新旧硅石压碎曲线实验对比：在Dimorphos基准撞击模拟中的应用
New versus past silica crush curve experiments: application to Dimorphos benchmarking impact simulations
AI总结：
本文通过回顾并补充硅石压碎实验，提出一种适用于微颗粒硅石类似材料撞击模拟的新幂律压碎曲线，并以DART撞击Dimorphos为基准案例证明其比常用二次曲线更精确且具有普适性。
摘要：
压碎曲线对于小型多孔天体物理体的数值模拟具有根本重要性。经验文献通常针对硅石颗粒测量压碎曲线，不同研究采用了各种方法、尺寸、质地和压力条件。本文回顾了以往研究并补充了进一步的实验，以建立对硅石压碎曲线行为的全面且总体性的理解。我们提出了一种新的幂律函数，可用于类似于微颗粒硅石的模拟材料的撞击模拟。我们开展了一项基准研究，以DART撞击小行星Dimorphos的研究案例为基础，将这一新的压碎曲线与其他研究中常用的参数化二次压碎曲线进行比较。我们发现，典型的二次压碎曲线参数并未紧密跟随硅石压碎实验，因此它们在撞击点附近低估了压缩，而在远离撞击点处高估了压缩。本文提出的新压碎曲线适用于几百帕至1.1 GPa之间的压力，因此可能更为精确。此外，它不依赖特定案例参数进行校准，在假定成分类似于微颗粒硅石的情况下，可普遍用于彗星状或小行星状天体。
英文摘要：
Crush curves are of fundamental importance to numerical modeling of small and porous astrophysical bodies. The empirical literature often measures them for silica grains, and different studies have used various methods, sizes, textures, and pressure conditions. Here we review past studies and supplement further experiments in order to develop a full and overarching understanding of the silica crush curve behavior. We suggest a new power-law function that can be used in impact simulations of analog materials similar to micro-granular silica. We perform a benchmarking study to compare this new crush curve to the parametric quadratic crush curve often used in other studies, based on the study case of the DART impact onto the asteroid Dimorphos. We find that the typical quadratic crush curve parameters do not closely follow the silica crushing experiments, and as a consequence they under (over) estimate compression close (far) from the impact site. The new crush curve presented here, applicable to pressures between a few hundred Pa and up to 1.1 GPa, might therefore be more precise. Additionally, it is not calibrated by case-specific parameters, and can be used universally for comet- or asteroid-like bodies, given an assumed composition similar to micro-granular silica.
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