Nobuo Nagashima

Title: Innovations by Nobuo Nagashima: Pioneering Ultra Micro Indentation Testing

Introduction

Nobuo Nagashima, an accomplished inventor based in Ibaraki, Japan, has made significant contributions to the field of materials testing through his innovative inventions. With a total of two patents to his name, he has developed state-of-the-art apparatuses and methods that enhance the understanding of material properties on a micro scale.

Latest Patents

Nagashima's latest patents include the "Ultra Micro Indentation Testing Apparatus" and a "Method of Testing Hardness of Micro Region." The ultra micro indentation testing apparatus is designed with a lever stand that houses a silicon probe and a diamond indenter. This apparatus features a moving mechanism allowing for triaxial movement, an indentation mechanism for exerting force on a sample, a displacement gauge for precise measurements, and an optical device for observing the sample surface. By combining hardness measurement, atomic force microscopy, and optical microscopy capabilities, this apparatus achieves high accuracy in assessing material properties in ultra micro regions.

The method developed for testing hardness involves utilizing indentation curves that illustrate the relationship between penetration depths and indenting forces when a uniquely shaped indenter is applied to standard samples. This systematic approach not only establishes a reference function indicative of macro hardness but also enables the determination of micro-region hardness from measured values against this reference.

Career Highlights

Throughout his career, Nagashima has worked with various organizations, including the National Research Institute for Metals in Japan, contributing his expertise and furthering the development of material testing technologies. His work has laid the groundwork for advancements in the understanding of material properties on a small scale, essential for numerous applications in engineering and manufacturing.

Collaborations

Collaboration has played a vital role in Nagashima's achievements. He has worked alongside notable colleagues, including Kensuke Miyahara and Saburo Matsuoka. These partnerships have fostered a rich exchange of ideas, enhancing the innovation process and leading to the successful development of his patents.

Conclusion

Nobuo Nagashima's contributions to micro indentation testing represent a significant leap in material science. His patented inventions are not only a testament to his ingenuity as an inventor but also serve as vital tools for researchers and industries seeking to understand and utilize material properties more effectively. As technology continues to evolve, Nagashima’s work will undoubtedly remain influential in the realms of innovation and material testing.