10. COD and Stretched Zone as the Criterion for Fracture Initiation from a Precrack at Various Temperatures

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概要

• 論文の詳細を見る

• This paper consists of part I and part II. In part I, "Fracture Initiation from a Precrack and COD-Criterion", the effects of plastic constraint and temperatures on fracture initiation from a notch were investigated by using various types of notched specimens, at the temperatures ranging from room temperature to liquid nitrogen temperature. The results show that, when fracture initiates by fibrous crack, the COD at fibrous crack initiation is almost independent of plastic constraint of the specimens or of the test temperatures, while the COD at maximum load or at final fracture is largely dependent on them. When fracture initiates by cleavage crack, the critical COD also shows considerable dependence on those parameters above mentioned. These behaviors of critical COD are explained by the fracture mechanism in each mode of fracture. In part II, "COD-Criterion and Stretched Zone", the behavior of the stretched zone and fracture initiation at the notch root with increase of the applied load has been investigated at various temperatures. The stretched zone width is almost constant regardless of test temperatures when crack initiates by fibrous crack, while, in the case of cleavage initiation, it takes various values between the above-mentioned value and zero depending on temperature and plastic constraint. When fracture occurs with plastic COD, the critical COD at fracture is reduced by the amount of stretched zone given by the preloading, while the effect of preloading on the critical COD is small when the COD mainly consists of elastic deformation. The process of fracture initiation from the tip of 45° crack has also been investigated and it is found that the stretched zone width of 45° crack specimen is about the same as that in mode I.

• 社団法人日本船舶海洋工学会の論文

著者

• Otsuka Akio

  Nagoya University

• Nishimura Seiji

  Nagoya University

• Nishimura Seiji

  Department Of Food And Nutrition Beppu University

• Otsuka Akio

  Department Of Iron And Steel Engineering Nagoya University

• MIYATA Takashi

  Nagoya University

• MIYATA Takashi

  Department of Iron and Steel Engineering, Nagoya University

• OHASHI Makoto

  Kawasaki Steel Corp.

• KASHIWAGI Yoichiro

  Kawasaki Steel Corp.

• Miyata Takashi

  Department Of Chemistry And Materials Engineering Kansai University

• Miyata Takashi

  Department Of Biophysics Graduate School Of Sciecne Kyoto University

• Miyata Takashi

  Department Of Biophysics Faculty Of Science Kyoto University

• MIYATA Takashi

  Department of Applied Physics, Tokai University

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