| Budget Amount *help |
¥46,020,000 (Direct Cost: ¥35,400,000、Indirect Cost: ¥10,620,000)
Fiscal Year 2022: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2021: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2020: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Fiscal Year 2019: ¥21,450,000 (Direct Cost: ¥16,500,000、Indirect Cost: ¥4,950,000)
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| Outline of Final Research Achievements |
We investigated the fracture of fluids as an elemental process of explosive volcanic eruptions. We showed evidence against the conventional critical strain-rate criterion for brittle fracture. Brittle fractures of fluids are determined by critical stress or critical strain, similar to solid fractures. Stress rate and strain-rate acceleration are more important than strain rate. We also show that the delayed fracture regime generally exists between flow and fracture, in which brittle-like fracture is triggered by pre-existing inhomogeneity or inhomogeneity that forms during the flow.
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