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金属断裂表面的分形(Fractal)与断裂韧性

穆在勤 , 龙期威

金属学报

本文借助于图象分析技术使用Slit island方法研究了两种高强度钢不同热处理制度和不同试验温度条件下平面应变断裂表面的分形维数.结果表明,断裂表面是一种分形结构,断裂韧性K_(IC)值的对数随分形维数D_F增加成单调下降的直线关系.这种关系反映了不同热处理制度所引起的材料微观结构变化和不同试验温度所引起的断裂机制变化,D_F可以做为金属断裂韧性的一种度量。最后,用临界裂纹扩展力与不规则断裂表面真实面积之间的关系对结果进行了理论分析.

关键词: 分形维数 , fractured surface , fracture toughness , critical extension force , yardstick length

FRACTAL ANALYSIS OF IMPACT FRACTURE IN STEEL

SU Hui ZHANG Yugui YAN Zhenqi Northeast University of Technology , Shenyang , China YAN Zhenqi Professor Dept.of Materials Science and Engineering , Northeast University of Technology , Shenyang 110006 , China

金属学报(英文版)

By means of fractal analysis,the fractal dimension with relation to the impact toughness,im- pact fracture characteristics and mierostructures of steel under low temperature impact have been investigated.Experimental results show that the logarithms of impact toughness in- creases monotonically with the increase of fractal dimension.The microstruetures have a great influence on fraetal dimension.There is an appropriate correlation between fraetal dimension and fracture mechanism.

关键词: fractal dimension , null , null , null

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