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 pro
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.
대표청구항▼
1. 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 s
1. 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; andproviding the workpiece with the residual stress profile. 2. The method of claim 1, wherein the sum of the compressive stress and the residual stress is more positive than a compressive stress limit of the workpiece. 3. The method of claim 1, wherein the load condition is a cyclic load condition. 4. The method of claim 1, wherein the workpiece is a gear. 5. The method of claim 1, wherein the providing the workpiece with the residual stress profile comprises cavitation peening. 6. The method of claim 1, wherein the providing the workpiece with the residual stress profile comprises laser peening. 7. The method of claim 1, wherein the determining the compressive load stress profile or determining the tensile load stress profile comprises a finite element analysis of the workpiece. 8. The method of claim 1, wherein at least one of the compressive load stress profile and the residual stress profile are determined as a function of a depth of the workpiece. 9. The method of claim 1, wherein at least one of the compressive load stress profile and the residual stress profile are determined as a function of an outer profile translation path of the workpiece. 10. 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; anddetermine 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; andwherein a summation of the residual stress curve and the compressive load stress curve is greater than the compressive limit curve along the dimension. 11. The apparatus of claim 10, wherein a direction of the first load condition is different than a direction of the second load condition. 12. The apparatus of claim 10, wherein the dimension is a depth of the workpiece. 13. The apparatus of claim 10, wherein the dimension is a translational path along an outer surface of the workpiece. 14. The apparatus of claim 10, wherein the workpiece is a gear. 15. The apparatus of claim 10, further configured to provide the residual stress profile to the workpiece. 16. An apparatus comprising: a processor; anda 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; andprovide a second residual stress as a function of the first bending stress. 17. The apparatus of claim 16, wherein a sum of the first contact stress and the first residual stress is less than a first stress limit of the tooth and wherein a sum of the first bending stress and the second residual stress is less than a second stress limit of the tooth. 18. The apparatus of claim 16, wherein a sum of the first contact stress limit and the first residual stress is greater than a first compressive yield limit of the tooth and wherein a sum of the first bending stress and the second residual stress is greater than a second compressive yield limit of the tooth. 19. The apparatus of claim 16, wherein at least one of the providing the first residual stress and providing the second residual stress comprises at least one of laser peening, cavitation peening, and low plasticity burnishing. 20. The apparatus of claim 16, wherein the first contact stress and the first residual stress are associated with a first depth associated with the mesh point and wherein the second contact stress and the second residual stress are associated with a first depth associated with the root.
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이 특허에 인용된 특허 (10)
Zurecki, Zbigniew; Ghosh, Ranajit; Frey, John Herbert; Grimm, Lance Michael, Apparatus and method for improving work surface during forming and shaping of materials.
Burris Kenneth W. ; Clements Thomas E., Process for improving fatigue resistance of a component by tailoring compressive residual stress profile, and article.
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