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Corrosion Damage Assessment Method for Steel Guardrail Post Roots
Saiji Fukada,Chen Xu,Takuya Mizuno,Minobu Aoyama 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4
Steel guardrail posts are typically used on the highway system of Japan, but these can experience the corrosion damage at their root near the road surface. This damage may be particularly severe in the seaside areas or regions that experience cold weather and employ salt as a deicing agent. Therefore, this study aimed to develop a non-destructive way of estimating the extent of corrosion in the guardrail post roots. Particularly, 11 test specimens were parametrically designed to investigate the efficiency of using the impact vibration mode to assess the corrosion damage. The corrosion angle, range and thickness at the post root were the main parameters. Meanwhile, a parametric FEM analysis was executed as well to analyze the vibration behavior, the stiffness and the load-carrying capacity. In general, the study reveals that the high-order vibration modes are sensitive to the corrosion damage at the guardrail post roots, and based on this, an impact vibration method for assessing the corrosion damage was proposed.
Suzuki, Motohiro,Kim, Kab-Jin,Kim, Sanghoon,Yoshikawa, Hiroki,Tono, Takayuki,Yamada, Kihiro T.,Taniguchi, Takuya,Mizuno, Hayato,Oda, Kent,Ishibashi, Mio JAPAN SOCIETY OF APPLIED PHYSICS 2018 Applied physics express Vol.11 No.3
<P>An X-ray tomographic technique was developed to investigate the internal magnetic domain structure in a micrometer-sized ferromagnetic sample. The technique is based on a scanning hard X-ray nanoprobe using X-ray magnetic circular dichroism (XMCD). From transmission XMCD images at the Gd L-3 edge as a function of the sample rotation angle, the three-dimensional (3D) distribution of a single component of the magnetic vector in a GdFeCo microdisc was reconstructed with a spatial resolution of 360 nm, using a modified algebraic reconstruction algorithm. The method is applicable to practical magnetic materials and can be extended to 3D visualization of the magnetic domain formation process under external magnetic fields. (C) 2018 The Japan Society of Applied Physics</P>