Korea University · Engineering
Professor Yun-Jae Kim's research lab specializes in mechanical behavior and structural integrity of engineering materials and components under extreme loading conditions, with a strong focus on fracture mechanics, fatigue, and plasticity. The lab conducts advanced finite element analysis and experimental testing to evaluate the performance of materials such as austenitic stainless steel and structural components like nuclear casks, piping elbows, and offshore wind turbine foundations. Key research directions include strain-based assessment, limit load and J-integral evaluation, and the development of accurate material models for predicting failure under multi-axial stress, strain rate, and cyclic loading. The lab also contributes to code evaluation and optimization of structural design for nuclear and renewable energy applications.
Figures are computed from collected data and may differ slightly.
The present paper proposes a robust method for the Ramberg-Osgood (R-O) fit to accurately estimate elastic-plastic J from the engineering fracture mechanics analysis based on deformation plasticity. The proposal is based on engineering stress-strain data to determine the R-O parameters, instead of true stress-strain data. Moreover, for practical applications, the method is given not only for the case when full stress-strain data are available but also for the case when only yield and tensile str
Genomic analysis of Thermococcus sp. NA revealed the presence of a 3,927-base-pair (bp) family B-type DNA polymerase gene, TNA1_pol. TNA1_pol, without its intein, was overexpressed in Escherichia coli, purified using metal affinity chromatography, and characterized. TNA1_pol activity was optimal at pH 7.5 and 75 degrees C. TNA1_pol was highly thermostable, with a half-life of 3.5 h at 100 degrees C and 12.5 h at 95 degrees C. Polymerase chain reaction parameters of TNA1_pol such as error-rate, p
This paper proposes a new method to estimate failure strength of a pipe with local wall thinning. The method is based on the equivalent stress averaged over the minimum ligament in the locally wall thinned region. The highlight of the proposed method is to propose a simple scheme to estimate the equivalent stress in the minimum ligament. Inspired by the reference stress method for approximate creep stress analysis, approximate estimation equations are proposed for the equivalent stress in the mi
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