Fracture mechanics in single digit nanometer scale

2017 Fiscal Year Final Research Report

• Project/Area Number: 25000012
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Engineering
• Research Institution: Kyoto University
• Principal Investigator: KITAMURA Takayuki 京都大学, 大学院工学研究科, 教授 (20169882)
• Co-Investigator(Kenkyū-buntansha): SUMIGAWA Takashi 京都大学, 大学院工学研究科, 准教授 (80403989) ; HIRAKATA Hiroyuki 京都大学, 大学院工学研究科, 教授 (40362454) ; TAKAHASHI Yoshimasa 関西大学, 工学部, 准教授 (20611122) ; SHIMADA Takahiro 京都大学, 大学院工学研究科, 准教授 (20534259)
• Project Period (FY): 2013 – 2017
• Keywords: 破壊力学 / single digit ナノスケール / 応力集中場 / き裂成長 / 連続体力学 / 離散性 / マルチフィジックス / シリコン

Outline of Final Research Achievements

We successfully develop a nanoscale experimental methodology for fracture test under the singular stress field of single digit nanometer with in situ electron-microscope observation. The experiments on cracking in a silicon single crystal clarify that the singular stress field of 4 nm still govern the fracture toughness. First-principle simulation confirms the result and, moreover, elucidates that the concept of conventional fracture mechanics breaks down at the singularity size of 2 nm (lower applicable limit).

Free Research Field

機械工学