Mechanical modelling of gaskets in exhaust after-treatment system of trucks

Sammanfattning: With the world proceeding towards a clean and sustainable environment,the creation of technology and its implementation also needs to be sustain-able. The importance of combustion engine vehicles to meet more stringentemission standards puts a requirement on the industry to develop suitableafter-treatment systems to meet those standards. It is a matter of quality,technical soundness and the brand reputation of Scania to ensure effectivetreatment of the exhaust gases before being emitted into the environment.Thus the components involved in the after-treatment system (also called si-lencer) need to be designed accordingly. The scope of this work deals withthe second stage of after-treatment systems called the Diesel Particulate Fil-ter Assembly. This assembly consists of a filter tube with a graphite gasketaround it resting against a support ring welded to the tube. The weld cre-ates a tube distortion that contributes to tolerance issues. This work dealswith developing robust and efficient simulation methodologies to predict thesealing performance of the gasket. Component tests were done to understandthe material behavior in compression, shear and tension. A friction test tostudy the tangential behavior was also performed. Using the test data, dif-ferent material models were developed to recreate the behavior of the gasket.Parameter optimization was used to optimize the material model for a hyper-elastic reduced polynomial model of degree 3 (or Yeoh model) to minimizethe error between the test curve and the predicted simulation curve.