The initiation of fatigue cracks at corrosion pits has been responsible for the failure of a wide range of engineering components. The present work demonstrates the effects ofcorrosion pits up to 250μm deep on the initiation offatigue cracking in both plain and notched specimens of a low-alloy steel. Fatigue strength can be reduced by as much as 70% due to the presence of such corrosion pits. The concepts of linear elastic fracture mechanics are used in an attempt to describe the development and growth of fatigue cracks from shallow corrosion pits.
Get full access to this article
View all access options for this article.
References
1.
JACKA. R. and PArEasotiA. N.: Proc. Cont. ‘Influence of environment on fatigue’, London, 1977, Institution of Mechanical Engineers, 75–84.
2.
GREWJ. et al.: American Power Conference, Chicago, III., 1978, Paper51.
3.
HETIERLEYL.: ‘The initation of fatigue cracks from pits in a 2.5 NiCr-MoV rotor shaft steel‘, Report No. RD/L/N 160/79, Central Electricity Research Laboratories, 1980.
4.
BROWNW. F. and SRAWLEYJ. E.: ‘Plane strain fracture toughness testing of high strength metallic materials’, STP410; 1967, Philadelphia, Pa, American Society for Testing and Materials.
5.
ELSENDERA., HOPIUNSP., and BATESA. D.: Met. Technol., 1980, 7, 256–258.
6.
CLARKW. G.JR: ‘Fracture toughness and slow stable testing’, STP 601, 138–153; 1976, Philadelphia, Pa, American Society for Testing and Materials.
7.
CHELLG. G.: ‘Elastic-plastic fracture testing‘, Report No. RD/L/R2007, Central Electricity Research Laboratories, 1980.
8.
OHUCHIDAH. A., NISHIOKAs K. and. USAMI: Proc. 3rd Int. Congr. on ‘Fracture’, Munich, 1973, 442.
9.
FROSTN. E.: Proc. Inst. Mech. Eng., 1959, 173, 811–827.
10.
EL HADDADM. H., TOPPERT. N. and SMITHK. N.: Eng. Fract. Mech., 1974, 11, 573–584.
11.
KOBAYASHIH H. and. NAKAGAWA: Proc. 1st Int. Conf. on ‘Mechanical behaviour of materials’, Kyoto, 1971.
12.
KITAGAWAs H. and. TAKAHASHI: Proc. 2nd Int. Conf. on ‘Mechanical behaviour of materials’, Boston, 1976.
13.
SMITHR. A.: Int. J. Fract., 1977, 13, 717–719.
14.
IRWING. R.: J. Basic Eng. (Trans. ASME, D), 1960, 82, 417–425.
15.
scorrP. M. and THORPET. W.: ‘Prediction of semi-elliptic crack shape development during fatigue crack growth’, Report AERE-R10104, UKAEA, Harwell, Jan. 1981.
16.
HARTRANFTR. T. and sotG. C.: ‘Methods of analysis of crack problems‘, 179–238; 1973, Amsterdam, Noordhoff.
17.
EL HADDADM. H., TOPPERT. H. and TOPPERT. N.: J. Eng. Mater. TechnoL, 1981, 103, 91–96.
18.
ELBERw.: ‘Damage tolerance in aircraft structures‘, STP486, 230; 1971, Philadelphia, Pa, American Society for Testing and Materials.
19.
LINDLEYT. C. and RICHARDSc. E.: Mater. Sci. Eng., 1974, 14, 281.
20.
MINAKAWAK. and MCEVILYA. J.: Int. Conf. ‘Fatigue thresholds’, Stock-holm, 1981.
21.
ASTM Designation: E24-78, ‘Prosposed method of test for measure-ment of fatigue crack growth rates’.
