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Discrete crack analysis for concrete structures using the hybrid-type penalty method
Yoshihiro Fujiwara,Norio Takeuchi,Tadahiko Shiomi,Atsushi Kambayashi 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.16 No.4
The hybrid-type penalty method (HPM) is suitable for representing failure phenomena occurring during the transition from continua to discontinua in materials such as concrete. Initiation and propagation of dominant cracks and branching of cracks can easily be modeled as a discrete crack. The HPM represents a discrete crack by eliminating the penalty that represents the separation of the elements at the intersection boundary. This treatment is easy because no change in the degrees of freedom for the discrete crack is necessary. In addition, it is important to evaluate the correct deformation of the continua before the crack formation is initiated. To achieve this, we implemented a constitutive model of concrete for the HPM. In this paper, we explain the implemented constitutive model and describe the simulation of an anchor bolt pullout test using the HPM demonstrating its capability for evaluating progressive failure.
Disorder in the Cubic Phase of PbHfO3 by High Energy Synchrotron Radiation Diffraction
Yoshihiro Kuroiwa,Akikatsu Sawada,Hiroshi Fujiwara,Hitoshi Kawaji,Tooru Atake 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The electron charge density distributions of PbHfO3 in the cubic phase have been investigated in association with the antiferroelectric phase transition, by analyzing high-energy synchrotronradiation powder diraction data by the maximum entropy method (MEM)/Rietveld method. The Pb atom is found to be ionic and disordered in the h100i direction. Clear covalency is observed on the Hf-O bonding. The charge density distributions around the O atom are extremely anisotropic, and are extended in the directions perpendicular to the Hf-O covalent bond. These structural characteristics are observed both at 500 K near Tc (= 476 K) and at 700 K far above Tc.
Hiroyuki Takashima,Tsuneo Takebayashi,Hiroki Shishido,Mitsunori Yoshimoto,Rui Imamura,Yoshihiro Akatsuka,Yoshinori Terashima,Hiroyoshi Fujiwara,Masateru Nagae,Toshikazu Kubo,Toshihiko Yamashita 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.1
Study Design: Prospective study based on magnetic resonance (MR) imaging of the lumbar spinal root of the intervertebral foramen. Purpose: This study was to compare MR three-dimensional (3D) sequences for the evaluation of the lumbar spinal root of the intervertebral foramen. Overview of Literature: The diagnosis of spinal disorders by MR imaging is commonly performed using two-dimensional T1- and T2-weighted images, whereas 3D MR images can be used for acquiring further detailed data using thin slices with multi-planar reconstruction. Methods: On twenty healthy volunteers, we investigated the contrast-to-noise ratio (CNR) of the lumbar spinal root of the intervertebral foramen with a 3D balanced sequence. The sequences used were the fast imaging employing steady state acquisition and the coherent oscillatory state acquisition for the manipulation of image contrast (COSMIC). COSMIC can be used with or without fat suppression (FS). We compared these sequence to determine the optimized visualization sequence for the lumbar spinal root of the intervertebral foramen. Results: For the CNR between the nerve root and the peripheral tissue, these were no significant differences between the sequences at the entry of foramen. There was a significant difference and the highest CNR was seen with COSMIC-FS for the intra- and extraforamen. Conclusions: In this study, the findings suggest that the COSMIC-FS sequences should be used for the internal or external foramen for spinal root disorders.