Temperature Dependence of Mode II Fracture Toughness
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概要
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This paper is concerned with the ductile-brittle transition behavior of steels under mode II loading. Mode II fracture tests were carried out on center-cracked thin-sheet specimens of HT 50 and S 20 C. Test temperature was changed from room temperature to -196℃. From mode II tests, it was found that the fracture appearance changed with temperature as follows : (i) in the region T < T_B, a cleavage crack initiates and extends, (ii) in the region T > T_D, a ductile crack initiates and extends, and (iii) in the region T_B ≦ T ≦ T_D, a ductile crack initiates and then extends as a brittle cleavage crack. The transition curve under mode II loading was shifted to lower temperature than that under the mode I loading condition. The direction of the cleavage crack was about 64゜inclined to the precrack. The direction of the ductile crack coincided with that of the precrack.
- 一般社団法人日本機械学会の論文
- 1990-01-15
著者
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Takamatsu Tohru
Department Of Mechanical And Control Engineering University Of Electro-communications
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Ichikawa Masahiro
Department Of Mechanical And Control Engineering The University Of Electro-communications
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