One way to measure the benefit of Laser Shock Peening (LSP) is to perform high cycle fatigue (HCF) testing of engine components that have undergone LSP. In a production environment, there is an additional constraint that the LSP process must prove itself stable over time. During development of LSP at GE, numerous studies were carried out to identify the factors that affect HCF strength. Based on these studies, six production processes have been introduced over the last seven years. In this article, a study of the influence of LSP spot overlap and laser fluence on HCF strength is presented. Finally, a geometric scaling parameter that relates HCF strength to spot overlap is proposed as a means of predicting HCF benefit for various engine components.

1.
Askar yan
,
C.A.
, &
Moroz
,
E.M.
(
1963
)
Pressure on evaporation of matter in a radiation beam
,
Journal of Experimental and Theoretical Physics Letters
,
1638
44
.
2.
White
,
R.M.
(
1963
),
Elastic wave generation by electronic bombardment or electromagnetic wave absorption
,
Journal of Applied Physics
,
2123
2124
.
3.
Fabbro
,
R.
,
Peyre
,
P., L.
, &
Scherpereel
,
X.
(
1998
),
Physics and applications of laser-shock processing
,
Journal of Laser Applications
,
265
279
.
4.
Tenaglia
,
R.
,
&Lahrman
,
D.
(
2003
),
Preventing fatigue failures with laser peening
,
AMPTIAC Quarterly
,
3
7
.
5.
Hoffman
,
I
,
Laser hammers open way for stronger and lighter aircraft
,
Oakland Tribune
, Jam 25,
2004
.
6.
Mannava
,
S.R.
,
Cowie
,
W.R.
, &
McDaniel
,
A.E.
(
1996
),
The effect of laser shock peening on airfoil FOD and high cycle fatigue
,
ENSIP Conference
.
7.
Mannava
,
S.R.
(
1997
),
unpublished GE report TM97-182
,
GE Aircraft Engines
,
Cincinnati
8.
Rockstroh
,
T.J.
(
1997
),
Unpublished work, GE Aircraft Engines, Cincinnati.
9.
Clauer
,
A.H.
,
Walters
,
C.T.
,
Ford
,
S.C.
(
1983
)
The effect of laser shock processing on the fatigue properties of –T3 aluminum
, in
Lasers in Materials Processing, American Society of Metals
,
7
22
.
10.
.
Montross
,
C.S.
,
Florea
,
V
,
Brandt
,
M.
, &
Swain
,
M.V.
(
2003
),
The effect of peening with small, high-energy, Q-switched lasers on sub-surface properties of aluminium
,
Journal of Materials Science Letters.
11.
Fabbro
,
R.
,
Fournier
,
J.
,
Ballard
,
P.
,
Devaux
,
D.
&
Virmont
,
J.
(
1990
),
Residual stresses induced by laser shocks
,
Journal of Applied Physics
,
775
784
.
12.
Berthe
,
L
,
Fabbro
,
R.
,
Peyre
,
P.
, &
Bartnicki
,
E
(
1998
),
Experimental study of the transmission of breakdown plasma generated during laser shock processing
,
European Journal of Applied Physics
, pp.
215
218
.
13.
Montross
,
C. S.
,
Wei
,
T.
,
Ye
,
L.
,
Clark
,
G.
, &
Mai
,
Y.W.
(
2002
),
Laser shock processing and its effects on microstructure and properties of metal alloys: a review
,
International Journal of Fatigue
,
1021
1036
.
13.
Clauer
,
A.H.
, &
Fairand
,
B.
(
1981
) Effects of laser-induced shock waves.
Meyers
,
M. A.
, and
Murr
,
L.E.
(eds),
Shock waves and high-strain rate phenomena in metals
,
Plenum
,
675
703
.
14.
Ford
,
S.C.
,
Fairand
,
B.P.
,
Clauer
,
A.H.
, &
Galliher
,
R.D.
(
1980
),
Technical Report AFWAL-TR-80-3001
, Vol.
II
.
15.
Ruschau
,
J.J.
,
John
,
R.
,
Thompson
,
S.R.
, and
Nicholas
,
T.
(
1999
),
Fatigue Crack Growth Rate Characteristics of Laser Shock Peened Ti-6Al-4V
,
Journal of Materials and Technology
,
321
329
.
16.
Peyre
,
P.
,
Fabbro
,
R.
,
Merrien
,
P.
, &
Lieurade
,
H.P.
(
1996
),
Laser shock processing of aluminium alloys. Application to high cycle fatigue behaviour
,
Materials Science and Engineering
,
A210
,
102
113
.
17.
Ballard
,
P.
,
Fournier
,
J.
,
Fabbro
,
R.
, &
Frelat
,
J
(
1991
)
Residual stresses induced by laser shocks
,
Journale de Physique IV (Colloque)
,
487
494
.
18.
Smith
,
P.R.
,
Shepard
,
M. J.
,
Prevey
,
P.S.
, &
Clauer
,
A. H.
(
2000
)
Effect of power density and shock peening repetition on laser shock peening of Ti-6Al-4V
,
Journal of Materials Engineering and Performance
,
33
37
.
19.
Dane
,
C.B.
,
Hackle
,
L.A.
,
Daly
,
J
, &
Harrison
,
J.
(
1998
),
Shot peening with lasers
,
Advanced Materials and Processes
,
37
38
.
20.
Masse
,
J.E.
, &
Barreau
G.
(
1995
)
Surface Modification by Laser Induced Shock Waves
,
Surface Engineering
,
131
132
.
21.
Clauer
,
A.H.
, &
Koucky
,
J.R.
(
1991
),
Laser shock processing increases the fatigue life of metal parts
,
Materials and Processing
,
3
5
.
22.
Peyre
,
P.
,
Berthe
,
L
,
Scherpereel
,
X.
&
Fabbro
,
R.
(
1998
),
Laser shock processing of aluminium coated 55C1 steel in water-confinement regime, characterization and application to high-cycle fatigue behaviour
,
Journal of Materials Science A
,
1421
1429
.
23.
Ruschau
,
J.J.
,
John
,
R.
,
Thompson
,
S.R.
, &
Nicholas
,
T.
(
1999
),
Fatigue crack nucleation and growth rate behaviour of laser shock peened titanium
,
International Journal of Fatigue
,
S199
S209
.
24.
Forget
,
P.
, &
Jeandin
,
M
(
1995
),
Crystallographic deformation of mono- and polycrystalline Ni-based superalloys due to laser shock processing in the confined mode
,
Journal de Physique III
,
1133
1144
.
25.
Bolger
,
J.A.
,
Montross
,
C.S.
,
&Rode
,
A.V.
(
1999
)
Shock wave in basalt rock generated with high power lasers in a confined geometry
,
Journal of Applied Physics
5461
5466
.
26.
Lan
,
C.
,
Yang
,
J.
,
Ren
,
N.
, &
Zhang
,
Y
(
1997
),
Parameter optimizing experiment for laser shock-processing on anti-fatigue and –fracture property of metal
,
Chinese Journal of Lasers
,
207
212
.
This content is only available via PDF.
You do not currently have access to this content.