JP3524728B2 - Fracture surface analysis method by spatial frequency analysis - Google Patents
Fracture surface analysis method by spatial frequency analysisInfo
- Publication number
- JP3524728B2 JP3524728B2 JP25992097A JP25992097A JP3524728B2 JP 3524728 B2 JP3524728 B2 JP 3524728B2 JP 25992097 A JP25992097 A JP 25992097A JP 25992097 A JP25992097 A JP 25992097A JP 3524728 B2 JP3524728 B2 JP 3524728B2
- Authority
- JP
- Japan
- Prior art keywords
- spatial frequency
- fracture
- fracture surface
- test
- analysis
- 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 - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/04—Measuring microscopes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はき裂の破面解析方法
に関する。TECHNICAL FIELD The present invention relates to a crack surface analysis method.
【０００２】[0002]
【従来の技術】損傷事故の際には、損傷モード（疲労、
脆性・延性破壊、腐食、材料欠陥の有無等）及びき裂起
点を特定するために、破面解析が実施されている。従来
の破面解析方法は、破面を光学顕微鏡や電子顕微鏡によ
り観察を行い、定性的な判断を下すというものである。
また、ストライエーションと呼ばれる疲労によって生じ
る縞模様の間隔から、き裂進展速度や作用応力の推定を
行っている。2. Description of the Related Art A damage mode (fatigue,
Fracture surface analysis is performed to identify brittleness / ductile fracture, corrosion, presence of material defects, etc.) and crack initiation points. The conventional fracture surface analysis method is to observe the fracture surface with an optical microscope or an electron microscope to make a qualitative judgment.
In addition, the crack growth rate and working stress are estimated from the interval of the stripe pattern caused by fatigue called striation.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の技術に
は、次のような問題がある。
（１）実機の損傷破面にはストライエーションなどの特
徴的な模様が見られない場合が多い。
（２）そのため、損傷モードさえも判断を下すことが困
難となるケースが多々生じている。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。However, the conventional techniques have the following problems. (1) Characteristic patterns such as striations are often not seen on the damaged surface of the actual machine. (2) Therefore, there are many cases in which it is difficult to judge even the damage mode. The present invention aims to provide a device capable of solving these problems.
【０００４】[0004]
【課題を解決するための手段】本発明に係る空間周波数
分析による破面解析方法は、き裂破面を共焦点レーザー
顕微鏡により計測し、計測されたき裂破面形状の空間周
波数を分析して、その空間周波数特性を見いだし、前記
空間周波数特性を、実機と同一材料による疲労試験、引
張試験、破壊靭性試験、き裂伝播試験、クリープ試験か
ら得られる試験片破面の空間周波数特性と比較し、き裂
破面の損傷モードを特定する。 How fracture surface analysis by spatial frequency analysis according to the present invention According to an aspect of the can裂破surface was measured by a confocal laser over <br/> microscope, the spatial frequency of the total measured by Taki裂破surface shape to analyze, found the spatial frequency characteristics, before Symbol spatial frequency characteristics, fatigue test that by the actual and the same material, tensile test, fracture toughness test, crack propagation test, creep test or <br/> compared with the spatial frequency characteristics of the al resulting test piece fracture, crack
That identifies the damage mode of fracture surface.
【０００５】この場合、空間周波数特性は、共焦点レー
ザー顕微鏡により数値化されたき裂破面形状を、空間周
波数分析することにより、損傷モードによって異なる破
面の微視的凹凸を、その大きさ毎に抽出したものであ
る。そして、得られた空間分析周波数特性を、荷重や損
傷モードが既知な試験片の破面の周波数特性と比較する
ことにより、損傷モードや荷重（ΔＫ）などを推定す
る。 [0005] In this case, the spatial frequency characteristics, the裂破surface shape Taki be more digitized confocal les over <br/> Heather microscope, by spatial frequency analysis, microscopic different fracture by damage mode Unevenness is extracted by size.
It Its to the resulting spatial analysis frequency characteristic, by the load and failure mode are compared with the frequency characteristics of the fracture surface of the known specimens, to estimate and failure mode and load ([Delta] K)
It
【０００６】[0006]
（第１の実施の形態）本発明の第１の実施の形態を図１
〜図３に示す。図１は、空間周波数分析による破面解析
法のフローチャートを示す図。(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
~ Shown in FIG. FIG. 1 is a diagram showing a flowchart of a fracture surface analysis method by spatial frequency analysis.
【０００７】図２は、破面形状の空間周波数特性の説明
図。図３は、本発明方法による破面解析の具体例を示す
図である。図１に基づき、本発明による破面解析方法を
説明する。FIG. 2 is an explanatory view of the spatial frequency characteristic of the fracture surface shape. Figure 3 is a diagram showing a specific example of a fracture surface analysis by the onset bright method. A fracture surface analysis method according to the present invention will be described with reference to FIG.
【０００８】まず、き裂破面の微視的凹凸形状を共焦点
型レーザー顕微鏡により計測する。そして、数値化され
た破面形状を高速フーリェ変換法（以下ＦＦＴ法とい
う。ＦＦＴとはＦａｓｔ Ｆｏｕｒｉｅｒ Ｔｒａｎｓ
ｆｏｒｍ、のことをいう）等により空間周波数分析し、
その形状の空間周波数特性を見いだす。First, the microscopic concavo-convex shape of the cracked surface is measured with a confocal laser microscope. Then, the digitized fracture surface shape is referred to as a fast Fourier transform method (hereinafter, referred to as FFT method. FFT is Fast Fourier Trans).
form frequency), etc.
Find the spatial frequency characteristics of the shape.
【０００９】次に、実機と同一材料による標準的な試験
（疲労試験、引張試験、破壊靭性試験、き裂伝播試験、
クリープ試験等）から得られる試験片破面の空間周波数
特性と比較することにより、最も実機破面に近い空間周
波数特性を有する試験片破面を選別する。Next, standard tests using the same material as the actual machine (fatigue test, tensile test, fracture toughness test, crack propagation test,
By comparing with the spatial frequency characteristics of the fracture surface of the test piece obtained from the creep test, etc., the fracture surface of the test piece having the spatial frequency characteristic closest to that of the actual machine is selected.
【００１０】これより実機のき裂破面が、脆性・延性、
高・低サイクル疲労、クリープなどのどの損傷モードに
よるものかを特定することができる。また、対応する試
験片の試験条件（荷重、環境）から、実機のき裂の荷重
・環境も推定することも可能である。From this, the crack surface of the actual machine is brittle and ductile,
It is possible to specify which damage mode such as high / low cycle fatigue and creep is caused. It is also possible to estimate the load / environment of the crack of the actual machine from the test conditions (load, environment) of the corresponding test piece.
【００１１】したがって、次のように作用する。き裂が
伝播する場合、き裂先端部には必ず非弾性変形域を形成
しつつ伝播するため破面には損傷プロセスに対応したミ
クロな凹凸の痕跡が残されているものと考えられる。Therefore, it operates as follows. If the crack propagates, believed to be the fracture surface to propagate while forming a non-elastic deformation zone always the crack tip portion that have been left traces of micro uneven corresponding to the damage process of.
【００１２】図２に破面形状を空間周波数分析して得ら
れる空間周波数特性の模式図を示す。グラフの横軸は、
空間周波数（１／波長）であり、大きくなるに従い（波
長の）小さな凹凸を示している。FIG. 2 shows a schematic diagram of the spatial frequency characteristics obtained by spatial frequency analysis of the fracture surface shape. The horizontal axis of the graph is
It is a spatial frequency (1 / wavelength), and shows smaller irregularities (of wavelength) as the frequency increases.
【００１３】グラフの縦軸は、パワースペクトル密度で
あり、凹凸の高さ（波の振幅）を示している。図２か
ら、分析した破面がどのような凹凸から成るのか知るこ
とができる。The vertical axis of the graph is the power spectral density, which indicates the height of the irregularities (wave amplitude). From FIG. 2, it is possible to know what unevenness the analyzed fracture surface is made of.
【００１４】具体的には、空間周波数の小さな領域は破
面のマクロ的な凹凸や結晶粒を示し、空間周波数が大き
くなるに従い、ディンプルやストライエーションといっ
た破面模様、さらには定性的には識別不可能な、微視的
な凹凸形状を示している。[0014] Specifically, a small region of spatial frequencies shows a macroscopic unevenness and grain fracture, in accordance with the spatial frequency increases, fracture patterns such as dimples and Stora Lee ation, more qualitatively It shows a microscopic uneven shape that cannot be identified.
【００１５】図３に本発明方法による破面解析の具体例
を示す。実機のき裂破面の空間周波数分析結果と、き裂
伝播試験片および高サイクル疲労試験片の破面の空間周
波数特性を比較した場合、き裂伝播試験片に近い事が分
かる。また、最も近い空間周波数特性を示すき裂伝播試
験片の試験条件から、荷重（応力拡大係数範囲ΔＫ）を
推定することもできる。FIG. 3 shows a concrete example of fracture surface analysis by the method of the present invention. Comparing the spatial frequency analysis result of the crack surface of the actual machine and the spatial frequency characteristics of the crack surface of the crack propagation test piece and the high cycle fatigue test piece, it is found that it is close to the crack propagation test piece. Further, the load (stress intensity factor range ΔK) can be estimated from the test conditions of the crack propagation test piece showing the closest spatial frequency characteristic.
【００１６】[0016]
【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）共焦点レーザー顕微鏡により数値化されたき裂破
面形状を、空間周波数分析することにより、損傷モード
によって異なる破面の微視的凹凸を、その大きさ毎に抽
出し、
（２）得られた空間周波数特性を、荷重や損傷モードが
既知な試験片の破面の空間周波数特性と比較することに
より、損傷モードや荷重（ΔＫ）などを推定することが
出来る。Since the present invention is constructed as described above, it has the following effects. (1) a more quantified Taki裂破surface shape confocal laser microscope, by spatial frequency analysis, microscopic irregularities of different fracture by damage mode, and extracted for respective sizes, (2) The damage mode, load (ΔK), etc. can be estimated by comparing the obtained spatial frequency characteristics with the spatial frequency characteristics of the fracture surface of the test piece whose load and damage mode are known.
【図１】本発明の第１の実施の形態に係る空間周波数分
析方法による破面解析法のフローチャート。FIG. 1 is a flowchart of a fracture surface analysis method by a spatial frequency analysis method 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方法による破
面形状の空間周波数特性の説明図。FIG. 2 is an explanatory diagram of a spatial frequency characteristic of a fracture surface shape by the method 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方法による破
面解析の具体例を示す図。FIG. 3 is a diagram showing a specific example of fracture surface analysis by the method according to the first embodiment of the present invention.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−238759（ＪＰ，Ａ) 特開 平７−294451（ＪＰ，Ａ) 特開 平９−178634（ＪＰ，Ａ) 特開 平７−27635（ＪＰ，Ａ) 特開 平３−221831（ＪＰ，Ａ) 特開 昭63−96536（ＪＰ，Ａ) 特開 昭64−91002（ＪＰ，Ａ) 特開 平８−21799（ＪＰ，Ａ) 特公 昭60−34318（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) G01B 11/00 - 11/30 G01B 21/30 G01N 33/20 G01N 3/00 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-60-238759 (JP, A) JP-A-7-294451 (JP, A) JP-A-9-178634 (JP, A) JP-A-7- 27635 (JP, A) JP 3-221831 (JP, A) JP 63-96536 (JP, A) JP 64-91002 (JP, A) JP 8-21799 (JP, A) Japanese Patent Publication No. 60-34318 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) G01B 11/00-11/30 G01B 21/30 G01N 33/20 G01N 3/00
Claims (2)
測し、計 測されたき裂破面形状の空間周波数を分析して、その
空間周波数特性を見いだし、前 記空間周波数特性を、実機と同一材料による疲労試
験、引張試験、破壊靭性試験、き裂伝播試験、クリープ
試験から得られる試験片破面の空間周波数特性と比較
し、前 記き裂破面の損傷モードを特定することを特徴とする
空間周波数分析による破面解析方法。1. A-out measured裂破surface by confocal laser over microscopy analyzes the spatial frequency of the total measured by Taki裂破surface shape, finding the spatial frequency characteristic, the pre-Symbol spatial frequency characteristic, identical to the actual fatigue tests that by the material, a tensile test, fracture toughness test, cracks propagation test, compared to the spatial frequency characteristic of creep <br/> test whether we obtained test piece fracture, before Symbol crack fracture A fracture surface analysis method by spatial frequency analysis characterized by specifying a damage mode.
微鏡により数値化されたき裂破面形状を、空間周波数分
析することにより、損傷モードによって異なる破面の微
視的凹凸を、その大きさ毎に抽出したものであり、 得られた前記空間周波数特性を、荷重と損傷モードが既
知な試験片の破面の空間周波数特性と比較することを特
徴とする請求項１に記載の空間周波数分析による破面解
析方法。 2. The confocal laser microscope has the spatial frequency characteristic.
The shape of the crack fracture surface quantified by a microscope is analyzed for the spatial frequency.
By analyzing the fracture surface,
Visual irregularities are extracted for each size, and the obtained spatial frequency characteristics are used for the load and damage modes.
It is special to compare with the spatial frequency characteristics of the fracture surface of a known test piece.
Fracture solution by spatial frequency analysis according to claim 1
Analysis method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25992097A JP3524728B2 (en) | 1997-09-25 | 1997-09-25 | Fracture surface analysis method by spatial frequency analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25992097A JP3524728B2 (en) | 1997-09-25 | 1997-09-25 | Fracture surface analysis method by spatial frequency analysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11101625A JPH11101625A (en) | 1999-04-13 |
| JP3524728B2 true JP3524728B2 (en) | 2004-05-10 |
Family
ID=17340776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25992097A Expired - Fee Related JP3524728B2 (en) | 1997-09-25 | 1997-09-25 | Fracture surface analysis method by spatial frequency analysis |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3524728B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011099270A1 (en) | 2010-02-15 | 2011-08-18 | 株式会社 日立製作所 | Fracture surface analysis system and method of fracture surface analysis |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4660751B2 (en) * | 2005-03-02 | 2011-03-30 | 国立大学法人三重大学 | Method and apparatus for inspecting material containing magnetic material |
| JP4686522B2 (en) * | 2007-09-28 | 2011-05-25 | 株式会社日立製作所 | Fracture surface analysis method and apparatus |
| FR3026843B1 (en) * | 2014-10-03 | 2016-11-18 | Univ Pierre Et Marie Curie (Paris 6) | METHOD OF CHARACTERIZING THE CRACKING MECHANISM OF A MATERIAL FROM ITS BREAKING SURFACE |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6034318B2 (en) * | 1980-11-28 | 1985-08-08 | アンリツ株式会社 | image spatial frequency analyzer |
| JPS60238759A (en) * | 1984-05-14 | 1985-11-27 | Mitsubishi Heavy Ind Ltd | Method for discriminating fracture surface |
| JPS6396536A (en) * | 1986-10-14 | 1988-04-27 | Nkk Corp | Measuring instrument for fracture rate of charpy test piece |
| JPS6491002A (en) * | 1987-10-02 | 1989-04-10 | Chiyoda Chem Eng Construct Co | Three-dimensional scanning microscope |
| JPH03221831A (en) * | 1990-01-29 | 1991-09-30 | Mitsubishi Heavy Ind Ltd | Analysis of fatigue fracture surface |
| JPH0727635A (en) * | 1993-07-08 | 1995-01-31 | Mitsubishi Heavy Ind Ltd | Method for estimating acting stress from fractured surface of intergranular stress corrosion cracking |
| JPH07294451A (en) * | 1994-04-25 | 1995-11-10 | Mitsubishi Paper Mills Ltd | Application defect detecting method |
| JPH0821799A (en) * | 1994-07-08 | 1996-01-23 | Sharp Corp | Apparatus for inspecting defect |
| JPH09178634A (en) * | 1995-12-26 | 1997-07-11 | Akashi:Kk | Method and apparatus for measuring evaluating material hardness |
-
1997
- 1997-09-25 JP JP25992097A patent/JP3524728B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011099270A1 (en) | 2010-02-15 | 2011-08-18 | 株式会社 日立製作所 | Fracture surface analysis system and method of fracture surface analysis |
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| Publication number | Publication date |
|---|---|
| JPH11101625A (en) | 1999-04-13 |
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