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Characterization Method for Hardening and Strain-rate Sensitivity at Elevated Temperature Based on Uniaxial Tension and Creep Tests
일축 인장 시험과 크리프 시험을 통한 변형률 속도 민감성과 연화거동을 고려한 경화거동의 물성 평가법

DC Field Value Language
dc.contributor.advisor정관수-
dc.contributor.author김현기-
dc.date.accessioned2017-07-13T05:48:03Z-
dc.date.available2017-07-13T05:48:03Z-
dc.date.issued2015-08-
dc.identifier.other000000067394-
dc.identifier.urihttps://hdl.handle.net/10371/118029-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 재료공학부, 2015. 8. 정관수.-
dc.description.abstractThe characterization of hardening behavior with deterioration and strain-rate sensitivity of metals at elevated temperatures is challenging since it poses ambiguity, if only the simple tension test is utilized, in decoupling the effects of hardening deterioration and strain-rate sensitivity in the post-uniform deformation range. Therefore, an inverse characterization method involving not only the simple tension test but also the creep test was newly developed in this work and the method was applied for an Mg alloy sheet at elevated temperatures for demonstration purposes. Besides, in order to investigate the effect of material and process parameters on the creep strain behaviors, the analytical solutions, assuming the homogeneous deformation under the constant force and stress conditions, were derived and their parametric study was also conducted.-
dc.description.tableofcontents1 Introduction 1
2 Theory 6
2.1 Non-associated flow rule 6
2.2 Hill1948 yield function 10
2.3 Hardening law with softening factor 13
2.4 Strain-rate sensitivity law 16
2.5 Analytical solution for creep 26
3 Parametric Study for Creep Based on Analytical Method 33
3.1 Constant stress condition 33
3.2 Constant force condition 45
4 Basic Material Characterization 55
4.1 Uniaxial tension tests 55
4.2 Hill1948 yield and potential functions 61
4.3 Hardening behavior (up to uniform deformation limit) 64
4.4 Strain-rate and its sensitivity 67
4.5 Uniaxial creep tests 71
5 Inverse Characterization Method 75
5.1 Hardening calibration effect 75
5.2 Grip velocity calibration effect 82
5.3 Load calibration effect 91
5.4 train-rate sensitivity calibration effect1 98
6 Conclusions 107
Bibliography 108
Korean Abstract 110
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dc.formatapplication/pdf-
dc.format.extent3527270 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectMg alloy-
dc.subjectHardening deterioration-
dc.subjectCreep-
dc.subjectStrain-rate sensitivity-
dc.subjectInverse characterization method-
dc.subject.ddc620-
dc.titleCharacterization Method for Hardening and Strain-rate Sensitivity at Elevated Temperature Based on Uniaxial Tension and Creep Tests-
dc.title.alternative일축 인장 시험과 크리프 시험을 통한 변형률 속도 민감성과 연화거동을 고려한 경화거동의 물성 평가법-
dc.typeThesis-
dc.description.degreeDoctor-
dc.citation.pagesviii, 110-
dc.contributor.affiliation공과대학 재료공학부-
dc.date.awarded2015-08-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Theses (Ph.D. / Sc.D._재료공학부)
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