Cisalhamento direto de lastro ferroviário: modelo numérico e sua calibração
DOI:
https://doi.org/10.14195/2184-8394_155_5Palavras-chave:
Método dos elementos discretos, calibração, cisalhamento diretoResumo
Esse trabalho objetiva comparar as formas de representação, por meio de modelagem numérica computacional pelo Método dos Elementos Discretos (MED), do lastro ferroviário, quando submetido ao ensaio da caixa de cisalhamento direto. Os parâmetros de maior variabilidade na literatura são analisados: coeficiente de atrito, módulo de elasticidade e coeficiente de resistência ao rolamento. Essa análise ocorre com a finalidade de compreender como estes afetam o resultado macroscópico final da simulação de calibração, verificando-se tanto a tensão de cisalhamento quanto a variação volumétrica. Comparam-se modelos compostos por partículas esféricas e poliédricas digitalizadas, sendo possível verificar a dificuldade do modelo composto por partículas esféricas em alcançar o nível de tensão esperado, adicionalmente à variação volumétrica, não se conseguindo representar a contração inicial vista em laboratório. Por fim, foram possíveis melhores calibrações empregando-se o modelo composto por partículas poliédricas digitalizadas, que proveram melhor descrição do nível de tensão e variação volumétrica do material de lastro.
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