Maximum pulling force of unplugging objects  imbedded in a granular packing
YAN Zi-kun, CHEN Chao-xu, SHEN Ji-bei , XIA Cheng-jie, ZHANG Jie, WANG Chun-mei
College Physics . 2024, (11): 67 .  DOI: 10.16854 /j.cnki.1000-0712.240031