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Study of numerical and physical fracture with SPH method

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Abstract

Two kinds of fractures can be observed in the SPH (smoothed particle hydrodynamics) simulations, which are the physical fracture and the numerical fracture. The physical one exists in reality, while the numerical one is fictitious. This paper presents the effects of both fractures and proposes a simple adding particle technique to avoid the numerical fracture. The real physical fracture is then figured out by using an applicable fracture criterion. Firstly, the effect of the numerical fracture on the computational accuracy is investigated by introducing the artificial fracture in a model of wave propagation. Secondly, a simple adding particle technique is proposed and validated by a three dimensional bending test. Finally, the experiments of penetration on the skin of aircrafts are simulated by both the initial SPH method and the improved method with the adding particle technique. The results show that the improved SPH method can describe the physical fracture very well with better accuracy.

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Authors and Affiliations

  1. Department of Aeronautical Structure Engineering, School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Fei Xu, Yan Zhao & Yulong Li

  2. Department of Mechanical Engineering, Tokyo University of Science, Noda, Chiba, Japan

    Masanori Kikuchi

Authors
  1. Fei Xu
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  2. Yan Zhao
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  3. Yulong Li
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  4. Masanori Kikuchi
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Corresponding author

Correspondence to Fei Xu.

Additional information

Project supported by the National Natural Science Foundation of China (No. 10577016), the 111 Project (No. B07050) and the program for 2008 New Century Excellent Talents in University (No. NCET080454).

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Xu, F., Zhao, Y., Li, Y. et al. Study of numerical and physical fracture with SPH method. Acta Mech. Solida Sin. 23, 49–56 (2010). https://doi.org/10.1016/S0894-9166(10)60006-7

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  • DOI: https://doi.org/10.1016/S0894-9166(10)60006-7

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