【作者】 黄滟； 刘土光； 肖汉林； 余晓菲；

【Author】 HUANG Yan, LIUTu-guang, XIAO Han-lin, ZHANG Tao (College of Traffic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074,China)

【机构】 华中科技大学交通科学与工程学院；

【摘要】 本文讨论了不同材料模型、几何尺寸(壳长和壳体厚度)、冲击速度、应变率以及初始缺陷对圆柱壳动态屈曲响应的影响。利用LS-DYNA大型动力软件对轴向冲击作用下圆柱壳的动力屈曲的全过程进行了计算机模拟,给出了屈曲模态发展过程以及指定时刻的应变沿壳长分布图等。本文研究表明,材料塑性硬化模量对圆柱壳的屈曲模式的影响较大。同时几何尺寸、冲击速度、材料应变率敏感性以及初始缺陷都会对圆柱壳屈曲模式产生一定的影响。更多还原

【Abstract】 The influence of material properties, shell length and thick, impact velocity, material strain rate effects and initial imperfections on dynamic buckling response of cylindrical shells subjected to axial impact is studied. A numerical simulation of the impact event was carried out using the FE code ANSYS8.0/ LS-DYNA version 970. Model our structure in ANSYS, obtain the explicit dynamic solution via LS-DYNA. The development of the buckling shape with time of a shell having a given geometry subjected to axial impact and strains along the shell mid-surface at several times for different material approximations were given and compared. It is shown that initiation of buckling is sensitive to the material properties, particularly to the hardening modulus. Shell geometry, impact velocity, material strain rate effects and initial imperfections also influence the initial instability pattern and the final buckling shape of a shell.更多还原