基于离散元方法的颗粒材料缓冲性能及影响因素分析
发布时间：2019-06-12 18:44
【摘要】：在冲击荷载作用下,颗粒材料通过颗粒间的摩擦及非弹性碰撞可有效进行能量耗散实现缓冲作用.本文采用离散元方法对冲击载荷下颗粒材料的缓冲过程进行数值分析,研究不同厚度下颗粒材料的缓冲性能.计算结果表明:颗粒层厚度H是影响颗粒材料缓冲性能的关键因素,并存在一个临界厚度H_c.当HH_c时,冲击力随H的增加而降低;当HH_c时,冲击力对H的变化不敏感并趋于稳定值.此外,在不同颗粒摩擦系数和初始密集度下对缓冲过程的离散元分析表明,光滑和疏松颗粒材料具有更好的缓冲性能.最后,对颗粒材料在冲击过程中的力链结构和底板的压力分布进行了讨论,以揭示颗粒材料缓冲性能的内在机理.
[Abstract]:Under impact load, the energy dissipation of particle materials can be effectively realized by friction and inelastic collision between particles. In this paper, the buffering process of particulate materials under impact load is analyzed by discrete element method, and the cushioning performance of particulate materials under different thickness is studied. The results show that the thickness of particle layer H is the key factor affecting the cushioning performance of particulate materials, and there is a critical thickness H 鈮，
本文编号：2498222
[Abstract]:Under impact load, the energy dissipation of particle materials can be effectively realized by friction and inelastic collision between particles. In this paper, the buffering process of particulate materials under impact load is analyzed by discrete element method, and the cushioning performance of particulate materials under different thickness is studied. The results show that the thickness of particle layer H is the key factor affecting the cushioning performance of particulate materials, and there is a critical thickness H 鈮，
本文编号：2498222
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