Eigenfrequency Behavior of Banana/Glass/Epoxy Hybrid Composite-A Numerical and Experimental Investigation

ABSTRACT

In the present work, a finite element model in conjunction with higher-order shear deformation theory was developed to investigate the eigenfrequency responses of hybrid composite (banana-glass-epoxy) flat-panel structures. First of all, five different sets of banana-glass-epoxy hybrid composite plates were fabricated using an in-house fabrication facility. The test specimen for elastic property evaluation was prepared according to the ASTM standard. The necessary elastic properties were obtained by tensile test and utilized in numerical analysis. Furthermore, to develop the mathematical model of hybrid laminated composite, higher-order displacement kinematics were used that eliminates the consideration of shear correction factor. The model of plate was divided into several small parts using 2D nine noded elements. The elemental mass and stiffness of the panel were obtained and assembled to get the global mass and stiffness. The global values were substituted further into the governing equation derived from Hamilton principle. Furthermore, constraints conditions were imposed and the governing equation was solved to get the natural frequency. First, the numerical model’s sensitivity and accuracy were checked by stability and validation study. After that new numerical examples were solved and influences of different parameters including hybridization on frequency responses were studied and discussed in detail.

摘要

本文采用有限元模型结合高阶剪切变形理论研究了混杂复合材料 (香蕉玻璃-环氧树脂) 平板结构的本征频率响应. 首先, 使用内部制造设备制造了五组不同的香蕉玻璃-环氧树脂混杂复合板. 根据ASTM标准制备用于弹性性能评估的试样. 通过拉伸试验获得了所需的弹性性能, 并用于数值分析. 此外, 为了建立混杂层合复合材料的数学模型, 采用了高阶位移运动学, 消除了剪切修正系数的考虑. 采用二维九节点单元将平板模型划分为若干小部分. 获得了面板的基本质量和刚度, 并对其进行组装, 以获得整体质量和刚度. 将全局值进一步代入由Hamilton原理导出的控制方程中. 进一步施加约束条件, 求解控制方程, 得到固有频率. 首先, 通过稳定性和有效性研究, 检验了数值模型的敏感性和准确性. 然后, 对新的数值算例进行了求解, 并详细研究和讨论了不同参数 (包括杂化) 对频率响应的影响.

KEYWORDS:

• Natural fiber
• vibration
• natural frequency
• hybrid composite
• banana/glass fiber
• fem
• higher-order

关键词:

• 天然纤维
• 振动
• 固有频率
• 混杂复合材料
• 香蕉/玻璃纤维
• 有限元法
• 高阶

Disclosure statement

No potential conflict of interest was reported by the author(s).