Some damages were found at the forks of low pressure turbine blades caused by random vibration and steam-flashback vibration. In this study, for the aim of fatigue property improvement, laser peening technology for 12Cr stainless steel was developed and material properties were examined. Laser peening is a process to induce compressive residual stress to the material surface. Fatigue specimens which simulate the stress concentration zone of forks were fabricated and laser peening was applied to the su...
英字タイトル:
Development of laser peening technology for low pressure turbine blades to improve fatigue properties

Abstract This paper presents steady-state Eulerian thermal analysis of welds using moving coordinates that has been reported as computationally very efficien t method. This method requires much less CPU time than conventional Lagrangian method in which heat source moves in computational domain. This kind of Euleri an analysis can be done conveniently by using computational fluid dynamics code. To show the availability of this method, it is applied to a groove weld of a core shroud in a boiling water react...
英字タイトル:
High Speed Thermal Analysis on Moving Heat Source using CFD code