Regularization of torsional stresses in tubular lap bonded joints by means of functionally graded adhesives
Regularization of torsional stresses in tubular lap bonded joints by means of functionally graded adhesives
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DOI：
10.1016/j.ijadhadh.2014.01.006
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发表时间：
2014-09-01
影响因子：
3.4
通讯作者：
Dragoni, E.
中科院分区：
文献类型：
--
作者：
Spaggiari, A.;Dragoni, E.
本文介绍了一种功能模量梯度胶粘剂（FGA）的管状单搭接接头在扭转下的应力分析。粘合剂技术在结构应用中提供了几个优点，例如粘合不同的材料，但在胶层中存在严重的应力集中，这通常会引发断裂现象。为了克服这些问题，可以使用具有分布在聚合物内部的纳米颗粒的FGA，如最近在技术文献中提出的。研究的目的是找出最佳的胶层刚度，使应力趋于均匀。分析的特殊几何形状允许一个简单的分析方法，因为管上的纯扭转不会引起任何弯曲，并且没有泊松效应在粘合剂中产生剥离应力，因此只考虑剪切应力。这项工作首先开发的方程，其中支配的剪切应力分布在粘合剂，然后通过迫使剪切应力是恒定的是能够找出这是刚度分布沿着胶层。提供了FGA层刚度沿沿着的轴向分布，并讨论了其对弹性几何参数的依赖性。本文的研究结果可用于定制的增强分布，假设一个连续变化的胶粘剂刚度。(C)2014爱思唯尔有限公司版权所有。
This paper describes the analytical stress analysis of a tubular single lap joint under torsion with a functionally graded modulus adhesive (FGA). The adhesive technology offers several advantages in structural applications, such as bonding dissimilar materials, but suffers from severe stress concentrations in the bondline which often act as a trigger for fracture phenomena. To overcome these problems, FGA with nanoparticles distributed inside the polymer can be used, as proposed recently in technical literature. The aim of the work is to retrieve which is the optimal stiffness of the adhesive layer to regularize the stresses. The peculiar geometry analyzed permits a straightforward analytical approach since pure torsion on tubes do not cause any bending and no Poisson's effect creates peel stress in the adhesive, therefore only shear stress are to be considered. The work first develops the equations which govern the shear stress distribution in the adhesive and then by forcing the shear stress to be constant is able to find out which is the stiffness profile along the bondline. The axial distribution of the stiffness of the FGA layer along the overlap is provided and the dependence on the elasto-geometrical parameters is discussed. The findings of the paper can be used to tailor the reinforcement distribution, under the hypothesis of a continuously changing adhesive stiffness. (C) 2014 Elsevier Ltd. All rights reserved.