Shot peening: Difference between revisions
Removed, in the manner of a rivet, I don't see a good comparison there. |
Increase by fatigue life by 15%, on what type of part, this statement excessively vague |
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'''Shot peening''' is a [[process]] used to produce a [[compressive]] [[Stress (physics)#Residual_stress|residual stress]] layer and modify mechanical properties of [[metal]]s. It entails impacting a surface with shot (round metallic, glass or ceramic particles) with force sufficient to create plastic deformation. It is similar to [[sandblasting]], except that it operates by the mechanism of [[plasticity (physics)|plasticity]] rather than [[Wear#Abrasive_wear|abrasion]]: each particle functions as a [[ball-peen hammer]]. In practice, this means that less material is removed by the process, and less dust created. |
'''Shot peening''' is a [[process]] used to produce a [[compressive]] [[Stress (physics)#Residual_stress|residual stress]] layer and modify mechanical properties of [[metal]]s. It entails impacting a surface with shot (round metallic, glass or ceramic particles) with force sufficient to create plastic deformation. It is similar to [[sandblasting]], except that it operates by the mechanism of [[plasticity (physics)|plasticity]] rather than [[Wear#Abrasive_wear|abrasion]]: each particle functions as a [[ball-peen hammer]]. In practice, this means that less material is removed by the process, and less dust created. |
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[[Peening]] a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Usually, peening can increase life-time of parts up to 15%. |
[[Peening]] a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Usually, peening can increase life-time of parts up to 15% (citation needed). |
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[[Plastic deformation]] induces a residual compressive stress in a peened surface, along with tensile stress in the interior. Surface compressive stresses confer resistance to metal [[fatigue (material)|fatigue]] and to some forms of [[corrosion]]. The tensile stresses deep in the part are not as problematic as tensile stresses on the surface because cracks are less likely to start in the interior. |
[[Plastic deformation]] induces a residual compressive stress in a peened surface, along with tensile stress in the interior. Surface compressive stresses confer resistance to metal [[fatigue (material)|fatigue]] and to some forms of [[corrosion]]. The tensile stresses deep in the part are not as problematic as tensile stresses on the surface because cracks are less likely to start in the interior. |
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Revision as of 16:55, 22 January 2008
Shot peening is a process used to produce a compressive residual stress layer and modify mechanical properties of metals. It entails impacting a surface with shot (round metallic, glass or ceramic particles) with force sufficient to create plastic deformation. It is similar to sandblasting, except that it operates by the mechanism of plasticity rather than abrasion: each particle functions as a ball-peen hammer. In practice, this means that less material is removed by the process, and less dust created.
Peening a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Usually, peening can increase life-time of parts up to 15% (citation needed).
Plastic deformation induces a residual compressive stress in a peened surface, along with tensile stress in the interior. Surface compressive stresses confer resistance to metal fatigue and to some forms of corrosion. The tensile stresses deep in the part are not as problematic as tensile stresses on the surface because cracks are less likely to start in the interior.
Shot peening may be used for cosmetic effect. The surface roughness resulting from the overlapping dimples causes light to scatter upon reflection. Because peening typically produces larger surface features than sand-blasting, the resulting effect is more pronounced.
See also
- Almen strip
- Autofrettage, which produces compressive residual stresses in pressure vessels.
- Case hardening
- Differential hardening
- Peening
External links
- Cut Wire Shot - Shot Blasting Media/Abrasive
- Surface Treatment — Mechanical
- Industrial Metal Finishing, Inc. Descriptions of various shot peening media used in the shot peening process.
- Metal Improvement Company Explanation and video on shot peening process and how it increases resistance of metal to fatigue.
- Shot Peening Universe FAQ
- Wheelabrator Wheelblast, Airblast and Peening Discussions Wheelabrator Airblast and Wheelblast Forum For Blasting Professionals
- Cut Wire Shot Images