Elastic-Plastic Thermal Stress Analysis for Metal Substrates for Catalytic Converters

摘要

Thermal stresses and strains to be generated in metal substrates for catalytic converters were simulated by elastic-plastic analysis. The flat and corrugated sheets constituting a honeycomb structure were directly modeled by bilinear thick-shell elements. The model could show the pushing out of the honeycomb core where both gas inlet and outlet side are joined and cracks propagation state of the substrate with the Strengthened Outer Layer. Substrates having the Strengthened Outer Layer with asymmetric joint structure in which sheets are joined only in the gas inlet side have two effects for achieving high durability, which are permitting expansion and contraction of the sheets in the z direction at the gas outlet region and controlling the location of cracks initiation and the direction of cracks propagation.