Blast and impact loading paper
Das, S, Shen, L 2014, 'Experimental and numerical investigation of dynamic failure of sandstone under high strain rates', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. II, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 1057-1062. ISBN: 9780994152008.
The response of brittle materials such as rock at high strain rate loading is essential to understanding material failure under extreme loading conditions. Such knowledge is very important to engineering applications such as block cave mining, fracking, etc. In this paper an existing rate dependent damage model, specially developed for rock, is implemented into finite element software ABAQUS, as a user defined subroutine. Following this model, strain rate dependent tensile damage in sandstone is modelled using a scalar damage parameter to indicate the degradation of material properties. On the other hand, the dynamic compressive behaviour of sandstone is captured by the Drucker-Prager (DP) model. For the purpose of model calibration, quasi-static compression test and Split Hopkinson Pressure Bar experiments under strain rates up to 325 s-1 are performed. Simulation with the combined tensile damage and DP model of the published spall experiment yielded good prediction of fragment locations and strength. Thus using the combined tensile damage and DP model, dynamic rate dependent behaviour of sandstone can be effectively studied.