JP3130111B2 - Measuring method of magnetostriction sensitivity - Google Patents
Measuring method of magnetostriction sensitivityInfo
- Publication number
- JP3130111B2 JP3130111B2 JP04035297A JP3529792A JP3130111B2 JP 3130111 B2 JP3130111 B2 JP 3130111B2 JP 04035297 A JP04035297 A JP 04035297A JP 3529792 A JP3529792 A JP 3529792A JP 3130111 B2 JP3130111 B2 JP 3130111B2
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- stress
- magnetostrictive
- tube
- measured
- 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 - Lifetime
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、鋼管などの管を、磁歪
応力測定法を用いてその管軸を含む平面内で曲げモーメ
ントが作用したときに生じる磁歪応力を測定する際に必
要な磁歪感度を測定するための方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring magnetostriction necessary for measuring a magnetostrictive stress generated when a bending moment acts on a pipe such as a steel pipe in a plane including the pipe axis by using a magnetostrictive stress measuring method. It relates to a method for measuring sensitivity.
【0002】[0002]
【従来の技術】磁歪応力測定法は、強磁性材料である鋼
などの材料に荷重が作用すると、透磁率に異方性が生
じ、荷重方向の透磁率が大きくなり、反対に荷重方向と
直角方向の透磁率が小さくなるという現象を利用し、両
透磁率の差を磁歪センサによって検出して、主応力の方
向および大きさを測定する手法である。磁歪感度をMと
し、管の管軸を含む平面内で曲げモーメントが作用した
ときにおける真の応力をσとし、磁歪センサの出力をV
とするとき、数1が成立する。2. Description of the Related Art In a magnetostrictive stress measurement method, when a load is applied to a material such as steel, which is a ferromagnetic material, anisotropy is generated in the magnetic permeability, and the magnetic permeability in the load direction increases, and conversely, the magnetic permeability is perpendicular to the load direction. This method measures the direction and magnitude of the main stress by detecting the difference between the two magnetic permeability by using a phenomenon that the magnetic permeability in the direction becomes small and detecting the difference between the two magnetic permeability. M is the magnetostriction sensitivity, σ is the true stress when a bending moment acts in a plane including the tube axis of the tube, and V is the output of the magnetostriction sensor.
Then, Equation 1 is established.
【0003】V=M・σ 磁歪感度Mは、鋼管の材質および製造方法などによって
定まる物性値であり、通常、測定対象の鋼管の実管曲げ
試験によって求められる。先行技術では、鋼管などの管
の各端部を各支点で支持し、支点間の2つの点4,5に
おいて荷重をそれぞれ載荷し、管の外周面に、周方向に
間隔をあけて複数の歪ゲージ6を設けて真の曲げ応力σ
を求めるとともに、磁歪センサを、管の外周面に固定し
たレールに沿って周方向に移動しつつその出力Vを測定
し、これによって真の曲げ応力σと出力とで示されるグ
ラフを得る。磁歪感度Mは、そのグラフの傾きで示され
る比例定数である。各管毎に、磁歪感度Mを予め測定し
ておき、測定しようとする管の磁歪応力を磁歪センサに
よって測定し、これによって磁歪応力σを測定すること
ができる。V = M · σ Magnetostrictive sensitivity M is a physical property value determined by the material and manufacturing method of a steel pipe, and is usually determined by a bending test of an actual steel pipe to be measured. In the prior art, each end of a pipe such as a steel pipe is supported at each fulcrum, and loads are respectively loaded at two points 4 and 5 between the fulcrums, and a plurality of pipes are provided on the outer peripheral surface of the pipe at circumferentially spaced intervals. The true bending stress σ by providing the strain gauge 6
And the output V is measured while moving the magnetostrictive sensor in the circumferential direction along the rail fixed to the outer peripheral surface of the tube, thereby obtaining a graph represented by the true bending stress σ and the output. The magnetostriction sensitivity M is a proportional constant indicated by the slope of the graph. The magnetostriction sensitivity M is measured in advance for each tube, and the magnetostrictive stress of the tube to be measured is measured by a magnetostrictive sensor, whereby the magnetostrictive stress σ can be measured.
【0004】[0004]
【発明が解決しようとする課題】このような先行技術で
は、磁歪感度Mを測定する対象となる鋼管が小口径であ
るときには、その実管曲げ試験は比較的容易であるけれ
ども、大口径管、たとえば呼径600A、750A、9
00A、1000A、1200Aなどでは、大規模な試
験設備を必要とし、コスト面からも、作業性の面から
も、大きな問題となる。In such a prior art, when a steel pipe for which the magnetostriction sensitivity M is to be measured has a small diameter, the actual pipe bending test is relatively easy. Nominal diameter 600A, 750A, 9
In the case of 00A, 1000A, 1200A, etc., a large-scale test facility is required, which is a serious problem from the viewpoint of cost and workability.
【0005】本発明の目的は、磁歪感度を容易に求める
ことができるようにした磁歪感度の測定方法を提供する
ことである。[0005] It is an object of the present invention to provide a method for measuring the magnetostriction sensitivity so that the magnetostriction sensitivity can be easily obtained.
【0006】[0006]
【課題を解決するための手段】本発明は、磁歪応力を測
定すべき管を、その管の管軸13に沿って細長い試験片
11を切出し、試験片11の管軸13を含む平面14内
で、管軸方向に間隔をあけた2つの支点17,18上
に、試験片11を支持し、それらの支点17,18の管
軸方向両外方で、前記平面14内で、2つの荷重点1
9,20において、管軸13に垂直な力F1,F2を作
用させることによって、試験片11に曲げモーメントを
作用させた状態で、試験片11に作用する真の引張り応
力σを、試験片11の外表面に設けた応力測定手段15
によって測定し、かつ磁歪センサ140で、試験片11
の外表面の管軸方向と周方向との各透磁率が異なること
に起因した前記真の引張り応力σに対応した出力Vを測
定し、応力測定手段によって測定された引張り応力σ
と、磁歪センサの出力Vとから、管の磁歪感度Mを求め
ることを特徴とする磁歪管路の測定方法である。また本
発明は、磁歪応力を測定すべき管を、その管の管軸13
に沿って細長い試験片11を切出し、試験片11の管軸
13を含む平面14内で、管軸方向に間隔をあけた2つ
の支点21,22上に、試験片11を支持し、それらの
支点21,22の管軸方向両内方で、前記平面14内
で、2つの荷重点23,24において、管軸13に垂直
な力F3,F4を作用させることによって、試験片11
に曲げモーメントを作用させた状態で、試験片11に作
用する真の圧縮応力σを、試験片11の外表面に設けた
応力測定手段15によって測定し、かつ磁歪センサ14
0で、試験片11の外表面の管軸方向と周方向との各透
磁率が異なることに起因した前記真の圧縮応力σに対応
した出力Vを測定し、応力測定手段によって測定された
圧縮応力σと、磁歪センサの出力Vとから、管の磁歪感
度Mを求めることを特徴とする磁歪管路の測定方法であ
る。According to the present invention, a tube whose magnetostrictive stress is to be measured is cut out of an elongated test piece 11 along a tube axis 13 of the tube, and is cut in a plane 14 containing the tube axis 13 of the test piece 11. The test piece 11 is supported on two fulcrums 17 and 18 spaced apart in the pipe axis direction, and two loads in the plane 14 at both outer sides of the fulcrums 17 and 18 in the pipe axis direction. Point 1
In steps 9 and 20, by applying forces F1 and F2 perpendicular to the tube axis 13 and applying a bending moment to the test piece 11, the true tensile stress .sigma. Measuring means 15 provided on the outer surface of the
And the test piece 11 is measured by the magnetostrictive sensor 140.
The output V corresponding to the true tensile stress σ caused by the difference in the magnetic permeability between the tube axis direction and the circumferential direction of the outer surface of the outer surface is measured, and the tensile stress σ measured by the stress measuring means is measured.
And measuring the magnetostrictive sensitivity M of the tube from the output V of the magnetostrictive sensor. The present invention also relates to a method for measuring a tube whose magnetostrictive stress is to be measured by using a tube shaft 13 of the tube.
The test piece 11 is cut out along an axis, and the test piece 11 is supported on two fulcrums 21 and 22 spaced apart in the tube axis direction in a plane 14 including the tube axis 13 of the test piece 11 and By applying forces F3 and F4 perpendicular to the tube axis 13 at the two load points 23 and 24 in the plane 14 on both insides of the fulcrums 21 and 22 in the tube axis direction, the test piece 11
With the bending moment acting on the test piece 11, the true compressive stress σ acting on the test piece 11 is measured by the stress measuring means 15 provided on the outer surface of the test piece 11, and the magnetostrictive sensor 14 is measured.
0, the output V corresponding to the true compressive stress σ caused by the difference in the magnetic permeability of the outer surface of the test piece 11 between the tube axis direction and the circumferential direction was measured, and the compression measured by the stress measuring means was measured. This is a method for measuring a magnetostrictive conduit, wherein a magnetostrictive sensitivity M of a tube is obtained from a stress σ and an output V of a magnetostrictive sensor.
【0007】また本発明は、応力測定手段は、歪ゲージ
であることを特徴とする。Further, the present invention is characterized in that the stress measuring means is a strain gauge.
【0008】[0008]
【作用】本発明に従えば、磁歪応力が測定されるべき鋼
管などの管を、その管軸に沿って切出して細長い試験片
を作成し、この試験片に、試験片を前記管軸に平行な平
面内で、たとえば前記管軸13を含む一平面14内で、
曲げモーメントを作用させる。試験片11に真の引張り
応力σを作用させるには、試験片11を、前記平面14
内で、管軸方向に間隔をあけた2つの支点17,18上
に支持し、それらの支点17,18の管軸方向両外方
で、前記平面14内で、2つの荷重点19,20におい
て管軸13に垂直な力F1,F2を作用する。試験片1
1に真の圧縮応力σを作用させるには、2つの支点2
1,22上に試験片11を支持し、それらの支点21,
22の管軸方向両内方で、2つの荷重点23,24にお
いて、力F3,F4を上述と同様に作用する。こうして
試験片11の外表面に設けた応力測定手段15によって
引張り応力σまたは圧縮応力σを測定する。またこの曲
げモーメント作用時、磁歪センサ140を用いて試験片
11の外表面の管軸方向と周方向との各透磁率が異なる
ことに起因した前記真の引張り応力σまたは前記真の圧
縮応力σに対応した出力Vを測定する。こうして得られ
た引張り応力σまたは圧縮応力σと磁歪センサの出力V
とから、管の磁歪感度Mを求めることができる。こうし
て磁歪感度を求めるようにしたので、大口径管であって
も、その試験片の曲げ変形に必要な外力は比較的小さく
てよく、したがって先行技術に関連して述べた大規模な
試験設備は必要ではなくなり、コスト面および作業性の
いずれも改善される。According to the present invention, a tube such as a steel tube whose magnetostrictive stress is to be measured is cut out along the tube axis to form an elongated test piece, and the test piece is placed parallel to the tube axis. In a plane, for example, in a plane 14 including the tube axis 13,
Apply a bending moment. To apply a true tensile stress σ to the test piece 11, the test piece 11 is
And two supporting points 17 and 18 spaced apart in the pipe axis direction, and two load points 19 and 20 in the plane 14 on both outer sides of the supporting points 17 and 18 in the pipe axis direction. Apply forces F1 and F2 perpendicular to the tube axis 13. Test piece 1
To apply a true compressive stress σ to 1, two fulcrums 2
The test pieces 11 are supported on
The forces F3 and F4 act in the same manner as described above at the two load points 23 and 24 on both inner sides in the tube axis direction 22. Thus, the tensile stress σ or the compressive stress σ is measured by the stress measuring means 15 provided on the outer surface of the test piece 11. When the bending moment acts, the true tensile stress σ or the true compressive stress σ caused by the difference in the magnetic permeability between the tube axis direction and the circumferential direction of the outer surface of the test piece 11 using the magnetostrictive sensor 140. Is measured. The tensile stress σ or the compressive stress σ thus obtained and the output V of the magnetostrictive sensor
From this, the magnetostriction sensitivity M of the tube can be obtained. Since the magnetostrictive sensitivity is determined in this way, even for a large-diameter tube, the external force required for bending deformation of the test piece may be relatively small, and therefore, the large-scale test equipment described in connection with the prior art is This is no longer necessary, and both cost and workability are improved.
【0009】[0009]
【実施例】図1は本発明の一実施例の試験片11の斜視
図である。この試験片11は、図2に示される鋼管12
を、その管軸13に沿って切出して細長く作成される。
この試験片11の両側端11a,11bは、管軸13に
平行な平面内にある。また試験片11の軸線方向両端部
11c,11dは、管軸13に垂直な各平面内にある。
鋼管12は、たとえば呼径300mmφであって、その
厚みは、たとえば5mmである。FIG. 1 is a perspective view of a test piece 11 according to one embodiment of the present invention. This test piece 11 is a steel pipe 12 shown in FIG.
Is cut out along the tube axis 13 to be elongated.
Both ends 11 a and 11 b of the test piece 11 are in a plane parallel to the tube axis 13. Both ends 11 c and 11 d in the axial direction of the test piece 11 are in respective planes perpendicular to the tube axis 13.
The steel pipe 12 has, for example, a nominal diameter of 300 mmφ and a thickness of, for example, 5 mm.
【0010】図3は、試験片11の平面図である。試験
片11の管軸13に沿う長さL1はたとえば1250m
mであり、その管軸13に垂直な幅L2は100mmで
ある。試験片11に、その試験片を、管軸13を含む平
面14内で、曲げモーメントを作用させたときに、その
試験片11の外表面におけるの真の応力を測定するため
に、応力測定手段である1または複数(この実施例では
9)の歪ゲージ15が設けられる。FIG. 3 is a plan view of the test piece 11. The length L1 of the test piece 11 along the pipe axis 13 is, for example, 1250 m.
m, and the width L2 perpendicular to the tube axis 13 is 100 mm. In order to measure the true stress on the outer surface of the test piece 11 when a bending moment is applied to the test piece 11 in a plane 14 including the tube axis 13, a stress measuring means is provided. One or more (9 in this embodiment) strain gauges 15 are provided.
【0011】図4は、試験片11に引張り応力を作用さ
せるときの状態を説明する側面図である。試験片11
は、剛性のH型鋼16のフランジ上に設けられた2つの
支点17,18上に支持し、荷重点19,20において
力F1,F2を作用させる。支点17,18と荷重点1
9,20は、試験片11の幅方向中央位置にある。この
力F1,F2は、前記平面14内にあり、相互に平行で
あって管軸13に垂直である。こうして試験片11に曲
げモーメントを作用し、このとき歪ゲージ15によっ
て、試験片11に作用する真の引張り応力σを検出する
とともに、磁歪センサ140の出力Vを得る。FIG. 4 is a side view for explaining a state when a tensile stress is applied to the test piece 11. Test piece 11
Are supported on two fulcrums 17, 18 provided on a flange of a rigid H-section steel 16 and apply forces F1, F2 at load points 19, 20. Support points 17, 18 and load point 1
Reference numerals 9 and 20 are located at the center of the test piece 11 in the width direction. The forces F1, F2 are in the plane 14, parallel to each other and perpendicular to the tube axis 13. Thus, a bending moment is applied to the test piece 11. At this time, the true tensile stress σ acting on the test piece 11 is detected by the strain gauge 15, and the output V of the magnetostrictive sensor 140 is obtained.
【0012】また試験片11に圧縮応力を作用させるた
めには、図5のように、試験片11を支点21,22上
に支持し、荷重点23,24で力F3,F4を作用す
る。支点21,22と荷重点23,24とは、試験片1
1の幅方向中央位置にある。ここで力F3,F4は、等
しい値であり、この実施例では前記平面14内にあり、
管軸13に垂直である。このときにもまた、試験片11
に設けられた歪ゲージ15によって真の圧縮応力を測定
するとともに、磁歪センサ140の出力Vを得る。In order to apply a compressive stress to the test piece 11, the test piece 11 is supported on fulcrums 21 and 22, and forces F3 and F4 are applied at load points 23 and 24, as shown in FIG. The supporting points 21 and 22 and the load points 23 and 24 are
1 at the center in the width direction. Where the forces F3, F4 are of equal value and in this embodiment are in the plane 14;
Perpendicular to the tube axis 13. Also at this time, the test piece 11
The true compressive stress is measured by the strain gauge 15 provided in the sensor and the output V of the magnetostrictive sensor 140 is obtained.
【0013】磁歪センサ140の構成は、図6にその斜
視図が示されており、図7はその磁歪センサ140の簡
略化した平面図である。磁歪センサ140では、逆U字
状のコア168には、そのコア168に巻回される磁歪
応力測定用励磁コイルである励磁コイル169が巻回さ
れる。コア168の一対の磁極170,171は、管軸
13方向に90度以外の角度θ3(この実施例ではθ3
=45度)で交差する直線177の方向に間隔をあけて
設けられる。さらにまたコア173が設けられ、このコ
ア173には検出コイル174が巻回される。このコア
173の磁極175,176は、コア168の一対の磁
極170,171を結ぶ直線177に対して垂直な直線
178の方向に間隔をあけて配置される。各磁極17
0,171;175,176の試験片11に対向する端
面の図心は仮想上の正方形の各頂点位置にある。励磁コ
イル169は交流電源179によって励磁され、検出コ
イル174の誘導起電力は電圧計などの電圧測定手段1
80によって検出される。真の応力σと磁歪感度Mと検
出コイル174の誘導起電力Vとは、前述の数1の関係
がある。コア168,173とコイル169,174と
を含む磁歪センサ140は、直線177,178の交点
185(図7参照)を通る試験片11の一直径線に関し
て総対称に構成される。FIG. 6 is a perspective view of the configuration of the magnetostrictive sensor 140, and FIG. 7 is a simplified plan view of the magnetostrictive sensor 140. In the magnetostrictive sensor 140, an exciting coil 169, which is an exciting coil for measuring magnetostrictive stress, is wound around the inverted U-shaped core 168. The pair of magnetic poles 170 and 171 of the core 168 are connected to the tube axis 13 at an angle θ3 other than 90 ° (θ3 in this embodiment).
(= 45 degrees) at intervals in the direction of a straight line 177 that intersects at an angle. Further, a core 173 is provided, and a detection coil 174 is wound around the core 173. The magnetic poles 175 and 176 of the core 173 are spaced from each other in a direction of a straight line 178 perpendicular to a straight line 177 connecting the pair of magnetic poles 170 and 171 of the core 168. Each magnetic pole 17
The centroids of the end faces of the test pieces 11 of 0, 171; 175, 176 are located at the vertices of a virtual square. The exciting coil 169 is excited by an AC power supply 179, and the induced electromotive force of the detecting coil 174 is measured by a voltage measuring means 1 such as a voltmeter.
80. The true stress σ, the magnetostriction sensitivity M, and the induced electromotive force V of the detection coil 174 have the above-described relationship of Equation 1. The magnetostrictive sensor 140 including the cores 168 and 173 and the coils 169 and 174 is configured to be totally symmetric with respect to one diameter line of the test piece 11 passing through an intersection 185 (see FIG. 7) of the straight lines 177 and 178.
【0014】磁歪センサ140では、コア168の磁極
170,171はコア173の磁極175と等距離にあ
り、試験片11の管軸方向に磁歪応力σが発生していな
い状態では、その試験片11の管軸方向および周方向の
透磁率μは等しく、したがって励磁コイル169が交流
電源179によって励磁されているとき、たとえば磁極
171から磁極175に入る磁束と、この磁極175か
ら磁極170に出ていく磁束とは等しく、同様なことは
磁極176に関しても成立し、したがって電圧測定手段
180によって検出される検出コイル174の誘導起電
力である出力Vは零またはごく小さい値である。管軸方
向に応力σが作用すると、管1の管軸方向と周方向との
各透磁率は異なり、したがって誘導起電力である出力V
は、応力σと磁歪感度Mとに対応した値となる。In the magnetostrictive sensor 140, the magnetic poles 170 and 171 of the core 168 are equidistant from the magnetic pole 175 of the core 173, and when the magnetostrictive stress σ is not generated in the tube axis direction of the test piece 11, Have the same magnetic permeability μ in the tube axis direction and in the circumferential direction. Therefore, when the exciting coil 169 is excited by the AC power supply 179, for example, the magnetic flux entering the magnetic pole 175 from the magnetic pole 171 and the magnetic flux exiting from the magnetic pole 175 to the magnetic pole 170. The same is true for magnetic flux, and the same holds for the magnetic pole 176. Therefore, the output V, which is the induced electromotive force of the detection coil 174 detected by the voltage measuring means 180, is zero or a very small value. When the stress σ acts in the tube axis direction, the respective magnetic permeability in the tube axis direction and the circumferential direction of the tube 1 are different, and therefore, the output V, which is the induced electromotive force,
Is a value corresponding to the stress σ and the magnetostriction sensitivity M.
【0015】図4および図5に示された各実験に基づ
き、複数の各歪ゲージ15から求められる真の応力σ
と、磁歪センサ140の検出コイル174から得られる
誘導起電力Vとから、数1に基づいて、磁歪感度Mを求
めることができる。こうして得られた試験片11、した
がって鋼管12の磁歪感度Mを用いて、図8に示される
ように実際の鋼管12に作用する応力σを、磁歪センサ
140の出力Vを用いて測定することが可能になる。Based on the experiments shown in FIGS. 4 and 5, the true stress σ obtained from each of the plurality of strain gauges 15 is calculated.
And the induced electromotive force V obtained from the detection coil 174 of the magnetostrictive sensor 140, the magnetostrictive sensitivity M can be obtained based on the equation (1). Using the magnetostriction sensitivity M of the test piece 11 thus obtained, and thus of the steel pipe 12, it is possible to measure the stress σ acting on the actual steel pipe 12 using the output V of the magnetostriction sensor 140 as shown in FIG. Will be possible.
【0016】図6の参照符160は、鋼管12、したが
って試験片11の表面に被覆された防食を目的とする塗
覆装材であり、図1〜図5では、このような塗被装材1
60の図示が省略されている。歪ゲージ15および磁歪
センサ140の測定時、これらの塗覆装材160は、除
去されていてもよい。図8において磁歪センサ140
は、管12の外周面に固定された環状のレール26に沿
って周方向に移動させ、これによって鋼管12に作用す
る応力σの測定が可能である。Reference numeral 160 in FIG. 6 denotes a coating material for corrosion protection which is coated on the surface of the steel pipe 12 and thus the test piece 11. In FIGS. 1 to 5, such a coating material is shown. 1
The illustration of 60 is omitted. At the time of measurement by the strain gauge 15 and the magnetostrictive sensor 140, the coating material 160 may be removed. In FIG. 8, the magnetostrictive sensor 140
Is moved circumferentially along an annular rail 26 fixed to the outer peripheral surface of the pipe 12, whereby the stress σ acting on the steel pipe 12 can be measured.
【0017】図9は、本件発明者の実験結果を示すグラ
フである。呼径300mmφの実管試験によって求めた
磁歪感度Mを用いて測定した応力σは、ライン27で示
されている。これに対して本発明に従って、試験片11
を前述のように鋼管12から切出して、前述の手順によ
って磁歪感度Mを求め、この磁歪感度Mに基づき、実際
の鋼管12に関して磁歪センサ140を用いて出力Vを
求め、この出力Vと磁歪感度Mとから得られる応力σと
の関係を、ライン28で示す。このことから、試験片1
1を用いて得た磁歪感度Mを用いても、実管試験を行っ
たときと同様に、比較的高精度で応力σを求めることが
できることがわかる。FIG. 9 is a graph showing the experimental results of the present inventor. The stress σ measured using the magnetostriction sensitivity M obtained by an actual pipe test with a nominal diameter of 300 mmφ is shown by a line 27. On the other hand, according to the present invention, the test piece 11
Is cut out from the steel pipe 12 as described above, and the magnetostriction sensitivity M is obtained by the above-described procedure. Based on the magnetostriction sensitivity M, the output V of the actual steel pipe 12 is obtained using the magnetostriction sensor 140, and the output V and the magnetostriction sensitivity are obtained. The relationship with the stress σ obtained from M is shown by a line 28. From this, test piece 1
It can be seen that the stress σ can be obtained with relatively high accuracy even when the magnetostriction sensitivity M obtained by using No. 1 is used, as in the case of performing the actual pipe test.
【0018】磁歪センサ140は、その他の構成によっ
て実現されてもよい。また歪ゲージ15に代えてその他
の構成を有する応力測定手段を用いてもよい。The magnetostrictive sensor 140 may be realized by another configuration. Further, instead of the strain gauge 15, a stress measuring means having another configuration may be used.
【0019】[0019]
【発明の効果】以上のように本発明によれば、磁歪応力
が測定されるべき管を、その管軸に沿って切出して細長
い試験片を作成して曲げモーメントを作用させて、試験
片11に作用する真の引張り応力σまたは真の圧縮応力
σを応力測定手段15によって測定するとともに、試験
片11の外表面の管軸方向と周方向との各透磁率が異な
ることに起因した前記真の引張り応力σまたは真の圧縮
応力σに対応した磁歪センサ140の出力Vを得て、こ
れらの引張り応力σまたは圧縮応力σと、磁歪センサ1
40の出力Vを用いて、磁歪感度を求めるようにしたの
で、試験片の曲げ変形をするための外力は比較的小さく
てよく、そのため大規模な試験設備を必要とせず、した
がって安価となり、作業性が良好となる。As described above, according to the present invention, a tube whose magnetostrictive stress is to be measured is cut out along the tube axis to form an elongated test piece, and a bending moment is applied to the test piece. The true tensile stress .sigma. Or the true compressive stress .sigma. Acting on the test piece 11 is measured by the stress measuring means 15, and the true tensile stress .sigma. The output V of the magnetostrictive sensor 140 corresponding to the tensile stress σ or the true compressive stress σ is obtained.
Since the magnetostriction sensitivity is obtained using the output V of 40, the external force for bending and deforming the test piece may be relatively small, so that a large-scale test facility is not required, so that the cost is reduced, and The property becomes good.
【図1】本発明の一実施例の試験片11の斜視図であ
る。FIG. 1 is a perspective view of a test piece 11 according to one embodiment of the present invention.
【図2】試験片11が切出される鋼管12の斜視図であ
る。FIG. 2 is a perspective view of a steel pipe 12 from which a test piece 11 is cut out.
【図3】試験片11の平面図である。FIG. 3 is a plan view of a test piece 11;
【図4】試験片11の引張り応力負荷時の実験状態を示
す側面図である。FIG. 4 is a side view showing an experimental state of the test piece 11 when a tensile stress is applied.
【図5】試験片11の圧縮応力負荷時の実験状態を示す
側面図である。FIG. 5 is a side view showing an experimental state of the test piece 11 when a compressive stress is applied.
【図6】磁歪センサ140の構成を示す斜視図である。FIG. 6 is a perspective view showing a configuration of a magnetostrictive sensor 140.
【図7】磁歪センサ140の簡略化した平面図である。FIG. 7 is a simplified plan view of the magnetostrictive sensor 140.
【図8】磁歪センサ140を用いて鋼管12の応力を測
定する状態を示す側面図である。FIG. 8 is a side view showing a state where the stress of the steel pipe 12 is measured using the magnetostrictive sensor 140.
【図9】本件発明者の実験結果を示すグラフである。FIG. 9 is a graph showing experimental results of the present inventor.
11 試験片 12 鋼管 13 管軸 15 歪ゲージ 140 磁歪センサ 11 Test piece 12 Steel pipe 13 Tube axis 15 Strain gauge 140 Magnetostrictive sensor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 境 禎明 東京都千代田区丸の内一丁目1番2号 日本鋼管株式会社内 (72)発明者 塩川 征夫 東京都千代田区丸の内一丁目1番2号 日本鋼管株式会社内 (56)参考文献 特開 平3−176629(JP,A) 特開 平3−190635(JP,A) (58)調査した分野(Int.Cl.7,DB名) G01L 1/00 G01L 1/12 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshiaki Sakai 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Masao Shiokawa 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan (56) References JP-A-3-176629 (JP, A) JP-A-3-190635 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G01L 1/00 G01L 1/12
Claims (3)
軸13に沿って細長い試験片11を切出し、 試験片11の管軸13を含む平面14内で、管軸方向に
間隔をあけた2つの支点17,18上に、試験片11を
支持し、 それらの支点17,18の管軸方向両外方で、前記平面
14内で、2つの荷重点19,20において、管軸13
に垂直な力F1,F2を作用させることによって、試験
片11に曲げモーメントを作用させた状態で、 試験片11に作用する真の引張り応力σを、試験片11
の外表面に設けた応力測定手段15によって測定し、か
つ磁歪センサ140で、試験片11の外表面の管軸方向
と周方向との各透磁率が異なることに起因した前記真の
引張り応力σに対応した出力Vを測定し、 応力測定手段によって測定された引張り応力σと、磁歪
センサの出力Vとから、管の磁歪感度Mを求めることを
特徴とする磁歪管路の測定方法。1. A tube whose magnetostrictive stress is to be measured is cut into an elongated test piece 11 along a tube axis 13 of the tube. The test piece 11 is supported on the two fulcrums 17, 18, which are located outside the fulcrums 17, 18 in the tube axis direction and in the plane 14 at two load points 19, 20. 13
When the bending moment is applied to the test piece 11 by applying forces F1 and F2 perpendicular to the test piece 11, the true tensile stress σ acting on the test piece 11
The true tensile stress σ measured by the stress measuring means 15 provided on the outer surface of the test piece 11 and caused by the fact that the magnetic permeability of the outer surface of the test piece 11 in the tube axis direction differs from that in the circumferential direction by the magnetostrictive sensor 140. A method of measuring a magnetostrictive line, comprising: measuring an output V corresponding to the following equation; and obtaining a magnetostrictive sensitivity M of the tube from the tensile stress σ measured by the stress measuring means and the output V of the magnetostrictive sensor.
軸13に沿って細長い試験片11を切出し、 試験片11の管軸13を含む平面14内で、管軸方向に
間隔をあけた2つの支点21,22上に、試験片11を
支持し、 それらの支点21,22の管軸方向両内方で、前記平面
14内で、2つの荷重点23,24において、管軸13
に垂直な力F3,F4を作用させることによって、試験
片11に曲げモーメントを作用させた状態で、 試験片11に作用する真の圧縮応力σを、試験片11の
外表面に設けた応力測定手段15によって測定し、かつ
磁歪センサ140で、試験片11の外表面の管軸方向と
周方向との各透磁率が異なることに起因した前記真の圧
縮応力σに対応した出力Vを測定し、 応力測定手段によって測定された圧縮応力σと、磁歪セ
ンサの出力Vとから、管の磁歪感度Mを求めることを特
徴とする磁歪管路の測定方法。2. A tube whose magnetostrictive stress is to be measured is cut out of an elongated test piece 11 along a tube axis 13 of the tube. The test piece 11 is supported on the two fulcrums 21 and 22 which are opened, and the tube axis is formed at two load points 23 and 24 in the plane 14 on both inner sides of the fulcrums 21 and 22 in the tube axis direction. 13
In a state where a bending moment is applied to the test piece 11 by applying forces F3 and F4 perpendicular to the test piece, a true compressive stress σ acting on the test piece 11 is measured on the outer surface of the test piece 11. The output V corresponding to the true compressive stress σ caused by the difference in the magnetic permeability between the tube axis direction and the circumferential direction of the outer surface of the test piece 11 is measured by the magnetostrictive sensor 140 using the magnetostrictive sensor 140. A method for measuring a magnetostrictive sensitivity M of a tube from a compressive stress σ measured by a stress measuring means and an output V of a magnetostrictive sensor.
特徴とする請求項1記載の磁歪感度の測定方法。3. The method according to claim 1, wherein the stress measuring means is a strain gauge.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04035297A JP3130111B2 (en) | 1992-02-21 | 1992-02-21 | Measuring method of magnetostriction sensitivity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04035297A JP3130111B2 (en) | 1992-02-21 | 1992-02-21 | Measuring method of magnetostriction sensitivity |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05231961A JPH05231961A (en) | 1993-09-07 |
JP3130111B2 true JP3130111B2 (en) | 2001-01-31 |
Family
ID=12437845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP04035297A Expired - Lifetime JP3130111B2 (en) | 1992-02-21 | 1992-02-21 | Measuring method of magnetostriction sensitivity |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3130111B2 (en) |
-
1992
- 1992-02-21 JP JP04035297A patent/JP3130111B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05231961A (en) | 1993-09-07 |
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