| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Understanding and Predicting Dynamic Behavior of Materials
|
| Presentation Title |
Anisotropic Damage Model for Cyclotrimethylene Trinitramine (RDX) under Impact |
| Author(s) |
Nisha Mohan |
| On-Site Speaker (Planned) |
Nisha Mohan |
| Abstract Scope |
Dynamic, high strain rate experiments on oriented single crystals of the explosive cyclotrimethylene trinitramine (RDX) have demonstrated the effects of elastic and plastic anisotropy on its deformation processes. We have developed a brittle, discrete fracture model that takes into account material and stress state anisotropy.Material anisotropy is represented through three effects, the elastic and plastic anisotropic stiffness and the anisotropic surface energies obtained from atomistic simulations.Crack growth mechanics is developed from Griffith’s theory of elliptical cracks. The energetic dependence on the inelastic part of deformation is added in terms of plastic dissipation potential to the Griffith criterion.Inelastic hardening effects in the vicinity of crack-tip were included by hardening the moduli as a function of the plasticity.Fracture planes were deduced from the directional form of the criterion.The ability to derive the right fracture angles and crack lengths were assessed against recent split Hopkinson pressure bar experiments on single crystals. |
| Proceedings Inclusion? |
Undecided |