arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.6877astro-ph.EPastro-ph.IMcond-mat.mtrl-sciphysics.chem-phphysics.space-ph
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尘埃撞击太阳探测器数值模拟的状态方程和本构模型

Equation of State and Constitutive Models for Numerical Simulations of Dust Impacts on the Solar Probe

Gerald I. Kerley

摘要:

本报告提出了新的EOS和强度模型,用于对NASA太阳探测器空间飞行器的灰尘影响进行数值水文代码模拟。该航天器将受到速度高达300公里/秒的撞击,产生高达100 TPa的压力和高达200 eV的温度。因此,材料模型必须处理各种物理和化学现象,包括固体-固体转变,熔化和蒸发,化学反应,电子激发和电离。EOSPro代码用于开发包含这些效应的表格式EOS。该报告讨论了用于创建六种材料的新EOS表和本构模型的理论方法-Al 2 O3,两种多孔碳材料,熔融SiO2,硅橡胶弹性体和锗-将用于热保护罩(TPS)和太阳能电池,这些组件最容易受到灰尘的影响。它还介绍了流体模拟的结果,灰尘的TPS和玻璃目标的影响。它讨论了辐射对EOS的贡献的重要性以及在撞击过程中Al 2 O3和碳之间反应的重要性。它为额外的工作提出了建议,包括测试水代码模拟的准确性和可靠性以及改进和校准材料模型的实验。

英文摘要:

This report presents new EOS and strength models for use in numerical hydrocode simulations of dust impacts on the NASA solar probe space vehicle. This spacecraft will be subjected to impact at velocities up to 300 km/s, producing pressures as high as 100 TPa and temperatures as high as 200 eV. Hence the material models must treat a variety of physical and chemical phenomena, including solid-solid transitions, melting and vaporization, chemical reactions, electronic excitation and ionization. The EOSPro code is used to develop tabular EOS that include these effects. The report discusses the theoretical methods used to create the new EOS tables and constitutive models for six materials--Al2O3, two porous carbon materials, fused SiO2, a silicone elastomer, and germanium--which will be used in the thermal protection shield (TPS) and solar cells, the components most vulnerable to dust impacts. It also presents the results of hydrocode simulations of dust impacts on the TPS and on glass targets. It discusses the importance of radiation contributions to the EOS and the importance of reactions between Al2O3 and carbon during impacts. It makes recommendations for additional work, including experiments for testing the accuracy and reliability of the hydrocode simulations as well as for improving and calibrating the material models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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