摘要:
A method for preparing a surface (32) includes providing an article (30) having an article surface (32), thereafter first processing the article surface (32) to establish a first residual compressive stress state and a first surface roughness in the article surface (32), and thereafter second processing the article surface (32) by surface compressive texturing to establish a second residual compressive stress state and a second surface roughness in the article surface (32). The second surface roughness is quantitatively less than the first surface roughness, and substantially no material is removed from the article surface (32) in the step of second processing.
摘要:
A method of evaluating the condition of a rolling burnishing element (14) includes moving a burnishing element (14) having an unknown condition against a surface in a preselected test pattern (T1); while moving the burnishing element (14), recording at least one test force profile (30) representative of a force acting on the burnishing element (14) in at least one dimension; and comparing the at least one test force profile (30) to at least one baseline force profile (28) to determine a deviation of the condition of the second burnishing element (14) from a baseline condition.
摘要:
A method of reducing crack propagation in an airfoil (22) includes: providing an airfoil (22) having a root (36) spaced apart from a tip (34), spaced-apart leading and trailing edges (30, 32), a suction side (40) extending from the leading edge (30) to the trailing edge (32), and an opposed pressure side (38) extending from the leading edge (30) and the trailing edge (32), supporting the airfoil (22) against bending loads. The airfoil (22) is burnished using a burnishing element (42), so as to create at least one burnished section (68) of residual compressive stress. The at least one burnished section (68) is located adjacent the leading edge (30) and spaced from the leading edge (30) by an offset distance selected so as to avoid deformation of the leading edge (30).
摘要:
A method of determining parameters for a burnishing operation includes: using a rolling burnishing element (11) to burnish at least two segments (14) on a selected surface (12) of a material sample (13), the segments (14) having a common width (W) and overlapping each other by a preselected overlap value (OV); measuring the resulting hardness of the surface (12); and selecting a working overlap value (OV) for a subsequent burnishing operation on a workpiece (WP), based on the measured hardness.
摘要:
A method of reducing crack propagation in an airfoil (22) includes: providing an airfoil (22) having a root (36) spaced apart from a tip (34), spaced-apart leading and trailing edges (30, 32), a suction side (40) extending from the leading edge (30) to the trailing edge (32), and an opposed pressure side (38) extending from the leading edge (30) and the trailing edge (32), supporting the airfoil (22) against bending loads. The airfoil (22) is burnished using a burnishing element (42), so as to create at least one burnished section (68) of residual compressive stress. The at least one burnished section (68) is located adjacent the leading edge (30) and spaced from the leading edge (30) by an offset distance selected so as to avoid deformation of the leading edge (30).