Modelling Time Dependent Behavior of Buried Polyethylene Pipes Using ABAQUS

Abu Hena Muntakim, Ashutosh Sutra Dhar, Auchib Reza

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Transportation Geotechnics II

ABSTRACT: Buried polyethylene pipes are increasingly used for their various advantages over the metal pipes including light-weights, ease of installation and corrosion resistance. The polymer pipe material possesses time-dependent behavior that influence the pipe-soil interaction over time. The current industry practice to account for the time-dependent effect is to use secant modulii to calculate the short-term and long-term responses. A short-term and a long-term modulus of the pipe materials are used to calculate the pipe responses independently. This method is unable to predict the continuous time -depended pipe-soil interaction and the resulting pipe responses over time. To address this limitation, researchers are working toward developing time dependent material models for the pipe materials to conduct pipe-soil interaction analysis. A number of different visco-elastic and visco-plastic models were developed for polymer materials over the last few decades. However, these models are not extensively used in soil-pipe interaction analysis since these are not incorporated in commercially available finite element software. In this research, time-dependent modelling approach using the features available in a commercial software, Abaqus, is developed. Strain rate dependent test data from published literature are used to develop the model. The model is incorporated in Abaqus using its USDFLD subroutine and simplified modelling techniques for time-dependent behavior. The proposed model successfully simulates the test results of a pipe material and the behavior of a buried pipe.

RÉSUMÉ: Buried polyéthylène est plus utilisés pour leurs différents avantages sur les tuyaux en métal y compris lumière-poids, facilité -tenir compte de terme. Un à court terme et un module à long terme des matériaux tuyaux sont utilisés pour calculer les réponses de conduite indépendamment. Cett- interaction dépendait conduite-sol on de temps matériel dépendant des modèle-sol. Un certain nombre de modèles différents de visco-élastique et visco-plastique ont été développé pour les matériaux polymères dans les dernières décennies. Cependant, ces modèles.

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