JPS6435357A - Deciding method for surface cracking - Google Patents

Deciding method for surface cracking

Info

Publication number
JPS6435357A
JPS6435357A JP62192453A JP19245387A JPS6435357A JP S6435357 A JPS6435357 A JP S6435357A JP 62192453 A JP62192453 A JP 62192453A JP 19245387 A JP19245387 A JP 19245387A JP S6435357 A JPS6435357 A JP S6435357A
Authority
JP
Japan
Prior art keywords
potential difference
shape
electric field
distribution
difference ratio
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.)
Granted
Application number
JP62192453A
Other languages
Japanese (ja)
Other versions
JP2601477B2 (en
Inventor
Makoto Hayashi
Masahiro Otaka
Kazuo Takaku
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62192453A priority Critical patent/JP2601477B2/en
Publication of JPS6435357A publication Critical patent/JPS6435357A/en
Application granted granted Critical
Publication of JP2601477B2 publication Critical patent/JP2601477B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE:To take an electric field analysis of an optional member shape and a defective shape automatically by employing a three-dimensional boundary fit converting method. CONSTITUTION:A measurement head 3 provided with a power feed terminal 4 connected to a DC power source 6 and a measurement terminal 5 connected to a potentiometer 7 is pressed against the surface of a structure member 1 and scanned rectangularly in an X direction and a Y direction to measure a potential difference distribution. The measured potential difference distribution is converted into a potential difference ratio distribution to calculate the length (2c) and depth (a) of a crack 2. Then basic elements are divided and the boundary fit converting method is employed to set element shapes so that the surface length of the crack is 2c and the maximum depth is (a). When initial element division is finished, an electric field is analyzed and while the element shape is varied, an electric field analysis is further taken to decide and output the cracking shape when the maximum potential difference ratio equals a measured maximum potential difference ratio as an actual cracking shape.
JP62192453A 1987-07-31 1987-07-31 Surface crack shape determination method and device Expired - Lifetime JP2601477B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62192453A JP2601477B2 (en) 1987-07-31 1987-07-31 Surface crack shape determination method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62192453A JP2601477B2 (en) 1987-07-31 1987-07-31 Surface crack shape determination method and device

Publications (2)

Publication Number Publication Date
JPS6435357A true JPS6435357A (en) 1989-02-06
JP2601477B2 JP2601477B2 (en) 1997-04-16

Family

ID=16291552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62192453A Expired - Lifetime JP2601477B2 (en) 1987-07-31 1987-07-31 Surface crack shape determination method and device

Country Status (1)

Country Link
JP (1) JP2601477B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007003436A (en) * 2005-06-27 2007-01-11 Tokyo Electric Power Co Inc:The Sensor for crack depth measuring device and crack depth measuring device
JP2012145107A (en) * 2011-01-10 2012-08-02 General Electric Co <Ge> Methods, systems and apparatus for detecting material defects in rotor blades of combustion turbine engines
US8374803B2 (en) 2006-01-31 2013-02-12 National University Corporation Okayama University Damage detection apparatus, damage detection method and recording medium
JP2019174313A (en) * 2018-03-29 2019-10-10 三菱日立パワーシステムズ株式会社 Dense crack depth measuring method using electric resistance method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61224078A (en) * 1985-03-28 1986-10-04 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Generation of definite element
JPS61237045A (en) * 1985-04-15 1986-10-22 Hitachi Ltd Defect detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61224078A (en) * 1985-03-28 1986-10-04 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Generation of definite element
JPS61237045A (en) * 1985-04-15 1986-10-22 Hitachi Ltd Defect detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007003436A (en) * 2005-06-27 2007-01-11 Tokyo Electric Power Co Inc:The Sensor for crack depth measuring device and crack depth measuring device
US8374803B2 (en) 2006-01-31 2013-02-12 National University Corporation Okayama University Damage detection apparatus, damage detection method and recording medium
JP2012145107A (en) * 2011-01-10 2012-08-02 General Electric Co <Ge> Methods, systems and apparatus for detecting material defects in rotor blades of combustion turbine engines
JP2019174313A (en) * 2018-03-29 2019-10-10 三菱日立パワーシステムズ株式会社 Dense crack depth measuring method using electric resistance method

Also Published As

Publication number Publication date
JP2601477B2 (en) 1997-04-16

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