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About Our Section |
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Mechanical properties of the parts of solid materials such as metals and ceramics and reducing flaws in them link directly to the safety of the system. So the development of the measuring technique of the materials and to keep reliance are among the most important subjects for the design and development divisions of industrial companies.
We supply standard for the four hardness tests, namely, Rockwell, Vickers, Shore, and Brinell, which are used frequently for the control of strength of products in manufacturing process, and for the Sharpy impact test, which measures toughness of metals against dynamic weights. We study the techniques of them for the establishment and keeping of standard, and supply them in our country. We also develop the technique for the measurement of hardness, bending strength and tensile strength of a very small portion or a thin fiber under the electron microscope. This is expected highly for the development and evaluation of materials, because it can measure directly the mechanical properties of crystals, grain boundaries and composites. Another field of our section is to measure mechanical properties of materials by measuring ultrasonic propagation in them. For example, we can obtain elasticity of materials by measuring ultrasonic velocity in them. The flaws in them will also be detected. Laser ultrasonics technique, which generates ultrasonic wave by applying high power pulsed laser wave to a solid material and detects the propagated ultrasonic wave by another laser, can measure non-contactly the mechanical properties of high temperature materials. We developed the technique against the utility materials with rough surfaces, and expect to apply it in the real situation. Thermal stress of the areas of power plants, which are exposed in high temperatures, is resulted from the difference of the thermal expansion of materials. To reveal this effect, we have been developed the measuring techniques of high temperature thermal expansion of various materials such as bulks, fibers and films. As have been explained, various measuring techniques for mechanical properties of materials are requested urgently, reflecting the needs for the materials which keep high strength under extreme conditions. We are expanding our research abilities for the measurement techniques of mechanical properties in extreme conditions and keeping high reliability, which are requested from the industry. |
