Low cycle fatigue (LCF) behaviour as a function of test direction was studied for a quaternary Al–Li–Cu–Mg alloy. The analysis of the variation in fatigue life with plastic strain amplitude ∆ɛp/2 or with average stress amplitude ∆σ/2 or with plastic strain energy per cycle ∆Wp, revealed bilinear power law relationships in all the test directions. The transition strain values in the Coffin–Manson plots were seen to match closely with those obtained in the cyclic stress response as well as with the cyclic stress–strain relationships of the alloy. The observed bilinear behaviour in these LCF properties was attributable to a change in deformation as well as to the deformation assisted fracture mode. The alloy revealed significant in plane anisotropy in the LCF properties. The observed anisotropy was found to result from the combined effects of strong crystallographic texture and grain fibering.
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References
1.
PEELC. J., EVANSB., and McDARMAIDD. S.: Met. Mater.,1987, 3, 449–455.
2.
PETERSM., WELPMANNK., ZINKW., and SANDERST. H., Jr: in Aluminium—lithium alloys III’, (ed. C. Baker et al.), 239-246; 1986, London, The Institute of Metals.
3.
PETERSM., ESCHWEILERJ., and WELPMANNK.: Scr. Metall.,1986, 20, 259–264.
4.
FOXS., FLOWERH. M., and McDARMAIDD. S.: in‘Aluminium alloys — their physical and mechanical properties’, Vol. 2, (ed. SandersT. H.Jr and StarkeE. A., Jr), 939–960; 1986, Warley, Engineering Materials Advisory Services.
KUHLMANN-WILSDORFD. and LAIRDC.: Mater. Sci. Eng.,1977, 27, 137–156.
12.
KUHLMANN-WILSDORFD. and LAIRDC.: Mater. Sci. Eng.,1980, 46, 209–219.
13.
CHENGA. S. and LAIRDc.: Mater. Sci. Eng.,1981, 51, 111–121.
14.
WAHIR. P., KUTUMBARAOV. V., YUNH. M., and CHENW.: in‘Low cycle fatigue and elastic—plastic behaviour of metals’, 290–301; 1987, New York, Elsevier Applied Science.
15.
SANDERSR. E., Jr and E. A. STARKE, Jr: Mater. Sci. Eng.,1977, 28, 53–68.
16.
STARKEE. A., Jr: in ‘Fatigue and microstructure’, (ed.LutjeringG. and MeshiiM.), 205-232; 1978, Metals Park, OH, American Society of Metals.
17.
SANDERST. H., Jr, E. A. LUDWICZAK, and SAWTELLR. R.:Mater. Sci. Eng.,1980, 43, 247–260.
18.
SRIVATSANT. S. and COYNEE. J., Jr: Mater. Sci. Technol.,1989, 5, 548–555.
19.
SANDERST. H., Jr and E. A. STARKE, Jr: Acta Metall.,1982, 30, 927–939.
20.
SRIVATSANT. S. and COYNEE. J., Jr: Int. J. Fatigue, 1986, 8, 201–208.
21.
ICHIREDDINED., RAHOUADJR., and CLAVELM.: Scr. Metall.,1988, 22, 167–172.
22.
PRASADN. ESWARA, MALAKONDAIAHG., and RAOP. RAMA: Mater. Sci. Eng. A, 1992, A150, 221-229.
23.
MORROWJ.: in ‘Internal friction, damping and cyclic plasticity’, STP 378, 45-87; 1965, Philadelphia, PA, ASTM.
24.
LANDGRAFR. W.: in ‘Achievement of high fatigue resistance in metals and alloys’, STP 467, 3; 1970, Philadelphia, PA, ASTM.
25.
COYNEE. J.Jr, SANDERST. H., and STARKEE. A.Jr: in Aluminum—lithium alloys’, (ed.SandersT. H.Jr and StarkeE. A.Jr), 293-303; 1981, Warrendale, PA, TMS/AIME.
26.
SRIVATSANT. S., YAMAGUCHIK., and STARKEE. A., Jr: Mater. Sci. Eng.,1986, 83, 87–107.
MEDIRATTAS. R., RAMASWAMYV., and RAOP. RAMA: &T. Metall.,1986, 20, 555–558.
29.
HALFORDG. R.: Mater., 1996, 1, 3–18.
30.
SANDERST. H., Jr and E. A. STARKE, Jr: Acta Metall.,1982, 30, 927–939.
31.
LINF. S. and STARKEE. A., Jr: Mater. Sci. Eng.,1984, 39, 27–41.
32.
HEIKKENENH. C., LINF. S., and STARKEE. A., Jr: Mater. Sci. Eng.,1981, 51, 17–23.
33.
PAOP. S., SANICARANK. K., and O'NEALJ.E.: Corrosion, 1989, 45, 307–323.
34.
PAOP. S., IMAMM. A., COOLEYL. A., and YODERG. R.: Corrosion, 1989, 45, 530–535.
35.
PIASCIKR. S. and GANGLOFFR. P. : Metall. Trans. A, 1991, 22A, 2415–2428.
36.
COFFINL. F.: J. Mater.,1971, 6, 388–402.
37.
LERCHB. and GEROLDV.: Acta Metall., 1985, 33, 1709–1716.
38.
MATHEWM. D., SINGHV., CHENW., and WAHER. P.Acta Metall. Mater.,1991, 39, 1507–1513.
39.
SINGHV., SUNDARARAMANM., CHENW., and WAHIR. P.: Metall. Trans. A, 1991, 22A, 499–506.
40.
WELLSC. H. and SULLIVANC. P.: ASM Trans. Q.,1969, 62, 263–270.
41.
VARMAV. K., MURALEEDHARANK., and MALAKONDAIAHG.: in ‘ICF7: Advances in fracture research’, Vol. 2, (ed. K. Salama et al.), 1331-1339; 1989, New York, NY, Pergamon Press.
42.
SANDERST. H., Jr and E. A. STARKE, Jr: Metall. Trans. A, 1976, 7A, 1407–1418.
43.
LINF. S.: Doctoral dissertation, University of Virginia, Charlottesville, VA, USA, 1978.
44.
CHENR. T. and STARKEE. A., Jr: Mater. Sci. Eng.,1984, 67, 229–245.
45.
FENGW. X., LINF. S., and STARKEE. A., Jr: Metall. Trans. A, 1984, 15A, 1209–1220.
46.
SIUVATSANT. S. and COYNEE. J., Jr: in ISTFA 1986: International symposium for testing and failure analysis’, 281-293; 1986, Metals Park, OH, ASM International.
47.
SRIVATSANT. S., HOFFT., and PRAICASHA.: Eng. Fract. Mech.,1991, 40, 297–309.
48.
ESWARA PRASADN., MALAKONDAIAHG., RAJUK. N., and RAMA RAOP.:in ‘ICF7: Advances in fracture research’, Vol. 2,(ed. SalamaK. et al.), 1103–1112; 1989, New York, NY, Pergamon Press.
49.
XUY. B., WANGX., WANGZ. G., LUOL. M., and BMY. L.: Scr. Metall. Mater.,1990, 24, 571–576.
50.
SAUNAA. and ANTOLOVICHS. D.: Metall. Trans. A, 1975, 6A, 1809–1828.
51.
SUNDARARAMANM., CHENW., SINGHV., and WAHIR. P.: Acta Metall. Mater.,1990, 38, 1813–1822.
52.
SRIVATSANT. S. and COYNEE. J., Jr: Mater. Sci. Technol.,1987, 3, 130–138.
53.
COFFINL. F.: Metall. Trans.,1972, 3, 1777–1788.
54.
RADHAKRISHNANV. M.: Int. J. Fatigue, 1992, 14, 305–311.
55.
SRIVATSANT. S., HOFFT., and PRAKASHA.: Mater. Sci. Technol.,1991, 7, 991–997.
56.
DHERSJ., DRIVERJ., and FOURDEUXA.: in Aluminium—lithium alloys III’, (ed. C. Baker et al.), 233-238; 1986, London, The Institute of Metals.
