EPJ Web of Conferences 183, 01059 (2018)
https://doi.org/10.1051/epjconf/201818301059

Development of a constitutive model for DPX2 explosive

¹ QinetiQ, Fort Halstead, Sevenoaks, Kent, TN14 7BP, UK
² QinetiQ, Bristol Business Park, Coldharbour Lane, Bristol, BS16 1FJ, UK
³ Surface, Microstructure & Fracture Group, Cavendish Laboratory, JJ Thomson Ave, Cambridge, CB3 0HE, UK.

^* Corresponding author: pjgould@qinetiq.com

Published online: 7 September 2018

Abstract

There is a significant challenge in simulating the behaviour of PBXs under high strain rate impact loading. A Porter-Gould physically based constitutive model has been developed for the DPX2 explosive. A series of quasi-static compression and tensile tests over a range of temperatures were performed together with DMA tests to calibrate the model. In particular tests were performed for different L/D ratios to understand the complex localisation and damage behaviour of the material. High rate tests on the compression Split Hopkinson Pressure Bar (SHPB) for a range of temperatures were then used for validation of the model under idealised stress states. Some model development is still required, particularly at lower temperatures near the glass transition temperature. In addition a series of classical Taylor Tests were used to validate the model under impact loading conditions at room temperature. The DYNA3D simulations gave very good results compared to the experiments for these impact conditions.