Papers by Author: In Kyu Rhee

Abstract: This study examines the performance of adhesive and cohesive interfacial crack model in assessing the brittle shear behavior of reinforced concrete bridge columns. The quarter-scale reinforced concrete columns tested at the University of California at San Diego by Xiao et al. (1993) to explore the ductility of reinforced concrete columns under cyclic loading. The three columns R-1, R-3 and R-5 with different transverse reinforcement are considered for finite element failure analysis.

Abstract: There have been very few research results available for high cycle fatigue properties of SMAs. In many of the devices designed to exploit the effect of fatigue loadings, the specimen is subjected to only several thousand thermal or loading cycles. Therefore, the stability of the alloy under applied loading with high cycle fatigue becomes an important issue. Moreover, there has not been any fatigue testing in compression for SMAs. The behavior of SMAs under tension and compression may be different, which is very important for many special applications of SMAs. The present study focus on the high cycle fatigue of SMAs under compression. A new surface monitoring technique for micro-deformation and micro-strain analysis, called IIMT, is introduced. IIMT is used for monitoring the performance of SMAs under high cycle stress loading in compression. The stress-strain curves and shape memory strain output at various loading cycles were obtained, which provide valuable information for design and applications of SMAs.