Iranian Scientific Association of Energetic Materials

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Due to the importance of determining the pelastic manner of thin wall shells against the explosive loading, up to the maximum process of deformation, examining the manner of this kind of structures is on the agenda.concidering repeated reaction of explosive shock wave from two ends and the walls of the structure, pressure distribution derived from explosion of explosive in closed shells, is too complicated. in this article with concidering the simpled pressure distribution profile, a mathematical model is presented for determining the maximum deformation of closed shells.in order to verifying this model, some experimental tests are designed and implemented on three scales of aluminium shells with cone-cylinder in two different materials. Also these deformations are compared with Johnes theoretical model related to long cylinders. Finally due to the difference of the geometric shape of the shells, in both theoretical and experimental modes, according to no dimensional number, presented by Zhao, one semi-experimental model is given for predicting the maximum deformation of this kind of shells under explosive loading.

Keywords: blast loading, explosive, conical-cylindical shells, Zhao damage, semi-experimental model

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