Experimental studies on distribution of energy release rate among branch cracks in rapid crack bifurcation

• Project/Area Number: 24560097
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Toyohashi University of Technology
• Principal Investigator: SUZUKI Shinichi 豊橋技術科学大学, 工学(系)研究科(研究院), 教授 (60135415)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥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)
• 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

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.

Research Products

• [Journal Article] 光線追跡法によるPMMA平板中の残留応力測定 (2015)
  • Author(s): 鈴 木 新 一，西 川 昌 志，田 村 慶 太
  • Journal Title: 実験力学 Volume: 15
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] PMMAの破壊靱性値の分子量依存性に関する実験的研究 (2015)
  • Author(s): 坂真一，小林岳史，山本大喜，鈴木新一
  • Organizer: 日本機械学会東海支部第64期総会・講演会
  • Place of Presentation: 春日市，愛知県
  • Year and Date: 2015-03-13 – 2015-03-14
• [Presentation] 光干渉法による高速分岐き裂の動的応力拡大係数測定 (2015)
  • Author(s): 鈴木新一，征矢祐彦，中出貴裕，沼田喜弥
  • Organizer: 日本機械学会東海支部第64期総会・講演会
  • Place of Presentation: 春日市、愛知県
  • Year and Date: 2015-03-13 – 2015-03-14
• [Presentation] 高速多重分岐き裂の撮影を目的としたパルスホログラフィ光学系の構築 (2014)
  • Author(s): 征矢祐彦、中出貴裕、鈴木新一
  • Organizer: 日本材料学会第11回衝撃問題シンポジウム
  • Place of Presentation: 豊橋，愛知県
  • Year and Date: 2014-11-29 – 2014-11-30
• [Presentation] 分岐切欠先端から発生するき裂の進展角測定 (2014)
  • Author(s): 岩崎裕介， 鈴木新一
  • Organizer: 日本材料学会第11回衝撃問題シンポジウム
  • Place of Presentation: 豊橋，愛知県
  • Year and Date: 2014-11-29 – 2014-11-30
• [Presentation] 高速多重分岐き裂の実験に使用する試験片と破壊実験 (2014)
  • Author(s): 宮川穣，前田生進，鈴木新一
  • Organizer: 日本材料学会第11回衝撃問題シンポジウム
  • Place of Presentation: 豊橋，愛知県
  • Year and Date: 2014-11-29 – 2014-11-30
• [Presentation] 高速多重分岐き裂へのコースティック法の適用 (2014)
  • Author(s): 前田生進，宮川穣，鈴木新一
  • Organizer: 日本材料学会第11回衝撃問題シンポジウム
  • Place of Presentation: 豊橋，愛知県
  • Year and Date: 2014-11-29 – 2014-11-30
• [Presentation] レーザーを用いた非破壊法によるアクリル板内の残留応力推定 (2014)
  • Author(s): 西 川 昌 志，田 村 慶 太，鈴 木 新 一
  • Organizer: 日本実験力学会2014年度年次大会
  • Place of Presentation: 姫路市，兵庫県
  • Year and Date: 2014-08-28 – 2014-08-30
• [Presentation] コースティック法を用いた混合モード応力拡大係数測定における測定精度について (2014)
  • Author(s): 藤島達也，清水康伸，鈴木新一
  • Organizer: 日本実験力学会2014年度年次大会
  • Place of Presentation: 姫路市，兵庫県
  • Year and Date: 2014-08-28 – 2014-08-30
• [Presentation] 高速分岐き裂の応力拡大係数測定への外挿法の適用 (2014)
  • Author(s): 鈴 木 新 一, 石 田 鉄 平, 坂 真 一, 坂 上 賢 一
  • Organizer: 日本実験力学会2014年度年次大会
  • Place of Presentation: 姫路市，兵庫県
  • Year and Date: 2014-08-28
• [Presentation] Measurement of Crack Opening Displacement of Through Branch Cracks of a Rapidly Bifurcating Crack (2014)
  • Author(s): Shinichi Suzuki, Kenichi Sakaue, Teppei Ishida and Shinichi Saka
  • Organizer: 16th International Conference on Experimental Mechanics
  • Place of Presentation: Cambridge, UK
  • Year and Date: 2014-07-07 – 2014-07-11
• [Presentation] Effect of virtual crack tip position on measurement of stress intensity factor of a notch by Moire interferometry (2014)
  • Author(s): Shinichi Suzuki, Muhd Haniff Hadi Bin Mohd Salamun, Shin Tanaka, Tomotaka Miyashita
  • Organizer: International Conference on Computational & Experimental Engineering and Sciences (ICCES'14)
  • Place of Presentation: Changwon, Korea
  • Year and Date: 2014-06-12 – 2014-06-17
• [Presentation] Effect of Virtual Crack Tip Position on Measurement of Stress Intensity Factor of a Notch by Moire Interferometry (2014)
  • Author(s): Shinichi Suzuki, Muhd Haniff Hadi, Shin Tanaka, Tomotaka Miyashita
  • Organizer: International Conference on Computational & Experimental Engineering and Sciences
  • Place of Presentation: Changwon, Korea
• [Presentation] Measurement of Crack Opening Displacement of Through Branch Cracks of a Rapidly Bifurcating Crack (2014)
  • Author(s): Shinichi Suzuki, Kenichi Sakaue, Teppei Ishida, Shinichi Saka
  • Organizer: The 16th International Conference on Experimental Mechanics
  • Place of Presentation: Cambridge, UK
• [Presentation] 十分発達した高速分岐き裂における枝き裂のエネルギー解放率測定 (2013)
  • Author(s): 佐 藤 岳 博，征 矢 祐 彦，坂 上 賢 一，鈴 木 新 一
  • Organizer: 日本実験力学会2013年次大会
  • Place of Presentation: 由利本荘市文化交流館「カダーレ」
• [Presentation] 分岐切欠先端から発生するき裂の進展方向とき裂先端応力場の測定 (2013)
  • Author(s): 屋 保 孝 洋， 岩 崎 裕 介， 藤 島 達 也， 鈴 木 新 一
  • Organizer: 日本実験力学会2013年次大会
  • Place of Presentation: 由利本荘市文化交流館「カダーレ」
• [Presentation] Measurement of Energy Release Rate of a Branch Crack in PMMA Immediately after Rapid Crack Bifurcation - In the Case that COD of the Branch Crack is Proportional to √r (2013)
  • Author(s): Shinichi. Suzuki, Kenichi. Sakaue and Masahiro. Koujiba
  • Organizer: The 9th International Conference on Advances in Experimental Mechanics (Cardiff, UK)
  • Place of Presentation: カーディフ大学，イギリス
• [Presentation] Measurement of Crack Direction and Stress Field at Bifurcated Notch Tip (2013)
  • Author(s): Shinichi Suzuki, Takahiro Yabo, Tatsuya Fujishima, Yusuke Iwasaki
  • Organizer: The 30th Danubia-Adria Symposium on Experimental Mechanics
  • Place of Presentation: ホテルゾラ，プリモシュテン，クロアチア
• [Presentation] き裂先端に発生する三次元応力場が開口変位に及ぼす影響 (2013)
  • Author(s): Muhd Haniff Hadi，宮下友貴，鈴木新一
  • Organizer: 日本機械学会 M&M2013材料力学カンファレンス
  • Place of Presentation: 岐阜大学
• [Presentation] 平板試験片の両面同時撮影による高速分岐き裂の応力拡大係数測定 (2013)
  • Author(s): 石田鉄平，坂上賢一, 鈴木新一
  • Organizer: 日本機械学会 M&M2013材料力学カンファレンス
  • Place of Presentation: 岐阜大学
• [Presentation] 平板中の切欠における開口変位の数値解析 (2013)
  • Author(s): 田中信，感本広文，鈴木新一
  • Organizer: 日本機械学会 M&M2013材料力学カンファレンス
  • Place of Presentation: 岐阜大学
• [Presentation] コースティック法を用いた混合モード応力拡大係数測定に及ぼす3次元応力場の影響 (2013)
  • Author(s): 藤島達也， 岩崎裕介， 征矢祐彦， 鈴木新一
  • Organizer: 日本機械学会 M&M2013材料力学カンファレンス
  • Place of Presentation: 岐阜大学
• [Presentation] Measurement of Crack Direction and Stress Field at Bifurcated Notch Tip (2013)
  • Author(s): Shinichi Suzuki, Takahiro Yabo, Tatsuya Fujishima, Yusuke Iwasaki
  • Organizer: The 30th Danubia-Adria Symposium on Experimental Mechanics
  • Place of Presentation: Primosten, Croatia
• [Presentation] 平板試験片中における分岐切欠の開口変異と応力拡大係数測定：切欠長さが6mmの場合 (2012)
  • Author(s): 鈴木新一，Muhamad Faiz Bin Jaafar Zahri, Muhd Haniff Hadi Bin Mohd Saramun
  • Organizer: 日本実験力学会2012年度年次講演会
  • Place of Presentation: 豊橋技術科学大学，豊橋市、愛知県
• [Presentation] ホマライト100中の高速分岐き裂における枝き裂間のエネルギー解放率配分：ひとつの枝き裂のCODが√rに比例する場合 (2012)
  • Author(s): 鈴木新一，麹場正洋，坂上賢一
  • Organizer: 日本実験力学会2012年度年次講演会
  • Place of Presentation: 豊橋技術科学大学，豊橋市、愛知県
• [Presentation] Photoelastic Measurement of Residual Stress of Light Bulbs for Automobiles with Lighting (2012)
  • Author(s): Shinichi Suzuki, Taiga Murai, Shouhei Nishikita, Youta Katayama
  • Organizer: The 15th International Conference on Experimental Mechanics
  • Place of Presentation: Porto, Portugal