Finite Element Analysis of Stress Wave Propagation in Adhesive Joints under Low Speed Impact Tensile Loadings,Macromolecular Theory and Simulations

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Finite Element Analysis of Stress Wave Propagation in Adhesive Joints under Low Speed Impact Tensile Loadings
Macromolecular Theory and Simulations ( IF 1.8 ) Pub Date : 2020-10-21 , DOI: 10.1002/mats.202000066
Yuqiong Xu _{1,

2} , Yiming Ke ₃ , Xiaoqiang Ma _{1,

2}

Affiliation

The adhesive joints are suddenly disturbed by the impact loadings in industrial applications. The stress wave propagation and stress distribution in the single lap joint (SLJ) with aluminum alloy adherends and two types of epoxy adhesives under impact tensile loadings are analyzed with the finite element method (FEM) to simulate the drop weight test. The impact velocity is assumed below 2000 mm s⁻¹ and the total impact history is 0.2 ms. The stress is observed throughout the middle plane in the overlap area. The stress wave propagation in the adhesive layer reveal obvious directivity and show the transformation from the elastic wave to the plastic wave. The equivalent Von‐Mises stress increases approximately linearly with the increase of impact energy. At different times, the equivalent Von‐Mises stress along the adhesive longitude present bimodal distribution, while the stress wave propagation characterizes the rising‐falling‐rising trend. The stress singularity area is around 3–5 mm from edges. The equivalent Von‐Mises stress of the transversal middle plane in the adhesive layer is sensitive to rupture with the symmetrical distribution. A damage sensitive area located 2.6 mm away from both edges. The upper interface of the adhesive layer may initiate failure under the low‐velocity impact.

中文翻译：

低速冲击拉伸载荷下胶接接头应力波传播的有限元分析

在工业应用中，冲击力突然使胶粘接头受到干扰。采用有限元方法（FEM）分析了铝合金搭接件和两种环氧胶粘剂在单搭接接头（SLJ）中的应力波传播和应力分布，以模拟跌落重量试验。假定冲击速度低于2000 mm s ^-1总冲击历史为0.2毫秒。在重叠区域的整个中间平面观察到应力。应力波在粘合剂层中的传播显示出明显的方向性，并显示出从弹性波到塑性波的转变。等效冯·密塞斯应力随冲击能量的增加而近似线性增加。在不同的时间，沿着粘合经度的等效冯-密斯应力呈现双峰分布，而应力波的传播则表征了上升-下降-上升趋势。应力奇异区域距边缘约3–5 mm。胶粘剂层中横向中间平面的等效冯-密斯应力对具有对称分布的破裂敏感。损坏敏感区域距离两个边缘2.6毫米。

更新日期：2020-10-21

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