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A refined global-local approach for evaluation of singular stress field based on scaled boundary finite element method

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Abstract

A refined global-local approach based on the scaled boundary finite element method (SBFEM) is proposed to improve the accuracy of predicted singular stress field. The proposed approach is carried out in conjunction with two steps. First, the entire structure is analyzed by employing an arbitrary numerical method. Then, the interested region, which contains stress singularity, is re-solved using the SBFEM by placing the scaling center right at the singular stress point with the boundary conditions evaluated from the first step imposed along the whole boundary including the side-faces. Benefiting from the semi-analytical nature of the SBFEM, the singular stress field can be predicted accurately without highly refined meshes. It provides the FEM or other numerical methods with a rather simple and convenient way to improve the accuracy of stress analysis. Numerical examples validate the effectiveness of the proposed approach in dealing with various kinds of problems. © 2017 Published by Elsevier Ltd on behalf of Chinese Society of Theoretical and Applied Mechanics.

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China

    Lin Pang

  2. Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China

    Gao Lin & Zhiqiang Hu

Authors
  1. Lin Pang
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  2. Gao Lin
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  3. Zhiqiang Hu
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Correspondence to Lin Pang.

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Pang, L., Lin, G. & Hu, Z. A refined global-local approach for evaluation of singular stress field based on scaled boundary finite element method. Acta Mech. Solida Sin. 30, 123–136 (2017). https://doi.org/10.1016/j.camss.2017.03.006

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