中南大学学报（自然科学版）2012，Vol.43Issue(3)：1144-1152,9.
混凝土破坏过程的复合型界面损伤模型与数值模拟
Composite interface damage model in concrete fracture process and associated numerical simulation
摘要
Abstract
At mesoscopic scale, the concrete was regarded as a three-phase composite consisting of coarse aggregate, mortar matrix and interfacial transition zones. Regular mesh of finite element was projected on a generated random aggregate structure of concrete and different material properties were assigned to the respective elements according to element location in three phases. A composite interface damage model was established for the element including the interfacial transition zone but not located in the same material phase, which was considered as a composite element in a broader sense. Using the modified Voigt-Reuss averaging scheme, the influence of the interfacial transition zone was smeared into the composite element. The elastic constants of the composite element were defined in terms of the constitutive properties of both the adjacent materials and the interfacial transition zone as well as the geometry of the homogenized element. The Mohr-coulomb criterion with tension cutoff was utilized as damage threshold for all elements, especially for each material of the composite element. The proposed model were implemented in a FE code combined with statistical mechanics to take the heterogeneities on mesoscopic scale into consideration. Tensile and compressive uniaxial tests were simulated. The results obtained reproduce the main features of concrete behavior.关键词
细观结构/界面过渡区/损伤/单轴加载/断裂过程Key words
meso-structure/ interfacial transition zone/ damage/ uniaxial loading/ fracture process分类
建筑与水利引用本文复制引用
刘智光,陈健云..混凝土破坏过程的复合型界面损伤模型与数值模拟[J].中南大学学报（自然科学版）,2012,43(3):1144-1152,9.基金项目
国家自然科学基金重大研究计划面上资助项目(90915009) （90915009）
国家自然科学基金资助项目(50909015) （50909015）
