A5083992388- High-Velocity Impact and Material Behavior
- Advanced Welding Techniques Analysis
- Diamond and Carbon-based Materials Research
- Energetic Materials and Combustion
- Surface Treatment and Residual Stress
- Advanced materials and composites
- Structural Response to Dynamic Loads
- Cellular and Composite Structures
- Advanced ceramic materials synthesis
- Sensorless Control of Electric Motors
- Electric Motor Design and Analysis
- Aluminum Alloys Composites Properties
- MXene and MAX Phase Materials
- Multilevel Inverters and Converters
- Metal and Thin Film Mechanics
- Welding Techniques and Residual Stresses
- Advanced DC-DC Converters
- Intermetallics and Advanced Alloy Properties
- Aeolian processes and effects
- Magnetic Bearings and Levitation Dynamics
- GABA and Rice Research
- Fluid Dynamics Simulations and Interactions
- Electromagnetic Launch and Propulsion Technology
- Laser Material Processing Techniques
- Landslides and related hazards
Kumamoto University
2016-2025
Kumamoto Industrial Research Institute
2020-2025
Sophia University
2025
Tokyo University of Science
2024
Mitsui Engineering and Shipbuilding (Japan)
2010-2019
Yaskawa Electric (Japan)
2017
Kumamoto City Hospital
2005-2006
Sanyo (Japan)
2006
Kindai University
2006
Osaka University
2006
In this study, using a combination of several experimental and computational methods, an attempt to improve the understanding some important phenomena accompanying process explosive welding is made. The high-speed shooting was used observe formation re-entrant jet. Various methods materials characterization were estimate morphology interface, distribution liquid phase analyze evolution structure in high-velocity oblique collision. Simulating collision smoothed particles hydrodynamics (SPH)...
The mechanical response of additively manufactured sheet-based stochastic cellular materials under impact loading was investigated in this work. Samples with four different relative densities (13%, 16%, 19%, and 21%) were fabricated out 316 L stainless steel using the powder bed fusion (PBF) additive manufacturing (AM) technique. samples then tested quasi-static dynamic (impact) compressive conditions to evaluate their behavior. All analyzed showed a similar progressive plateau stress...
The catalytic activity of Group VIII transition metals except Os for methanesteam reaction under atmospheric pressure at 350∼600°C was investigated. following sequence obtained: Ru∼Rh>Ni>Ir>Pd∼Pt>>Co∼Fe.Ru and Rh were found to possess high stable over a wide range steam/methane ratio. rate on Rh-silica catalyst be the zeroth 0.5th order with respect methane steam, respectively.
Closed-cell aluminium foams were fabricated and characterised at different strain rates. Quasi-static high rate experimental compression testing was performed using a universal servo-hydraulic machine powder gun. The results show large influence of hardening on mechanical properties, which contributes to significant quasi-linear enhancement energy absorption capabilities further used for the determination critical deformation velocities validation proposed computational model. A simple model...
Four different geometries of uniform triply periodic minimal surface (TPMS) cellular structures (Diamond, Gyroid, IWP, and Primitive) a hybrid Gyroid–Diamond TPMS structure were fabricated experimentally tested under compressive strain rates ranging from quasi-static (at 0.005 s−1) to very high 11,000 s−1). Three testing apparatuses used: universal servo-hydraulic machine, direct impact Hopkinson bar (DIHB), powder gun. Limited rate hardening was observed at quasi-static, low-...
In this study, the crushing behavior of auxetic structures built from inverted tetrapods with linearly graded porosity under impact is analyzed both experimentally and computationally. The samples are fabricated Ti‐6Al‐4V alloy powder by selective electron‐beam melting method. A detailed geometrical analysis based on micro computed tomography (microCT) scans performed to determine variation strut thickness other fabrication imperfections. subjected high strain rate compression loading in two...
Silicon vacancy (SiV) color centers in diamond have attracted widespread attention owing to their stable photoluminescence (PL) with a sharp emission band the near-infrared region (ZPL 738 nm). Especially, SiV center containing single-digit nanometer-sized nanodiamonds (single-digit SiV-NDs) are desirable for various applications such as bioimaging and biosensing because of extremely small size, comparable many biomaterials. Therefore, several attempts been made fabricate SiV-NDs. However,...
In this study, the optimal parameters for weldability window of pure titanium and a new duplex stainless steel (TP 270C/SUS 821L1) were explored, particularly lower left limits. A series experiments conducted, details physical quantities during welding, such as jet, pressure, melting, obtained via smooth particle hydrodynamics (SPH) method. The simulation results demonstrated how these changed with welding near limit was determined according to experimental results, while findings. Via...
We are developing the rice powder manufacturing system using an underwater shock wave. The purpose of this study is to research a mechanism wave generation and energy efficiency by discharge in order increase observed visualization device with high speed camera, measured voltage current characteristics at same time. As result, it was clarified that countless waves were generated time water plasma expansion discharge. But, not confirmed after second peak damping oscillation. It one part...
Mg alloys are extensively used in various automotive, aerospace, and industrial applications. Their limited corrosion resistance can be enhanced by welding a thin Al plate onto the alloy surface. In this study, we perform explosive of plate, accelerated detonation an through gelatin layer as pressure-transmitting medium, two samples: Mg96Zn2Y2 containing long-period stacking ordered phase α-Mg matrix commercial AZ31. The bonding interface is characterized using optical microscopy, scanning...
Pure commercial titanium was welded with two types of stainless steel, namely SUS 304 austenitic steel and 821L1 duplex steel. The wavy interface smaller than that 304. vortex zone observed from both longitudinal transverse directions, its composition analyzed. Ti/SUS 821L11 able to bear 401–431 MPa shear load while could withstand 352–387 MPa. weldability window used analyze experimental phenomenon. Furthermore, the smoothed particle hydrodynamics (SPH) numerical simulation method simulate...
This study explores the feasibility of explosive welding to join dissimilar materials: aluminum (JIS A1050‐H24) and two cast iron types G 5501 JIS 5502), which are challenging weld due presence graphite in iron. Further, impact thickness (28, 38, 47 mm) on quality is investigated, considering microstructure mechanical behavior. Increasing correlates with a thicker local melted zone. Remarkably, investigations, novel morphology that diverges from conventional patterns observed. The interface...