Static compression of porous dust aggregates
Static compression of porous dust aggregates
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DOI：
10.1051/0004-6361/201321325
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发表时间：
2013-03
影响因子：
6.5
通讯作者：
A. Kataoka;Hidekazu Tanaka;S. Okuzumi;K. Wada
中科院分区：
文献类型：
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作者：
A. Kataoka;Hidekazu Tanaka;S. Okuzumi;K. Wada
上下文。在原行星盘中，尘埃颗粒相互凝结，并生长形成聚集体。当这些聚集体通过凝聚生长时，它们的填充因子φ下降到φ�1；然而，这些早期小行星的残余物彗星的φ∼为0.1。因此，多孔尘埃集合体的静态压缩在小行星形成过程中很重要。然而，静态抗压强度只研究了相对高密度的集料(φ>；0.1)。目标。我们研究并发现了高孔集料(φ�1)的抗压强度。方法：研究方法。我们用粒子-粒子相互作用模型对骨料压缩进行了三维N体模拟。介绍了一种新的静态压缩方法：采用周期边界条件，使边界以低速移动靠近。粉尘集合体在周期边界上被均匀而各向同性地压缩。结果。我们经验性地推导了高孔集料的抗压强度公式(φ�1)。我们检验了抗压强度公式对大范围数值参数的有效性，如初始集料尺寸、边界速度、法向阻尼力和材料。我们还将我们的结果与以前对相对高密度区域(φ>；0.1)中静态压缩的研究进行了比较，并确认我们的结果与高密度区域的结果一致。文中还对抗压强度公式进行了解析推导。
Context. In protoplanetary disks, dust grains coagulate with each other and grow to form aggregates. While these aggregates are growing by coagulation, their filling factor φ decreases to φ � 1; however, comets, the remnants of these early planetesimals, have φ ∼ 0.1. Thus, static compression of porous dust aggregates is important in planetesimal formation. However, the static compressive strength has only been investigated for relatively high-density aggregates ( φ> 0.1). Aims. We investigate and find the compressive strength of highly porous aggregates (φ � 1). Methods. We performed three-dimensional N-body simulations of aggregate compression with a particle-particle interaction model. We introduced a new method of static compression: the periodic boundary condition was adopted, and the boundaries move with low speed to get closer. The dust aggregate is compressed uniformly and isotropically by themselves over the periodic boundaries. Results. We empirically derive a formula of the compressive strength of highly porous aggregates (φ � 1). We check the validity of the compressive strength formula for wide ranges of numerical parameters, such as the size of initial aggregates, the boundary speed, the normal damping force, and material. We also compare our results to the previous studies of static compression in the relatively high-density region ( φ> 0.1) and confirm that our results consistently connect to those in the high-density region. The compressive strength formula is also derived analytically.