Clarication of fracture mechanism in front of crack tip with in-situ STM observation and molcular dynamics analysis
Grant-in-Aid for Scientific Research (A).
Materials/Mechanics of materials
|Research Institution||KYUSHU UNIVERSITY|
西谷 弘信 九州大学, 工学部, 教授 (20037708)
NOGUCHI Hiroshi Faculty of Engineering, Dept.of mechanical science and engineering, Associate Professor., 工学部, 助教授 (80164680)
ODA Yasuji Faculty of Engineering, Dept.of mechanical science and engineering, Research Ass, 工学部, 助手 (20091340)
AONO Yuuta Faculty of Engineering, Dept.of mechanical science and engineering, Research Ass, 工学部, 助手 (70264075)
|Project Fiscal Year
1993 – 1995
Completed(Fiscal Year 1995)
|Budget Amount *help
¥31,200,000 (Direct Cost : ¥31,200,000)
Fiscal Year 1995 : ¥2,800,000 (Direct Cost : ¥2,800,000)
Fiscal Year 1994 : ¥2,500,000 (Direct Cost : ¥2,500,000)
Fiscal Year 1993 : ¥25,900,000 (Direct Cost : ¥25,900,000)
|Keywords||Molcular dynamics / Fracture process zone / Scanning probe microscope / Atom / Fracture / Continuous mechanics / 分子動力学 / 破壊プロセスゾーン / 走査型プローブ顕微鏡 / 原子 / 破壊 / 連続体力学 / 破壊プロセスゾン / 走査型ブローブ顕微鏡 / 体積力学 / 主裂 / 原子間力顕微鏡 / 金属疲労 / 破壊力学|
This research consists of the following analytical project and exprimental project.
The following new method was developed for microscopic analysis of fracture.
(1) The hybrid method between molcular dynamics and continuous mechanics was proposed.
(2) Using this method, we analized a fracture process zone in front of a crcak tip under small scale yieldinbg condition. It is concluded from this method that the fracture process can be analized in level of atom behavior and a finete size structure can be analized.
The demerit of molcular dynamics was solved by using the present method.
(3) This method was applied to a trobology problem, and new results were obtained.
Fatigue process was observed with atomic force microscope.
(4) Fatigue process was clarified by obcervation of atomic force microscope and crystal analysis of etch pit method. A new model of fatigue mechanism was proposed.
Research Output (12results)