Any material consists of atoms or molecules. When it deforms under external loadings, no one can look over the deformation behavior both from macroscopic continuous and microscopic atomistic levels at the same time. Multiscale Modeling (MM) aims at linkage between the two viewpoints over the vast time and scale gaps. We are conducting the computational/theoretical MM of solid mechanics including the ab-initio calculations, molecular dynamics simulations and mathematical formulation based on the generalized elasticity and calculus of variation. In addition, we are also conducting nanoindentation experiments for size-dependent plastic deformation, mechanical design of flexible joint structures, and non-destructive evaluation of defects in solid by means of scanning electron-induced acoustic microscope (SEAM).
We are developing new functional materials using acoustic techniques originally developed in our laboratory and conducting research to realize an affluent society, such as the development of an ultra-sensitive hydrogen gas sensor. We are also conducting research to elucidate the mechanics and mechanisms of deformation and fracture of micro- and nano-materials, and to establish material mechanics and material strength science in micro- and nano-materials.
Establishment of computational theory and methodology of multiscale dynamics for microscopic open systems, which incorporates surrounding environmental effects to isolated systems.
Flows including solid particle are seen in a wide range of industrial equiput and in nature. It shows very complex and intriguing bahaviors due to the structure formation by particles. We perform studies to advance our understandings on the flow physics and to develop reliable numerical models. Application studies based on these fundamentals are also our scope of study.
In-situ electron microscopy with nanometer-scale manipulation technique is the powerful method to investigate mechanical properties of nanomaterials. Our research group has conducted fundamental studies on machining process, plastic deformation mechanism, wetting behavior, Gecko-like adhesive behavior and oscillation properties of carbon nanotubes (CNTs), carbon nanocoils and related materials, with utilizing transmission- and scanning- electron microscopes equipped with nanomanipulation system operated with 0.1 nm order accuracy. We also have tried to develop novel components for nanomechanical systems and functional materials with making the best use of unique and nice properties originated in the fine structures of nanocarbon materials.
Based on analytical studies of elastic wave and ultrasonic wave in solid media, new material evaluation technique and sensing technique have been developed. In particular, studies on guided wave propagating in plate-like structures range from research of new calculation technique to development of advanced non-contact vibration measurements such as laser ultrasonics and air-coupled ultrasonics.
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