Component with residual compressive stress

摘要

The turbine blade (1) for the generation of electricity, comprises a curved surface region (4) in the form of a fir tree in a fastening region or a blade footing. The surface region consists of a curved concave region (7, 11) and convex region (10, 12), which adjoin together. The concave and convex regions have different internal compressive stresses by spherical irradiation from zero. The concave region has high compressive stress than the convex region, which amounts to the height of the compressive stress in the concave region of the yield strength of the material of the blade. The turbine blade (1) for the generation of electricity, comprises a curved surface region (4) in the form of a fir tree in a fastening region or a blade footing. The surface region consists of a curved concave region (7, 11) and convex region (10, 12), which adjoin together. The concave and convex regions have different internal compressive stresses by spherical irradiation from zero. The concave region has high compressive stress than the convex region, which amounts to the height of the compressive stress in the concave region of the yield strength of the material of the blade. The concave region has a minimum radius of curvature and the convex region has a width of the three to fivefold of the radius of curvature. The compressive stress amounts to 60% of the yield strength of the material of the turbine blade. The compressive stress in the concave region is around 75% higher than in the convex region with the lower compressive stress. A region has a lateral distribution of the height of the compressive stress with a maximum and/or plateau. The maximum of the curved concave region is higher than the maximum or the plateau of the curved convex region.