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Residual stress affecting environmental damage in 7075-T651 alloy

  • A.K. Vasudevan EMAIL logo , K. Sadananda and P.S. Pao
From the journal Corrosion Reviews

Abstract

The role of tensile overload superimposed on a constant amplitude cycling results in compressive residual stresses at the crack tip that cause crack growth retardation. The degree to which this effect manifests depends on whether the tests are done at a constant driving force (Kmax) or at a constant crack growth rate (da/dN). It is observed that depending on the magnitude of the overload at a given applied base stress intensity, these residual stresses can have significant effect on the crack growth in both the inert (vacuum) and the chemical (NaCl) environments. In general, cracks will grow only if the total crack tip driving force Ktotal exceeds the long crack intrinsic threshold K*max,th. The crack growth retardation results can be attributed to the combined effects of the crack tip chemical reaction rates and the overload compressive residual stresses.

Acknowledgments

AKV would like to thank Dr. Eun Lee, NAVAIR (retired) for helpful technical discussions. Thanks to Dr. N. Apetre (NRL) for increasing the resolution of the figures.

References

Chanani GR. Retardation of fatigue crack growth in 7075 aluminum. Met Eng Quart 1975; 15: 40–48.Search in Google Scholar

Chanani GR. Effect of test frequency on the retardation behavior of 7075-T6 and 2024-T8 alloys. Int J Fracture 1976; 12: 652–659.10.1007/BF00034655Search in Google Scholar

Chanani GR. Investigation of effects of saltwater on retardation behavior of aluminum alloys. ASTM STP-642 1978: 51–72.10.1520/STP28714SSearch in Google Scholar

Croft MC, Jiswari NM, Zhong Z, Holtz RL, Sadananda K, Skaritka JR, Tsakalakos T. Fatigue history and in-situ loading studies of the overload effect using high resolution X-ray strain profiling. Int J Fatigue 2007; 29: 1726–1736.10.1016/j.ijfatigue.2007.01.016Search in Google Scholar

Dowling NE. Mechanical behavior of materials. New York, NY: Prentice Hall, 1993: 295.Search in Google Scholar

Kitagawa H, Takahashi S. Application of fracture mechanics to very small cracks or cracks in the early stages. In: Proceedings of the 2nd International Conference on Mechanical Behavior of Materials. Metals Park, OH: American Society of Metals, 1976: 627–631.Search in Google Scholar

Kujawski D, Sadananda K. Effect of crack-tip stresses on stress corrosion cracking behavior. Metall Mater Trans A 2011; 42A: 377–382.10.1007/s11661-010-0373-5Search in Google Scholar

Lee EU, Vasudevan AK, Glinka G. Environmental effects on low cycle fatigue of 2014-T351 and 7075-T651 aluminum alloys. Int J Fatigue 2009; 31: 1938–1942.10.1016/j.ijfatigue.2008.11.012Search in Google Scholar

Mason ME. Time-dependent corrosion fatigue crack propagation in 7000 series aluminum alloys. MS thesis. Charlottesville, VA, USA: Department of Materials Science and Engineering, University of Virginia, 1994.Search in Google Scholar

Mikhevsky S, Glinka G. Elastic–plastic fatigue crack growth analysis under variable amplitude loading spectra. Int J Fatigue 2009; 31: 1828–1836.10.1016/j.ijfatigue.2009.02.035Search in Google Scholar

Pao PS, Holtz RL. Corrosion fatigue cracking in AL 7075 alloys. Final report NRL/MR/6355-14-9582. Washington, D.C.: Naval Research Labs, December 9, 2014.10.21236/ADA613246Search in Google Scholar

Prevey PS, Cammett JT. The influence of surface enhancement by low plasticity burnishing on the corrosion fatigue performance of AA7075-T6. Int J Fatigue 2004; 26/9: 975–982.10.1016/j.ijfatigue.2004.01.010Search in Google Scholar

Sadananda K. Failure diagram and chemical driving forces for subcritical crack growth. Metall Mater Trans A 2012; 44A: 1190–1199.10.1007/s11661-012-1469-xSearch in Google Scholar

Sadananda K, Ramaswamy DN. Role of crack tip plasticity in fatigue crack growth. Philos Mag 2001; 5: 1283–1303.10.1080/01418610108214441Search in Google Scholar

Sadananda K, Sarkar S. Modified Kitagawa diagram and transition from crack nucleation to crack propagation. Metall Mater Trans A 2013; 44A: 1175–1189.10.1002/9781118013373.ch9Search in Google Scholar

Sadananda K, Vasudevan AK. Crack tip driving forces and crack growth representation under fatigue. Int J Fatigue 2004; 26: 39–47.10.1016/S0142-1123(03)00105-1Search in Google Scholar

Sadananda K, Vasudevan AK. Review of environmentally assisted cracking. Metall Mater Trans A 2011; 42A: 279–303.10.1007/s11661-010-0472-3Search in Google Scholar

Sadananda K, Vasudevan AK, Holtz RL, Lee EU. Analysis of overload effects and related phenomena. Int J Fatigue 1999; 21: S233–S246.10.1016/S0142-1123(99)00094-8Search in Google Scholar

Sadananda K, Vasudevan AK, Holtz RE. Extension of the unified approach to fatigue crack growth to environmental interactions. Int J Fatigue 2001; 23: 277–286.10.1016/S0142-1123(01)00137-2Search in Google Scholar

Sadananda K, Solanki KN, Vasudevan AK. Subcritical crack growth and crack tip driving forces in relation to materials resistance. Corros Rev 2017; 35: 251–265.10.1515/corrrev-2017-0034Search in Google Scholar

Suresh S. Fatigue of materials, 2nd ed. Cambridge, UK: Cambridge University Press, 1998.10.1017/CBO9780511806575Search in Google Scholar

Turnbull A. Modeling of the chemistry and electrochemistry in cracks – a review. Corrosion 2001; 57: 175–189.10.5006/1.3290342Search in Google Scholar

Vasudevan AK, Sadananda K. Classification of fatigue crack growth behavior. Metall Mater Trans A 1995; 26A: 1221–1234.10.1007/BF02670617Search in Google Scholar

Vasudevan AK, Sadananda K, Glinka G. Critical parameters for fatigue damage. Int J Fatigue 2001; 23: S39–S53.10.1016/S0142-1123(01)00171-2Search in Google Scholar

Vasudevan AK, Sadananda K. Role of internal stresses on the incubation times during stress corrosion cracking. Metall Mater Trans A 2011; 42A: 396–404.10.1007/s11661-010-0470-5Search in Google Scholar

Wei RP. Fracture mechanics: integration of mechanics, materials science, and chemistry. Cambridge, UK: Cambridge University Press, 2010.10.1017/CBO9780511806865Search in Google Scholar


Article note

AKV dedicates this article to a dear friend, Prof. David Quesnel, University of Rochester, NY, who passed away in early 2018. David was an excellent teacher and was a leading scientist in the area of adhesion and stress corrosion science.


Received: 2019-01-07
Accepted: 2019-03-01
Published Online: 2019-06-22
Published in Print: 2019-09-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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