Abstract
An SGBEM-FEM alternating method had been proposed by Nikishkov, Park and Atluri for the analysis of three-dimensional planar and non-planar cracks and their growth. The proposed method is an effective method for fatigue or stress corrosion crack growth simulation. During crack growth simulation, however, an oscillation phenomenon is observed in crack advance or stress intensity factor distribution. If oscillating amplitude in SIF or crack advance does not decrease during next increment steps, the crack growth simulation fails. In this paper several methods are examined to remove the oscillation phenomenon. As a result, it is found that smoothing in stress intensity factor distribution or in crack front geometry can remove or weaken the oscillation phenomenon. Using the smoothing techniques, stress corrosion crack growth simulation is performed for a semi-elliptical surface crack and a through-thickness crack embedded in a plate. Crack front shape and stress intensity factor distribution are obtained after each increment during the crack growth. And the depth and length of a crack are obtained as a function of time. It is noted that the SGBEM-FEM alternating method is a very effective method for SCC growth simulation for a surface crack and a through-thickness crack.
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This paper was recommended for publication in revised form by Associate Editor Chongdu Cho
Jai Hak Park received his M.S. and Ph.D. in Mechanical Engineering from KAIST. He is currently a professor at Chungbuk National University. His research interests are in the area of fracture mechanics, computational mechanics and probabilistic assessment of structure.
Gennadiy Nikishkov received his Ph.D. and D.Sc. in Computational Mechanics from the Moscow Engineering Physics Institute. He held a Professor position at the Moscow Engineering Physics Institute. Dr. Nikishkov is currently a Professor at the University of Aizu, Japan. His research interests include computational modeling, high performance computing, visualization and computer graphics.
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Park, J.H., Nikishkov, G.P. Growth simulation for 3D surface and through-thickness cracks using SGBEM-FEM alternating method. J Mech Sci Technol 25, 2335–2344 (2011). https://doi.org/10.1007/s12206-011-0528-3
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DOI: https://doi.org/10.1007/s12206-011-0528-3