S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Theses (Ph.D. / Sc.D._재료공학부)
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
- 공과대학 재료공학부
- Issue Date
- 서울대학교 대학원
- Mg alloy; Hardening deterioration; Creep; Strain-rate sensitivity; Inverse characterization method
- 학위논문 (박사)-- 서울대학교 대학원 : 재료공학부, 2015. 8. 정관수.
- The 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.