Abstract The paper presents a new modeling technique for accurately predicting the complex behavior of thin-walled open and closed section beams made of fiber-reinforced laminated composite materials. The new modeling technique is significantly computational-efficient compared to detailed finite element modeling. In this technique, the complete 3D stress analysis problem consisting of all effects and their couplings is systematically decomposed into a 2D problem applicable to the beam section, and a 1D problem applicable along the beam length. The capability of the technique is not only suitable for thin-walled beams but also applicable for modeling beams with solid, thick-walled sections as well as thin/thick-walled composite beams with in-filled materials. To analyze beams with any arbitrary cross-sectional geometry, a 2D finite element (FE) model is used for solving the 2D sectional problem, while the 1D problem for the global load response of the beams is solved by a 1D FE model utilizing the sectional stiffness parameters obtained from the 2D model. The proposed technique is validated using experimental and numerical results, which show the excellent performance of the model. New results for a range of beam sections are developed using the presented method and validated against detailed FE modeling.

中文翻译：

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开放或封闭横截面以及有或没有填充材料的层合复合薄壁梁的有效模型

摘要 本文提出了一种新的建模技术，用于准确预测由纤维增强层压复合材料制成的薄壁开闭截面梁的复杂行为。与详细的有限元建模相比，新的建模技术具有显着的计算效率。在该技术中，由所有效应及其耦合组成的完整 3D 应力分析问题被系统地分解为适用于梁截面的 2D 问题和适用于沿梁长度的 1D 问题。该技术的能力不仅适用于薄壁梁，而且适用于具有实体、厚壁截面的梁以及具有填充材料的薄/厚壁复合梁的建模。要分析具有任意横截面几何形状的梁，2D 有限元 (FE) 模型用于解决 2D 截面问题，而梁的全局载荷响应的 1D 问题通过利用从 2D 模型获得的截面刚度参数的 1D FE 模型来解决。使用实验和数值结果验证了所提出的技术，这表明该模型具有优异的性能。使用所提出的方法开发了一系列梁截面的新结果，并针对详细的有限元建模进行了验证。