System and method for improving a workpiece
AssigneeBell Helicopter Textron Inc.
InventorsRyan T. Ehinger, Ron Woods, David Bockmiller
Life of this patent
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Abstract
A method of modifying a workpiece includes providing a workpiece, determining a load stress profile associated with a load condition, the load stress profile comprising a load stress greater than a material stress limit of the workpiece, determining a residual stress profile, the residual stress profile comprising a residual stress less than the material stress limit of the workpiece, and providing the workpiece with the residual stress profile, wherein a sum of the load stress and the residual stress is less than the material stress limit of the workpiece.
Claims20
A method of modifying a workpiece, comprising:
- providing a workpiece;
- determining a tensile load stress profile associated with a tensile load condition, the tensile load stress profile comprising a tensile load stress beyond a tensile stress limit of the workpiece;
- determining a compressive load stress profile associated with a compressive load condition, the compressive load stress profile comprising a compressive load stress within a compressive stress limit of the workpiece;
- determining a residual stress profile, the residual stress profile comprising a residual stress within the tensile stress limit of the workpiece, wherein a sum of the tensile stress and the residual stress is within the tensile stress limit and a sum of the compressive stress and the residual stress is within the compressive stress limit of the workpiece;
- and
- providing the workpiece with the residual stress profile.
An apparatus comprising:
- a processor configured to:
- determine a tensile limit curve of the workpiece as a function of a dimension of the workpiece;
- determine a compressive limit curve of the workpiece as a function of the dimension of the workpiece;
- determine a tensile load stress profile associated with a tensile load condition, the tensile load stress profile comprising a tensile load stress curve as a function of the dimension of the workpiece;
- determine a compressive load stress profile associated with a compressive load condition, the compressive load stress profile comprising a compressive load stress curve as a function of the dimension of the workpiece;
- and
- determine a residual stress profile, the residual stress profile comprising a residual stress curve as a function of the dimension of the workpiece;
- wherein a summation of the residual stress curve and the tensile load stress curve is less than the tensile limit curve of the workpiece along the dimension;
- and
- wherein a summation of the residual stress curve and the compressive load stress curve is greater than the compressive limit curve along the dimension.
An apparatus comprising:
- a processor;
- and
- a memory coupled to the processor, wherein the memory comprises instructions that cause the processor to:
- determine a first contact stress associated with a mesh point of a tooth of a gear;
- determine a first bending stress associated with a root of the tooth;
- determine a first residual stress to the gear as a function of the first contact stress;
- and
- provide a second residual stress as a function of the first bending stress.
Dependencies are inferred from the claim text.