빙해선박용 강재의 저온특성에 관한 연구
On the Mechanical Properties at Low Temperatures for Steels of Ice-Class Vessels
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참고문헌
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초록
Tensile tests were conducted at low temperatures for the steel materials which are used for outer shell of the vessels making transit through the polar regions. The selected steel materials were GL-DH32, GL-DH36 and GL-EH36. In comparison with the results at room temperature, the yield stress increases approximately by 10 to 13 percent at -30°C and by 13 to 19 percent at -50°C while the tensile strength increases about by 9 percent at -30°C and 11 to 14 percent at -50°C. To obtain true stress-true strain, i.e. correct plastic hardening characteristics, Bridgman’s(1952) necking correction formula was introduced taking triaxial state of stresses after onset of diffuse necking into consideration. Photographs of fractured surfaces were taken by using Scanning Electron Microscope immedately after tensile tests completed and one for GL-EH36 has been presented in this paper.
Abstract
Tensile tests were conducted at low temperatures for the steel materials which are used for outer shell of the vessels making transit through the polar regions. The selected steel materials were GL-DH32, GL-DH36 and GL-EH36. In comparison with the results at room temperature, the yield stress increases approximately by 10 to 13 percent at -30°C and by 13 to 19 percent at -50°C while the tensile strength increases about by 9 percent at -30°C and 11 to 14 percent at -50°C. To obtain true stress-true strain, i.e. correct plastic hardening characteristics, Bridgman’s(1952) necking correction formula was introduced taking triaxial state of stresses after onset of diffuse necking into consideration. Photographs of fractured surfaces were taken by using Scanning Electron Microscope immedately after tensile tests completed and one for GL-EH36 has been presented in this paper.
참고문헌 (9)
- Anderson, T, "Fracture mechanics. Fundamentals & Applications" (1995), C Press
- "ASTM E646-07, Standard Test Method for Tensile Strain-Hardening Exponents(n-Values) of Metallic Steel Materials", ~ (2008)
- Bridgman, P.W, "Studies in Large Plastic Flow" (1952), McGraw Hill
- Choung, J. M., "Study on True Stress Correction from Tensile Tests", Journal of Mechanical Science and Technology, 22(6), pp.1039~1051 (2008), 대한기계학회
- 홍진한, "극저온용 스테인레스 강의 저온거동 특성", 대한조선학회 논문집, 45(5), pp.530~537 (2008), 대한조선학회
- Holloman J. H, "Tensile Deformation", Trans. AIME, 162, pp.268~ (1945)
- Choung, J. M, "Development of Elastic-Plastic Material Database Software Considering Temperature and Strain Rate Dependencies of Marine Structural Steels", pp.224~229 (2009), KOAST
- Choung, J. M, "On the Fracture Criteria of Steels for Marine Structures Subjected to Impact Loadings", 박사, pp.2007
- 이경준, "극저온 재료 성능분석을 위한 온도의존 손상모델 개발", 대한조선학회 논문집, 45(5), pp.538~546 (2008), 대한조선학회