JPS634654B2 - - Google Patents
Info
- Publication number
- JPS634654B2 JPS634654B2 JP56060424A JP6042481A JPS634654B2 JP S634654 B2 JPS634654 B2 JP S634654B2 JP 56060424 A JP56060424 A JP 56060424A JP 6042481 A JP6042481 A JP 6042481A JP S634654 B2 JPS634654 B2 JP S634654B2
- Authority
- JP
- Japan
- Prior art keywords
- resistance wire
- hole
- wire strain
- strain gauge
- residual stress
- 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
- 238000000034 method Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Description
【発明の詳細な説明】
本発明は、被検査体の残留応力を孔あけ法を用
いて精度良く測定するようにした残留応力の測定
方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring residual stress in an object to be inspected with high precision using a drilling method.
この種の残留応力測定方法に、残留応力の存在
して板などの被検査体に、小径の孔を穿設し、そ
の孔周辺部の変形から残留応力を求めるいわゆる
孔あけ法と称されるものは知られているが、その
孔あけ法による残留応力の測定方法は、第１図に
示すように、通常の寸法の抵抗線歪みゲージ１を
被検査体２に設けた孔３の周辺に同心的に貼付
け、抵抗線歪みゲージ１の信号を電気抵抗線歪み
計を用いて検出している。 This type of residual stress measurement method is called the so-called drilling method, in which a small diameter hole is drilled in an object to be inspected such as a plate where residual stress exists, and the residual stress is determined from the deformation around the hole. As shown in Fig. 1, the method for measuring residual stress by drilling a hole is known, as shown in Fig. The resistance wire strain gauges 1 are pasted concentrically, and the signal from the resistance wire strain gauge 1 is detected using an electrical resistance wire strain meter.
しかし上記残留応力の測定方法では、残留応力
場に孔を穿設する際に生じる孔周辺部での弛緩歪
みは、第２図に示すように、孔の中心から離れる
にしたがつて急激に低下し、そのため抵抗線歪み
ゲージの被検査体への貼付け位置が孔の中心から
離れると、弛緩される応力、歪みは残留応力ある
いはそれに対応する歪みに比べて小さくなり、誤
差も大きくなつて測定精度を高めることができ
ず、測定上問題となる。また抵抗線歪みゲージを
孔に近づけすぎると、孔あけ時に孔縁に機械加工
によつて塑性変形が生じているため、その塑性変
形の影響を受けて、残留応力の測定に大きな誤差
を与えることになる。 However, in the residual stress measurement method described above, the relaxation strain around the hole that occurs when drilling a hole in the residual stress field decreases rapidly as it moves away from the center of the hole, as shown in Figure 2. Therefore, when the position at which the resistance wire strain gauge is attached to the test object moves away from the center of the hole, the relaxed stress and strain become smaller than the residual stress or the corresponding strain, and the error increases, resulting in a decrease in measurement accuracy. cannot be increased, which poses a problem in measurement. In addition, if the resistance wire strain gauge is placed too close to the hole, plastic deformation occurs on the hole edge due to machining during drilling, and this plastic deformation may cause a large error in residual stress measurement. become.
本発明は上記した点に鑑みてなされたもので、
被検査体に穿設される孔の寸法に対して抵抗線歪
みゲージの寸法を決定し、さらにその抵抗線歪み
ゲージの固着位置を決定することで、歪みの検出
感度が高く、しかもドリル加工による塑性変形の
影響を小さくし得、精度の高い残留応力の測定を
可能とした残留応力の測定方法を提供することを
目的とする。 The present invention has been made in view of the above points, and
By determining the dimensions of the resistance wire strain gauge in relation to the dimensions of the hole to be drilled in the object to be inspected, and further determining the fixing position of the resistance wire strain gauge, the strain detection sensitivity is high. It is an object of the present invention to provide a method for measuring residual stress that can reduce the influence of plastic deformation and can measure residual stress with high accuracy.
以下本発明の一実施例を図面につき説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第３図において符号１０は、抵抗線歪みゲージ
であつて、その抵抗線歪みゲージ１０は、被検査
体１１に穿設した孔１２の孔半径Ｒの1/2以下の
ゲージ長さに設定されている。すなわち孔１２の
直径が２mmの場合抵抗線歪みゲージ１０のゲージ
長さは0.5mmに設定されている。そして上記抵抗
線歪みゲージ１０は、被検査体１１の孔１２の中
心から孔の半径の2.5倍から3.5倍離れた位置、た
とえば孔１２の直径が２mmなら3.25mm離れた位置
に貼着されている。この場合、好ましくは、２つ
の抵抗線歪みゲージ１０，１０を90度の間隔を置
いて配置し、さらにもう１つの抵抗線歪みゲージ
１０を抵抗線歪みゲージ１０，１０の中間位置、
すなわち135度の位置に設けると、測定精度が向
上する。 In FIG. 3, reference numeral 10 denotes a resistance wire strain gauge, and the resistance wire strain gauge 10 is set to have a gauge length that is equal to or less than 1/2 of the hole radius R of the hole 12 drilled in the test object 11. ing. That is, when the diameter of the hole 12 is 2 mm, the gauge length of the resistance wire strain gauge 10 is set to 0.5 mm. The resistance wire strain gauge 10 is pasted at a position 2.5 to 3.5 times the radius of the hole from the center of the hole 12 of the object to be inspected 11, for example, 3.25 mm if the diameter of the hole 12 is 2 mm. There is. In this case, preferably, the two resistance wire strain gauges 10, 10 are placed at an interval of 90 degrees, and another resistance wire strain gauge 10 is placed at an intermediate position between the resistance wire strain gauges 10, 10.
In other words, if it is installed at a position of 135 degrees, measurement accuracy will be improved.
第４図は歪み検出感度とドリル孔あけ加工によ
る誤差率を示すグラフであつて、いずれも一様引
張り10Kg／mm2を受ける引張試験片における歪み検
出量の比とドリル孔あけによる誤差量の比を示し
ている。すなわち適正範囲が円孔中心からの距
離／円孔半径で2.5から3.5であることをしてい
る。 Figure 4 is a graph showing the strain detection sensitivity and the error rate due to drilling. It shows the ratio. In other words, the appropriate range is distance from the hole center/hole radius from 2.5 to 3.5.
しかして被検査体の残留応力を測定するには、
まず被検査体に穿設すべき孔の孔半径の1/2以下
のゲージ長さの抵抗線歪みゲージ１０を準備し、
その抵抗線歪みゲージ１０を２つ孔の半径の2.5
倍から3.5倍の長さの半径の円上に90度の間隔を
置いて貼着し、さらにもう１つの抵抗線歪みゲー
ジ１０を同じ円上でそれぞれから135度離れた位
置に貼着する。 However, in order to measure the residual stress of the inspected object,
First, prepare a resistance wire strain gauge 10 with a gauge length less than 1/2 of the hole radius of the hole to be drilled in the object to be inspected,
2.5 of the radius of the hole with two resistance wire strain gauges 10
They are pasted at 90 degree intervals on a circle with a radius that is twice to 3.5 times the length, and another resistance wire strain gauge 10 is pasted on the same circle at a distance of 135 degrees from each of them.
次にそれぞれの抵抗線歪みゲージを電気抵抗線
歪み計に接続して通常の手順で残留応力を測定す
る。 Next, each resistance wire strain gauge is connected to an electrical resistance wire strain meter and the residual stress is measured in the usual manner.
なお上記実施例では３つの抵抗線歪みゲージを
用いているが、４つの抵抗線歪みゲージを用いれ
ばより残留応力の測定精度が向上する。この場合
には上記実施例で配置した３つの抵抗線歪みゲー
ジの他に１つの抵抗線歪みゲージ２０を最初に貼
着した抵抗線歪みゲージに対して３番目の抵抗線
歪みゲージ方向に45度離れた位置に貼着する。こ
のように配置すると精度よくゲージパターンの中
央に孔をあけることが困難な場合に、孔の位置ず
れを補正することができることになる。 Although three resistance wire strain gauges are used in the above embodiment, the measurement accuracy of residual stress can be further improved by using four resistance wire strain gauges. In this case, in addition to the three resistance wire strain gauges arranged in the above embodiment, one resistance wire strain gauge 20 is placed at an angle of 45 degrees in the direction of the third resistance wire strain gauge with respect to the first resistance wire strain gauge. Paste it in a remote location. By arranging the holes in this manner, it is possible to correct the positional deviation of the holes when it is difficult to accurately drill holes in the center of the gauge pattern.
以上述べたように本発明によれば、被検査体に
穿設すべき孔の径に合わせたゲージ長さの抵抗線
歪みゲージを設け、その抵抗線歪みゲージを、被
検査体に設けた孔の周辺の所定位置に固着して残
留応力を測定するようにしたので、歪みの検出感
度を高め得るとともにドリル加工による塑性変形
の影響を小さくし得、したがつて精度の高い残留
応力の測定が可能となるという効果を奏する。 As described above, according to the present invention, a resistance wire strain gauge is provided with a gauge length matching the diameter of the hole to be drilled in the object to be inspected, and the resistance wire strain gauge is inserted into the hole formed in the object to be inspected. Since the residual stress is measured by fixing it at a predetermined position around the surface, it is possible to increase the sensitivity of strain detection and to reduce the influence of plastic deformation caused by drilling, which makes it possible to measure residual stress with high accuracy. This has the effect of making it possible.
第１図は従来の孔あけ残留応力測定法に用いら
れている歪みゲージパターンを示す図、第２図は
円孔近傍の応力集中を示す図、第３図は本発明に
よる残留応力測定方法における歪みゲージパター
ンを示す図、第４図は歪み検出感度とドリル孔あ
け加工による誤差率を示す図である。
１０……抵抗線歪みゲージ、１１……被検査
体、１２……孔。
Figure 1 shows the strain gauge pattern used in the conventional drilling residual stress measurement method, Figure 2 shows the stress concentration near the circular hole, and Figure 3 shows the strain gauge pattern used in the conventional drilling residual stress measurement method. FIG. 4 is a diagram showing the strain gauge pattern, and is a diagram showing the strain detection sensitivity and the error rate due to drilling. 10... Resistance wire strain gauge, 11... Test object, 12... Hole.
Claims (1)
とした抵抗線歪みゲージを設け、その抵抗線歪み
ゲージを被検査体の孔中心から半径方向に孔半径
の2.5倍から3.5倍離れた位置に固着し、抵抗線歪
みゲージの信号を計測装置で検出するようにした
ことを特徴とする残留応力の測定方法。1. Install a resistance wire strain gauge whose gauge length is 1/2 or less of the radius of the hole in the object to be inspected, and extend the resistance wire strain gauge from 2.5 times to 3.5 times the hole radius in the radial direction from the center of the hole in the object to be inspected. A method for measuring residual stress, characterized in that the signal from a resistance wire strain gauge is detected by a measuring device, which is fixed at a distant position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6042481A JPS57175233A (en) | 1981-04-21 | 1981-04-21 | Measuring method of residual stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6042481A JPS57175233A (en) | 1981-04-21 | 1981-04-21 | Measuring method of residual stress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57175233A JPS57175233A (en) | 1982-10-28 |
| JPS634654B2 true JPS634654B2 (en) | 1988-01-29 |
Family
ID=13141811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6042481A Granted JPS57175233A (en) | 1981-04-21 | 1981-04-21 | Measuring method of residual stress |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57175233A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243335A (en) * | 2009-04-06 | 2010-10-28 | Polyplastics Co | Residual stress calculation method and residual stress distribution derivation method |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59230131A (en) * | 1983-06-13 | 1984-12-24 | Tokyo Electric Co Ltd | Load cell |
| DE3769789D1 (en) * | 1987-02-11 | 1991-06-06 | Kistler Instrumente Ag | METHOD AND ARRANGEMENT FOR MEASURING PRESSURES IN TUBULAR BODIES. |
| US4813278A (en) * | 1988-03-23 | 1989-03-21 | Director-General Of Agency Of Industrial Science And Technology | Method of determining three-dimensional tectonic stresses |
| CZ302108B6 (en) * | 2006-11-23 | 2010-10-20 | CVUT v Praze, Fakulta strojní | Semiconductor strain gauge drilling rose |
| DE102007056443B3 (en) * | 2007-11-23 | 2009-05-07 | Hottinger Baldwin Messtechnik Gmbh | Strain gauge rosette for residual stress measurement |
| CN102162755B (en) * | 2010-12-17 | 2014-08-20 | 罗键 | Method for detecting residual stress based on inverse problem |
| CN104897320A (en) * | 2015-06-16 | 2015-09-09 | 黄小莲 | Method for measuring welding residual stress |
| CN105397134B (en) * | 2015-06-19 | 2017-11-17 | 中南大学 | A kind of drilling equipment of Blind Hole Technique for Measuring residual stress |
| CN105067167B (en) * | 2015-09-24 | 2017-08-04 | 桂林电子科技大学 | A kind of method of use Blind Hole Method testing large ram for machine tool residual stress of casting distribution |
| CN110736577A (en) * | 2019-10-23 | 2020-01-31 | 江苏科技大学 | method for measuring surface stress distribution rule of marine diesel engine body |
-
1981
- 1981-04-21 JP JP6042481A patent/JPS57175233A/en active Granted
Non-Patent Citations (1)
| Title |
|---|
| MEASUREMENT OF RESIDUAL STRESSES BY BLIND HOLE DRILLING METHOD=1971 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243335A (en) * | 2009-04-06 | 2010-10-28 | Polyplastics Co | Residual stress calculation method and residual stress distribution derivation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57175233A (en) | 1982-10-28 |
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