复合材料科学与工程 ›› 2024, Vol. 0 ›› Issue (3): 25-34.DOI: 10.19936/j.cnki.2096-8000.20240328.004

• 基础研究 • 上一篇    下一篇

双三角点阵夹芯结构低速冲击下的动态响应与失效机制

杨思鑫, 曹忠亮*, 顾付伟   

  1. 江苏理工学院 机械工程学院,常州 213001
  • 收稿日期:2023-02-27 出版日期:2024-03-28 发布日期:2024-04-22
  • 通讯作者: 曹忠亮(1983—),男,博士,副教授,研究生导师,研究方向为复合材料夹芯板设计、铺放成型工艺等,caoliang-8302@163.com。
  • 作者简介:杨思鑫(1997—),男,硕士研究生,研究方向为复合材料夹芯结构力学性能。
  • 基金资助:
    江苏理工学院研究生实践创新计划(XSJCX22_25);江苏省高等学校自然科学研究重大项目(21KJA460004)

Dynamic response and failure mechanism of double triangular truss core sandwich structure under low velocity impact

YANG Sixin, CAO Zhongliang* , GU Fuwei   

  1. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China
  • Received:2023-02-27 Online:2024-03-28 Published:2024-04-22

摘要: 采用非线性有限元仿真方法研究双三角点阵夹芯结构抗冲击性能,使用直径为16 mm的半球形冲击器以不同的冲击能量分别对夹芯板的节点和基底位置进行冲击,研究了点阵夹芯板的失效机理和动态响应,以及各个变量对夹芯板的抗冲击性能的影响规律。结果表明:双三角点阵夹芯结构的主要失效形式为面板的基体拉伸破裂;芯子的失效形式受自身结构和受力方式影响,主要为脆性坍塌断裂和塑性变形。载荷-时间曲线表明,冲头能量与冲击位置对夹芯板的损伤失效行为有着显著的影响。相同冲击能量下,与基底冲击相比,夹芯板在节点冲击时的损伤程度及载荷峰值都更优,抗冲击性能更加优异;高冲击能量下,节点冲击的吸能效果更优,但二者载荷变化趋势却越来越相似。

关键词: 点阵夹芯结构, 有限元仿真, 抗冲击性能, 失效机制, 动态响应, 复合材料

Abstract: A nonlinear finite element simulation method was used to study the impact resistance of the double triangular truss core sandwich structure. A hemispherical impactor with a diameter of 16 mm was used to impact the nodes and substrate positions of the sandwich panel with different impact energies to study the failure mechanism and dynamic response of the truss core sandwich panel, as well as the influence law of each variable on the impact resistance of the sandwich panel. The results show that the main failure form of the double triangular truss core sandwich structure is the tensile rupture of the substrate of the panel, while the failure form of the core is influenced by its own structure and force mode, presenting mainly in the form of brittle collapse fracture and plastic deformation. The load-time curves show that the punch energy and impact location have a significant influence on the damage failure behavior of the sandwich panel. Under the same impact energy, the damage degree and load peak of sandwich panel at nodal impact are better than that of basal impact, and the impact resistance is more excellent; the energy absorption effect of nodal impact under high impact energy is better than that of basal impact, but the load change trend is increasingly similar.

Key words: nodal sandwich structure, finite element simulation, impact resistance, failure mechanism, dynamic response, composites

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