Materials Literature
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Machined parts of stainless steels as difficult-to-cut materials are widely used in many industries, which are transportation equipment, electrical machinery, automobile and aerospace industry. This study describes that the characteristics of machined surface by end milling and burnishing process for SUS304 austenitic…
Thesis (Ph.D.)--University of Washington, 2014
In this study, carbon fiber reinforced plastic (CFRP) composite laminates with three different stacking sequences, that is, unidirectional (UD), cross-ply (CRS) and quasi-isotropic (QIS), were fabricated together with those damping CFRP laminates with a sheet of flexible material (PIEZON) for damping enhancement inser…
Metastable beta type titanium alloys have been attracting attention in various industrial fields because of their special properties such as high specific strength, good formability, high corrosion resistance, and biocompatibility. However, plastic deformation characteristics of the titanium alloys have scarcely been…
This paper describes the crystal grain size effect of an aluminum alloy analyzed by a polycrystal plasticity FEM code the present authors have been developing. In order to analyze the crystal grain size effect, the code was modified to implement a crystal grain size effect in the initial critical resolved shear stress…
In plasma spray coating, it turned out that ingredient change of Sb-Cu-Sn alloy by evaporation of a low boiling point ingredient occurs. The optimal ingredient was obtained by adjusting materials beforehand. Furthermore, high adhesion was obtained by the structure modification from heat treatment for the coating, and…
Lotus-type porous metals with directional pores are fabricated through unidirectional solidification by adding hydrogen into the melt. Three solidification techniques are developed: a mold casting, a continuous zone melting and a continuous casting techniques. The last is the most superior with merit of controlling th…
The scattering behavior of water molecules on silicon (100) surface was investigated by the molecular beam technique. We focused on the incident energy range covering the typical translational energy that gas molecules have in room temperature condition (35 - 370 meV). The results was compared with that for graphite s…
Hollow microparticles, whose core material is in a gaseous state, have advantageous features such as thermal and acoustic insulation, and lightweight. Due to their inherent acoustic property, the biocompatible hollow microparticles of less than 5 μm are also used in medical applications (e.g., as ultrasound contrast a…
It is believed that when a liquid drop drips on the same liquid bath, a liquid drop immediately coalesces with the same liquid due to surface tension when they touch each other. But they do not sometimes. The drop can float on the liquid bath surface without coalescing. It is a surprising phenomenon considered physica…
Liquid crystals are substances with high impact technological, new substances have been discovered and the properties of these materials need to be examined. When viewed under a microscope using a polarized light source, different liquid crystal phases will appear to have distinct textures and colors. The use of digit…
The wear performance between Si_3N_4/ SiC composite plate and Si_3N_4 ball under dry conditions was investigated. The wear depth of Si_3N_4/SiC with shot-peening was shallower than that of Si_3N_4/ SiC without shot-peening in the sliding wear test under low Hertzian contact pressure. This result is achieved by the com…
The ferroelectric liquid crystals, because of their fast electro-optical response, are one of the most important classes of liquid crystals. Here, in this review, we have summarized the different electro-optical modes for ferroelectric liquid crystals. Clark-Lagerwall effect (surface stabilized ferroelectric liquid cr…
We conducted some experiments on form change of hysteresises of martensitic transformations. The results of these experiments showed that key parameters of shape memory changed depending on applied stress rate.
In high burn-up fuel subassemblies of sodium cooled fast reactor, deformation of fuel pin due to the swelling and thermal bowing may decrease local flow velocity via change of flow area in the subassembly. Therefore, it is important to developed detailed evaluation method of flow field in a wire wrapped pin bundle. In…
In order to estimate parameters of the simulation model for iron green bodies of press-ready premix consisting of Distaloy AE, 0.5 % graphite and 0.6 % Kenolube, we carried out diametrical compression tests of the iron green bodies. We prepared the iron body with densities of 6.9 g/cm^3, 7.2 g/cm^3, 7.4 g/cm^3. The pa…
The strength of the plastics varies greatly with temperature. Therefore, reduction of the meshing teeth temperature will increase the lifetime of the plastic gears. The reason to use plastic crossed helical gear in combination with metal gear is seems to reduce the increase in meshing teeth temperature due to the high…
Island-shaped self-assembled monolayer (SAM) of octadecyl-trichlorosilane was repeatedly slid by using the atomic force microscope (AFM) as a model for localized adsorption films in practical boundary friction conditions. In order to clarify the deformation and fracture behaviors of them, the shape profile and frictio…
Residual seismic performance has to be evaluated in tall buildings and important structures, such as nuclear power plant, after striking earthquakes. Because of lowering brittleness of structural materials, added plastic deformation is important material characteristic to be measured, although most non-destructive tes…
The purpose of the absorber is to reduce the energy propagated to the object when an impact occurs. However, the optimal size and material of the absorber depends on impact condition. In addition, research is not enough for the case that the deformation of the absorber is in huge strain rate. Impacting the fragment to…