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원형 튜브의 동적좌굴해석에서 동적인장물성 측정불확도의 영향 분석
정세환(S. H. Jeong),허훈(H. Huh) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
This paper is concerned with the effect of the measurement uncertainty of tensile properties on dynamic buckling analysis of a circular tube. The tensile properties of a steel sheet are measured at the strain rates ranged from 0.003/sec to 100/sec. The measurement uncertainty of the tensile properties was evaluated according to the law of uncertainty propagation considering all input quantities: the tensile load; the initial length, the thickness and width of a specimen; and the deformed length of a specimen. The effect of the uncertainty on the dynamic buckling analysis is investigated using a stochastic approach which is called Monte Carlo method. Finite element analyses of the dynamic buckling of the circular tube are conducted with random material properties which are generated according to a probability distribution identified by the measurement uncertainty. Consequently, the buckling distance and reaction force of the circular tube are statistically investigated by estimating their observed distribution and the standard deviations.
정세환(S. H. Jeong),허훈(H. Huh),이상훈(S. H. Lee),서기석(K. S. Seo),조천형(C. H. Cho) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This paper is concerned with the dynamic material properties of stainless steels. The effects of strain rate on dynamic flow stress, work hardening characteristics, strain rate sensitivity and elongation to the failure are evaluated under wide range of strain rate. Strain rate effects on the material properties are also investigated. Tensile tests are conducted with 5 kinds of stainless steels; SA-B193 B7, SA-182 F304, SA-350 LF3, SA-240 316L, SUS304. Tensile tests have been performed with the variation of strain rate from 0.001/sec to 100/sec. Quasi-static tensile tests are conducted with INSTRON tensile test machine. Tensile tests at the strain rate of 0.1/sec~100/esc are performed with HSMTM(high speed material testing machine).