Two-variables shear theory for bio-inspired helicoidal composite and carbon nanotube-reinforced composite beams resting on a general viscoelastic Winkler-Pasternak foundation

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-10-16 DOI:10.1016/j.istruc.2025.110444

Ngoc-Duong Nguyen , Van-Tai Bui , Trung-Kien Nguyen , Thuc P. Vo

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引用次数: 0

Abstract

This paper presents a Hermite polynomial-based two-variable shear theory and a Ritz method for analysing the buckling, bending, free vibration, and damped vibration of carbon nanotube-reinforced composite (CNTRC) and bio-inspired helicoidal composite (BIHC) beams. These beams rest on a general viscoelastic Winkler-Pasternak foundation characterised by four parameters, incorporating the stiffness and damping effects of both the Winkler and Pasternak layers. The foundation model can be simplified into traditional forms such as Winkler, Pasternak, or their viscoelastic variants. Numerical examples are provided to validate the proposed Ritz method and theory. Additionally, the influences of lamination stacking sequence, slenderness ratio, material anisotropy, boundary conditions, and the four foundation parameters on the structural behaviour of CNTRC and BIHC beams are examined in detail. The results demonstrate that foundation effects play a crucial role in the mechanical behaviour of BIHC and CNTRC beams, with the Pasternak foundation model exerting a more significant influence than the Winkler model. This study also presents the first-ever analysis of damped vibration behaviour for these structures, providing novel insights into how foundation properties and damping interact to affect structural vibration. These findings advance the understanding necessary for applying BIHC and CNTRC beams in engineering designs where vibration and damping effects are critical.

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基于一般粘弹性温克勒-帕斯捷尔纳克地基的仿生螺旋复合材料和碳纳米管增强复合材料梁的双变量剪切理论

本文提出了基于Hermite多项式的双变量剪切理论和Ritz方法，用于分析碳纳米管增强复合材料（CNTRC）和仿生螺旋复合材料（BIHC）梁的屈曲、弯曲、自由振动和阻尼振动。这些梁建立在一般的粘弹性温克勒-帕斯捷尔纳克基础上，该基础具有四个参数，结合了温克勒和帕斯捷尔纳克层的刚度和阻尼效应。基础模型可以简化为传统的形式，如Winkler、Pasternak或它们的粘弹性变体。数值算例验证了Ritz方法和理论的正确性。此外，还详细分析了层叠顺序、长细比、材料各向异性、边界条件和4个基础参数对CNTRC和BIHC梁结构性能的影响。结果表明，基础效应对BIHC和CNTRC梁的受力行为起着至关重要的作用，其中帕斯捷尔纳克基础模型的影响比Winkler模型更显著。本研究还首次对这些结构的阻尼振动行为进行了分析，为基础特性和阻尼如何相互作用影响结构振动提供了新的见解。这些发现促进了在振动和阻尼效应至关重要的工程设计中应用BIHC和CNTRC梁的必要理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.