CTH Implementation of a Two-Phase Material Model With Strength: Application to Porous Materials.

摘要

A material model accounting for strength developed earlier for two- phase materials is implemented in the CTH hydrocode. The strain response to load in the model is decoupled into shear and volumetric contributions in order to satisfy the model implementation requirements for CTH. Multi-phase description is realised via constitutive equations complementing the conservation laws for a material represented as a mixture of several phases. Such a formulation agrees well with the CTH code structure and is suitable for conventional user implementation. The implementation has been applied to a generic material representing sand at various porosities. The constitutive equations and equations of state have been fitted in order to describe literature data. Numerical illustrations in the report demonstrate agreement of the calculation results with the anomalous behaviour observed in the literature for a highly porous sand at shock compression and a good description of the experiments available in the literature on the explosion of a sand-buried charge.