JPH0415508A - Quantitative measuring method for corrosion and moisture in metallic structure member - Google Patents
Quantitative measuring method for corrosion and moisture in metallic structure memberInfo
- Publication number
- JPH0415508A JPH0415508A JP2117633A JP11763390A JPH0415508A JP H0415508 A JPH0415508 A JP H0415508A JP 2117633 A JP2117633 A JP 2117633A JP 11763390 A JP11763390 A JP 11763390A JP H0415508 A JPH0415508 A JP H0415508A
- Authority
- JP
- Japan
- Prior art keywords
- moisture
- corrosion
- film
- neutron
- honeycomb
- 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.)
- Pending
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 23
- 230000007797 corrosion Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 11
- 239000004698 Polyethylene Substances 0.000 claims abstract description 16
- -1 polyethylene Polymers 0.000 claims abstract description 16
- 229920000573 polyethylene Polymers 0.000 claims abstract description 16
- 238000002601 radiography Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000011888 foil Substances 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 2
- 230000013011 mating Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 241000264877 Hippospongia communis Species 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 241000257465 Echinoidea Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Landscapes
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は航空機等の多層構造部材の合せ面の腐食若しく
はハニカム接着構造部材のハニカムに浸入した水分の定
量計測方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for quantitatively measuring corrosion of mating surfaces of multilayer structural members such as aircraft or moisture infiltrating into honeycombs of honeycomb bonded structural members.
航空機等の腐食及びハニカム中の水分を早期に検出する
には、従来のＸ線またはＴ線うジオグラフィ法よりも熱
中性子を用いた中性子ラジオグラフィ法が有効であると
されているが、ＡＩ材の腐食及びハニカム中の水分の定
量計測方法は確立されていなかった。Neutron radiography using thermal neutrons is said to be more effective than conventional X-ray or T-ray radiography for early detection of corrosion in aircraft and moisture in honeycombs, but AI A quantitative measurement method for material corrosion and moisture content in honeycombs had not been established.
中性子ラジオグラフィ法で航空機等ＡＩ材の腐食及びハ
ニカム中の水分の検出は従来定性検出であり、定量的計
測は不可能であった。Conventionally, detection of corrosion in AI materials such as aircraft and moisture in honeycombs using neutron radiography was a qualitative detection, and quantitative measurement was not possible.
そこで、本発明は従来法がもつ問題点を解消し、Ａ１腐
食及びハニカム中の水分の定量的計測技術を提供するこ
とを目的とする。Therefore, an object of the present invention is to solve the problems of the conventional methods and provide a technique for quantitatively measuring A1 corrosion and moisture in a honeycomb.
本発明は外板、縦通材及び金具等をファスナで結合した
多層構造部材、若しくは、ハニカム接着構造部材内の腐
食並びに水分を中性子ラジオグラフィ法により定量的に
計測する方法において、ポリエチレン製シートの端部を
露出させて階段状に積層したステップウエッジインジケ
タを被検体表面の一部に置き、被検体の裏面に変換箔を
介してフィルムを装着した後、中性子ビームを照射して
フィルム上に中性子ラジオグラフィ像及びインジケータ
像を写し、両像を対比することを特徴とする構造部材内
の腐食並びに水分の定量計測方法である。The present invention is a method for quantitatively measuring corrosion and moisture in a multilayer structure member in which skin panels, stringers, metal fittings, etc. are connected with fasteners, or a honeycomb bonded structure member using neutron radiography. A step wedge indicator, which is stacked in a stepped manner with the end exposed, is placed on a part of the surface of the test object, and a film is attached to the back side of the test object via a conversion foil, and then a neutron beam is irradiated to place the film on the film. This is a method for quantitatively measuring corrosion and moisture in a structural member, which is characterized by copying a neutron radiography image and an indicator image and comparing the two images.
本発明は、熱中性子をよく吸収するポリエチレン製シー
トを段階状に積層した厚さ２０〜２０００μｍ程度のス
テップウニジインジケータを用い、航空機等のＡＩ材の
腐食生成物（ＡＩ（ＤＨ）３ 、 ＡＩ［１（０１１）
など）並びに水と等価のポリエチレンシート厚さの相関
から、実際の腐食生成物層並びに水分を定量するもので
、中性子を照射して得たＮ−Ｒａｙフィルムの中性子ラ
ジオグラフィ像の濃度と等価のステップウェッジ厚さか
ら、腐食生成物層並びに水分を推定するものである。The present invention uses a step sea urchin indicator with a thickness of about 20 to 2000 μm, which is made by layering polyethylene sheets that absorb thermal neutrons in a stepwise manner, to detect corrosion products of AI materials (AI(DH)3, AI [1 (011)
This method is used to quantify the actual corrosion product layer and moisture based on the correlation between the thickness of the polyethylene sheet equivalent to water (e.g.) and the thickness of the polyethylene sheet equivalent to water. The corrosion product layer and moisture are estimated from the step wedge thickness.
以下、本発明の実施例を第１図及び第２図を用いて説明
する。Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.
第１図は、本発明の中性子ラジオグラフィ法による定量
計測方法の説明図である。多層構造部材の合せ面１２に
腐食若しくは水分４を含有する被検体３の表面にポリエ
チレン製ステップウェッジインジケータ５を置き、裏面
に変換箔６及びフィルム７を収納したカセツテ８を装着
する。第２図（ａ）はインジケータの平面図であり、同
（ｂ）は側面図である。ポリエチレン製シートを階段状
に積層したステップウェッジは、最小厚さ５０μｍから
最大厚さ２０００μｍまで変化させたものである。FIG. 1 is an explanatory diagram of the quantitative measurement method using the neutron radiography method of the present invention. A polyethylene step wedge indicator 5 is placed on the surface of the specimen 3 which is corroded or contains moisture 4 on the mating surface 12 of the multilayer structural member, and a cassette 8 containing a conversion foil 6 and a film 7 is attached to the back surface. FIG. 2(a) is a plan view of the indicator, and FIG. 2(b) is a side view. A step wedge in which polyethylene sheets are laminated in a stepped manner has a minimum thickness of 50 μm and a maximum thickness of 2000 μm.
次に、計測手順を説明する。Next, the measurement procedure will be explained.
第１図において、中性子源１ （原子炉、加速器、ラジ
オアイソトープの何れでも可）を用い被検体３に中性子
ビーム２を照射し、被検体上に置いたポリエチレン製の
ステップウェッジ５と腐食等（ハニカム中の水分を含む
）４による中性子ビームの減衰度合を変換箔６を介して
フィルム７に写し込みＮ−Ｒａｙフィルム１０を得る。In FIG. 1, a neutron beam 2 is irradiated onto an object 3 using a neutron source 1 (which can be a nuclear reactor, an accelerator, or a radioisotope), and a polyethylene step wedge 5 placed on the object is connected to a The degree of attenuation of the neutron beam due to water contained in the honeycomb) 4 is imprinted onto the film 7 via the conversion foil 6 to obtain an N-Ray film 10.
このＮ−Ｒａｙフィルム１０において、腐食又はハニカ
ム中の水分等によって生じた中性子ラジオグラフィ像１
１エリアのフィルム濃度と同等濃度のポリエチレン製イ
ンジケータ像９のステップ域を調査する。そこで同等濃
度のインジケタステップ域のポリエチレン厚さは判明し
ているので腐食又は水分を以下の要領で定量計測を行う
。In this N-Ray film 10, a neutron radiography image 1 generated due to corrosion or moisture in the honeycomb, etc.
The step area of the polyethylene indicator image 9 having the same density as the film density of one area is investigated. Therefore, since the thickness of polyethylene in the indicator step area with the same concentration is known, corrosion or moisture can be quantitatively measured as follows.
すなわち、■ハニカム中に浸入した水分の場合、水分〔
１１゜０〕はポリエチレン厚さと等価のため同等濃度ス
テップ域のポリエチレン厚さと同等の水分［Ｈ２Ｄ］が
ハニカム中に存在しているものと推定できる。In other words, ■ In the case of moisture that has penetrated into the honeycomb, moisture [
11°0] is equivalent to the thickness of polyethylene, so it can be estimated that water [H2D] equivalent to the thickness of polyethylene in the equivalent concentration step region exists in the honeycomb.
また、■腐食生成物（層）については、腐食中性子像と
同等濃度のステップ域のポリエチレン厚さの３倍が腐食
生成物（層）であると推定される。Regarding (2) corrosion products (layer), it is estimated that the corrosion products (layer) are three times the thickness of the polyethylene in the step region with the same concentration as the corrosion neutron image.
本発明は、上記構成を採用することにより、航空機等の
多層構造部材の合せ面の腐食及びハニカム接着構造部材
のハニカム中の水分を定量計測することを可能とした。By employing the above configuration, the present invention has made it possible to quantitatively measure the corrosion of mating surfaces of multilayer structural members such as aircraft and the moisture in the honeycomb of honeycomb bonded structural members.
第１図は本発明に係る中性子ラジオグラフィ法による定
量計測方法の説明図であり、箋２図（ａ）及び（ｂ）ポ
リエヂレンシート製ステップウェッジインジケータの平
面図及び側面図である。FIG. 1 is an explanatory diagram of the quantitative measurement method using neutron radiography according to the present invention, and FIGS. 2(a) and 2(b) are a plan view and a side view of a step wedge indicator made of polyethylene sheet.
Claims (1)
部材、若しくは、ハニカム接着構造部材内の腐食並びに
水分を中性子ラジオグラフィ法により定量的に計測する
方法において、ポリエチレン製シートの端部を露出させ
て階段状に積層したステップウェッジインジケータを被
検体表面の一部に置き、被検体の裏面に変換箔を介して
フィルムを装着した後、中性子ビームを照射してフィル
ム上に中性子ラジオグラフィ像及びインジケータ像を写
し、両像を対比することを特徴とする構造部材内の腐食
並びに水分の定量計測方法。In the method of quantitatively measuring corrosion and moisture in a multilayer structure member in which skin panels, stringers, metal fittings, etc. are joined with fasteners, or a honeycomb bonded structure member using neutron radiography, the edge of a polyethylene sheet is A step wedge indicator, which is exposed and stacked in a stepped manner, is placed on a part of the surface of the object to be examined, and a film is attached to the back side of the object via a conversion foil, and then a neutron beam is irradiated to create a neutron radiography image on the film. A method for quantitatively measuring corrosion and moisture in a structural member, the method comprising: capturing an indicator image and comparing the two images.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2117633A JPH0415508A (en) | 1990-05-09 | 1990-05-09 | Quantitative measuring method for corrosion and moisture in metallic structure member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2117633A JPH0415508A (en) | 1990-05-09 | 1990-05-09 | Quantitative measuring method for corrosion and moisture in metallic structure member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0415508A true JPH0415508A (en) | 1992-01-20 |
Family
ID=14716540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2117633A Pending JPH0415508A (en) | 1990-05-09 | 1990-05-09 | Quantitative measuring method for corrosion and moisture in metallic structure member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0415508A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019187235A1 (en) * | 2018-03-28 | 2019-10-03 | 株式会社トプコン | Non-destructive inspection method |
-
1990
- 1990-05-09 JP JP2117633A patent/JPH0415508A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019187235A1 (en) * | 2018-03-28 | 2019-10-03 | 株式会社トプコン | Non-destructive inspection method |
| JP2019174255A (en) * | 2018-03-28 | 2019-10-10 | 株式会社トプコン | Nondestructive inspection method |
| JP2022190097A (en) * | 2018-03-28 | 2022-12-22 | 株式会社トプコン | Non-destructive inspection method |
| US11609190B2 (en) | 2018-03-28 | 2023-03-21 | Topcon Corporation | Non-destructive inspection method |
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