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Improved Ti-6Al-4V Fan Blade Foreign Object Damage (FOD) Tolerance

From Lambda Technologies

Aircraft engines are subject to high cycle fatigue (HCF) that can lead to engine failures. Further, foreign object damage (FOD) caused by the ingestion of debris into the engine, creates crack initiation sites that exacerbate the effects of HCF. At a minimum, this damage can lead to increased inspections and additional maintenance. At worst, the combined effect of HCF and FOD may cause catastrophic engine failures.

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Topics of Interest

Mechanical surface treatments that introduce a layer of residual surface compression improve high cycle fatigue (HCF) performance. If the depth of compression extends through the thickness of blade or...

Mechanical surface treatments including shot peening (SP), laser shock peening (LSP) and low plasticity burnishing (LPB) have been shown to introduce compressive residual stresses that improve high...

The deep stable layer of compressive residual stress produced by low plasticity burnishing (LPB) has been demonstrated in laboratory testing to improve damage tolerance in engine alloys IN718,...

This paper describes the application of Low Plasticity Burnishing (LPB) to increase the damage tolerance and fatigue strength of a Ti-6Al-4V fan blade that is fatigue life limited by the occurrence of...

Low plasticity burnishing (LPB) has been demonstrated to increase the damage tolerance of Ti- 6Al-4V fan blades by an order of magnitude. First stage Ti-6Al-4V fan blades were LPB processed using a...