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dc.contributor.author김효신en_US
dc.date.accessioned2014-12-01T11:46:28Z-
dc.date.available2014-12-01T11:46:28Z-
dc.date.issued2010en_US
dc.identifier.otherOAK-2014-00158en_US
dc.identifier.urihttp://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000000563535en_US
dc.identifier.urihttp://oasis.postech.ac.kr/handle/2014.oak/660-
dc.descriptionDoctoren_US
dc.description.abstractRatcheting and fatigue behavior of Inconel 718 has been investigated at 649°C under various proportional and nonproportional loading with load control. The effects of loading path, magnitude of stress amplitude and mean stress on the development of ratcheting strain have been studied over the lifetime. Ratcheting strain was measured to near failure cycles. Ratcheting occurred even under fully reversed uniaxial loading in tensile direction and torsional loading in initial loading direction. The equivalent ratcheting strain is examined for different loading paths. It is found to increase with cycles in the manner similar to the creep curve under static load. The steady-state is dominant under the loading conditions used. High ratcheting rates are found for circular paths and when the cyclic stress is in the same direction as the mean stress. The ratcheting strain at failure varies widely with test conditions and is therefore deemed not a primary life-determining factor. Both normal and shear fracture modes are observed in the range of test conditions. The examination of fracture surface and crack pattern shows that the test material tends to fail in normal mode at smaller stress amplitudes and in shear mode at larger stress amplitudes. The existing multiaxial stress-life criteria are found to be unable to correlate life data. A new fatigue criterion has been proposed based on the maximum value of the parameter given in terms of the shear stress amplitude, the normal stress excursion between the minimum and maximum shear stress points, and the maximum hydrostatic stress.en_US
dc.languagekoren_US
dc.publisher포항공과대학교en_US
dc.rightsBY_NC_NDen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.0/kren_US
dc.titleInconel 718 강재에 대한 고온 다축 반복 하중 하에서의 피로수명 예측 및 라체팅에 관한 연구en_US
dc.title.alternativeMultiaxial fatigue life prediction and ratcheting behavior of Inconel 718 at elevated temperature under axial-torsional loadingen_US
dc.typeThesisen_US
dc.contributor.college일반대학원 기계공학과en_US
dc.date.degree2010- 2en_US
dc.contributor.department포항공과대학교 기계공학과en_US

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