Isogai Takeshi Laboratory

In terms of education, this laboratory has 1st year mechanical materials science 1, industrial mechanics, 2nd and 3rd year of materials 1-3, 3rd year mechanical engineering experiments 1 and 2, and mechanical engineering training. , I am in charge of material strength studies. In Graduate School, I am also in charge of nano-microscopic fusion material strength studies.
There are various causes of accidents during operation / use of equipment, but in order to prevent such accidents and design and manufacture safe equipment and structures that can be used with peace of mind, the strength and destruction of materials It is very important to acquire the knowledge and way of thinking about.
In this laboratory, as a graduation research, we will conduct experiments and analyzes on material strength to learn approaches to problems related to strength and fracture, which are indispensable as mechanical engineers.

Study on fatigue resistance reliability of heat-resistant materials under combined stress
In high temperature equipment such as jet engines, there are members to which combined stress such as bending and twisting is applied during operation. In this theme, we will conduct a fatigue test at high temperature under the condition that tension and shear are applied at the same time, and examine the prediction method of "how long can it be used?" (Life) required for equipment design. In addition, we will conduct computer analysis by the finite element method under the same conditions, and consider the mechanism of "fatigue" fracture in which members etc. are fractured by repeated loading in the case of combined stress.

Research on electrical crack length measurement method
In high temperature equipment, it is a big problem in maintenance management that defects and cracks occur and grow in parts during operation. In high temperature crack growth tests, which are conducted to collect basic data on this issue, it is extremely difficult to directly observe and measure the test material during the test. Therefore, a method (electric potential method) is used to measure the crack length by utilizing the property that the electrical resistance of the member increases as the cracks and defects inside the material increase. In this study, we will conduct an experimental and analytical study with the aim of constructing an electrical crack length measurement method that can be applied to tests under multiaxial and combined stress conditions.

Research on application of biomimetics to strength of materials
In recent years, the field of "biomimetics", which applies the excellent properties of animals and plants in the natural world to engineering, has been attracting attention. An example of application in this field is that the leading car of the Shinkansen train is shaped like a kingfisher's beak to reduce air resistance when entering a tunnel and reduce noise. In this study, we will experimentally examine the strength characteristics of bamboo, which is a familiar natural material, for the purpose of examining the application of biomimetics to the strength of materials. Bamboo is known to be mechanically elastic and tough, so it is expected that it will be applied to the development of new materials by elucidating its strength development mechanism.

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Introduction of Takeshi Isogai