JPS56115937A - Detecting method for crack of test piece - Google Patents

Detecting method for crack of test piece

Info

Publication number
JPS56115937A
JPS56115937A JP1856780A JP1856780A JPS56115937A JP S56115937 A JPS56115937 A JP S56115937A JP 1856780 A JP1856780 A JP 1856780A JP 1856780 A JP1856780 A JP 1856780A JP S56115937 A JPS56115937 A JP S56115937A
Authority
JP
Japan
Prior art keywords
test piece
temperature
potential
difference
crack
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
Application number
JP1856780A
Other languages
Japanese (ja)
Inventor
Tsutomu Fujii
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.)
Tokyo Koki Seizosho KK
Original Assignee
Tokyo Koki Seizosho KK
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 Tokyo Koki Seizosho KK filed Critical Tokyo Koki Seizosho KK
Priority to JP1856780A priority Critical patent/JPS56115937A/en
Publication of JPS56115937A publication Critical patent/JPS56115937A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0064—Initiation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

PURPOSE:To enable accurate detection of the property of development of a crack by calculating a temperature compensation coefficient through measurement of the temperature by means of a thermocouple stuck to the test piece, by dividing the difference in potential on both sides of a notch by the coefficient and by converting the same to the difference in potential at the reference temperature. CONSTITUTION:The test piece 2 is housed in an ambience tank 9 of high temperature and high pressure and a load is applied thereto repeatedly by pull rods 6 and 7. The test piece 2 is fed with current by a power source device 3 and thereby the difference in potential V(t) on both sides of the notch 1 can be measured by potential- difference lead wires 4. The thermocouple 11 gives a voltage corresponding to the temperature of the test piece 2 to a converter 12, wherein the temperature compensation coefficient A(t) based on the temperature and quality of material of the test piece 2 is calculated and given to a divider 10. In the divider 10 a value of V(t)/A(t)=Vo is computed and thereby the difference in potential at the reference temperature to is calculated. By this method, the occurrence of the crack in the notch 1 owing to the repeated load and the degree of development thereof are recorded on a recorder 5.
JP1856780A 1980-02-19 1980-02-19 Detecting method for crack of test piece Pending JPS56115937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1856780A JPS56115937A (en) 1980-02-19 1980-02-19 Detecting method for crack of test piece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1856780A JPS56115937A (en) 1980-02-19 1980-02-19 Detecting method for crack of test piece

Publications (1)

Publication Number Publication Date
JPS56115937A true JPS56115937A (en) 1981-09-11

Family

ID=11975196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1856780A Pending JPS56115937A (en) 1980-02-19 1980-02-19 Detecting method for crack of test piece

Country Status (1)

Country Link
JP (1) JPS56115937A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60196642A (en) * 1984-03-19 1985-10-05 Univ Osaka Method for measuring internal flaw and damage utilizing computer without destruction
JPS6329748U (en) * 1986-08-12 1988-02-26
CN103760042A (en) * 2014-01-23 2014-04-30 国家电网公司 Method for measuring perimeter creep of high-temperature and high-pressure steam pipeline

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4830981A (en) * 1971-08-25 1973-04-23
US4149406A (en) * 1977-10-31 1979-04-17 Russenberger Max E Method and apparatus for determining the time dependency of the length of a fissure in a test specimen during a fracture test

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4830981A (en) * 1971-08-25 1973-04-23
US4149406A (en) * 1977-10-31 1979-04-17 Russenberger Max E Method and apparatus for determining the time dependency of the length of a fissure in a test specimen during a fracture test

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60196642A (en) * 1984-03-19 1985-10-05 Univ Osaka Method for measuring internal flaw and damage utilizing computer without destruction
JPH0412412B2 (en) * 1984-03-19 1992-03-04 Oosaka Daigakucho
JPS6329748U (en) * 1986-08-12 1988-02-26
CN103760042A (en) * 2014-01-23 2014-04-30 国家电网公司 Method for measuring perimeter creep of high-temperature and high-pressure steam pipeline

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