发表机构
Beihang University; Politecnico di Milano; Sun Yat-sen University; China Academy of Aerospace System and Innovation（北京航空航天大学; 米兰理工大学; 中山大学; 中国航天系统创新研究院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过离散元-多体模拟，发现早期高速穿透器动力学能有效约束小行星风化层颗粒杨氏模量，为缩小颗粒刚度范围提供数值依据。
AI 中文摘要
碎石堆小行星风化层的力学性质仍缺乏约束，因为接触响应既取决于材料性质，也取决于局部颗粒构型。本研究探讨早期高速穿透器动力学能否约束颗粒刚度（以颗粒杨氏模量 E 表示），在受控离散元模型中进行。采用双向耦合的 EDEM-Adams 离散元-多体模型筛选六个参数：杨氏模量、泊松比、恢复系数、静摩擦系数、滚动摩擦系数和粘附强度。随后在一个沉降颗粒床中相同的 17 个空间位置测试五个杨氏模量水平，共进行 85 次模拟，实现跨模量水平的位置匹配比较。在 75-90 m/s 速度范围内，改变杨氏模量在探针减速中产生最清晰且最系统的差异，而其他参数在测试范围内影响较弱。通过每次留出一个位置的所有模量案例进行验证，表明早期响应在区分宽模量范围方面比相邻模量水平更具信息量。介观分析将响应差异归因于杨氏模量增加时集中的界面载荷共享和空间延伸的三维高容量接触路径。结果为从高速穿透响应中缩小颗粒杨氏模量范围提供了数值基础，尽管存在局部颗粒变异性。对真实小行星风化层的定量应用需要进一步的实验验证。
英文摘要
Mechanical properties of rubble-pile asteroid regolith remain poorly constrained because contact responses depend on both material properties and local particle configuration. This study examines whether early-time high-speed penetrator dynamics can constrain particle stiffness, represented by the particle Young's modulus E, within a controlled discrete-element model. A bidirectionally coupled EDEM-Adams discrete-element-multibody model is used to screen six parameters: Young's modulus, Poisson's ratio, coefficient of restitution, static friction coefficient, rolling friction coefficient, and adhesion strength. Five Young's-modulus levels are then tested at the same 17 spatial locations in one settled granular bed, giving 85 simulations with location-matched comparisons across modulus levels. Within the 75-90 m s^-1 speed range, varying Young's modulus yields the clearest and most systematic differences in probe deceleration, whereas the other parameters have weaker effects over the tested ranges. Validation by withholding all modulus cases at one location in turn indicates that the early response is more informative for distinguishing broad modulus ranges than adjacent modulus levels. Mesoscale analysis links the response differences to concentrated interface load sharing and spatially extended three-dimensional high-capacity contact paths as Young's modulus increases. The results provide a numerical basis for narrowing the particle Young's-modulus range from high-speed penetration responses despite local granular variability. Quantitative application to real asteroid regolith requires further experimental validation.
Comments40 pages
