JPS58211627A - Fatigue crack inserting method - Google Patents
Fatigue crack inserting methodInfo
- Publication number
- JPS58211627A JPS58211627A JP9537682A JP9537682A JPS58211627A JP S58211627 A JPS58211627 A JP S58211627A JP 9537682 A JP9537682 A JP 9537682A JP 9537682 A JP9537682 A JP 9537682A JP S58211627 A JPS58211627 A JP S58211627A
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- ultrasonic wave
- vibration
- amplitude
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【発明の詳細な説明】 疲労き裂を挿入する方法に係わるものである。[Detailed description of the invention] This relates to the method of inserting fatigue cracks.
疲労試験前に試験片に対する疲労き裂の挿入は。Insertion of fatigue cracks into specimens before fatigue testing.
従来は，通常の疲労試験機（繰返し速度がせいぜい１０
０Ｈｚ 程度）で実施している。しかしながら、これて
は繰返し速度が遅いため疲労き裂挿人に膨大な時間及び
費用がかかっていた。Previously, ordinary fatigue testing machines (with a repetition rate of at most 10
(approximately 0Hz). However, this requires a large amount of time and cost to insert fatigue cracks due to the slow repetition rate.
本発明は，上記問題点を解決するものであり。The present invention solves the above problems.
液中に浸漬した平均応ｊＪを負荷した試験片に超「波発
振器から発生する超音波によってたて振動を継続的に生
起せしめて，上記試験片に疲労き裂を発生させ，その疲
労き裂の発生によって起る試験片の固有振動数の変化に
基づく振動。A test piece immersed in a liquid and loaded with an average stress of jJ is subjected to continuous vertical vibration using ultrasonic waves generated from an ultra-wave oscillator to generate fatigue cracks in the test piece. Vibration caused by changes in the natural frequency of the test piece caused by the occurrence of
振幅の変化を検出し，上記試験片に対する加振動作を停
止するようにしたことを特徴とし，その目的とするとこ
ろは，超音波による疲れ試験方法を応用して，１６ＫＨ
ｚという高速で疲労き裂挿入運転を実施し，任意の平均
応力を負荷した状態で，疲労き裂挿入を短時間で容易に
行なえる方法を提供するものである。It is characterized by detecting the change in amplitude and stopping the excitation operation on the test piece, and its purpose is to apply the ultrasonic fatigue test method to
This method provides a method for easily inserting fatigue cracks in a short period of time by performing fatigue crack insertion operation at a high speed of z and applying an arbitrary average stress.
以ド，本発明の方法を具現した第１図に示す一実施例の
装置により本発明を説明する。Hereinafter, the present invention will be explained using an embodiment of the apparatus shown in FIG. 1, which embodies the method of the present invention.
ｌは，超音波振動ｒ−．２は振幅拡大ホーンであって同
ポーノ２の先端に試験片３が取り付けられており超音波
発振器４の発生する超音波により試験片３はたて振動を
する。試験片３は所定の固有振動数を有しており、水溶
液を満した水溶液槽１３に挿入されている。平均応力は
振幅拡大ホーン２と同一形状の共振要素１４及びレバー
１５を介してレバー１５端に重錘１６をかけることによ
り試験片軸ＩＣ垂直に任意の静応力を負荷することによ
り与えることができる。l is the ultrasonic vibration r-. Reference numeral 2 denotes an amplitude expansion horn, and a test piece 3 is attached to the tip of the horn 2. Ultrasonic waves generated by an ultrasonic oscillator 4 cause the test piece 3 to vibrate vertically. The test piece 3 has a predetermined natural frequency and is inserted into an aqueous solution tank 13 filled with an aqueous solution. The average stress can be given by applying an arbitrary static stress perpendicular to the test specimen axis IC by applying a weight 16 to the end of the lever 15 via a resonant element 14 having the same shape as the amplitude expansion horn 2 and a lever 15. .
尚 上記発振器４には、定振幅制御回路７゜動作回数表
示器８９時間計９．を雑器１０が組みこまれている。５
は電圧計、６はインピーダンス変化検出器であって、上
記超音波発振器４０発生する超音波電流を常時検出して
おり、インピーダンスの変化がちった場合、上記定振幅
制御回路７及び時間計９を停止させ、かつ警報器１０を
作動させるようになっている。The oscillator 4 includes a constant amplitude control circuit 7, an operation count indicator 89, an hour total 9. 10 miscellaneous items are incorporated. 5
is a voltmeter, and 6 is an impedance change detector, which constantly detects the ultrasonic current generated by the ultrasonic oscillator 40. When the impedance changes, the constant amplitude control circuit 7 and the time meter 9 are activated. The vehicle is stopped and the alarm 10 is activated.
超音波発振器４から発生した超音波は、超音波振動子Ｉ
Ｋ送信され、振幅拡大ホー７２で拡大され、試験片３に
たて振動を与える。試験片３は、水溶液槽１．３に浸漬
されているが同水溶液１３と、貯液槽１１との間をボ／
ブ１２により水溶液が循環するようになっている。この
水溶液によって試験片３が所定の温度に冷却されたら疲
労き袋挿入装置を運転する。運転に先立って疲労き裂長
さに対応した検出信号値を、あらかじめ予備テストに上
って求めた疲労き裂長さと検出値（インピーダンス）と
の関係をもとに設定しておく（第２図）。運転開始後、
試験片３に所定長さの疲労き裂が発生すると該試験片３
の固有振動数に変化が生じ、たて振動の振幅が変化する
。The ultrasonic waves generated from the ultrasonic oscillator 4 are transmitted to the ultrasonic transducer I.
K is transmitted, and the amplitude is expanded by the amplitude expansion hoop 72, giving vertical vibration to the test piece 3. The test piece 3 is immersed in the aqueous solution tank 1.3, but there is no water between the aqueous solution 13 and the liquid storage tank 11.
The aqueous solution is circulated by the tube 12. When the test piece 3 is cooled to a predetermined temperature by this aqueous solution, the fatigue bag insertion device is operated. Prior to operation, the detection signal value corresponding to the fatigue crack length is set based on the relationship between the fatigue crack length and the detected value (impedance) determined in advance through preliminary tests (Figure 2). . After starting operation,
When a fatigue crack of a predetermined length occurs in the test piece 3, the test piece 3
A change occurs in the natural frequency of the vibration, and the amplitude of the vertical vibration changes.
この振幅の変化は、超音波電流のインビーダ、スの変化
として表われるので、それは上記インピーダンス変化検
出器６により検出され、この検出信号によって定振幅制
御回路７及び時間６１９を停止させ、試験片３の振動を
停止させる。This change in amplitude appears as a change in the impedance of the ultrasonic current, so it is detected by the impedance change detector 6, and this detection signal stops the constant amplitude control circuit 7 and the timer 619, and stop the vibration.
尚、それ１での試験時間は別途記録計に記録される。The test time in Part 1 is recorded separately on a recorder.
このように１本発明の方法の一実施例の装置によると試
験片３は、水溶液槽１３の液中に浸漬され固液は、循環
しているので、試験片３の温度上昇をおさえることがで
きる。又、試験片３に生じた疲労き裂を固有振動数の変
化によるたて振動振幅の変化としてとらえ、同振幅の変
化をインピーダンス変化により検出し、この検出信号を
用いて、試験片３の振動を停止させる゛ とともに２
時間計９も停止させ、かつ知らせるようにしたので、所
定長さの疲労き裂の発生に至るまでの時間と、その時の
状態をすぐに観察することが可能である。As described above, according to the apparatus of one embodiment of the method of the present invention, the test piece 3 is immersed in the liquid in the aqueous solution tank 13 and the solid liquid is circulated, so that the temperature rise of the test piece 3 can be suppressed. can. In addition, the fatigue crack that occurred in the test piece 3 is interpreted as a change in the vertical vibration amplitude due to a change in the natural frequency, the change in the same amplitude is detected by the impedance change, and this detection signal is used to detect the vibration of the test piece 3. to stop ゛ with 2
Since the time meter 9 is also stopped and notified, it is possible to immediately observe the time until a fatigue crack of a predetermined length occurs and the state at that time.
第１図は２本発明の試験方法を具現化した一実施例の装
置の概略図、第２図は、疲労き裂長さと検出信号との関
係を示したものである。１は超音波振動子、２は振幅拡
大ホーン、３は試験片、４は超音波発振器、５はモーシ
ョナル電圧検出表示器、６はモーショナルインピーダン
ス変化検出器、７は定振幅制御回路、８は動作回数表示
器、９は時間計、１０は警報器、１１は貯液槽、１２は
循環ポンプ、１３は水溶液槽。
１４は共振要素、１５はし・＜−，１６は重錘である。FIG. 1 is a schematic diagram of an embodiment of an apparatus embodying the testing method of the present invention, and FIG. 2 shows the relationship between fatigue crack length and detection signal. 1 is an ultrasonic vibrator, 2 is an amplitude expansion horn, 3 is a test piece, 4 is an ultrasonic oscillator, 5 is a motional voltage detection display, 6 is a motional impedance change detector, 7 is a constant amplitude control circuit, and 8 is a 9 is a timer, 10 is an alarm, 11 is a liquid storage tank, 12 is a circulation pump, and 13 is an aqueous solution tank. 14 is a resonant element, 15 is <-, and 16 is a weight.
Claims (1)
音波発生器から発生する超音波によって、たて振動を継
続的に生起せしめ、上記試験片に任意の長さの疲労き裂
を発生ζせ、その疲労き裂の発生によって生ずる試験片
の固有振動数の変化に基づく振動振幅の変化を検出し。 上記試験片に対する加振動作を停止するようにしたこと
を特徴とする疲労き裂挿入方法。[Claims] With an average stress applied to a test piece immersed in a liquid, ultrasonic waves generated from an ultrasonic generator are used to continuously generate vertical vibrations, so that the test piece can be made to any desired length. This method detects changes in vibration amplitude based on changes in the natural frequency of the test piece caused by the generation of fatigue cracks. A fatigue crack insertion method characterized in that the excitation operation on the test piece is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9537682A JPS58211627A (en) | 1982-06-03 | 1982-06-03 | Fatigue crack inserting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9537682A JPS58211627A (en) | 1982-06-03 | 1982-06-03 | Fatigue crack inserting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58211627A true JPS58211627A (en) | 1983-12-09 |
| JPS6239932B2 JPS6239932B2 (en) | 1987-08-26 |
Family
ID=14135918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9537682A Granted JPS58211627A (en) | 1982-06-03 | 1982-06-03 | Fatigue crack inserting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58211627A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2112780A1 (en) * | 1995-12-01 | 1998-04-01 | Consejo Superior Investigacion | Procedure and device for the non-linear characterization of solid materials. |
| JP2002286605A (en) * | 2001-03-23 | 2002-10-03 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for high strain rate fatigue test |
| KR101408099B1 (en) * | 2012-02-21 | 2014-06-17 | 주식회사 엔디디 | Ultra-high cycle fatigue testing apparatus |
| JP2014521103A (en) * | 2011-07-22 | 2014-08-25 | スネクマ | Apparatus and method for performing a high cycle material fatigue test at a controlled strain ratio in a controlled atmosphere |
| US20160047709A1 (en) * | 2014-08-14 | 2016-02-18 | Rolls-Royce Plc | Method of testing |
| EP3460465A1 (en) * | 2017-09-19 | 2019-03-27 | Shimadzu Corporation | Jig for ultrasonic fatigue testing machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51129285A (en) * | 1975-05-02 | 1976-11-10 | Nippon Steel Corp | Measurement method and apparatus for grain boundary embrittlement of s teel material |
| JPS55162152U (en) * | 1979-05-07 | 1980-11-20 |
-
1982
- 1982-06-03 JP JP9537682A patent/JPS58211627A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51129285A (en) * | 1975-05-02 | 1976-11-10 | Nippon Steel Corp | Measurement method and apparatus for grain boundary embrittlement of s teel material |
| JPS55162152U (en) * | 1979-05-07 | 1980-11-20 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2112780A1 (en) * | 1995-12-01 | 1998-04-01 | Consejo Superior Investigacion | Procedure and device for the non-linear characterization of solid materials. |
| JP2002286605A (en) * | 2001-03-23 | 2002-10-03 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for high strain rate fatigue test |
| JP2014521103A (en) * | 2011-07-22 | 2014-08-25 | スネクマ | Apparatus and method for performing a high cycle material fatigue test at a controlled strain ratio in a controlled atmosphere |
| KR101408099B1 (en) * | 2012-02-21 | 2014-06-17 | 주식회사 엔디디 | Ultra-high cycle fatigue testing apparatus |
| US20160047709A1 (en) * | 2014-08-14 | 2016-02-18 | Rolls-Royce Plc | Method of testing |
| US9880068B2 (en) * | 2014-08-14 | 2018-01-30 | Rolls-Royce Plc | Method of testing |
| EP3460465A1 (en) * | 2017-09-19 | 2019-03-27 | Shimadzu Corporation | Jig for ultrasonic fatigue testing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6239932B2 (en) | 1987-08-26 |
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