用垂直剖面法测定了30CrMnSiNi2钢在去离子水中应力腐蚀开裂断口的分形维数。结果表明,在裂纹扩展过程中裂纹尖端塑性区保持很小的条件下,应力腐蚀开裂形成的断裂表面的分形维数与断面的有效表面能密度γ_p之间有正的变化关系。在本工作试验条件下,应力腐蚀开裂过程是使断裂表面增维的过程。文中分析了失稳扩展区断裂表面的分维比紧邻的亚稳扩展区表面的分维低的原因。
Fractal dimension of different parts of two fracture surfaces created by stress corrosion cracking in a high strength steel has been investigated by means of fracture profile analysis. The results show that the fractal dimension of the fracture surface corresponding to the sub-critical propagtion zone increases as the crack propagates. Therefore the process of stress corrosion cracking is the one during which the fractal dimension of the fracture surface increases.
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