Abstract
This article discusses that thermomechanical simulation helps optimize a catalytic converter assembly for durability and performance. A careful examination of a typical, freshly manufactured vermiculite m at reveals high Hertzian-type mat deformation under the inward ribs. Excess pressures under these ribs during canning may lead to substrate cracking or microfractures in the mat, which under gas impingement may lead to accelerated mat erosion. The present study also has been focused on thermomechanical modeling of the vermiculite mat's swelling and its effect on durability, using the Abaqus nonlinear finite element analysis code from Hibbit, Karlsson & Sorensen Inc., Pawtucket, RI, to study the case of a clam-shell converter package with ceramic package and vermiculite-ceramic mat. Because of the viscoelastic nature of the mat, the instantaneous load displacement curve typically shows a stiffer response than the steady-state response. Because of the relatively high compressibility of the mat material, the hyperfoam formulation based on Hill's strain energy potential is taken as the appropriate constitutive model.
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