Composite materials, particularly honeycomb composites, are widely utilized in various industries, including aerospace, due to their high energy absorption against the impact and exceptional strength-to-weight ratio. This study aims to leverage the plastic and elastic properties of these materials to develop a simplified numerical model that incorporates orthotropic properties for core modeling. By doing so, the need for detailed honeycomb structure modeling is eliminated, resulting in reduced computational costs and time. A comprehensive three-dimensional finite element model, accounting for structural intricacies, is presented based on experimental data from a reputable source (isotropic model) and its equivalent finite element model (orthotropic model). The model is validated by the experimental results, demonstrating good agreement. The study also investigates parameters such as energy absorption, the internal energy of the core and faces, maximum displacement, and maximum contact force under low-velocity impact scenarios with spherical and cylindrical projectiles. These findings highlight the effectiveness of the orthotropic model, particularly in showcasing greater energy absorption in the core of the sandwich panel when subjected to a cylindrical impactor.

中文翻译：

---

使用正交各向异性芯简化和基于有限元的方法对蜂窝夹芯板进行有效均匀化：比较研究

复合材料，特别是蜂窝复合材料，由于其对冲击的高能量吸收和出色的强度重量比，被广泛应用于包括航空航天在内的各个行业。本研究旨在利用这些材料的塑性和弹性特性来开发一个简化的数值模型，其中包含用于核心建模的正交各向异性特性。通过这样做，消除了对详细蜂窝结构建模的需要，从而减少了计算成本和时间。基于来自可靠来源的实验数据（各向同性模型）及其等效有限元模型（正交各向异性模型），提出了考虑结构复杂性的综合三维有限元模型。实验结果验证了该模型，表现出良好的一致性。该研究还研究了球形和圆柱形射弹在低速撞击情况下的能量吸收、核心和面的内能、最大位移和最大接触力等参数。这些发现强调了正交各向异性模型的有效性，特别是在受到圆柱形冲击器影响时，夹芯板的核心显示出更大的能量吸收。