JPH0154651B2 - - Google Patents
Info
- Publication number
- JPH0154651B2 JPH0154651B2 JP58195166A JP19516683A JPH0154651B2 JP H0154651 B2 JPH0154651 B2 JP H0154651B2 JP 58195166 A JP58195166 A JP 58195166A JP 19516683 A JP19516683 A JP 19516683A JP H0154651 B2 JPH0154651 B2 JP H0154651B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- test piece
- chuck
- testing machine
- value
- 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 32
- 238000009661 fatigue test Methods 0.000 claims description 21
- 230000007246 mechanism Effects 0.000 claims description 15
- 230000001133 acceleration Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Landscapes
- 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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【発明の詳細な説明】
この発明は材料の疲労強さを測定する材料疲労
試験機に係り、特に正確な繰り返し荷重を試験片
に加えることのできる材料疲労試験機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material fatigue testing machine for measuring the fatigue strength of a material, and more particularly to a material fatigue testing machine that can apply accurate repeated loads to a test piece.
材料の疲労強さは、試験片に繰り返し荷重を加
えて測定される。ここでこの繰り返し荷重は材料
疲労試験機を用いて試験片に加えられるが、従来
この材料疲労試験機としては、第１図に示すよう
なものが使用されている。この材料疲労試験機
は、試験片１の両側を第１のチヤツク２及び第２
のチヤツク３で把持し、第１のチヤツク２と試験
機本体６との間に荷重制御手段としてのサーボ弁
４により制御され試験片に予め定められた荷重を
加える荷重負荷機構としての油圧アクチユエータ
５を設けて試験片１の疲労試験を行なう一方、第
２のチヤツク３と試験機本体６との間に荷重検出
器７としてロードセルを設け試験片１に加えられ
る荷重を電気信号として検出してサーボ弁４に端
子８から入力される駆動信号と共にフイードバツ
クして油圧アクチユエータ５を制御駆動するもの
である。なお、図中９は荷重信号アンプ、１０は
サーボアンプ、１１は油圧ポンプユニツト、１２
は防振装置を示す。 The fatigue strength of a material is measured by applying repeated loads to a test piece. Here, this repeated load is applied to the test piece using a material fatigue testing machine, and conventionally, the material fatigue testing machine shown in FIG. 1 has been used. This material fatigue testing machine has a first chuck 2 and a second chuck on both sides of a test piece 1.
A hydraulic actuator 5 as a load-loading mechanism that applies a predetermined load to the test piece, controlled by a servo valve 4 as a load control means, between the first chuck 2 and the testing machine main body 6. A load cell is installed as a load detector 7 between the second chuck 3 and the testing machine main body 6 to detect the load applied to the test piece 1 as an electrical signal and send it to the servo. It controls and drives the hydraulic actuator 5 by feeding back the drive signal inputted to the valve 4 from the terminal 8. In the figure, 9 is a load signal amplifier, 10 is a servo amplifier, 11 is a hydraulic pump unit, and 12 is a
indicates a vibration isolator.
しかしながら、この種の従来の材料疲労試験機
にあつては、実際に試験片に加えられている荷重
Ｆと荷重検出器７で検出される荷重Ｆとが一致せ
ず疲労試験を正確に行なえないという不具合があ
つた。 However, in this type of conventional material fatigue testing machine, the load F actually applied to the test piece and the load F detected by the load detector 7 do not match, making it impossible to perform a fatigue test accurately. There was a problem.
これは、この材料試験機の振動系は、第２図に
示すようにモデル化した場合において、試験片に
加えられる荷重をＦ＝Fo sin wtとすると、運動
方程式は、
m1ｘ¨1＋K1（x1−x2） ＝Fo sin wt …(1)
m2ｘ¨2＋K1（x2−x1） ＋K2（x2−x3）＝０ …(2)
m3ｘ¨3＋K2（x3−x2） ＝−Fo sin wt …(3)
となる。ここで、m1，m2，m3は夫々油圧アクチ
ユエータのピストンと第１のチヤツク、第２のチ
ヤツクと荷重検出器の可動部、試験機本体と油圧
アクチユエータ本体の質量を、x1，x2，x3はm1，
m2，m3の重心の変位を、k1，k2は試験片、荷動
検出器のバネ定数を示す。 This is because the vibration system of this material testing machine is modeled as shown in Figure 2, and if the load applied to the test piece is F = Fo sin wt, then the equation of motion is m 1 x¨ 1 +K 1 (x 1 −x 2 ) =Fo sin wt …(1) m 2 x¨ 2 +K 1 (x 2 −x 1 ) +K 2 (x 2 −x 3 )=0 …(2) m 3 x ¨ 3 +K 2 (x 3 −x 2 ) = −Fo sin wt …(3). Here, m 1 , m 2 , m 3 are the masses of the piston and first chuck of the hydraulic actuator, the second chuck and the movable parts of the load detector, the test machine body and the hydraulic actuator body, respectively, and x 1 , x 2 , x 3 is m 1 ,
m 2 and m 3 represent the displacement of the center of gravity, and k 1 and k 2 represent the spring constants of the test piece and load detector.
ここで、試験片に加えられている力は、
F1＝K1（x1−x2） …(4)
と表わされ、また荷重検出器に加わる力は、
F2＝K2（x2−x3） …(5)
となり、(4)，(5)式を上記(2)式に代入すると
F1−F2＝m2ｘ¨2 …(6)
となり、試験片１に加わつた力と荷重検出器７に
加わつた力とは異なつており、荷重検出器７で検
出される値は試験片１に加わる力の値とは異なる
こととなる。 Here, the force applied to the test piece is expressed as F 1 = K 1 (x 1 − x 2 )...(4), and the force applied to the load detector is F 2 = K 2 (x 2 −x 3 ) ...(5), and by substituting equations (4) and (5) into equation (2) above, we get F 1 −F 2 = m 2 x¨ 2 ...(6), which is added to test piece 1. The force applied to the test piece 1 is different from the force applied to the load detector 7, and the value detected by the load detector 7 is different from the value of the force applied to the test piece 1.
この発明は以上の不具合に鑑みなされたもので
あつて、正確な繰り返し荷重を試験片にかけるこ
とができる材料疲労試験機を提供することを目的
とする。 The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a material fatigue testing machine that can apply accurate repeated loads to a test piece.
そしてこの目的は、試験片の両側を２つのチヤ
ツクで把持して、一方のチヤツクに荷重検出器を
設け、他方のチヤツクに荷重制御手段により制御
される荷重負荷機構を設け、荷重検出器で検出し
た荷重の値を荷重制御手段にフイードバツクして
荷重負荷機構を制御し、上記試験片に繰り返し荷
重を加えるようにした材料疲労試験機において、
上記荷重検出器側のチヤツクに加速度検出機構を
設けると共に、この検出値に基づいて上記荷重検
出器で検出した荷重の値を補正する補正手段を設
けた材料疲労試験機で達成される。 The purpose of this is to grip both sides of the test piece with two chucks, provide a load detector on one chuck, and provide a load loading mechanism controlled by a load control means on the other chuck, and detect it with the load detector. In the material fatigue testing machine, the load value is fed back to the load control means to control the load loading mechanism, and the load is repeatedly applied to the test piece.
This is achieved by using a material fatigue testing machine which is provided with an acceleration detection mechanism on the chuck on the load detector side and also with a correction means for correcting the value of the load detected by the load detector based on the detected value.
次に本発明の実施例を図面に基づいて詳細に説
明する。 Next, embodiments of the present invention will be described in detail based on the drawings.
本実施例に係る材料疲労試験機の機構は前述し
た従来の材料疲労試験機と略同一である。即ち試
験片の両側を第１及び第２のチヤツク２，３で把
持し、この第１のチヤツク２と試験機本体６との
間に荷重制御手段としてのサーボ弁４により制御
され試験片に予め定められた荷重を加える荷重負
荷機構としての油圧アクチユエータ５を設けて試
験片１の疲労試験を行なう一方、第２のチヤツク
３と試験機本体６との間に荷重検出器７としてロ
ードセルを設け荷重を電気信号として検出する。
また第２のチヤツク３には加速度検出機構として
加速度計１３を設けて、第２のチヤツク３と荷重
検出器７の可動部分の加速度ｘ¨2を検出するよう
にしている。更に、荷重制御手段としてのサーボ
弁４に補正手段しての演算器１４及び補正演算器
１５を設けている。そして加速度計１３で検出さ
れた信号は演算器１４に入力されて補正値が演算
され、荷重信号アンプ９を経た荷重検出器７の信
号と共に補正演算器１５に加えられ、この出力は
駆動信号と共にサーボアンプ１０に入力されサー
ボ弁４へ出力されるものである。 The mechanism of the material fatigue testing machine according to this embodiment is substantially the same as the conventional material fatigue testing machine described above. That is, both sides of the test piece are gripped by the first and second chucks 2 and 3, and a servo valve 4 as a load control means is used to control the space between the first chuck 2 and the testing machine main body 6, and the test piece is pre-loaded. A hydraulic actuator 5 is provided as a load loading mechanism to apply a predetermined load to perform a fatigue test on the test piece 1, while a load cell is provided as a load detector 7 between the second chuck 3 and the testing machine body 6 to detect the load. is detected as an electrical signal.
Further, the second chuck 3 is provided with an accelerometer 13 as an acceleration detection mechanism to detect the acceleration x 2 of the movable parts of the second chuck 3 and the load detector 7. Furthermore, the servo valve 4 as a load control means is provided with an arithmetic unit 14 and a correction arithmetic unit 15 as correction means. The signal detected by the accelerometer 13 is input to the calculator 14 to calculate a correction value, and is added to the correction calculator 15 together with the signal from the load detector 7 which has passed through the load signal amplifier 9, and this output is output together with the drive signal. It is input to the servo amplifier 10 and output to the servo valve 4.
次に本実施例に係る材料疲労試験機の作用につ
いて説明する。 Next, the operation of the material fatigue testing machine according to this embodiment will be explained.
材料疲労試験機が作動を開始すると、試験片に
予め定められた荷重Ｆ＝Fo sin wtが加えられる
ように、油圧アクチユエータ５がサーボ弁４に制
御されて作動する。ここでサーボ弁に現在加えら
れている荷重の真の値F1をフイードバツクして
油圧アクチユエータ５に所定の作動を行なわせる
ものであるが、本実施例においては、この真の荷
重の値として荷重検出器７が測定した荷重の値
F2に、第２のチヤツク３及び荷重検出器７の可
動部分の質量m2とこの第２のチヤツクに設けた
加速度計で測定したこれらの加速度の値αの積即
ちm2αの値を加えた値を用いるようにしている。
これは、上述のように試験片に加えられている荷
重の真の値をF1、第２チヤツク及び荷重検出器
の可動部分の質量をm2及びこれらの加速度をｘ¨2
とすると
F1−F2＝m2ｘ¨2
の式が成立し、F1は、
F1＝F2＋m2ｘ¨＝F2＋m2α
と表わせるからである。 When the material fatigue testing machine starts operating, the hydraulic actuator 5 is operated under the control of the servo valve 4 so that a predetermined load F=Fo sin wt is applied to the test piece. Here, the true value F1 of the load currently applied to the servo valve is fed back to cause the hydraulic actuator 5 to perform a predetermined operation. Load value measured by detector 7
F 2 is the product of the mass m 2 of the movable parts of the second chuck 3 and the load detector 7 and the acceleration value α measured by the accelerometer installed in this second chuck, that is, the value of m 2 α. The added value is used.
This means that, as mentioned above, the true value of the load being applied to the specimen is F 1 , the mass of the moving parts of the second chuck and load detector is m 2 , and their acceleration is x ¨ 2
This is because the formula F 1 −F 2 =m 2 x¨ 2 holds true, and F 1 can be expressed as F 1 =F 2 +m 2 x¨=F 2 +m 2 α.
m2αの値は加速度計１３に接続された演算器１
４で算出されるものであるが、上記第２のチヤツ
ク３及び荷重検出器７の可動部分の質量m2は予
め測定してこの演算器１４に設定されており、こ
の演算器からの信号m2αが荷重信号アンプ９を経
た荷重測定値F2と共に補正演算器１５に入力さ
れる。この補正演算器１５からは、試験片に加え
られている荷重の値F1に基づいて所要の補正信
号が出力されて駆動信号と共にサーボアンプを経
てサーボ弁４に加えられ、油圧アクチユエータ５
を制御して予め定めた値例えばＦ＝Fo sin wtの
荷重を試験片に加えるものである。 The value of m 2 α is determined by the calculator 1 connected to the accelerometer 13.
4, the mass m2 of the movable parts of the second chuck 3 and the load detector 7 is measured in advance and set in this calculator 14, and the signal m2 from this calculator is 2 α is input to the correction calculator 15 together with the load measurement value F 2 that has passed through the load signal amplifier 9. This correction calculator 15 outputs a required correction signal based on the value F 1 of the load applied to the test piece, and applies it to the servo valve 4 together with the drive signal via the servo amplifier, and then the hydraulic actuator 5
A load of a predetermined value, for example, F = Fo sin wt, is applied to the test piece by controlling.
なお、本実施例においては、加速度検出機構と
して加速度計を用いたが他の機構、例えば速度や
変位を測定してこの値から加速度を測定するもの
であつてもよい。 In this embodiment, an accelerometer is used as the acceleration detection mechanism, but other mechanisms such as those that measure velocity or displacement and measure acceleration from these values may also be used.
以上説明したように本発明に係る材料疲労試験
機は、荷重検出器で検出した荷重の値を補正手段
で補正して、この補正した値を荷重制御手段にフ
イードバツクし、この補正した値に基づいて荷重
制御手段が荷重負荷機構を制御できるので、試験
片に予め設定した荷重を繰り返し正しく負荷出来
るという効果を奏するものである。 As explained above, the material fatigue testing machine according to the present invention corrects the load value detected by the load detector using the correction means, feeds back this corrected value to the load control means, and performs a test based on the corrected value. Since the load control means can control the load application mechanism, it is possible to repeatedly and correctly apply a preset load to the test piece.
第１図は従来の材料疲労試験機を示す説明図、
第２図は材料疲労試験機の振動系を示すモデル
図、第３図は本発明の実施例に係る材料疲労試験
機を示す説明図である。
１……試験片、２，３……チヤツク、４……荷
重制御手段（サーボ弁）、５……荷重付加機構
（油圧アクチユエータ）、７……荷重検出器（ロー
ドセル）、１３……加速度検出機構（加速度計）、
１５……補正手段（補正演算器）。
Figure 1 is an explanatory diagram showing a conventional material fatigue testing machine.
FIG. 2 is a model diagram showing a vibration system of a material fatigue testing machine, and FIG. 3 is an explanatory diagram showing a material fatigue testing machine according to an embodiment of the present invention. 1... Test piece, 2, 3... Chuck, 4... Load control means (servo valve), 5... Load addition mechanism (hydraulic actuator), 7... Load detector (load cell), 13... Acceleration detection mechanism (accelerometer),
15... Correction means (correction calculator).
Claims (1)
一方のチヤツクに荷重検出器を設け、他方のチヤ
ツクに荷重制御手段により制御される荷重負荷機
構を設け、荷重検出器で検出した荷重の値を荷重
制御手段にフイードバツクして荷重負荷機構を制
御し、上記試験片に繰り返し荷重を加えるように
した材料疲労試験機において、上記荷重検出器側
のチヤツクに加速度検出機構を設けると共に、こ
の検出値に基づいて上記荷重検出器で検出した荷
重の値を補正する補正手段を設けたことを特徴と
する材料疲労試験機。1. Grip both sides of the test piece with two chucks,
One chuck is provided with a load detector, the other chuck is provided with a load loading mechanism controlled by a load control means, and the load value detected by the load detector is fed back to the load control means to control the load loading mechanism. In the material fatigue testing machine which repeatedly applies a load to the test piece, an acceleration detection mechanism is provided on the chuck on the load detector side, and the value of the load detected by the load detector is determined based on this detected value. A material fatigue testing machine characterized by being provided with a correction means for correction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19516683A JPS6088348A (en) | 1983-10-20 | 1983-10-20 | Material fatigue tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19516683A JPS6088348A (en) | 1983-10-20 | 1983-10-20 | Material fatigue tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6088348A JPS6088348A (en) | 1985-05-18 |
| JPH0154651B2 true JPH0154651B2 (en) | 1989-11-20 |
Family
ID=16336526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19516683A Granted JPS6088348A (en) | 1983-10-20 | 1983-10-20 | Material fatigue tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6088348A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016535250A (en) * | 2013-10-09 | 2016-11-10 | フレニ・ブレンボ エス・ピー・エー | Apparatus and method characterized by elastic properties of friction material |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2638945B2 (en) * | 1988-06-30 | 1997-08-06 | 株式会社島津製作所 | Material testing machine |
| JP4984887B2 (en) * | 2006-12-28 | 2012-07-25 | 独立行政法人 宇宙航空研究開発機構 | Multi-force measurement method and apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5146428A (en) * | 1974-10-18 | 1976-04-20 | Diamond Electric Mfg | NENSHOSEIGYO SOCHI |
-
1983
- 1983-10-20 JP JP19516683A patent/JPS6088348A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5146428A (en) * | 1974-10-18 | 1976-04-20 | Diamond Electric Mfg | NENSHOSEIGYO SOCHI |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016535250A (en) * | 2013-10-09 | 2016-11-10 | フレニ・ブレンボ エス・ピー・エー | Apparatus and method characterized by elastic properties of friction material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6088348A (en) | 1985-05-18 |
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