Experimental studies on distribution of energy release rate among branch cracks in rapid crack bifurcation
| Project/Area Number |
24560097
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
SUZUKI Shinichi 豊橋技術科学大学, 工学(系)研究科(研究院), 教授 (60135415)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 破壊 / き裂 / エネルギー解放率 / 応力拡大係数 / 開口変異 / 衝撃工学 / 分岐 / 光計測 / Fracture / Crack / Energy release rate / Stress intensity factor / Opening displacement / Impact engineering / Bifurcation / Optical method / Energy Release Rate / Stress Intensity Factor / Opening Displacement / Impact Engineering / Optical Method |
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| Outline of Final Research Achievements |
High speed holographic microscopy was applied to take microscopic photographs of rapidly bifurcating cracks in PMMA or Homalite 100. The crack speed was more than 400m/s. On the photographs, crack opening displacement (COD) of two branch cracks was measured and energy release rates of the branch cracks were obtained from the CODs. The measurement results said that the distribution of energy release rate between the two branch cracks was 55% and 45% on the average.
Optical interferometry was also applied to the same bifurcating cracks to measure the singular stress field in the vicinity of the tips of branch cracks. The measurement of the singular stress field was also able to give the energy release rates of the two branch cracks. Each of them were 55% and 45% of the total energy release rate on the average.
The above results might say that there exists small asymmetry on the distribution of energy release rate between two branch cracks after the rapid crack bifurcation.
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Report
(4 results)
Research Products
(26 results)
