14th International Conference on Shot Peening

Novel Applications of Laser Shock Peening for Aerospace Applications

Michael E. Fitzpatrick, Niall Smyth, Mitchell Leering

Coventry University, Priory St, Coventry, UK; Michael.Fitzpatrick@coventry.ac.uk

Introduction

Laser shock peening (LSP) has become an accepted and valued method of surface engineering, with numerous successful applications in high-value industries including aerospace and nuclear power. There have been many studies published showing successful use of laser peening in manufacturing, particularly for aeroengine components. There is now much research effort in applying the method to new applications as well as for in-service repairs.

Objectives

To-date, almost all the applications of LSP have been in surface treatment for the improvement in fatigue lifetime, through the introduction of deep, high-magnitude, compressive residual stress that acts to prevent or delay the initiation of cracks, and reduce their growth rate when and if initiated. The method has shown itself to be highly successful for this, with the proviso that the peak stress in the component needs to co-locate with the compressive layer induced by the LSP. There has been relatively little work on the use of LSP to enhance lifetime for long cracks, particularly in the relatively thin sections found in aerospace applications.