Strength and sintering effects at ejection of explosively driven sand

18th APS-SCCM; 24th AIRAPT

Resnyansky, A.D.^1 ; Weckert, S.A.^1

Weapons and Countermeasures Division, DSTO, PO Box 1500, Edinburgh

SA

5111, Australia^1

关键词: Complex materials;    High explosive charge;    Highly porous silica;    Material modeling;    Shock response;    Shock-wave loading;    Sintering effect;    Two-phase model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/19/192016/pdf
DOI  :  10.1088/1742-6596/500/19/192016

来源: IOP

【 摘 要 】

A description of the response of sand to extreme loads is very important for the evaluation of the sand ejecta impact effects on various targets. Sand is a complex material to simulate because of its porosity where the inter-phase equilibrium is hard to achieve under transient shock wave loading. A previously developed two-phase model with strength has been implemented in CTH and applied to sand. The shock response of the sand, including the Hugoniot abnormality known from the literature for highly porous silica, is adequately described with the material model. The sand unloading effects appearing as the ejecta are observed in the present work using dynamic flash X-ray of an aluminium target plate loaded by limestone sand ejecta from the detonation of a buried high explosive charge. The CTH modelling results compared with the flash X-ray images have demonstrated good agreement, particularly, in the description of momentum transfer to the target.