Abstract
For isotropic material structure, the stress in the vicinity of crack tip is generally much higher than the stress far away from it. This phenomenon usually leads to stress concentration and fracture of structure. Previous researches and studies show that the stress intensity factor is one of most important parameter for crack growth and propagation. This paper provides a convenient numerical method, which is called hybrid photoelasticity method, to accurately determine the stress field distribution in the vicinity of crack tip and mixed-mode stress intensity factors. The model was simulated by finite element method and isochromatic data along straight lines far away from the crack tip were calculated. By using the isochromatic data obtained from finite element method and a conformal mapping procedure, stress components and photoelastic fringes in the hybrid region were calculated. To easily compare calculated photoelastic fringes with experiment results, the fringe patterns were reconstructed, doubled and sharpened. Good agreement shows that the method presented in this paper is reliable and convenient. This method can then directly be applied to obtain mixed mode stress intensity factors from the experimentally measured isochromatic data along the straight lines.
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This paper was recommended for publication in revised form by Associate Editor Vikas Tomar
Tae Hyun Baek received a B.S degree in Mechanical Engineering from Hanyang University in 1971. Then he received his M.S degree in 1984 and Ph. D degree in 1986 from Iowa State University in USA, respectively. Dr. Baek is currently a professor of Mechanical and Automotive Engineering at Kunsan National University, Jeonbuk, Korea. Prof. Baek’s research interests include experimental stress analysis, finite element method and numerical analysis, etc.
Lei Chen received a B.S degree in Mechanical Engineering from Qingdao Ocean University in 2002. Then he received his M.S degree from Ocean University of China in 2006. Mr. Chen is currently a Ph.D. candidate at the graduate school of Kunsan National University, in Kunsan city, Korea. Mr. Chen’s research interests include stress analysis, experimental mechanics and topology optimization, etc.
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Baek, T.H., Chen, L. & Hong, D.P. Hybrid determination of mixed-mode stress intensity factors on discontinuous finite-width plate by finite element and photoelasticity. J Mech Sci Technol 25, 2535–2543 (2011). https://doi.org/10.1007/s12206-011-0740-1
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DOI: https://doi.org/10.1007/s12206-011-0740-1