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Transient response and crack propagation of polymerbonded explosive under launching environment(PDF)


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Transient response and crack propagation of polymerbonded explosive under launching environment
Sun HongShen YunianChen Tao
School of Science,Nanjing University of Science and Technology,Nanjing 210094,China
launching environment viscoelastic-statistical crack model polymer bonded explosive dynamic response crack distribution
O34; TJ5
In order to provide accurate explosive dynamic response data for the safety evaluation of explosive projectiles under launching environment,the viscoelastic-statistical crack constitutive model is developed and applied to the numerical calculation of transient response of cracked viscoelastic composite under impact loading. The fourth order Runge-Kutta method is used to decouple the constitutive equations in the form of ordinary differential equations,the corresponding sub modules are compiled and embedded into the nonlinear finite element calculation program by the Fortran language. The correctness of the method is verified by comparing numerical results with the experimental data. The numerical results show that the crack growth is stable at 110 s after launching,and at this time the effective stress at the edge position and the center position of the two ends of the explosive column are greater than those at other places,consequently it leads to the average crack radius of these locations being larger than that of other parts. It is also found that the crack growth rate is lower than the propagation velocity of stress waves. The radius of crack begins to increase when the stress of a disturbance point reaches its peak value.


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Last Update: 2019-04-26