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Overview Of Low Plasticity Burnishing For Mitigation Of Fatigue Damage Mechanisms

From Lambda Technologies
 

 

Surface enhancement technologies such as shot peening (SP), laser shock peening (LSP), and low plasticity burnishing (LPB) can provide substantial fatigue life improvement. However, to be effective, the compressive residual stresses that increase fatigue strength must be retained in service. LPB provides thermally stable compression and can be performed in conventional machine shop environments on CNC machine tools. LPB enables the extension of component service lives fatigue limited by various damage mechanisms including foreign object damage (FOD), corrosion fatigue, pitting, and fretting. The thermal and mechanical stability of the compressive layer are briefly reviewed. The LPB process, tooling, and control system are briefly described. Four representative applications are presented: thermal stability in IN718, improved damage tolerance in Ti-6-4 fan blades, mitigation of fretting fatigue damage in Ti-6-4, and improved corrosion fatigue in 17-4PH stainless steel.

Product Announcements
Lambda Technologies - Surface Enhancement
Surface enhancement offers a variety of benefits ranging from increased life to cost reduction when properly designed and optimized for the material and application. Strength and life can be increased... (read more)
Lambda Technologies - Surface Integrity Studies
Surface Integrity describes the influence of surface property and condition upon material performance. It has long been known that the method of surface finishing and the complex combination of... (read more)
Lambda Technologies - Low Plasticity Burnishing (LPB™)
LPB™ is a patented, mature, proven surface treatment for improving High-Cycle Fatigue (HCF), Stress Corrosion Cracking (SCC) and damage tolerance performance. (read more)
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Lambda Technologies - Controlled Plasticity Burnishing (CPB)
The same tools and control systems developed for low plasticity burnishing (LPB™) can of course be used to deliberately create higher amounts of cold work when warranted. (read more)
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Shot peening is a cold working process in which the surface of a metal part is bombarded with small spherical media called shot. Each piece of shot striking the metal acts as a tiny peening hammer... (read more)
Lambda Technologies - Fatigue Design Diagram (FDD) Analysis
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Integrity Testing Laboratory Inc. - Residual Stress Management Services
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Daemar Inc. - DMR™ Fiber-Lube™
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Topics of Interest
Surface enhancement technologies such as shot peening, laser shock peening (LSP), and low plasticity burnishing (LPB) can provide substantial fatigue life improvement. However, to be effective, the... (Read More)
Surface enhancement technologies such as shot peening (SP), laser shock peening (LSP) and low plasticity burnishing (LPB) can provide mitigation of foreign object damage (FOD), fretting fatigue,... (Read More)
Compressor blades of a military aircraft turbine engine made of 17-4 PH stainless steel have been reported to have blade edge foreign object damage (FOD), corrosion pitting, and erosion damage that... (Read More)
Low Plasticity Burnishing (LPB) is now established as a surface enhancement technology capable of introducing through-thickness compressive residual stresses in the edges of gas turbine engine blades... (Read More)
The benefits of applying low plasticity burnishing (LPB) to 17-4PH Stainless Steel (H1100) on both the fatigue and corrosion fatigue performance were compared with the shot peened (SP) and low stress... (Read More)