| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of finding an accurate plane strain fracture toughness value of low alloy steel such as that in a turbine rotor, using a test piece remarkably smaller than a conventional specification. SOLUTION: In this plane strain fracture toughness value determining method of finding the plane strain fracture toughness value by a fracture toughness test, a measured value K<SB>C</SB>is a value equivalent to the plane strain fracture toughness value, when a test result satisfies B≥1.0(K<SB>C</SB>/σ<SB>Y</SB>)<SP>2</SP>, where B is a thickness of the test piece, K<SB>C</SB>is the fracture toughness value measured by the fracture toughness test, andσ<SB>Y</SB>represents a yield stress or 0.2% proof stress. COPYRIGHT: (C)2006,JPO&NCIPI
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