CRACK GROWTH SENSOR AND CRACK GROWTH QUANTITY MEASURING SYSTEM USED FOR ENVIRONMENTAL EVALUATION OR THE LIKE

WIPO Patent Application WO/2001/025753

A1

A crack growth sensor placed in an environment such as in a nuclear reactor to have crack growth promoted therein, wherein a sensor element that undergoes crack growth is in the form of, for example, a hollow cylinder or plate, constructed such that the sensor element is subjected to a tensile load axially applied thereto at its axially opposite ends or a torsion load applied thereto. This sensor element is formed with a crack initiation point, for example, a slit, groove or pinhole, where stress concentration occurs owing to the tensile load or torsion load. For example, a core or/and a spring having a compression load applied thereto are inserted in a cylinder that serves as the sensor element and the reaction to the compression load thereon is supported by caps attached to the opposite ends of the cylinder, thereby causing stress concentration that promotes crack growth to occur at the crack initiation point in the sensor element.

OOKIDO SHINOBU (JP)
KATOU TAKAHIKO (JP)
HATTORI SHIGEO (JP)
KANNO SATOSHI (JP)

PCT/JP1999/005380

April 12, 2001

September 30, 1999

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HITACHI LTD (JP)
OOKIDO SHINOBU (JP)
KATO TAKAHIKO (JP)
HATTORI SHIGEO (JP)
KANNO SATOSHI (JP)

G01N17/04; (IPC1-7): G01N17/04; G01N27/20; G21C17/00

JPH07248291A	1995-09-26
US4628252A	1986-12-09
US3846795A	1974-11-05
JPH07225180A	1995-08-22
JPS57136140A	1982-08-23
JPS589059A	1983-01-19
JPS62232551A	1987-10-13
JPS5714843U	1982-01-26
JPS61281937A	1986-12-12

Ogawa, Katsuo (Nihonbashi-kayabacho 2-chome Chuo-ku Tokyo, JP)

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