A Method of Computer Numerical Modeling of Mechanical Response of Energetic Materials to Confined Triaxial Dynamic Compression
Zhang Yuanchong, Yin Minn, Han Xiaoping,Shen Yapeng
(Xi'an Jiaotong University, Xi'an, 710049)

Abstract: On the basis of the experimental curves of energetic materials, such as explosives and propellants etc., under the uniaxial and triaxial compressions, a method of computer numerical modeling combining these curves is presented to determine the dynamic compression behaviours (Poisson's ratio¦Í, yield limit Y etc.) of the materials. In order to model the experimemtal curves under the conditions of the triaxial confined compressions, a finite element model with the Coulomb's friction contact element for the sample-steel cylinder system is established to evaluate the effect of the friction force between the cylindrical surface of the energetic material sample and the inner wall of the confining cylinder on the experimental date. Using a commercial FE code, a TNT explosive sample-steel cylinder system is analyzed under the confined triaxial dynamic compression at about 3s^£­£± strain rate and the Poisson ratio ¦Íof the TNT and the friction coefficient f are obtained. It has been shown that the computer numerical modeling can provide an effective approach for determining the import ant dynamic mechanical properties of energetic materials.
Keywords: energetic materials, dynamic behaviour, finite element method, confined triaxial compression.