Local shear strength distribution of ultrasonically welded hybrid Aluminium to CFRP joints
Local shear strength distribution of ultrasonically welded hybrid Aluminium to CFRP joints
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DOI：
10.1016/j.compstruct.2020.112481
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发表时间：
2020-09-15
影响因子：
6.3
通讯作者：
Balle, Frank
中科院分区：
文献类型：
--
作者：
Staab, Florian;Liesegang, Moritz;Balle, Frank
本文提出了一种方法来评估的局部分布的搭接剪切强度的超声波焊接单搭接接头的铝和纤维增强热塑性塑料，也表现出足够的抗老化或电化学腐蚀的连接区。这两个过程的特点和微观评价的断裂表面表明，强度分布不均匀的连接区域，是由粘合剂和凝聚力的分数。为了进行评估，开发了两个程序，将连接区细分为多个部分，并分别对其进行调查。随后，可以使用数学运算来确定接合区域中的局部强度分布。在这种解释的帮助下，可以识别和分配不同的键合机制。除了力学研究外，还使用有限元模拟来计算根据承载横截面的接头的应力分布，以验证实验数据。尽管几何形状发生了变化，例如由于钻孔，但计算的应力分布模式没有变化。
This paper presents an approach to evaluate the local distribution of lap shear strength in the joining zone of ultrasonically welded single lap joints of aluminum and fiber-reinforced thermoplastics, which also show a sufficient resistance against ageing or galvanic corrosion. Both the characteristics of the process and the microscopic evaluation of the fracture surfaces suggest that the strength is distributed inhomogeneously over the joining area and is composed of adhesive and cohesive fractions. For this evaluation, two procedures were developed to subdivide the joining zone into sections and to investigate them separately. Subsequently, a local strength distribution in the joining area can be determined using mathematical operations. With the help of this interpretation, different bonding mechanisms can be identified and assigned. Additionally to mechanical investigation, Finite Element simulations were used to calculate the stress distribution of the joints depending on the carrying cross section to validate the experimental data. Despite the change of the geometry e.g. due to drilling, the calculated stress distribution pattern did not change.