Dynamic crack propagation in specimens with a surface irregularity

Ali Hassanirad, Vahid Vaziri, Ko-Choong Woo, Marian Wiercigroch

Abstract


Initiation of cracks and their propagation in prescribed orientations on tubular specimens has been made possible on a dynamic fatigue testing rig developed at the University of Aberdeen. This rig was originally designed to perform experiments on single edge notched beams (SENB) [1,2]. Modifications have recently been made so as to accommodate experimental tests on tubular specimens with a range of sizes and other cross sections. Crack initiation at grooves on such specimens has been followed by crack growth. At the same time, lateral oscillations of cracked specimen have been measured, as well as accelerations of base excitation, masses above and below cracked specimen. Forces on these two masses have been observed by two load cells attached at positions close to specimen. These load cells facilitated the measurement of stresses in experiment. Crack length time histories have also been constructed by applying an alternating current potential difference (ACPD) method. Fatigue cracks were initiated at the pre-cut grooves in aluminium tubular specimens. Three specimens with different groove sizes were tested in fifteen individual experiments. A three-dimensional Finite Element model was established for each specimen so as to calculate the stress concentration factor (SCF). This formed the basis of determining the amplitude of forcing input made possible by an electromechanical shaker. The phase shifts of acquired time histories has provided some indication of energy transfer mechanism during fatigue and system dynamic response. Observations of cracked specimen displacement during experiments was compared against calculated displacement from elastic theory. Nonlinear responses were observed, suggesting nonlinear stiffness characteristics of the specimen due to discontinuities introduced by crack growth and plasticity effects. Comparison of damage combinations in experimental observation was made with predictions from BS EN 1999-1-3. All experimental observations of total damage combination were higher than predicted values by the latter code.


Keywords


fatigue crack; dynamics loading; FEM; experiments

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References


C. H. Foong, M. Wiercigroch, and W. F. Deans. Novel dynamic fatigue-testing device: design and measurements. Measurement Science and Technology, 17, (8), (2006), pp. 2218–2226. https://doi.org/10.1088/0957- 0233/17/8/023.

N. Jaksic, C. H. Foong, M. Wiercigroch, and M. Boltezar. Parameter identification of the fatigue-testing rig. International Journal of Mechanical Sciences, 50, (7), (2008), pp. 1142–1152. https://doi.org/10.1016/j.ijmecsci.2008.04.007.

Fatigue design of offshore steel structures. DNV Recommended Practice DNV-RP-C203, (2016).

J. A. Ronevich, E. J. Song, Z. Feng, Y. Wang, C. D’Elia, and M. R. Hill. Fatigue crack growth rates in high pressure hydrogen gas for multiple X100 pipeline welds accounting for crack location and residual stress. Engineering Fracture Mechanics, 228, (2020). https://doi.org/10.1016/j.engfracmech.2019.106846.

M. J. Gam, B. S. Jang, and J. H. Park. A study on the fatigue analysis for a vertical caisson on FPSO subjected to the nonlinear wave loading. Ocean Engineering, 137, (2017), pp. 151–165. https://doi.org/10.1016/j.oceaneng.2017.03.057.

R. Shoghi and H. Shiri. Re-assessment of trench effect on fatigue performance of steel catenary risers in the touchdown zone. Applied Ocean Research, 94, (2020). https://doi.org/10.1016/j.apor.2019.101989.

L. Carneiro, X. Wang, and Y. Jiang. Cyclic deformation and fatigue behavior of 316L stainless steel processed by surface mechanical rolling treatment. International Journal of Fatigue, 134, (2020). https://doi.org/10.1016/j.ijfatigue.2019.105469.

P. Xiang, L. J. Jia, M. Shi, and M. Wu. Ultra-low cycle fatigue life of aluminum alloy and its prediction using monotonic tension test results. Engineering Fracture Mechanics, 186, (2017), pp. 449–465. https://doi.org/10.1016/j.engfracmech.2017.11.006.

W. Li, X. Xing, N. Gao, and P. Wang. Subsurface crack nucleation and growth behavior and energy-based life prediction of a titanium alloy in high-cycle and very-high-cycle regimes. Engineering Fracture Mechanics, 221, (2019). https://doi.org/10.1016/j.engfracmech.2019.106705.

C. P. Okeke, A. N. Thite, J. F. Durodola, and M. T. Greenrod. A novel test rig for measuring bending fatigue using resonant behaviour. Procedia Structural Integrity, 13, (2018), pp. 1470–1475. https://doi.org/10.1016/j.prostr.2018.12.303.

N. Nagabhooshanam, S. Baskar, and P. K. Nagarajan. Design and fabrication of fatigue test rig and preliminary investigation on flax composite beam. Materials Today: Proceedings, 5, (5), (2018), pp. 11771–11779. https://doi.org/10.1016/j.matpr.2018.02.146.

H. Wei, P. Carrion, J. Chen, A. Imanian, N. Shamsaei, N. Iyyer, and Y. Liu. Multiaxial high-cycle fatigue life prediction under random spectrum loadings. International Journal of Fatigue, 134, (2020). https://doi.org/10.1016/j.ijfatigue.2019.105462.

C. H. Foong, M. Wiercigroch, E. Pavlovskaia, and W. F. Deans. Nonlinear vibration caused by fatigue. Journal of Sound and Vibration, 303, (1-2), (2007), pp. 58–77. https://doi.org/10.1016/j.jsv.2006.12.008.

C. H. Foong, E. Pavlovskaia, M. Wiercigroch, and W. F. Deans. Chaos caused by fatigue crack growth. Chaos, Solitons & Fractals, 16, (5), (2003), pp. 651–659. https://doi.org/10.1016/s0960-0779(02)00449-6.

T. Li, S. T. Lie, and Y. B. Shao. Fatigue and fracture strength of a multi-planar circular hollow section TT-joint. Journal of Constructional Steel Research, 129, (2017), pp. 101–110. https://doi.org/10.1016/j.jcsr.2016.11.001.

P. Arora, P. K. Singh, V. Bhasin, K. K. Vaze, A. K. Ghosh, D. M. Pukazhendhi, P. Gandhi, and G. Raghava. Predictions for fatigue crack growth life of cracked pipes and pipe welds using RMS SIF approach and experimental validation. International Journal of Pressure Vessels and Piping, 88, (10), (2011), pp. 384–394. https://doi.org/10.1016/j.ijpvp.2011.07.003.

Z. Mikulski and T. Lassen. Fatigue crack initiation and subsequent crack growth in fillet welded steel joints. International Journal of Fatigue, 120, (2019), pp. 303–318. https://doi.org/10.1016/j.ijfatigue.2018.11.014.

P. Arora, P. K. Singh, V. Bhasin, K. K. Vaze, D. M. Pukazhendhi, P. Gandhi, and G. Raghava. Fatigue crack growth behavior in pipes and elbows of carbon steel and stainless steel materials. Procedia Engineering, 55, (2013), pp. 703–709. https://doi.org/10.1016/j.proeng.2013.03.318.

A. Fatemi and R. Molaei. Novel specimen geometries for fatigue testing of additive manufactured metals under axial, torsion, and combined axial-torsion loadings. International Journal of Fatigue, 130, (2020). https://doi.org/10.1016/j.ijfatigue.2019.105287.

J. Fischer, P. J. Freudenthaler, P. R. Bradler, and R. W. Lang. Novel test system and test procedure for fatigue crack growth testing with cracked round bar (CRB) specimens. Polymer Testing, 78, (2019), p. 105998. https://doi.org/10.1016/j.polymertesting.2019.105998.

X. Zheng, X. Zhang, L. Ma,W.Wang, and J. Yu. Mechanical characterization of notched high density polyethylene (HDPE) pipe: Testing and prediction. International Journal of Pressure Vessels and Piping, 173, (2019), pp. 11–19. https://doi.org/10.1016/j.ijpvp.2019.04.016.

D. Jısa, P. Liskutın, T. Kruml, and J. Polak. Small fatigue crack growth in aluminium alloy EN-AW 6082/T6. International Journal of Fatigue, 32, (12), (2010), pp. 1913–1920. https://doi.org/10.1016/j.ijfatigue.2010.06.003.

K. Kluger. Fatigue life estimation for 2017A-T4 and 6082-T6 aluminium alloys subjected to bending-torsion with mean stress. International Journal of Fatigue, 80, (2015), pp. 22–29. https://doi.org/10.1016/j.ijfatigue.2015.05.005.

V. L. Neelakantha, T. Jayaraju, P. Naik, D. Kumar, and C. R. Rajashekar. Determination of fracture toughness and fatigue crack growth rate using circumferentially cracked round bar specimens of Al2014T651. Aerospace Science and Technology, 47, (2015), pp. 92–97. https://doi.org/10.1016/j.ast.2015.09.023.

V. Chaves, G. Beretta, J. A. Balbın, and A. Navarro. Fatigue life and crack growth direction in 7075-T6 aluminium alloy specimens with a circular hole under biaxial loading. International Journal of Fatigue, 125, (2019), pp. 222–236. https://doi.org/10.1016/j.ijfatigue.2019.03.031.

BS EN 1999-1-3:2007. Eurocode 9: Design of aluminum structures, Part 1-3: Structures susceptible to fatigue. British Standard.

P. Schaumann and S. Steppeler. Fatigue tests of axially loaded butt welds up to very high cycles. Procedia Engineering, 66, (2013), pp. 88–97. https://doi.org/10.1016/j.proeng.2013.12.065.

J. Maljaars, M. Lukic, and F. Soetens. Comparison between the Eurocode for fatigue of steel structures, EN 1993-1-9, and the Eurocode for fatigue of aluminium structures, EN 1999-1-3. In 5th International Conference on Fatigue Design, Elsevier, (2013), pp. 34–48.

Q. Sun, H. N. Dui, and X. L. Fan. A statistically consistent fatigue damage model based on Miner’s rule. International Journal of Fatigue, 69, (2014), pp. 16–21. https://doi.org/10.1016/j.ijfatigue.2013.04.006.

S. P. Zhu, D. Liao, Q. Liu, J. A. F. O. Correia, and A. M. P. De Jesus. Nonlinear fatigue damage accumulation: isodamage curve-based model and life prediction aspects. International Journal of Fatigue, 128, (2019). https://doi.org/10.1016/j.ijfatigue.2019.105185.

J. P. Dias, S. Ekwaro Osire, A. Cunha Jr, S. Dabetwar, A. Nispel, F. M. Alemayehu, and H. B. Endeshaw. Parametric probabilistic approach for cumulative fatigue damage using double linear damage rule considering limited data. International Journal of Fatigue, 127, (2019), pp. 246–258. https://doi.org/10.1016/j.ijfatigue.2019.06.011.




DOI: https://doi.org/10.15625/0866-7136/15512 Display counter: Abstract : 59 views. PDF : 20 views.

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