HOME    About this site    mypage    Japanese    library    university    Feedback

University of the Ryukyus Repository >
Faculty of Engineering >
Research Report (Faculty of Engineering) >

Title :疲労き裂伝ぱ抑制機能を持つ部材の開発について
Title alternative :An improvement in the resistance ability of fatigue crack propagation in a metal
Authors :真壁, 朝敏
Authors alternative :Makabe, Chobin
Issue Date :Mar-1997
Abstract :平成7年度~平成8年度科学研究費補助金(基盤研究(C)(2))研究成果報告書
研究概要:If we can detect the crack initiation and control the crack propagation, the fracture accident owing to the metal fatigue can be reduced. Therefore, an improvement in the resistance ability of fatigue crack propagation in a metal was studied. For this purpose, the materials were machined and heat-treated by some method. One of these specimen has a groove which is cut in the loading direction. In this specimen the fatigue crack propagation was investigated when the material has a cross-section of complicated shape. The nondimensional depth of groove to the specimen thickness b/t was chosen three values, that is, b/t=0.125,0.45,0.65. The delay of crack propagation was observed in the case of b/t=0.65. Therefore, the resistance ability of fatigue crack propagation of a material can be improved, if the material was machined in a special shape. The crack propagation behavior of a local-heated specimen was investigated. This specimen was used for the substitution of a composite material. When the local-heated zone was located in front of the crack tip, the crack propagation rate was decelerated. From those results, it is found that a material can be improved in the resistance of the fatigue crack propagation, if the material is machined or heat-treated by a special technique. Also, it is expected that composite material can be designed for the purpose that the fatigue crack propagation rate is decelerated.
Type Local :研究報告書
Publisher :真壁朝敏
URI :http://hdl.handle.net/20.500.12000/12227
Appears in Collections:Research Report (Faculty of Engineering)

Files in This Item:

File Description SizeFormat
07650109.pdf表紙, はしがき8593KbAdobe PDFView/Open