An investigation into the crack initiation and propagation behaviour of bonded single-lap joints using backface strain
An investigation into the crack initiation and propagation behaviour of bonded single-lap joints using backface strain
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DOI：
10.1016/j.ijadhadh.2008.07.008
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发表时间：
2009-06-01
影响因子：
3.4
通讯作者：
Wahab, M. M. Abdel
中科院分区：
文献类型：
--
作者：
Shenoy, V.;Ashcroft, I. A.;Wahab, M. M. Abdel
本文采用背面应变（BFS）测量技术研究了单搭接胶接接头在等幅疲劳载荷作用下的疲劳损伤。BFS图中的不同区域与接头中的损伤相关，通过部分疲劳接头中的损伤和开裂的微观表征，并与各种裂纹扩展情况的3D有限元分析（FEA）进行比较。在较低的疲劳载荷下，裂纹萌生占主导地位，而在较高的疲劳载荷下，裂纹扩展占主导地位。使用BFS和疲劳寿命测量结果，提出了一个简单的预测模型，该模型根据疲劳载荷将疲劳寿命划分为不同的区域。该模型可用于与实验BFS测量，以确定在疲劳寿命期间的损伤进展的不同区域的关节的剩余寿命。(C)2008爱思唯尔有限公司保留所有权利。
In this paper, the backface strain (BFS) measurement technique is used to characterise fatigue damage in single-lap adhesive joints subjected to constant amplitude fatigue loading. Different regions in the BFS plots are correlated with damage in the joints through microscopic characterisation of damage and cracking in partially fatigued joints and comparison with 3D finite element analysis (FEA) of various crack growth scenarios. Crack initiation domination was found at lower fatigue loads whereas crack propagation dominated at higher fatigue loads. Using the BFS and fatigue life measurement results, a simple predictive model is proposed which divides the fatigue lifetime into different regions depending upon the fatigue load. The model can be used with experimental BFS measurements to determine the residual life of the joint in different regions of damage progression during the fatigue life. (C) 2008 Elsevier Ltd. All rights reserved.