Edge-of-contact stresses in blade attachments in gas turbines

摘要

By drawing on analytical solutions to contact problems in the literature, an approach is developed for obtaining two-dimensional, elastic, edge-of-contact stresses in blade attachments in gas turbines. The approach is validated on a benchmark problem. It uses stress resultants from finite element analysis (FEA): stress resultants converge more rapidly than stresses themselves, so that such FEA is less demanding. In addition to reducing FEA, the analytical approach reveals with explicit expressions the nature of edge-of-contact stresses in blade attachments. In particular in this regard, it identifies a hoop stress component right at the edge of contact that is potentially damaging to blades.