| Budget Amount *help |
¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
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| Outline of Final Research Achievements |
Densely packed colloidal suspension, called paste, remembers the direction of mechanical motion, such as vibration and flow, and, if the paste is dried, its memory is visualized as the direction of crack propagation. In this project, we tried to reveal the mechanism of memory effect of paste and applied the memory effect to control crack formation.
We found that the attractive force between particles is necessary for the memory of flow. Magnetic paste remembers the direction of the magnetic field and the desiccation cracks run along the magnetic field. By applying a vertical vibration to the paste, we came to control the position of crack formation by localizing the area of horizontal vibration. Finally, we succeeded in erasing the memory of external field in paste by applying ultrasonic waves to the paste. As the paste becomes more homogeneous, irradiation of ultrasonic waves to a paste increases the breaking strength of the paste.
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