JPH09138190A - Fatigue testing device - Google Patents
Fatigue testing deviceInfo
- Publication number
- JPH09138190A JPH09138190A JP29839595A JP29839595A JPH09138190A JP H09138190 A JPH09138190 A JP H09138190A JP 29839595 A JP29839595 A JP 29839595A JP 29839595 A JP29839595 A JP 29839595A JP H09138190 A JPH09138190 A JP H09138190A
- Authority
- JP
- Japan
- Prior art keywords
- liquid layer
- signal
- strain gauge
- distortion
- displacement
- 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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、極低温、特に液体
窒素中（−１９６℃）での材料強度特性を得るために使
用する材料強度試験装置及び疲労試験装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material strength test apparatus and a fatigue test apparatus used for obtaining material strength characteristics at extremely low temperatures, particularly in liquid nitrogen (-196 ° C.).
【０００２】[0002]
【従来の技術】従来の一般的な疲労試験装置は、図８に
示すようにロードフレーム２１にアクチュエータと呼ば
れる負荷装置２２が装着され、供試素材に引張り又は圧
縮の力を与えるものである。2. Description of the Related Art In a conventional general fatigue test apparatus, a load device 22 called an actuator is mounted on a load frame 21 as shown in FIG. 8 to apply a tensile or compressive force to a test material.
【０００３】供試素材に用いる力は、ロードセル２３に
よって検出され、荷重の信号となる。又負荷装置の移動
はストローク検出計２４で１つの信号として得られる。
さらに、図８には図示していないが、供試素材のひずみ
を検出する変位計が有り、ひずみの信号が得られるよう
に構成されている。The force used for the test material is detected by the load cell 23 and becomes a load signal. The movement of the load device is obtained as one signal by the stroke detector 24.
Further, although not shown in FIG. 8, there is a displacement meter for detecting the strain of the sample material, which is configured to obtain a strain signal.
【０００４】それらの信号は、制御装置２５に入力さ
れ、通常の試験は上記３者（荷重・ひずみ・ストロー
ク）の信号の内１つの信号のみをフィードバック信号と
して負荷装置２２のサーボバルブ２６に出力することに
より制御されるものである。These signals are input to the control device 25, and in a normal test, only one of the three signals (load, strain, stroke) is output as a feedback signal to the servo valve 26 of the load device 22. It is controlled by
【０００５】[0005]
【発明が解決しようとする課題】従来の試験装置で液体
窒素中の極低温下で試験を実施しようとした場合には、
図８に示すように供試素材部に液層を装着し実施してい
た。しかし、従来の手段では、 １）液層内の液体窒素は蒸発量が激しく、液補充等では
−１９６℃の極低温を安定して保持するのは困難であっ
た。 ２）液体窒素中等の極低温下で使用可能な変位計が無い
ために、荷重又はストロークの制御での試験しかできな
かった。 ３） そのために、極低温下でのひずみ制御による長期
連続試験を可能とならしめるためには、以下の課題の解
決が必要となる。When an attempt is made to carry out a test in a conventional test apparatus in liquid nitrogen at an extremely low temperature,
As shown in FIG. 8, a liquid layer was attached to the material under test to carry out. However, according to the conventional means, 1) the liquid nitrogen in the liquid layer has a large amount of evaporation, and it has been difficult to stably maintain the extremely low temperature of -196 ° C by liquid replenishment or the like. 2) Since there is no displacement gauge that can be used in cryogenic temperatures such as in liquid nitrogen, only tests with load or stroke control were possible. 3) Therefore, in order to enable a long-term continuous test by controlling strain under cryogenic temperature, the following problems must be solved.
【０００６】（Ａ）流体窒素が封入された液層内が、常
に安定した−１９６℃の極低温下に保持されなければな
らない。 （Ｂ）かつ、極低温下にさらされている供試素材のひず
みを検出することが可能な変位計を、確保できなければ
ならない。という問題がある。 本発明はこれらの問題を解決することができる装置を提
供することを目的とする。(A) The inside of the liquid layer in which the fluid nitrogen is enclosed must be maintained at a stable and extremely low temperature of -196 ° C. (B) It must be possible to secure a displacement meter capable of detecting the strain of the material under test exposed to cryogenic temperatures. There is a problem. An object of the present invention is to provide a device that can solve these problems.
【０００７】[0007]
（第１の手段）本発明に係る疲労試験装置は、供試素材
に外的負荷力を与えることにより、供試素材の耐えうる
力や疲労強度等の物理定数を得る材料試験装置におい
て、（Ａ）ロードフレームに装着した負荷装置と、
（Ｂ）供試素材に作用する力を検出するロードセルと、
（Ｃ）前記負荷装置の移動量を検出するストローク検出
計と、（Ｄ）前記供試素材を冷却する断熱液層部と、
（Ｅ）前記供試素材に自抱装着した第１変位ひずみ計
と、（Ｆ）前記断熱液層部の外に装着した第２変位ひず
み計と、（Ｇ）前記断熱液層部に液体窒素を安定供給す
る手段と、（Ｈ）前記ロードセルからの信号と、ストロ
ーク検出計からの信号と、第１変位ひずみ計からの信号
とと、第２変位ひずみ計からの信号を入力し、前記負荷
装置のサーボバルブにフィードバック信号を出力する制
御装置から成り、（Ｉ）前記断熱液層部は、硬質断熱材
を金属薄板で全面被覆した構造にし、（Ｊ）前記断熱液
層部に液体窒素を安定供給する手段は、液体窒素タンク
と、流入管と、バルブと、温度センサからの信号を入力
しバルブに制御信号を出力するバルブ開閉制御器からな
ることを特徴とする。 （第２の手段）本発明に係る疲労試験装置は、第１の手
段において、（Ａ）供試素材に自抱装着した第１変位ひ
ずみ計は、断熱液層部内の極低温状態における供試素材
の直接のひずみを検出して、検出信号を制御装置に出力
し、（Ｂ）断熱液層部の外に装着した第２変位ひずみ計
は、フィードバック制御用のひずみを検出して、検出信
号を制御装置に出力することを特徴とする。(First Means) A fatigue test apparatus according to the present invention is a material test apparatus for obtaining a physical constant such as a force that a test material can withstand and a fatigue strength by applying an external load force to the test material, A) A load device attached to the load frame,
(B) A load cell that detects the force acting on the sample material,
(C) A stroke detector for detecting the amount of movement of the load device, and (D) an adiabatic liquid layer portion for cooling the sample material,
(E) A first displacement strain gauge self-embracingly attached to the sample material, (F) a second displacement strain gauge attached outside the adiabatic liquid layer portion, and (G) liquid nitrogen in the adiabatic liquid layer portion. (H) A signal from the load cell, a signal from the stroke detector, a signal from the first displacement strain gauge, and a signal from the second displacement strain gauge are input, and the load is The device comprises a control device for outputting a feedback signal to a servo valve of the device. (I) The adiabatic liquid layer part has a structure in which a hard insulating material is entirely covered with a thin metal plate, and (J) a liquid nitrogen is applied to the adiabatic liquid layer part. The stable supply means comprises a liquid nitrogen tank, an inflow pipe, a valve, and a valve opening / closing controller that inputs a signal from a temperature sensor and outputs a control signal to the valve. (Second Means) In the fatigue testing apparatus according to the present invention, in the first means, (A) the first displacement strain gauge self-embracingly mounted on the test material is used in the cryogenic state in the adiabatic liquid layer section. The direct strain of the material is detected and a detection signal is output to the control device. (B) The second displacement strain gauge mounted outside the adiabatic liquid layer section detects the strain for feedback control and the detection signal Is output to the control device.
【０００８】従って、次のように作用する。 （１）図２に示す流入管７から注入される液体窒素６ａ
が液層内に充満され、温度センサ３より液面水位が高く
なり、温度センサが水没状況となれば、温度センサ３
は、−１９６℃を検出し、バルブ開閉制御器４を介して
バルブ５を絞り、液体窒素流入量を制御する。[0008] Accordingly, the operation is as follows. (1) Liquid nitrogen 6a injected from the inflow pipe 7 shown in FIG.
Is filled in the liquid layer, the liquid surface water level becomes higher than the temperature sensor 3, and if the temperature sensor is submerged, the temperature sensor 3
Detects −196 ° C. and throttles the valve 5 via the valve opening / closing controller 4 to control the inflow amount of liquid nitrogen.
【０００９】次に、温度センサ３よりも水位が低くな
り、温度センサ３が非水没状況となれば、温度センサ３
は、−１９６℃以上を検出し、バルブ開閉制御器４を介
してバルブを開き、液体窒素流入量を増加させる。Next, if the water level becomes lower than that of the temperature sensor 3 and the temperature sensor 3 is in a non-submerged state, the temperature sensor 3
Detects −196 ° C. or higher, opens the valve via the valve opening / closing controller 4, and increases the liquid nitrogen inflow amount.
【００１０】この繰返しによって液体窒素の水位は常に
温度センサ近傍にあり、供試素材中央部１ａは、完全に
液中となり、−１９６℃で安定した状態となる。 （２）第１の変位ひずみ計８と、第２変位ひずみ計９に
より、供試素材１のひずみεの範囲を制御するのは、図
５に示すように、基本的には、液層外に設置した第２変
位ひずみ計９の出力であるひずみε２を制御するが、供
試素材のひずみ出力である第１変位ひずみ計８の出力で
あるひずみε１のピーク値を検出し、ひずみε２の制御
波形を反転させる。この作用により、供試素材のひずみ
範囲が制御されたことになる。By repeating this process, the water level of liquid nitrogen is always in the vicinity of the temperature sensor, and the central portion 1a of the test material is completely submerged in liquid and is stable at -196 ° C. (2) The range of the strain ε of the sample material 1 is controlled by the first displacement strain gauge 8 and the second displacement strain gauge 9 basically as shown in FIG. The strain ε2, which is the output of the second displacement strain gauge 9 installed at, is controlled, but the peak value of the strain ε1 that is the output of the first displacement strain gauge 8 that is the strain output of the test material is detected, and the strain ε2 Invert the control waveform. This action controls the strain range of the test material.
【００１１】[0011]
【発明の実施の形態】本発明装置の実施の形態を図１〜
図７に示す。図１は、本発明装置の全体構成図である。
供試素材１を金属薄板で被覆された断熱液層部２内に装
着し、温度センサ３によりバルブ開閉制御器４を介して
バルブ５の調整でタンク６の液体窒素を断熱液層部２に
流入管７で流入させる構成とするとともに、供試素材１
に自抱装着する第１変位ひずみ計８と断熱液層外に装着
する第２変位ひずみ計９で構成する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the device of the present invention is shown in FIGS.
As shown in FIG. FIG. 1 is an overall configuration diagram of the device of the present invention.
The test material 1 is mounted in the heat insulating liquid layer portion 2 covered with a thin metal plate, and liquid nitrogen in the tank 6 is adjusted to the heat insulating liquid layer portion 2 by adjusting the valve 5 via the valve opening / closing controller 4 by the temperature sensor 3. The material to be inspected 1
It comprises a first displacement strain gauge 8 which is attached to the body by itself and a second displacement strain gauge 9 which is attached outside the adiabatic liquid layer.
【００１２】図２は、断熱液層部２の断面拡大図であ
る。液層本体は、硬質断熱材２ａと金属薄板２ｂで全面
被覆し、断熱保温と防水の機能を高めた構造にする。FIG. 2 is an enlarged cross-sectional view of the heat insulating liquid layer section 2. The liquid layer body is entirely covered with a hard heat insulating material 2a and a thin metal plate 2b to have a structure with improved heat insulating and heat retaining functions.
【００１３】断熱液層部２は、シールパッキン１０を介
して供試素材１に装着固定する。さらに、断熱液層部２
には、流入管７、温度センサ３、及び排気口１１を装着
する。The adiabatic liquid layer portion 2 is attached and fixed to the test material 1 through the seal packing 10. Furthermore, the adiabatic liquid layer section 2
The inflow pipe 7, the temperature sensor 3, and the exhaust port 11 are attached to the.
【００１４】又、供試素材１に自抱装着した第１変位ひ
ずみ計８の計測リード線８ｘは液層外へ配出する。図３
は、供試素材１に自抱装着した第１変位ひずみ計８の構
造図である。Further, the measurement lead wire 8x of the first displacement strain gauge 8 which is attached to the sample material 1 by itself is dispensed outside the liquid layer. FIG.
[Fig. 3] is a structural diagram of a first displacement strain gauge 8 self-embracingly attached to a test material 1.
【００１５】第１変位ひずみ計８は、供試素材１に自抱
装着するために軽量小型、かつシンプルな構造とする。
第１変位ひずみ計８は、供試素材の中央部１ａの形状に
合致するよう円柱主軸８ａを２本構成として、同主軸の
一端８ｂには、ひずみゲージ８ｃが貼付けられたバネ板
８ｄで固定し、他端８ｅには、供試素材１を自抱装着す
るためのスプリング８ｆを装着している。The first displacement strain gauge 8 has a light weight, small size, and a simple structure so that the first displacement strain gauge 8 can be self-embracingly attached to the sample material 1.
The first displacement strain gauge 8 has two columnar spindles 8a configured to match the shape of the central portion 1a of the test material, and one end 8b of the spindle is fixed with a spring plate 8d to which a strain gauge 8c is attached. The other end 8e is equipped with a spring 8f for holding the sample material 1 on its own.
【００１６】ひずみゲージ８ｃは、プチルゴム系のコー
ティング材８ｇで保護する。本装置で、第１変位ひずみ
計８と第２変位ひずみ計９の２種を用いる理由は、次の
理由による。The strain gauge 8c is protected by a butyl rubber coating material 8g. The reason why the first displacement strain gauge 8 and the second displacement strain gauge 9 are used in this apparatus is as follows.
【００１７】本発明の疲労試験装置は、引張圧縮疲労試
験機の中で現在主流となっている電気油圧サーボ疲労試
験機であり、本発明の試験機の基本動作は、荷重、ひず
み、または、ストロークの内の、１つのフィードバック
信号と制御装置内に装着されている基準信号発生器の信
号の差が０（ゼロ）となるように制御されるものであ
る。The fatigue testing apparatus of the present invention is an electrohydraulic servo fatigue testing machine that is currently the mainstream of the tensile and compression fatigue testing machines, and the basic operation of the testing machine of the present invention is load, strain, or The stroke is controlled so that the difference between one feedback signal and the signal of the reference signal generator mounted in the control device becomes 0 (zero).
【００１８】本発明で対象にしているひずみ制御も、供
試素材のひずみを検出した第１変位ひずみ計の信号をフ
ィードバック信号として制御すべきであるが、極低温下
にある液体窒素中に水没した状況の第１変位ひずみ計
は、液体窒素の流動により出力信号に微小ノイズが発生
する。In the strain control targeted by the present invention, the signal of the first displacement strain gauge that detects the strain of the sample material should be controlled as a feedback signal, but it is submerged in liquid nitrogen at a cryogenic temperature. In the first displacement strain gauge in such a situation, a minute noise is generated in the output signal due to the flow of liquid nitrogen.
【００１９】そのため、水没した第１変位ひずみ計の出
力信号をフィードバック信号として疲労試験装置を制御
すれば、信号の微小ノイズによって負荷の変動（ノイ
ズ）を生じ、正常な試験はできない。Therefore, if the fatigue test apparatus is controlled by using the output signal of the first displacement strain gauge submerged in water as a feedback signal, a minute noise of the signal causes load fluctuation (noise), and a normal test cannot be performed.
【００２０】この負荷の変動は、供試素材に作用する負
荷の量が小さいほど（弾性域）大きい変動となり、負荷
の量が大きくなり塑性域になれば、第１変位ひずみ計の
微小ノイズは負荷の変動にあまり影響しなくなる。The fluctuation of the load becomes larger as the amount of load acting on the material under test is smaller (elastic range). If the amount of load becomes large and becomes the plastic range, the minute noise of the first displacement strain gauge will be small. Less affected by load fluctuations.
【００２１】これは、図４に示すように、金属の引張特
性によるもので、同じ量の微小ノイズでも弾性域と塑性
域では負荷の変動量が変わるためである。そのため、本
発明では、フィードバック信号として常に制御に用いる
のは、ノイズの影響を受けない液層外に取り付けた第２
変位ひずみ計とした。This is due to the tensile properties of the metal, as shown in FIG. 4, because the amount of change in load changes in the elastic region and the plastic region even with the same amount of minute noise. Therefore, in the present invention, the feedback signal that is always used for control is the second one mounted outside the liquid layer that is not affected by noise.
A displacement strain gauge was used.
【００２２】ただし、供試素材の疲労試験としての負荷
条件は供試素材のひずみを検出する第１変位ひずみ計の
出力であるひずみ量であるために、常に第１変位ひずみ
計の出力量を監視し、所定のひずみ値（ピーク値）で制
御基本波形を反転させることによって、第１変位ひずみ
計のひずみ量が所定のひずみとなるようにしたものであ
る。However, since the load condition for the fatigue test of the test material is the strain amount which is the output of the first displacement strain gauge for detecting the strain of the test material, the output amount of the first displacement strain gauge is always set. By monitoring and inverting the control basic waveform at a predetermined strain value (peak value), the strain amount of the first displacement strain gauge becomes a predetermined strain.
【００２３】すなわち、 （１）第１変位ひずみ計は供試素材の直接のひずみを検
出させるためであり、第２変位ひずみ計はフィードバッ
ク制御用の信号として利用する手段とするためである。 （２）しかし、疲労試験の負荷条件は供試体に直接作用
したひずみ範囲であるために、第１変位ひずみ計の所定
のひずみ値（ピーク値）の時点で制御波形を反転させる
必要がある。 ３）本発明の試験装置に使用するフィードバックの制御
信号は、第２変位ひずみ計からの信号であるが、上記
（２）項の反転により、あたかも供試素材のひずみが所
定のひずみ値で制御されることになる。That is, (1) The first displacement strain gauge is for detecting the direct strain of the test material, and the second displacement strain gauge is for use as a signal for feedback control. (2) However, since the load condition of the fatigue test is the strain range that directly acts on the specimen, it is necessary to invert the control waveform at the time of the predetermined strain value (peak value) of the first displacement strain gauge. 3) The feedback control signal used in the test apparatus of the present invention is the signal from the second displacement strain gauge, but by reversing the above item (2), the strain of the sample material is controlled at a predetermined strain value. Will be done.
【００２４】図５は、２つの変位ひずみ計の出力をピー
ク値検出器１２及び反転信号器１３を組合わせた例であ
る。図５（Ｂ）でのひずみε１が供試素材のひずみ計出
力であり、ひずみε２が制御波形である。FIG. 5 shows an example in which the outputs of the two displacement strain gauges are combined with the peak value detector 12 and the inversion signal device 13. Strain ε1 in FIG. 5B is the strain gauge output of the sample material, and strain ε2 is the control waveform.
【００２５】ひずみε１の上限ピ−ク検出位置と下限ピ
−ク検出位置が、供試素材の負荷条件としたひずみ範囲
である。ここで、ひずみε１の出力信号が上昇時に、上
限ピ−ク検出位置と同値または以上になれば、反転信号
器１３の作動により、制御基本波形を下降方向へ反転さ
せる。The upper limit peak detection position and the lower limit peak detection position of the strain ε1 are the strain range set as the load condition of the test material. Here, if the output signal of the strain ε1 rises to the same value as or higher than the upper limit peak detection position at the time of rising, the reversal signal device 13 is operated to reverse the control basic waveform in the falling direction.
【００２６】また、逆に、ひずみε１の出力信号が下降
時に、下限ピ−ク検出位置と同値になれば、制御基本波
形を上昇方向へ反転させる。この繰り返しにより、供試
素材のひずみε１のひずみ範囲が一定となった疲労試験
が可能となる。On the contrary, if the output signal of the strain ε1 has the same value as the lower limit peak detection position when the output signal is descending, the control basic waveform is inverted in the ascending direction. By repeating this, it is possible to perform a fatigue test in which the strain range of the strain ε1 of the sample material is constant.
【００２７】図６は、本発明の疲労試験装置により実施
した極低温下（−１９６℃）での応力−ひずみ曲線の計
測結果の例を示す。これは、第１変位ひずみ計の出力を
Ｘ軸に、それにより発生した応力（荷重÷供試体断面積
＝応力）をＹ軸に記録した、グラフとして表示したもの
である。図７は、本発明の第１の実施の形態に係る疲労
試験結果の１例を示す。FIG. 6 shows an example of the measurement result of the stress-strain curve under cryogenic temperature (−196 ° C.) carried out by the fatigue test apparatus of the present invention. This is displayed as a graph in which the output of the first displacement strain gauge is recorded on the X-axis, and the stress (load / sample cross-sectional area = stress) generated thereby is recorded on the Y-axis. FIG. 7 shows an example of the fatigue test result according to the first embodiment of the present invention.
【００２８】[0028]
【発明の効果】本発明は前述のように構成されているの
で、以下に記載するような効果を奏する。 １）本発明の試験装置により極低温下でのひずみ制御の
疲労試験が可能になった。 ２）本発明の試験装置により実施できる極低温下での疲
労試験により、室温における疲労強度よりも極低温下で
の疲労強度がどの程度向上するかを明らかにすることが
できる。Since the present invention is constructed as described above, it has the following effects. 1) The test apparatus of the present invention enables a strain-controlled fatigue test under cryogenic temperature. 2) It is possible to clarify how much the fatigue strength under cryogenic temperature is improved as compared with the fatigue strength at room temperature by the fatigue test under cryogenic temperature which can be carried out by the test apparatus of the present invention.
【００２９】すなわち、図７に示すように極低温下での
疲労強度と室温における疲労強度の比較から、材料の寿
命が、極低温下では室温における寿命よりも格段に向上
すること、およびその量を確認することができる。That is, as shown in FIG. 7, from the comparison of the fatigue strength at cryogenic temperature and the fatigue strength at room temperature, the life of the material is remarkably improved at room temperature at cryogenic temperature, and its amount. Can be confirmed.
【図１】本発明の第１の実施の形態に係る装置の全体構
成図。FIG. 1 is an overall configuration diagram of an apparatus according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態に係る液層部断面の
拡大図。FIG. 2 is an enlarged view of a cross section of a liquid layer portion according to the first embodiment of the present invention.
【図３】本発明の第１の実施の形態に係る自抱装着式第
１変位ひずみ計の構造図。FIG. 3 is a structural diagram of a self-holding type first displacement strain gauge according to the first embodiment of the present invention.
【図４】ひずみの変動と荷重の変動の関係を示す図。FIG. 4 is a diagram showing a relationship between strain variation and load variation.
【図５】本発明の第１の実施の形態に係るひずみ制御の
基本構成および機能説明図。FIG. 5 is a diagram illustrating the basic configuration and function of strain control according to the first embodiment of the present invention.
【図６】本発明の第１の実施の形態に係るひずみ計測結
果の１例を示す図。FIG. 6 is a diagram showing an example of a strain measurement result according to the first embodiment of the present invention.
【図７】本発明の第１の実施の形態に係る疲労試験結果
の１例を示す図。FIG. 7 is a diagram showing an example of fatigue test results according to the first embodiment of the present invention.
【図８】従来の疲労試験装置の構成図。FIG. 8 is a block diagram of a conventional fatigue test apparatus.
１…供試素材、 １ａ…供試素材中央部、 ２…断熱液層部、 ２ａ…硬質断熱材、 ２ｂ…金属薄板、 ３…温度センサ、 ４…バルブ開閉制御器、 ５…バルブ、 ６…液体窒素タンク、 ６ａ…液体窒素、 ７…流入管、 ８…第１変位ひずみ計、 ８ａ…円柱主軸、 ８ｂ，…主軸端部、 ８ｃ…ひずみゲージ、 ８ｄ…バネ板、 ８ｅ…主軸端部、 ８ｆ…スプリング、 ８ｇ…コーティング材、 ８ｘ…計測リード線、 ９…第２変位ひずみ計、 １０…シ−ルパッキン、 １１…排気口、 １２…ピーク値検出器、 １３…反転信号器、 ２１…ロードフレーム、 ２２…負荷装置、 ２３…ロードセル、 ２４…ストローク検出計、 ２５…制御装置、 ２６…サーボバルブ、 １００…液体窒素を安定供給する手段、 １０２…液層。 ε１…第１変位ひずみ計で検出したひずみ、 ε２…第２変位ひずみ計で検出したひずみ。 DESCRIPTION OF SYMBOLS 1 ... Test material, 1a ... Test material center part, 2 ... Adiabatic liquid layer part, 2a ... Hard heat insulating material, 2b ... Metal thin plate, 3 ... Temperature sensor, 4 ... Valve opening / closing controller, 5 ... Valve, 6 ... Liquid nitrogen tank, 6a ... Liquid nitrogen, 7 ... Inflow pipe, 8 ... First displacement strain gauge, 8a ... Cylindrical spindle, 8b, ... Spindle end, 8c ... Strain gauge, 8d ... Spring plate, 8e ... Spindle end, 8f ... Spring, 8g ... Coating material, 8x ... Measurement lead wire, 9 ... Second displacement strain gauge, 10 ... Seal packing, 11 ... Exhaust port, 12 ... Peak value detector, 13 ... Inversion signal device, 21 ... Load Frame, 22 ... Load device, 23 ... Load cell, 24 ... Stroke detector, 25 ... Control device, 26 ... Servo valve, 100 ... Means for stably supplying liquid nitrogen, 102 ... Liquid layer. ε1 ... Strain detected by the first displacement strain gauge, ε2 ... Strain detected by the second displacement strain gauge.
Claims (2)
り、供試素材の耐えうる力や疲労強度等の物理定数を得
る材料試験装置において、（Ａ）ロードフレーム（２
１）に装着した負荷装置（２２）と、（Ｂ）供試素材
（１）に作用する力を検出するロードセル（２３）と、
（Ｃ）前記負荷装置（２２）の移動量を検出するストロ
ーク検出計（２４）と、（Ｄ）前記供試素材（１）を冷
却する断熱液層部（２）と、（Ｅ）前記供試素材（１）
に自抱装着した第１変位ひずみ計（８）と、（Ｆ）前記
断熱液層部（２）の外に装着した第２変位ひずみ計
（９）と、（Ｇ）前記断熱液層部（２）に液体窒素を安
定供給する手段（１００）と、（Ｈ）前記ロードセル
（２３）からの信号と、ストローク検出計（２４）から
の信号と、第１変位ひずみ計（８）からの信号と、第２
変位ひずみ計（９）からの信号を入力し、前記負荷装置
（２２）のサーボバルブ（２６）にフィードバック信号
を出力する制御装置（２５）から成り、（Ｉ）前記断熱
液層部（２）は、硬質断熱材（２ａ）を金属薄板（２
ｂ）で全面被覆した構造にし、（Ｊ）前記断熱液層部
（２）に液体窒素を安定供給する手段（１００）は、液
体窒素タンク（６）と、流入管（７）と、バルブ（５）
と、温度センサ（３）からの信号を入力しバルブ（５）
に制御信号を出力するバルブ開閉制御器（４）からなる
ことを特徴とする疲労試験装置。1. A material testing apparatus for obtaining a physical constant such as a force that a test material can withstand and a fatigue strength by applying an external load force to the test material, comprising: (A) a load frame (2)
A load device (22) attached to 1), (B) a load cell (23) for detecting a force acting on the test material (1),
(C) A stroke detector (24) that detects the amount of movement of the load device (22), (D) an adiabatic liquid layer section (2) that cools the sample material (1), and (E) the sample Trial material (1)
A first displacement strain gauge (8) self-embracingly attached to (1), (F) a second displacement strain gauge (9) attached outside the adiabatic liquid layer (2), and (G) an adiabatic liquid layer ( 2) means for supplying liquid nitrogen stably, (H) a signal from the load cell (23), a signal from the stroke detector (24), and a signal from the first displacement strain gauge (8). And the second
The control device (25) inputs a signal from the displacement strain gauge (9) and outputs a feedback signal to the servo valve (26) of the load device (22). (I) The adiabatic liquid layer section (2) Is a hard heat insulating material (2a) and a thin metal plate (2a
(b) A means (100) for stably supplying liquid nitrogen to the adiabatic liquid layer portion (2) has a structure in which the entire surface is covered with b), a liquid nitrogen tank (6), an inflow pipe (7), and a valve ( 5)
And the signal from the temperature sensor (3) is input to the valve (5)
A fatigue test apparatus comprising a valve opening / closing controller (4) for outputting a control signal to the.
変位ひずみ計（８）は、断熱液層部（２）内の極低温状
態における供試素材（１）の直接のひずみを検出して、
検出信号を制御装置（２５）に出力し、（Ｂ）断熱液層
部（２）の外に装着した第２変位ひずみ計（９）は、フ
ィードバック制御用のひずみを検出して、検出信号を制
御装置（２５）に出力することを特徴とする請求項１記
載の疲労試験装置。2. A first self-embracing attachment to (A) test material (1)
The displacement strain gauge (8) detects the direct strain of the sample material (1) in the cryogenic state in the adiabatic liquid layer section (2),
The second displacement strain gauge (9), which outputs the detection signal to the control device (25) and is attached to the outside of the (B) adiabatic liquid layer portion (2), detects the strain for feedback control and outputs the detection signal. The fatigue test apparatus according to claim 1, wherein the fatigue test apparatus outputs it to a control device (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29839595A JPH09138190A (en) | 1995-11-16 | 1995-11-16 | Fatigue testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29839595A JPH09138190A (en) | 1995-11-16 | 1995-11-16 | Fatigue testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09138190A true JPH09138190A (en) | 1997-05-27 |
Family
ID=17859153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29839595A Withdrawn JPH09138190A (en) | 1995-11-16 | 1995-11-16 | Fatigue testing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09138190A (en) |
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-
1995
- 1995-11-16 JP JP29839595A patent/JPH09138190A/en not_active Withdrawn
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