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- 저자 : Gennadiy P. Nikishkov (검색결과 2 건)
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Growth simulation for 3D surface and through-thickness cracks using SGBEM-FEM alternating method
박재학,Gennadiy P. Nikishkov 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.9
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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박재학(Jai Hak Park),Gennadiy P. Nikishkov 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A SGBEM-FEM alternating method is extended to analyze a through-thickness crack problem. The effect of shape of boundary element mesh on the accuracy of stress intensity factor is examined. It is noted that the fictitious portion of the boundary element mesh, which is located outside the body, plays an important role in the method. Also the effect of the boundary condition imposed on the edge of boundary element mesh is examined. In order to check the accuracy of the method, we considered a sample problem of a through-thickness crack with unequal surface lengths. The obtained stress intensity factors are compared with the known solutions or the results obtained from finite element method. Using the proposed method stress corrosion crack growth simulation is performed for a through-thickness crack with unequal surface lengths.
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