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Hideyuki Kasano,Teruhiko Yoda,Kuniei Nogami,Jun Murakoshi,Naoki Toyama,Mamoru Sawada,Kentaro Arimura,Lu Guo 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.3
Tension and shear block failure is a limit state which occurs in the connection of tension steel members. The failure mechanism is a combination of tensile failure on one plane and shear failure on the perpendicular plane. The design strength equations for the tension and shear block failure are described in the well known design codes. However, they provide inconsistent levels of safety when they are used in different types of connections. In this paper, the authors survey the design strength equations in the various codes. Then, the pertinent strength equations for the gusset plates of steel truss bridges are selected. Moreover, the authors propose a pair of strength equations for compression and shear block failure for gusset plates subjected to compressive force. And to examine the applicability of proposed equations and to investigate the mechanical behavior of compression gusset plates, parametric analyses on the various thicknesses of gusset plates were conducted.
Influence of Biaxial Loads on Impact Fracture of High-Strength Membrane Materials
Kumazawa, Hisashi,Susuki, Ippei,Hasegawa, Osamu,Kasano, Hideaki The Korean Society for Composite Materials 2009 Advanced composite materials Vol.18 No.4
Impact tests on high-strength membrane materials under biaxial loads were experimentally conducted in order to evaluate influence of biaxial loads on impact fracture of the membrane materials for the inflated applications. Cruciform specimens of the membrane materials were fabricated for applying biaxial loadings during the impact test. A steel ball was shot using a compressed nitrogen gas gun, and struck the membrane specimen. Impact tests on uniaxial strip specimens were also conducted to obtain the effect of specimen configuration and boundary condition on the impact fracture. The results of the measured crack length and the ultra-high speed photographs indicate the impact fracture properties of the membrane fabrics under biaxial loadings. Crack length due to the impact increased with applied tensile load, and the impact damages of the cruciform membrane materials under biaxial loadings were smaller than those of under uniaxial loadings. Impact fracture of the strip specimen was more severe than that of the cruciform specimen due to the difference of boundary conditions.
Ordering Process in Sodium Nitrite Observed by Using Neutron Diffractometry
Hiroyuki Mashiyama,Tatsuki Miyoshi,Takanao Asahi,Hironobu Kasano,Yukio Noda,Hiroyuki Kimura 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
From neutron diffraction data, the nuclear density of sodium nitrite is guessed directly by a maximum entropy method, and is compared with the results of usual least-squares calculations. The obtained nuclear density displays that the disordered NO_2 molecule becomes partially ordered in the ferroelectric phase just below the transition temperature. However, the density distribution cannot be explained by a two-Gaussian function, which suggests that the ordering is not a classical stochastic process but a quantum tunneling in a double minima local potential.