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混凝土亚临界裂纹扩展的分形效应
Fractal Effects on Subcritical Crack Growth of Concrete
【摘要】 通过三点弯曲断裂SEM试验,获得了混凝土断裂全过程的扫描电镜图像.采用分形几何方法对裂纹扩展路径进行了考查,并对获得的数据点进行了回归分析和回归结果的相关性检验,论证了裂纹亚临界扩展的分形性质,得到了细观裂纹路径的分形维数D.此外,还探讨了分维D与断裂能GF之间的关系.
【Abstract】 Based on three-point bending fracture tests with scanning electron microscope(SEM),the subcritical fracture process of concrete was photographed and analyzed.Using box-counting method,the fractality of concrete crack path was discussed on basis of the test data and the regression analysis.The results show that the concrete subcritical crack propagation behaves like fractality.The fractal dimension D of the crack path was calculated.In addition,the relation between fractal dimension D and fracture energy G_F was analyzed qualitatively.
【关键词】 混凝土;
细观试验;
亚临界裂纹扩展;
回归分析;
相关性检验;
分形;
断裂能;
【Key words】 concrete; microscopical experiments; subcritical crack growth; regression analysis; correlation tests; fractalilty; fracture energy;
【Key words】 concrete; microscopical experiments; subcritical crack growth; regression analysis; correlation tests; fractalilty; fracture energy;
【基金】 国家自然科学基金“创新群体”项目(50221402);国家自然科学基金项目(19702021,50074032,50174055)
- 【文献出处】 中国矿业大学学报 ,Journal of China University of Mining & Technology , 编辑部邮箱 ,2006年01期
- 【分类号】TU755
- 【被引频次】23
- 【下载频次】725