準脆性材料の破壊の数値シミュレーションとAE放出挙動のフラクタル性

概要

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Fracture of an inhomogeneous material is characterized by fractal parameters. Acoustic emissions(AE) during the fracture of the material are characterized by the fractal dimension b which is the slope of the log-log frequency-energy distribution. Microcracks in the material are also characterized by the fractal dimension D_L which is the slope of log-log frequency and length distribution. To examine the relationship between the b-value and microscopic fracture behavior, a fracture simulation of inhomogeneous materials is developed using an elastic network model. This model is composed of brittle stick elements, and the inhomogeneity is provided by the distribution of the strength of these stick elements on the basis of Weibull distribution. The numerical calculations were performed for various strength distributions. First, to verify the simulation, the results of the calculations were compared with experimental results of rock from the viewpoint of the AE behavior. The comparison shows that the calculations using the elastic network model can simulate the microscopic fracture in inhomogeneous materials. Then, the simulation results indicate that the change in b-values for AE corresponds to the change in D_L-value for microcracks during the fracture.
一般社団法人日本機械学会の論文
1994-05-25