| 摘要 |
PURPOSE: An apparatus for measuring fatigue fracture toughness of metal material is provided to stably test fatigue fracture toughness of metal material under the high temperature of 500°C to 900°C. CONSTITUTION: An apparatus for measuring fatigue fracture toughness of metal material includes a refractory furnace having a test piece(21) of a metal material inside and heating elements(22) for heating the metal material at a predetermined temperature; a load granting element(24) applying predetermined repetitive stress to a part where a fracture(21a) is generated to make tough fracture formed at the metal material; and a measuring element formed with a hollow case(25b), a measuring part(25) having a coil(25a) wound on an iron core(25c) formed at the hollow portion of the case for forming magnetic field around fracture part of the metal material, and a driving part(26) moving the measuring part to the metal material in a predetermined direction.
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