横杆Ｃの上面中央には長手方向に直
交して前記負荷ヘッドｂの第１負荷ローラー４が当接さ
れるようになっていることを特徴とする疲労試験装置に
おけるＣＯＤ試験片への疲労予亀裂導入用装置１２ 下
部に水平台盤Ａを有し、上方に昇降ヘッドＢを備えた疲
労試験装置に装着されるもので、該水平台盤Ａ上に水平
に載置される水平台ａと、該昇降ヘッドＢに増付けられ
る負荷ヘッドｂと、該負荷ヘッドｂの下面に装着される
横杆Ｃとよりなり、該水平台ａ上には更に、水平方向ｏ
−ｏに互に平行に変位できて間隔ｍを調節できるよう
になっており、且つ上面に該水平変位方向○−〇と直交
する方向に夫々試験片支持ローラー１，１′を有する一
双の枕台２，２′があり、該試験片支持ローラー１，１
′上に該ローラーに直交して複数個の試験片ｄ、ｄが載
置されるようになっており、該横杆Ｃには該横杆Ｃの下
面の長手方向の一直線を含む鉛直面Ｙ内に回動できる小
塊片ｇ 、 ｇ’を該横杆Ｃの両端に１個づつ垂設し、
該小塊片ｇ ｓ ｇ’の下面に第２負荷ローラー３，３
′を前記鉛直面Ｙ内にあり、且つ試験片の上面の中央に
、該試験片ｄ、ｄに直交して当接するように設けられ、
該横杆Ｃの上面中央には該横杆の長手方向に直交して前
記負荷ヘッドの負荷ローラー４が当接するようにしたこ
とを特徴とする、疲労試験装置におけるＣＯＤ試験片へ
の疲労予亀裂導入用装置。1. It is installed in a COD test device that has a horizontal platform A at the bottom and an elevating head B at the top, and the horizontal platform A
It consists of a horizontal stand a placed horizontally on top, a load head b attached to the lifting head B, and a horizontal rod C attached to the lower surface of the load head b. , a pair of bed supports 2, which can be displaced parallel to each other in the horizontal direction to adjust the interval m, and have test piece support rollers 1 and 1' on the upper surface in a direction perpendicular to the displacement direction.
, 2', and a plurality of test specimens (1, d) are placed on the test specimen support rollers 1, 1' perpendicularly to the rollers, and the horizontal rod C has , each test piece d, d
Second load rollers 3, 3', which apply a load across the center of the upper surface, are installed at both ends of the lower surface of the horizontal rod C in a straight line in the longitudinal direction. A device 12 for introducing a fatigue pre-crack into a COD specimen in a fatigue testing apparatus, characterized in that the first load roller 4 of the load head b is brought into contact with the first load roller 4 perpendicular to the load head b. A, which is attached to a fatigue testing device equipped with an elevating head B above, and a horizontal platform a placed horizontally on the horizontal platform A, and a load added to the elevating head B. It consists of a head b and a horizontal rod C attached to the lower surface of the load head b.
- A pair of pillows that can be displaced parallel to each other to adjust the interval m, and have test specimen support rollers 1 and 1' on the upper surface in a direction orthogonal to the horizontal displacement direction ○-○, respectively. There are stands 2, 2', and the test piece supporting rollers 1, 1.
A plurality of test pieces d and d are placed on the roller perpendicularly to the roller, and the horizontal rod C has a vertical plane Y including a straight line in the longitudinal direction of the lower surface of the horizontal rod C. One small piece g, g' that can be rotated inward is hung at each end of the horizontal rod C,
The second load rollers 3, 3 are placed on the lower surface of the small piece gsg'.
' is located in the vertical plane Y and is provided at the center of the upper surface of the test piece so as to be in contact with the test pieces d and d perpendicularly,
Fatigue pre-cracking of a COD test piece in a fatigue testing apparatus, characterized in that a load roller 4 of the load head contacts the center of the upper surface of the horizontal rod C perpendicularly to the longitudinal direction of the horizontal rod. Introduction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP585180A JPS5831537B2 (en) | 1980-01-23 | 1980-01-23 | Device for introducing fatigue pre-crack into COD test piece in fatigue test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP585180A JPS5831537B2 (en) | 1980-01-23 | 1980-01-23 | Device for introducing fatigue pre-crack into COD test piece in fatigue test equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56104232A JPS56104232A (en) | 1981-08-19 |
| JPS5831537B2 true JPS5831537B2 (en) | 1983-07-06 |
Family
ID=11622491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP585180A Expired JPS5831537B2 (en) | 1980-01-23 | 1980-01-23 | Device for introducing fatigue pre-crack into COD test piece in fatigue test equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5831537B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01117633U (en) * | 1988-02-04 | 1989-08-09 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2909239A1 (en) | 2006-11-27 | 2008-05-30 | Thomson Licensing Sas | ACTIVE PASS FILTER |
-
1980
- 1980-01-23 JP JP585180A patent/JPS5831537B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01117633U (en) * | 1988-02-04 | 1989-08-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56104232A (en) | 1981-08-19 |
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