【摘要】：在沖擊荷載作用下,顆粒材料通過(guò)顆粒間的摩擦及非彈性碰撞可有效進(jìn)行能量耗散實(shí)現(xiàn)緩沖作用.本文采用離散元方法對(duì)沖擊載荷下顆粒材料的緩沖過(guò)程進(jìn)行數(shù)值分析,研究不同厚度下顆粒材料的緩沖性能.計(jì)算結(jié)果表明:顆粒層厚度H是影響顆粒材料緩沖性能的關(guān)鍵因素,并存在一個(gè)臨界厚度H_c.當(dāng)HH_c時(shí),沖擊力隨H的增加而降低;當(dāng)HH_c時(shí),沖擊力對(duì)H的變化不敏感并趨于穩(wěn)定值.此外,在不同顆粒摩擦系數(shù)和初始密集度下對(duì)緩沖過(guò)程的離散元分析表明,光滑和疏松顆粒材料具有更好的緩沖性能.最后,對(duì)顆粒材料在沖擊過(guò)程中的力鏈結(jié)構(gòu)和底板的壓力分布進(jìn)行了討論,以揭示顆粒材料緩沖性能的內(nèi)在機(jī)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，

本文編號(hào)：2498222