Effect of thickness on fatigue crack growth (FCG) behavior has been investigated at varying stress ratio in a quaternary Al-Li alloy. The thickness has been observed to influence FCG behavior in two opposite ways, depending on stress ratio. The crack closure concept has been invoked to rationalize the observed behavior. The roughness-induced crack closure is the main governing mechanism in the alloy under investigation. Factors such as fracture surface asperity size and severity of plane strain condition have been argued to affect the extent of crack closure, and consequently, fatigue crack growth behavior.

Issue Section:
Technical Papers
Topics:
Alloys, Aluminum, Fatigue cracks, Lithium, Stress, Fracture (Materials), Plane strain, Surface roughness
1.
Cadman, C. D., Turner, C. C., and Hillberry, B. M., 1988, ASTM STP 982, ASTM Philadelphia, PA, p. 214.
2.
Eswar Prasad, N., Prasad, K. S., Banerjee, D., Malakondaiah, G., Gokhle, A., Mishra, R. D. K., Sunderarajan, G., and Chakravorty, C. R., 1989, “Microstructure and Mechanical Properties of 8090 Al-Li Alloys,” DMRL Technical Report, DMRL TR-8995, (Restricted).
3.
Griffiths
J. R.
, and
Richards
R. E.
,
1973
,
Mater. Sci. Engrg.
, Vol.
11
, p.
305
305
.
4.
Jack
A. R.
, and
Price
A. T.
,
1972
,
Acta Metall.
, Vol.
20
, p.
857
857
.
5.
Kemp
R. M. J.
,
Wilson
R. N.
, and
Gregson
P. J.
,
1992
,
Fat. Fract. Engg. Mater. Struct.
, Vol.
15
, p.
291
291
.
6.
McClung
R. C.
, and
Sehitoglu
H.
,
1989
,
Engg. Fract. Mech.
, Vol.
33
, p.
237
237
.
7.
McEvily
A. J.
,
1977
,
Metal Sci.
, Vol.
11
, p.
274
274
.
8.
Newman, J. C., 1981, ASTM STP 748, p. 53.
9.
Ritchie
R. O.
,
Smith
R. F.
, and
Knott
J. F.
,
1975
,
Metal Sci.
, Vol.
9
, p.
485
485
.
10.
Rao
Venkateswara K. T.
, and
Ritchie
R. O.
,
1988
,
Acta Metall.
, Vol.
36
, p.
2849
2849
.
11.
Rao
Venkateswara K. T.
,
Bucci
R. J.
,
Jata
K. V.
, and
Ritchie
R. O.
,
1991
,
Mater. Sci. Engrg.
, Vol.
A141
, p.
39
39
.
12.
Rao
Venkateswara K. T.
, and
Ritchie
R. O.
,
1992
,
Inter. Mater. Rev.
, Vol.
37
, p.
153
153
.
13.
Schijve
J.
,
1979
,
Engg. Fract. Mech.
, Vol.
11
, p.
167
167
.
14.
Schijve, J., 1988, ASTM STP 982, ASTM Philadelphia, PA, p. 5.
15.
Suresh, S., and Ritchie, R. O., 1987, Fatigue Crack Growth Threshold Concepts, D. L., Davidson and S. Suresh, eds. TMS-AIME, Warrendale, PA, pp. 227–261.
16.
Saxena Vikas K., 1995, “Mechanical and Metallurgical Aspects of Fatigue Crack Closure,” Ph.D. Dissertation, Indian Institute of Technology, Madras, India.
17.
Saxena
Vikas K.
, and
Radhakrishnan
V. M.
,
1998
,
Metall. Mater. Trans.
, Vol.
29A
, p.
245
245
.
18.
Yu
W.
, and
Ritchie
R. O.
,
1987
,
ASME JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY
, Vol.
109
, p.
81
81
.
This content is only available via PDF.
Copyright © 1999
 by The American Society of Mechanical Engineers
You do not currently have access to this content.