Failure Mode Analysis of Aluminium Alloy 2024-T3 in Double-Lap Bolted Joints with Single and Double Fasteners; A Numerical and Experimental Study
Failure Mode Analysis of Aluminium Alloy 2024-T3 in Double-Lap Bolted Joints with Single and Double Fasteners; A Numerical and Experimental Study
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DOI：
10.3390/ma8063195
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发表时间：
2015-06-01
期刊：
影响因子：
3.4
通讯作者：
Oskouei, Reza H.
中科院分区：
文献类型：
--
作者：
Fallahnezhad, Khosro;Steele, Andrew;Oskouei, Reza H.
本文旨在研究Al 2024-T3在双搭接螺栓连接中的力学行为和破坏模式。为了实现这一目标，研究了几何参数对单、双紧固件两种结构的影响。利用ABAQUS/Standard建立了三维有限元模型，并与节点受拉载荷的试验结果进行了对比验证。总的来说，双螺栓连接比单螺栓连接具有更大的承载能力（40%-49%）。在单螺栓节点中，板宽对节点抗拉性能的影响不显著；而增大孔距边缘的距离，接头强度显著提高。在双螺栓连接中，改变边缘距离对连接的行为几乎没有影响。然而，将板宽从25.4 mm增加到30 mm，承载能力提高了28%。研究表明，在单螺栓连接中，随着边缘距离的增加，破坏模式有利于由剪切破坏向承载破坏转变。同时，采用更宽板（增加宽度）的双螺栓连接有利于将破坏模式从净张拉转变为承载。发现几何参数对控制螺栓连接的破坏模式起着重要作用，从而防止螺栓连接出现净张拉和剪切的灾难性破坏模式。
This paper aims to study the mechanical behaviour and failure mode of Al 2024-T3 in double-lap bolted joints. To accomplish this, the effect of geometric parameters was investigated in both configurations of single and double fasteners. Using ABAQUS/Standard, a three-dimensional finite element model was developed and verified against the experimental results of the joints loaded in tension. In general, double bolt joints were found to have greater load carrying capacities than single bolt joints (by 40%-49%). In single bolt joints, the plate width had insignificant effect on the behaviour of the joint under tensile loading; whereas, increasing the distance of the hole from the edge, considerably enhanced the strength of the joint. In double bolt joints, changing the edge distance had almost no effect on the behaviour of the joint. However, increasing the plate width from 25.4 to 30 mm increased the load carrying capacity by 28%. This study showed that in single bolt connections, with increasing the edge distance, the failure mode can favourably shift from shear-out to bearing. Also, double bolt joints with wider plates (increased width) can beneficially shift the failure mode from net-tension to bearing. The geometric parameters were found to play an important role in controlling the failure mode so that catastrophic failure modes of net-tension and shear-out can be prevented in bolted joint.