Grant-in-Aid for international Scientific Research
|Allocation Type||Single-year Grants |
|Research Institution||The University of Tokyo |
YAGAWA Genki Professor, Department of Nuclear Engineering, the University of Tokyo, 工学部, 教授 (40011100)
ATLURI S. N. Professor. Georgia Institute of Technology, 教授
HUTCHINSON J. Professor. Harvard University, 教授
MAYFIELD M. United States Nuclear Regulatory Commission, プロジェクト研究官
WILKOWSKI Gery. Project Manager, Structures & Mechanics Dept, Battelle, プロジェクトマネージ
YOSHIMURA Shinobu Associate Professor, Department of Nuclear Engineering, the University of Tokyo, 工学部, 助教授 (90201053)
KANTO Yasuhiro Lecturer, Department of Energy Engineering, Toyohashi University of Technology, エネルギー工学系, 講師 (60177764)
KIKUCHI Masanori Associate Professor, Department of Mechanical Engineering, Science University of, 理工学部, 助教授 (90107540)
MIYAZAKI Noriyuki Associate Professor, Department of Chemical Engineering, Kyushu University, 工学部, 助教授 (10166150)
NISHIOKA Toshihisa Associate Professor, Department of Ocean Mechanical Engineering, Kobe University, 商船学部, 助教授 (60018067)
NAKAGAKI Michihiko Professor, Department of Mechanical System Engineering, Kyushu Institute of Tech, 工学部, 教授 (90207720)
AOKI Shigeru Professor, Department of Mechanical Engineering Science, Tokyo Institute of Tech, 工学部, 教授 (90016436)
HOMMA Hiroomi Professor, Department of Energy Engineering, Toyohashi University of Technology, エネルギー工学系, 教授 (70016583)
|Project Period (FY)
1989 – 1990
Completed (Fiscal Year 1990)
|Budget Amount *help
¥9,500,000 (Direct Cost: ¥9,500,000)
Fiscal Year 1990: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1989: ¥4,500,000 (Direct Cost: ¥4,500,000)
|Keywords||ElasticーPlastic Fracture Mechanics / Inhomogeneous Materials and Structures / Crack Growth Simulation / Simple Estimation Scheme / J-integral / Near CrackーTip Parameters / Welded Materials / Finite Element Analyses|
The principal purpose of this project is to investigate the elasticーplastic crackーgrowth phenomena in inhomogeneous materials and structures, aming at the development of some estimation schemes of fracture resistance through the cooperative work between Japanese and US research consortia.
The national meetings have been held 10 times during 1989-1990 to discuss experimental and numerical works. Six researchers (G. Yagawa, S. Yoshimura, H. Homma, S. Aoki, M. Nakagaki and N. Miyazaki) have visited USA eight times to perform cooperative works and to investigate the stateーofーthe art of the field. First, the activities of this project can be summarized as follows :
S. Yoshimura visited Georgia Institute of Technology in the middle of July, 1989 and in the end of June, 1990 to perform a cooperative work on numerical analyses on elasticーplastic crack growth in inhomogeneous materials.
H. Homma visited SRI international and the University of Maryland for one month in 1989 summer to perform a coop
erative work on numerical and experimental studies on dynamic crack propagation experiments under anisothermal conditions. The fracture experiments was performed in Oak Ridge National Laboratory.
M. Nakagaki visited Georgia Institute of Technology from the middle of July to the end of Aug., 1990 to perform a cooperative work on crack growth simulation in inhomogeneous materials.
N. Miyazaki visited Battelle Columbus Laboratory from the middle of Nov. to the end of Dec., 1990 to perform a cooperative work on 2D and 3D simple estimation schemes for elasticーplastic crack growth resistance.
During these periods, Japanese researchers (G. Yagawa et al.) and US reseachers (USNRC, Oak Ridge National Lab., Battelle Columbus Lab. and Georgia Institute of Technology) have had several meetings to discuss the tasks and time schedule and to review research results in Hawaii (ASME PVP Conf., July of 1989), in California (10th SMiRT Conf., Aug. of 1989), in Atlanta (ASTM STP Conf., June of 1990), in Boston (Aug. 1990), and in Washington D. C. (Oct. 1990).
The results of this project can be summarized as follows :
(1) Through the cooperative and systematic experimental and numerical works between Japanese and US research consortia on elasticーplastic crack growth in inhomogeneous specimens, it is found that the conventional J-integral can describe quantitative behaviors of crack growth even in inhomogeneous specimens.
(2) The conventional simple estimation schemes which use loading history and a stress vs. strain relationship require a certain modification on choice of material properties.
(3) Various elasticーplastic fracture phenomena of inhomogeneous materials and structures have been surveyed through this project. Less