A combined continuous-discontinuous approach for failure process of quasi-brittle materials  

作　　者：CHANG XiaoLin HU Chao ZHOU Wei MA Gang ZHANG Chao 

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University

出　　处：《Science China(Technological Sciences)》2014年第3期550-559,共10页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China(973 Program)(Grant No.2013CB035901);the National Natural Science Foundation of China(Grant No.51379161);the Program for New Century Excellent Talents in University(Grant No.NCET-10-0657);the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20120141110008);the Fundamental Research Funds for the Central Universities(Grant No.2012206020207)

摘　　要：Rock,concrete and other geo-materials,due to the presence of microstructural inhomogeneity,their fracture processes and damage characteristics are associated with the distribution of micro-cracks contained in the materials.In this study,by introducing a cohesive zone model based on fracture mechanics into the framework of deformable discrete element method,a continuous-discontinuous coupling analysis approach for simulating the fracture of quasi-brittle materials is proposed.The cohesive interface elements are inserted into certain engineering or research region.It is assumed that damage and fracture occur only in the interface elements,while bulk material is modeled to be elastic.The Mohr-Coulomb criterion with tension cut-off is adopted as the damage initiation criterion,and a scalar damage variable representing damage in the material is used to describe the rate at which the material stiffness is degraded.Cracks are simulated explicitly by the failure of the interface elements.Numerical simulations are performed in order to validate the suggested method.Partial applications are also listed.The results show that this method provides a simple but effective tool for the simulation of crack initiation and propagation,and it can reflect the whole process of quasi-brittle materials from small deformation to large deformation and failure.

关 键 词：quasi-brittle materials deformable discrete elements cohesive zone model crack propagation 

分 类 号：TU528.01[建筑科学—建筑技术科学] TP273[自动化与计算机技术—检测技术与自动化装置]