S24  Mecânica dos Sólidos    Titulo: MODELAGEM NUMÉRICA DO EFEITO DE ESCALA EM ESTRUTURAS DE MATERIAIS FRÁGEIS HETEROGÊNEOS   Resumo : SUMMARY. A FINITE ELEMENT MODEL FOR NONLINEAR ANALYSIS OF STRUCTURES PRONE TO BRITTLE COLLAPSE IS PRESENTED. THE MODEL INTRODUCES THE HETEROGENEITY IN SIMPLIFIED MANNER USING A THREE PHASE BASIC CELL. THE BASIC CELL CONSTITUTIVE RESPONSE IS OBTAINED WITH A STATISTICAL MODEL. SUCH A MODEL COMBINE STRESS-STRAIN RELATIONS OF EACH PHASE WITH A STRESS-STRAIN RELATION OF THE COMPOSITE SOLID. THE SIZE OF A BASIC CELL (FUNCTION OF THE STRUCTURAL SIZE) AND THE VOLUME RATIO OF THE EACH PHASE IN THE MIXTURE ARE REQUIRED INFORMATION FOR THE SIMULATION OF EQUILIBRIUM PATHS. IT IS SHOWN THAT THE EXPERIMENTAL RESULTS OF SIZE EFFECT IN THREE-POINT BENDING AND BRAZILIAN SPLIT-CYLINDER TESTS ARE SATISFACTORILY VERIFIED BY THE PROPOSED MODEL, IN A COMPUTATIONALLY EFFICIENT AND SIMPLE MANNER. KEYWORDS: BRITTLE MATERIAL, SIZE EFFECT, FINITE ELEMENTS, HETEROGENEITY     Autores : Pitangueira, Roque Luiz Rosas e Silva, Raul 0     Trabalho Completo :   COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores |  Título  dos  Trabalhos | Local