A novel approach for displacement and stress monitoring of sandwich structures based on the inverse Finite Element Method
A novel approach for displacement and stress monitoring of sandwich structures based on the inverse Finite Element Method
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DOI：
10.1016/j.compstruct.2015.02.081
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发表时间：
2015-09-01
影响因子：
6.3
通讯作者：
Tessler, Alexander
中科院分区：
文献类型：
--
作者：
Cerracchio, Priscilla;Gherlone, Marco;Tessler, Alexander
从离散位置应变测量实时重建位移和应力场是监测系统的基本特征，这通常被称为形状和应力感测。本文提出的是一种计算效率高的形状和应力传感方法，非常适合于应用层压复合材料和夹层结构。新方法采用逆有限元法（iFEM）作为一般框架和细化锯齿理论（RZT）作为基础板理论。使用C-0离散，三节点逆板有限元制定。该元素配方，使强大的和有效的建模板结构仪表与应变传感器，具有任意位置。该方法导致一组线性代数方程组，有效地解决了未知的节点位移。然后，这些位移在有限元水平上用于计算全场应变和应力，这些应变和应力又可用于评估结构完整性。多层，高度异质层压板的数值结果表明，这种新的配方形状和应力传感的独特能力。(C)2015爱思唯尔有限公司版权所有。
The real-time reconstruction of the displacement and stress fields from discrete-location strain measurements is a fundamental feature for monitoring systems, which is generally referred to as shape- and stress-sensing. Presented herein is a computationally efficient shape- and stress-sensing methodology that is ideally suited for applications to laminated composite and sandwich structures. The new approach employs the inverse Finite Element Method (iFEM) as a general framework and the Refined Zigzag Theory (RZT) as the underlying plate theory. Using a C-0-discretization, a three-node inverse plate finite element is formulated. The element formulation enables robust and efficient modeling of plate structures instrumented with strain sensors that have arbitrary positions. The methodology leads to a set of linear algebraic equations that are solved efficiently for the unknown nodal displacements. These displacements are then used at the finite element level to compute full-field strains and stresses that may be in turn used to assess structural integrity. Numerical results for multilayered, highly heterogeneous laminates demonstrate the unique capability of this new formulation for shape- and stress-sensing. (C) 2015 Elsevier Ltd. All rights reserved.