Relationship between Fracture Toughness and Fractal Dimension of Fracture Surface of Steel |
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Authors: | Yan Su Wei-Sheng Lei |
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Affiliation: | (1) Welding Research Department, Central Iron & Steel Research Institute, No. 76 Xueyuan Nanlu, Haidian District, Beijing, 100081, P. R. China;(2) Quantronix Laser Applications Lab., 41 Research Way, East Setauket, Ny 11733, USA |
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Abstract: | The relationship between fracture toughness and fractal dimension of fracture surface was analysed based on a united fractal model of microscopic fracture modes. It was indicated that fracture toughness is a multivariant function of yield strength, microstructural length, fractal dimension of fracture surface and volume fraction of inclusions, other than a monovariant function of fractal dimension of fracture surface. This new fractal model of fracture toughness was verified to fit well with a set of experimental data of a ultrahigh strength steel with equal microstructure and grain size but different volume fraction of inclusion. |
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