Mezzo-scopic Analysis of Fracture Toughness in Steels

Materials Research

Takashi Miyata¹  Tetsuya Tagawa¹ 

[1] ,Nagoya University Dept. of Materials Science & Engineering Nagoya,Japan

关键词: cleavage fracture toughness;    local criterion approach;    weibull stress;    formulation of toughness;    thickness effect;    deterioration of toughness;    steels;   

DOI  :  10.1590/S1516-14392002000200001

来源: SciELO

【 摘 要 】

The cleavage fracture toughness of steels was mezzo-scopically analyzed on the basis of the statistical local fracture criterion approach. The statistical stress criterion at the crack tip region suggests that the cleavage fracture toughness in steels can be described as a function of the yield stress, the cleavage fracture stress, and other mechanical properties of the materials. Formulation of the cleavage fracture toughness was first examined through an investigation on correlation between the cleavage toughness and the cleavage fracture stress obtained in notched round bar specimens in accordance with the theoretical prediction. Then, the scatter of the toughness, specimen thickness effect on the toughness, deterioration of the toughness due to cold working and irradiation, and improvement of the toughness caused by the Ni addition, were analyzed through the formulation of the toughness.

【 授权许可】

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