Structural Engineering and Mechanics

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Dynamic fracture instability in brittle materials: Insights from DEM simulations

  • Kou, Miaomiao (School of Civil Engineering, Qingdao University of Technology) ;
  • Han, Dongchen (School of Civil Engineering, Qingdao University of Technology) ;
  • Xiao, Congcong (China Resources Land Ltd.) ;
  • Wang, Yunteng (Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone)
  • Received : 2019.01.14
  • Accepted : 2019.03.20
  • Published : 2019.07.10
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Abstract

In this article, the dynamic fracture instability characteristics, including dynamic crack propagation and crack branching, in PMMA brittle solids under dynamic loading are investigated using the discrete element method (DEM) simulations. The microscopic parameters in DEM are first calibrated using the comparison with the previous experimental results not only in the field of qualitative analysis, but also in the field of quantitative analysis. The calibrating process illustrates that the selected microscopic parameters in DEM are suitable to effectively and accurately simulate dynamic fracture process in PMMA brittle solids subjected to dynamic loads. The typical dynamic fracture behaviors of solids under dynamic loading are then reproduced by DEM. Compared with the previous experimental and numerical results, the present numerical results are in good agreement with the existing ones not only in the field of qualitative analysis, but also in the field of quantitative analysis. Furthermore, effects of dynamic loading magnitude, offset distance of the initial crack and initial crack length on dynamic fracture behaviors are numerically discussed.

Keywords

Acknowledgement

Supported by : Graduate Scientific Research and Innovation foundation of Chongqing

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