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文件名称:STUDYOFNUMERICAL AND PHYSICAL FRACTURE
文件大小:404KB
文件格式:PDF
更新时间:2015-02-22 11:26:48
method, physical fracture, numerical fracture
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.