Abstract
Fatigue crack behavior in cruciform specimens of Al 7075-T6 under in-plane biaxial loading with mix-mode overloads is investigated. Tests were performed to characterize the fatigue behavior at four different levels of mode-mixity, and for each value of mode-mixity, overloads were applied at three different crack lengths as crack propagated under biaxial tensile loading. A significant change in the fatigue life and the crack growth behavior of the specimen was observed with change in mode-mixity of the applied overload. Although there was an increase in fatigue life for all the cases of mix-mode overloads, the maximum increase was observed for the pure shear overload and the minimum increase was observed for tensile dominant overload. When the shear component in the mix-mode overload was comparable but higher than the tensile component, an increase in mode-mixity value did not always show the increase in the fatigue life of the specimen, which indicates that the increase in fatigue life is not only governed by the combined effect of shear and tensile component of loading but also it is impacted differently by shear and tensile loading.
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Abbreviations
- P max :
-
Maximum cyclic load
- P min :
-
Minimum cyclic load
- R :
-
Stress ratio
- OL:
-
Overload
- P OL-X :
-
Overload in x-axis
- P OL-Y :
-
Overload in y-axis
- R OL-X :
-
Overload ratio in x-axis (POL-X/Pmax)
- R OL-Y :
-
Overload ratio in y-axis (POL-Y/Pmax)
- N OL :
-
Fatigue cycle at overload
- λ OL :
-
Overload biaxiality ratio
- φ M :
-
Mode-mixity [tan−1 (shear load/tensile load)]
- \( \frac{{{\text{d}}a}}{{{\text{d}}N}} \) :
-
Crack growth rate
References
Singh AK, Datta S, Chattopadhyay A, Riddick JC, Hall AJ (2019) Fatigue crack initiation and propagation behavior in Al-7075 alloy under in-phase bending-torsion loading. Int J Fatigue 126:346–356
Singh AK, Datta S, Chattopadhyay A, Hall A, Riddick JC (2019) Fatigue damage initiation and propagation in Al-7075 under combined bending and torsion loading AIAA Scitech 2019 Forum. American Institute of Aeronautics and Astronautics, San Diego
Fathi Sola J, Kelton R, Meletis EI, Huang H (2019) A surface roughness based damage index for predicting future propagation path of microstructure-sensitive crack in pure nickel. Int J Fatigue 122:164–172
Fathi Sola J, Kelton R, Meletis EI, Huang H (2019) Predicting crack initiation site in polycrystalline nickel through surface topography changes. Int J Fatigue 124:70–81
Zhao T, Zhang J, Jiang Y (2008) A study of fatigue crack growth of 7075-T651 aluminum alloy. Int J Fatigue 30:1169–1180
Borrego LP, Ferreira JM, Pinho da Cruz JM, Costa JM (2003) Evaluation of overload effects on fatigue crack growth and closure. Eng Fract Mech 70:1379–1397
Tür YK, Vardar Ö (1996) Periodic tensile overloads in 2024-T3 Al-alloy. Eng Fract Mech 53:69–77
Chung KH, Yang WH (2003) Mixed mode fatigue crack growth in aluminum plates with composite patches. Int J Fatigue 25:325–333
Richard HA, Schramm B, Schirmeisen NH (2014) Cracks on Mixed Mode loading—theories, experiments, simulations. Int J Fatigue 62:93–103
Sander M, Richard HA (2005) Experimental and numerical investigations on the influence of the loading direction on the fatigue crack growth
Borrego LP, Antunes FV, Costa JM, Ferreira JM (2006) Mixed-mode fatigue crack growth behaviour in aluminium alloy. Int J Fatigue 28:618–626
Misak HEE, Perel VYY, Sabelkin V, Mall S (2013) Crack growth behavior of 7075-T6 under biaxial tension-tension fatigue. Int J Fatigue 55:158–165
Lee EU, Taylor RE (2011) Fatigue behavior of aluminum alloys under biaxial loading. Eng Fract Mech 78:1555–1564
Duan M, Li Y, Liu H, Shu Y (2019) Fatigue crack behaviors under asynchronous biaxial loading. Int J Fatigue 126:248–257
Neerukatti RK, Datta S, Chattopadhyay A, Iyyer N, Phan N (2018) Fatigue crack propagation under in-phase and out-of-phase biaxial loading. Fatigue Fract Eng Mater Struct 41:387–399
Wolf CH, Henkel S, Burgold A, Qiu Y, Kuna M, Biermann H (2019) Investigation of fatigue crack growth under in-phase loading as well as phase-shifted loading using cruciform specimens. Int J Fatigue 124:595–617
Datta S, Chattopadhyay A, Iyyer N, Phan N (2018) Fatigue crack propagation under biaxial fatigue loading with single overloads. Int J Fatigue 109:103–113
Singh AK, Datta S, Chattopadhyay A, Phan N (2019) Effect of shear overloads on crack propagation in Al-7075 under in-plane biaxial fatigue loading. ASME 2019 international mechanical engineering congress and exposition. American Society of Mechanical Engineers Digital Collection (Accepted)
Acknowledgements
This research is sponsored by the US Navy Naval Air Systems Command through Cooperative Agreement P-8A Aircraft Support for PMA-290, Program Manager Nam Phan.
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Singh, A.K., Datta, S., Chattopadhyay, A., Phan, N. (2020). Fatigue Crack Growth Behavior in Al-7075 Under In-Plane Biaxial Loading with Mixed-Mode Overloads. In: TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36296-6_136
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DOI: https://doi.org/10.1007/978-3-030-36296-6_136
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