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Since 1978 Published in Sarov (Arzamas-16), Nizhegorodskaya oblast |
RUSSIAN FEDERAL NUCLEAR CENTER -
ALL-RUSSIAN RESEARCH INSTITUTE OF EXPERIMENTAL PHYSICS |
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Русский | English
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MODIFIED KINETIC MODEL OF BRITTLE SPALLATION
O. A. Tyupanova VANT. Ser.: Mat. Mod. Fiz. Proc 2015. Вып.2. С. 40-48.
The kinetic model of brittle spallation (NAG type) has been modified for the accounting of the temperature factor effect on the metal resistance to pulse tension. The modification has been carried out by the introduction of the temperature dependences of three model parameters. Previously these parameters - threshold presures of micro-crack nucleation and qrowth, as well as viscosity - were considered as constants. The paper shows that using the modified model enables the correct description of the pure iron spallation process within the temperature range of T = 273÷1 025 К and within the shock range σ = 1÷13 GPa, where the change of the fracture character is registered (from brittle to viscous). Keywords: brittle spallation, temperature effect, modified model, iron.
| USING VARIOUS COMPUTING GRID TRANSFORMATIONS IN THE TIM-2D TECHNIQUE
A. I. Panov, A. V. Shurygin VANT. Ser.: Mat. Mod. Fiz. Proc 2015. Вып.2. С. 78-87.
The algorithms used for various transformations of unstructured polygonal grid in the TIM-2D technique and for preparation of initial data for this technique are described. The provided examples show the way the transformations are performed both separately and in composition. We also provide practical recommendations on the use of different transformations depending on the type of the structure and special features of the problem solving. Keywords: TIM-2D technique, non-structured grid, geometric transformations, initial data calculation.
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