标题： 压缩导致密集多分散颗粒的膨胀和致密化 显示英文标题

标题： Compression Causes Expansion and Compaction of the Jammed Polydisperse Particles

摘要： 本研究关注由于机械退火引起的多分散颗粒材料的膨胀，该过程包括压缩和膨胀。 经过轻微退火后，多分散系统表现出压实，以及粒径均匀的系统也表现出压实。 然而，经过大量退火后，仅观察到多分散系统发生膨胀。 压力历史和结构分析表明，这种膨胀是由于颗粒的尺寸分选所致。 我们将这种分选归因于粒径依赖的有效吸引力。 本研究的结果强调了多分散颗粒中堆积分数和结构的强烈历史依赖性，并揭示了一种由势能驱动的分选机制。 显示英文摘要

摘要： This study focused on the expansion in polydisperse granular materials owing to mechanical annealing, which involved compression and decompression. Following minor annealing, the polydisperse systems exhibited compaction as well as the systems having uniform-sized particles. However, following extensive annealing, only the polydisperse systems were observed to expand. Pressure history and structure analysis indicated that this expansion results from the size segregation of the particles. We attribute this segregation to particle-size-dependent effective attraction. The results of this study highlight the strong history dependence of the packing fraction and structure in polydisperse particles and reveal a potential-energy-driven segregation mechanism.