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首页> 外文期刊>Materials science forum >The X-Ray Micro-Tomography Backed by Molecular Dynamics Simulations in the Analysis of Shock-Induced Damage in Ductile Materials
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The X-Ray Micro-Tomography Backed by Molecular Dynamics Simulations in the Analysis of Shock-Induced Damage in Ductile Materials

机译：分子动力学模拟支持的X射线断层扫描技术在延性材料冲击引起的损伤分析中的应用

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The authors refer to the damage process caused by spallation in single crystal of metals shocked at very high strain rate. Our work has been devoted to understanding, and predicting the ductile damage processes of nucleation, growth and coalescence of voids in these extreme conditions of impact. Examination of recovered sample after shock indicates only final state of damage while the Molecular Dynamics (MD) calculations describe the phenomenon over time. However we need experimental results to validate and improve simulations and models. Analysis of X-ray microtomographies is appropriate to extract pore volume distributions. Our study on ductile materials allowed us to conclude that experimental analyses exhibit two power laws attributed to growth and coalescence regimes. Moreover power law is scale invariance so it is possible to compare experiment (macroscopic) to calculation (microscopic). We show that there are good correlations between experimental and MD pore volume distribution. Both X-ray microtomographies and MD findings aids to progress in understanding the phenomenon of dynamic damage.
机译：作者提到了由以非常高的应变率震荡的金属单晶中的剥落引起的破坏过程。我们的工作致力于理解和预测在这些极端冲击条件下空洞的成核，生长和聚结的延性破坏过程。冲击后对回收的样品进行的检查仅表明损坏的最终状态，而分子动力学（MD）计算则描述了随时间变化的现象。但是，我们需要实验结果来验证和改进仿真和模型。 X射线显微断层照相术的分析适合提取孔体积分布。我们对延性材料的研究使我们可以得出结论，实验分析显示出两个归因于生长和聚结机制的幂定律。此外，幂律是尺度不变性，因此可以将实验（宏观）与计算（微观）进行比较。我们表明，实验和MD孔体积分布之间具有良好的相关性。 X射线断层摄影术和MD检查都有助于了解动态损伤现象。

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