THE INFLUENCE OF SPOT OVERLAP AND LASER FLENCE ON THE HIGH CYCLE FATIGUE (HCF) STRENGTH OF AIRCRAFT ENGINE FAN BLADES

摘要

One way to measure the benefit of Laser ShockPeening (LSP) is to perform high cycle fatigue (HCF)testing of engine components that have undergoneLSP. In a production environment, there is anadditional constraint that the LSP process must proveitself stable over time. During development of LSP atGE, numerous studies were carried out to identify thefactors that affect HCF strength. Based on thesestudies, six production processes have been introducedover the last seven years. In this article, a study of theinfluence of LSP spot overlap and laser fluence onHCF strength is presented. Finally, a geometricscaling parameter that relates HCF strength to spotoverlap is proposed as a means of predicting HCFbenefit for various engine components.