JPH0143898B2 - - Google Patents
Info
- Publication number
- JPH0143898B2 JPH0143898B2 JP7605781A JP7605781A JPH0143898B2 JP H0143898 B2 JPH0143898 B2 JP H0143898B2 JP 7605781 A JP7605781 A JP 7605781A JP 7605781 A JP7605781 A JP 7605781A JP H0143898 B2 JPH0143898 B2 JP H0143898B2
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- change
- test
- corrosion fatigue
- ultrasonic
- 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
Links
- 238000012360 testing method Methods 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 15
- 230000007797 corrosion Effects 0.000 claims description 13
- 238000005260 corrosion Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000009661 fatigue test Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【発明の詳細な説明】
本発明は種々の水溶液環境中での超音波による
腐食疲れ試験方法に係るものである。最近、使用
条件の苛酷化及び環境の多様化に伴なう高速回転
機器の腐食疲れ破損事故が工業上問題になつてい
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion fatigue testing method using ultrasonic waves in various aqueous environments. Recently, corrosion fatigue damage accidents of high-speed rotating equipment have become an industrial problem due to harsher usage conditions and diversification of environments.
ところが、通常の疲れ試験機では繰返し速度が
せいぜい100Hzと遅いため、破断繰返し数Nfがた
かだか108までしか試験できず、破損事故の多い
109以上の寿命及び時間強さを求めることは不可
能であつた。 However, because the repetition rate of ordinary fatigue testing machines is slow at 100 Hz at most, it is possible to test only up to a rupture repetition rate Nf of 10 8 at most, resulting in many breakage accidents.
It was impossible to obtain a life and time strength of 109 or more.
このような通常の疲れ試験機の欠点を改良する
ために超音波による疲れ試験方法が提案された
が、試験片の冷却手段が面倒であり試験により得
られたデータから実働条件下での疲れ挙動を検定
することが困難であつた為に工業的な実用化には
至らなかつた。 A fatigue testing method using ultrasonic waves was proposed to improve the shortcomings of conventional fatigue testing machines, but the method of cooling the specimen was cumbersome, and the data obtained from the test showed that the fatigue behavior under actual working conditions was not accurate. Because it was difficult to test the method, it was not put into practical use industrially.
本発明はこれらの欠点を補充するものであつ
て、液中に浸漬した所定の固有振動数を有する試
験片に、平均応力を負荷した状態で超音波発振回
路から発生する超音波電流によつてたて振動を継
続的に生起せしめ、上記試験片の表層に腐食疲労
き裂を発生させ、上記試験片の表層に腐食疲れき
裂が発生したことによる試験片の固有振動数の変
化に基づくたて振動の振幅の変化を検出し、上記
試験片に与えるたて振動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採用し、16KHzという高速
で腐食疲れ試験を実施し、異なる平均応力を負荷
した状態で、Nf＞109での腐食疲労寿命及び時間
強さを容易に求める方法を提供するものである。 The present invention corrects these shortcomings by applying an ultrasonic current generated from an ultrasonic oscillation circuit to a test piece having a predetermined natural frequency immersed in a liquid and applying an average stress to the test piece. Vertical vibration was continuously generated to generate corrosion fatigue cracks in the surface layer of the test piece, and the change in the natural frequency of the test piece due to the corrosion fatigue cracks occurring in the surface layer of the test piece was It is characterized by detecting changes in the amplitude of vibration and stopping the vertical vibration applied to the test piece. This provides a method to easily determine the corrosion fatigue life and time strength at Nf > 10 9 by carrying out a corrosion fatigue test and applying different average stresses.
以下、本発明の方法を具現化した第１図に示す
一実施例により本発明を説明する。 The present invention will be explained below with reference to an embodiment shown in FIG. 1 that embodies the method of the present invention.
１は超音波振動子、２は振幅拡大ホーンであつ
て、同ホーン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の発生する超音波電流に
より試験片３はたて振動をする。 1 is an ultrasonic vibrator, and 2 is an amplitude expansion horn. A test piece 3 is attached to the tip of the horn 2, and the test piece 3 is vertically vibrated by the ultrasonic current generated by the ultrasonic oscillator 4. do.
試験片３は所定の固有振動数を有しており、腐
食液を満した腐食液槽１３に挿入されている。同
液槽１３内の腐食液はポンプ１２を介して貯液槽
１１との間を循環するようになつている。 The test piece 3 has a predetermined natural frequency and is inserted into a corrosive liquid tank 13 filled with a corrosive liquid. The corrosive liquid in the liquid tank 13 is circulated between the liquid tank 11 and the liquid storage tank 11 via the pump 12.
試験片３の他端には振幅拡大ホーン２と同一形
状の共振要素１４が取り付けてありレバー１５を
介してレバー１５端に重鍾１６をかけることによ
り試験片３軸に垂直に実働条件に近い任意の静応
力を負荷することにより平均応力が与えることが
できる。 A resonant element 14 having the same shape as the amplitude expansion horn 2 is attached to the other end of the test piece 3, and by applying a heavy peg 16 to the end of the lever 15 via a lever 15, the test piece 3 is perpendicular to the 3 axes to approximate actual working conditions. The average stress can be given by applying an arbitrary static stress.
なお、上記発振器４には定振幅制御回路７、動
作回数表示器８、時計９、警報器１０が組みこま
れている。 The oscillator 4 includes a constant amplitude control circuit 7, an operation frequency display 8, a clock 9, and an alarm 10.
５は電圧計、６はインピーダンス変化検出器で
あつて、上記超音波発振器４の発生する超音波電
流を常時検出しておりインピーダンスの変化があ
つた場合、上記定振幅制御回路７および時計９を
停止させ、かつ警報器１０を作動させるようにな
つている。 5 is a voltmeter, and 6 is an impedance change detector, which constantly detects the ultrasonic current generated by the ultrasonic oscillator 4. When there is a change in impedance, the constant amplitude control circuit 7 and clock 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１に送信され、振幅拡大ホーン２で拡大さ
れ、試験片３にたて振動を与える。試験片３は腐
食液槽１３に浸漬され、貯液槽１１との間でポン
プ１２により腐食液が循環されるので、試験片３
の冷却と同時に腐食疲れ試験が可能となる。 Ultrasonic waves generated from the ultrasonic oscillator 4 are transmitted to the ultrasonic transducer 1, amplified by the amplitude amplifying horn 2, and impart vertical vibration to the test piece 3. The test piece 3 is immersed in the corrosive liquid tank 13, and the corrosive liquid is circulated between the test piece 3 and the liquid storage tank 11 by the pump 12.
Corrosion fatigue tests can be performed at the same time as cooling.
長時間の試験の後、試験片３の表層に微細な腐
食疲れ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、たて振動の振幅も変化する。この
振幅の変化によつて生ずる超音波電流のインピー
ダンスの変化は上記インピーダンス変化検知器６
により検出され、この検出信号によつて定振幅制
御回路７および時計９を停止させ、試験片３の振
動を停止させるようになつている。なお、それま
での試験時間は別途記録計に記録される。 After a long test, when fine corrosion fatigue cracks occur on the surface layer of the test piece 3, the natural frequency of the test piece 3 changes, and the amplitude of the longitudinal vibration also changes. The change in impedance of the ultrasonic current caused by this change in amplitude is detected by the impedance change detector 6.
This detection signal causes the constant amplitude control circuit 7 and the clock 9 to stop, thereby stopping the vibration of the test piece 3. The test time up to that point will be recorded separately on a recorder.
このように本発明の方法の一実施例によると、
平均応力を負荷された試験片３は腐食液槽１３の
液中に浸漬され、同液は循環しているので、試験
片３の温度の上昇をおさえることができる。 Thus, according to one embodiment of the method of the invention,
The test piece 3 loaded with the average stress is immersed in the corrosive liquid tank 13, and since the liquid is circulated, an increase in the temperature of the test piece 3 can be suppressed.
また、試験片３に生じた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、時計９も停止させかつ知らせるように
したので、き裂発生に至るまでの時間と、その時
の状態をすぐ観察することが可能となつた。 In addition, a crack that occurs in the test piece 3 is recognized as a change in vertical vibration amplitude due to a change in the natural frequency, a change in the same amplitude is detected by a change in impedance, and this detection signal is used to stop the vibration of the test piece 3. At the same time, since the clock 9 was also stopped and notified, it became possible to immediately observe the time until crack initiation and the state at that time.
なお、上記実施例では超音波発振器４と超音波
振動子１を結ぶ回路のインピーダンスの変化を検
出して定振幅制御回路７の作動と時計９を停止せ
しめる例について説明したが、本発明はこの様な
実施例に限らず、試験片３の微細な腐食疲労き裂
発生に伴う振動振幅の物理的変化を検知して試験
片のたて振動を計時を中止せしめるものであれば
その手段を選ばない。 In the above embodiment, an example was described in which a change in the impedance of the circuit connecting the ultrasonic oscillator 4 and the ultrasonic transducer 1 is detected to stop the operation of the constant amplitude control circuit 7 and the clock 9. Regardless of the specific embodiments, any method can be selected as long as it detects a physical change in the vibration amplitude due to the occurrence of a minute corrosion fatigue crack in the test piece 3 and stops the time measurement of the vertical vibration of the test piece. do not have.
また、平均応力を負荷するに当つても、上記実
施例のようなレバー１５と重鍾１６によるものに
限らず、所定の応力が負荷することのできるもの
であればその手段を選ばない。 Further, in applying the average stress, the method is not limited to the lever 15 and the heavy tread 16 as in the above embodiment, but any means that can apply a predetermined stress can be used.
第１図は本発明を具現化した一実施例の装置の
概略図である。
１：超音波振動子、２：振幅拡大ホーン、３：
試験片、４：超音波発振器、５：モーシヨナル電
圧検出表示器、６：モーシヨナル・インピーダン
ス変化検出器、７：定振幅制御回路、８：動作回
数表示器、９：時間計、１０：警報器、１１：貯
液槽、１２：循環ポンプ、１３：腐食液槽、１
４：共振要素、１５：レバー、１６：重鍾。
FIG. 1 is a schematic diagram of an embodiment of an apparatus embodying the present invention. 1: Ultrasonic transducer, 2: Amplitude expansion horn, 3:
Test piece, 4: Ultrasonic oscillator, 5: Motional voltage detection display, 6: Motional impedance change detector, 7: Constant amplitude control circuit, 8: Operation frequency display, 9: Hour meter, 10: Alarm, 11: Liquid storage tank, 12: Circulation pump, 13: Corrosion liquid tank, 1
4: Resonant element, 15: Lever, 16: Heavy peg.
Claims (1)
験片に、平均応力を負荷した状態で、超音波発振
回路から発生する超音波電流によつてたて振動を
継続的に生起せしめ、上記試験片の表層に腐食疲
れき裂を発生させ、上記試験片の表層に腐食疲れ
き裂が発生したことによる該試験片の固有振動数
の変化に基づくたて振動の振幅の変化を検出し、
上記試験片に与えるたて振動を停止するようにし
たことを特徴とする長寿命腐食疲れ試験方法。1. A test piece with a predetermined natural frequency immersed in a liquid was subjected to an average stress, and vertical vibration was continuously caused by an ultrasonic current generated from an ultrasonic oscillation circuit, and the above test was carried out. generating a corrosion fatigue crack in the surface layer of the test piece, detecting a change in the amplitude of vertical vibration based on a change in the natural frequency of the test piece due to the occurrence of a corrosion fatigue crack in the surface layer of the test piece,
A long-life corrosion fatigue test method characterized in that vertical vibration applied to the test piece is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7605781A JPS57190250A (en) | 1981-05-20 | 1981-05-20 | Testing method for long life, corrosion, and fatigue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7605781A JPS57190250A (en) | 1981-05-20 | 1981-05-20 | Testing method for long life, corrosion, and fatigue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57190250A JPS57190250A (en) | 1982-11-22 |
| JPH0143898B2 true JPH0143898B2 (en) | 1989-09-25 |
Family
ID=13594139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7605781A Granted JPS57190250A (en) | 1981-05-20 | 1981-05-20 | Testing method for long life, corrosion, and fatigue |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57190250A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975740B (en) * | 2010-08-27 | 2012-08-08 | 华南理工大学 | Medical magnesium alloy biodegradability in-vitro dynamic simulation test equipment |
| CN101968478B (en) * | 2010-08-27 | 2013-02-13 | 华南理工大学 | Equipment for dynamically simulating and testing biodegradability of medical magnesium alloy in vitro |
| CN101975738B (en) * | 2010-08-27 | 2012-08-08 | 华南理工大学 | In-vitro dynamic simulation test apparatus for biodegradation performance of magnesium alloy medical equipment |
| WO2012057932A1 (en) * | 2010-10-27 | 2012-05-03 | Chevron U.S.A. Inc. | Testing device for stress corrosion cracking |
| US8302485B2 (en) | 2010-10-28 | 2012-11-06 | Chevron U.S.A. Inc. | Testing device for stress corrosion cracking |
| US8375803B2 (en) | 2010-10-27 | 2013-02-19 | Chevron U.S.A. Inc. | Testing device for stress corrosion cracking |
| JP5856296B2 (en) * | 2011-07-22 | 2016-02-09 | スネクマ | Apparatus and method for performing a high cycle material fatigue test at a controlled strain ratio in a controlled atmosphere |
| CN105784515A (en) * | 2015-12-08 | 2016-07-20 | 四川大学 | Vacuum ultrasonic vibration fatigue experimental system |
-
1981
- 1981-05-20 JP JP7605781A patent/JPS57190250A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57190250A (en) | 1982-11-22 |
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