A realistic model for transverse shear stiffness prediction of composite corrugated-core sandwich elements
A realistic model for transverse shear stiffness prediction of composite corrugated-core sandwich elements
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DOI：
10.1016/j.ijsolstr.2017.09.020
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发表时间：
2017-12-15
影响因子：
3.6
通讯作者：
Al-Emrani, M.
中科院分区：
文献类型：
--
作者：
Atashipour, S. R.;Al-Emrani, M.
波纹芯夹层元件的横向剪切刚度的几个先前的研究已经表明，现有的分析公式显着高估了这个属性，特别是当这些轻质元件是由复合材料子元件。由于近来复合材料夹层元件在许多应用领域中的广泛制造和使用，需要更精确和可靠的公式。本文提出了一个精确的分析模型，用于预测具有波纹结构芯层的复合材料夹层结构的横向剪切刚度。考虑了包括面板和芯的子元件的定向材料性质的影响，以及子元件的复合材料成分中的低剪切模量的影响。结果表明，波纹腹板芯单元的横向剪切刚度大大低于现有公式预测的横向剪切刚度。本解决方案提供了更现实的结果，特别是当波纹芯夹层由具有低剪切模量的复合材料成分制成时。针对一种新型木复合地板的实例，对不同复合材料选择时，面板和芯材的主要正交异性材料取向的不同组合进行了比较研究。结果表明，芯层的主要正交各向异性材料取向的平面方向对横向剪切刚度有显著影响，而面的方向影响较小。几个有限元比较，以确保开发的配方的可靠性。研究和讨论了忽略剪切变形对夹层单元横向剪切刚度分量的影响随夹层单元几何参数变化的重要性。(C)2017爱思唯尔有限公司版权所有
Several previous studies of the transverse shear stiffness of corrugated-core sandwich elements have demonstrated that the existing analytical formulations significantly overestimate this property, especially when these lightweight elements are made of composite sub-elements. Due to the recent widespread fabrication and use of composite sandwich elements in many fields of application, a more accurate and reliable formulation is needed. This paper deals with an accurate analytical model for predicting the transverse shear stiffness of composite sandwich elements with a structural corrugated core. The effect of the directional material properties of the sub-elements, including face sheets and core, as well as the effect of a low shear modulus in composite material constituents of the sub-elements, is taken into account. It is shown that the transverse shear stiffness of corrugated web core elements is considerably lower than that predicted by the existing formulations. The present solution provides much more realistic results, especially when the corrugated-core sandwich is made of composite constituents with low shear moduli. Different combinations of the main orthotropic material orientation of the faces and core are studied comparatively for different composite material choices corresponding to an innovative timber composite floor case. It is demonstrated that the planar direction of the main orthotropic material orientation of the core has a significant influence on transverse shear stiffness, whereas that of the faces is less important. Several finite element comparisons are made to ensure the reliability of the developed formulation. The importance of the disregarded shear deformation effects on the transverse shear stiffness component versus different geometrical parameters of the sandwich element is studied and discussed. (C) 2017 Elsevier Ltd. All rights reserved.