Experimental investigations on fatigue crack growth of repaired thick aluminium panels in mixed-mode conditions

被引:10
|
作者
Hosseini-Toudeshky, H. [1 ]
Bakhshandeh, S. [1 ]
Mohammadi, B. [1 ]
Daghyani, H. R. [1 ]
机构
[1] Amirkabir Univ Technol, Dept Aerosp Engn, Tehran, Iran
关键词
repair; composite; mixed-mode; crack; aluminium panel;
D O I
10.1016/j.compstruct.2006.04.021
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In this paper, experimental fatigue crack growth of thick aluminium panels containing a central inclined crack of 45 degrees repaired with single-side glass/epoxy composite patch are performed. It is shown that, the technique of single-side repair using glass/epoxy composite patch is effective in the crack growth life extension of the thick panels in mixed-mode conditions. It is also shown that the crack-front of the propagated cracks of the repaired panels has a curvilinear shape which is the effect of the existed out-of-plane bending due to the asymmetry conditions in the single-side repaired panels. It is indicated that the crack propagation path at patched surface is different from the un-patched surface of the panels. In the primary stages of the crack growth, the crack surfaces through the thickness, in the vicinity of the mid-plane propagate without surface twisting. There are considerable differences between the obtained crack growth path at patched and un-patched surfaces of the panels which mean that the crack propagation surfaces have three-dimensional patterns. Using the various thin patch lay-ups has minor effects on the crack re-initiation life of the repaired thick panels. It is shown that using various four layers patch lay-up configurations, the crack propagation life of the cracked panels may increase by the order of 30-85%. The most fatigue crack growth life extension belongs to the repaired panel with the patch lay-up of [90](4). (C) 2006 Elsevier Ltd. All rights reserved.
引用
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页码:437 / 443
页数:7
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