Equivalent properties for corrugated cores of sandwich structures: A general analytical method
Equivalent properties for corrugated cores of sandwich structures: A general analytical method
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DOI：
10.1016/j.compstruct.2013.10.012
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发表时间：
2014-02-01
影响因子：
6.3
通讯作者：
Pierini, Marco
中科院分区：
文献类型：
--
作者：
Bartolozzi, Giorgio;Baldanzini, Niccolo;Pierini, Marco
波纹夹芯结构作为多功能构件在许多工业领域得到越来越广泛的应用。为了进行高效的有限元分析，夹层结构可以表示为多层二维连续体。为此，通常将形状复杂的岩心表示为正交各向异性均质层。因此，挑战是确定等效材料的机械性能，以准确地模拟夹层结构。文献中有几种方法，但解析公式仅适用于特定类型的岩心。本文提出了一种描述等效材料的一般解析公式。该方法的通用性在于它能够模拟每一种波纹几何形状，克服了现有解析公式的主要局限性。对梁式和壳式夹层结构进行了建模。考虑到离面性质的重要性，我们研究了Reissner-Mindlin表示的所有参数。此外，非对称波纹轮廓也很容易加工。由于它的通用性，该方法通过与以前作者在最常见的波纹几何形状上的广泛比较来验证。此外，当结果不一致时，建立有限元模拟来验证所提出的公式的精度和准确性。(C)2013爱思唯尔有限公司。保留所有权利。
Corrugated core sandwich structures are increasingly used as multi-functional components in many industrial areas. In order to perform efficient finite element analysis, the sandwich construction can be represented as a multi-layer two-dimensional continuum. To do so, the complex shaped core is usually represented as an orthotropic homogeneous layer. The challenge is therefore to determine the mechanical properties of the equivalent material to accurately model the sandwich structure. Several methods exist in the literature, but analytical formulations are only available for specific types of core. In this paper, a general analytical formulation to characterize the equivalent material is proposed. The generality of the proposed approach consists in its ability to model every corrugation geometry, overcoming the main limitation of existing analytical formulations. Both beam and shell sandwich structures are modeled. Given the importance of the out-of-plane properties, all parameters for a Reissner-Mindlin representation are studied. Moreover, also non-symmetric corrugation profiles are easily processed. Thanks to its versatility, the method is validated by means of an extensive comparison with previous authors on the most common corrugation geometries. In addition, when agreement is not found on results, finite element simulations are set up to prove the precision and accuracy of the proposed formulation. (C) 2013 Elsevier Ltd. All rights reserved.