Modeling of the thermal response of ion-treated materials.
Conference
·
OSTI ID:977919
- Robert R.
The RHEPP facility at Sandia National Laboratories offers an excellent experimental environment to study the rapid ion beam heating of materials. Its ion beams are able to create surface temperatures in materials of interest that are at or above the melting temperature with temperature gradients that can create plastic flow. These conditions lead to the formation of surface roughness in some materials but not in others. The BUCKY computer code can model the deposition of ion beams, the resulting energy transport, and the induced motion of the sample in one-dimension. The key to proper modeling of these experiments is stress/strain response at temperatures just below melting. Here the stresses induced by temperature gradients are can cause plastic strain in the material. Pure hydrodynamic calculations are not adequate to model these phenomena, because the Euler equations and energy equations must include the effects of stress. Phenomenological equations of state and strength properties that are calibrated to known properties of materials are being added to BUCKY. It is particularly important that the effect of strain rate on the material strength is included. This approach is being investigated in the modeling with BUCKY of RHEPP experiments on Tungsten and Titanium.
- Research Organization:
- Los Alamos National Laboratory
- Sponsoring Organization:
- DOE
- OSTI ID:
- 977919
- Report Number(s):
- LA-UR-04-7811
- Country of Publication:
- United States
- Language:
- English
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