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A model for the dynamic fracture toughness of ductile structural steel |
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| Authors: | Hai Qiu Manabu EnokiYoshiaki Kawaguchi Teruo Kishi |
| Affiliation: | a Japan Society for the Promotion of Science, 6 Ichibancho, Chiyoda-ku, Tokyo 102-8471, Japan b Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan c National Institute for Materials Science, 1-2-1 Sengen, Tsukuba-Shi, Ibaraki 305-0047, Japan |
| Abstract: | We assume in this paper that the dynamic fracture toughness KId of ductile structural steels is dependent on void nucleation and void growth. The void nucleation-induced dynamic fracture toughness KId·n and the void growth-induced dynamic fracture toughness KId·g were obtained by modifying the void nucleation-induced and void growth-induced static fracture toughness models, respectively, considering the effect of strain rate and local temperature. By the relationship between the void nucleation-induced dynamic fracture toughness KId·n and the void growth-induced dynamic fracture toughness KId·g((KId)2=(KId·n)2+(KId·g)2) dynamic fracture toughness KId could be quantitatively evaluated. With this model the dynamic fracture toughness of two structural steels (X65 and SA440) was assessed, and the causes for the differences between the static and dynamic fracture toughness were also discussed. |
| Keywords: | Dynamic loading Strain rate Dynamic fracture toughness Ductile fracture Structural steel |
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