FRACTAL STRUCTURES ALONG DIFFERENT DIRECTIONS OF FRACTURED SURFACES
断裂表面不同方向的分形结构

The vertical section method is employed to measure fractal dimensions ofcross section profile of fractured surfaces under plane strain conditions.It is shown that thevertical section method could describe further the roughness of fractured surfaces as com-pared with slit island method.The fractal dimensions of fracture Koch curve along the di-rection of crack propagation D_1 are different from that,perpendicular to the direction ofcrack propagation D_2 A positive linear correlation between the fractal dimension D_1 and1g K_(lc)is obtained.A negative linear correlation between fractal dimension D_2 and 1gK_(1c)isobtained.However,the correlation between(D_1+D_2)and log K_(1c)is a positive linear one.The reason why the fractal D_1 and D_2 are different is discussed.