Dybizbański Maciej Adam, Rzeszut Katarzyna, Abdusattarkhuja Saydiolimkhon, Li Zheng
Faculty of Civil and Transport Engineering, Poznań University of Technology, 5 Marii Skłodowskiej-Curie Str., 60-965 Poznań, Poland.
Institute of Civil Engineering, Technische Universität Berlin, G.-Meyer-Alle 25, 13355 Berlin, Germany.
Materials (Basel). 2024 Dec 9;17(23):6022. doi: 10.3390/ma17236022.
The main aim of the study was the determination of the strength parameters of composite bonded joints consisting of galvanised steel elements, an adhesive layer, and Carbon-Fiber-Reinforced Plastic (CFRP) fabric. For this purpose, shear laboratory tests were carried out on 60 lapped specimens composed of 2 mm thick hot-dip galvanised steel plates of S350 GD. The specimens were overlapped on one side with SikaWrap 230 C carbon fibre textile (CFT) using SikaDur 330 adhesive. The tests were carried out in three series that differed in overlap length (15 mm, 25 mm, and 35 mm). A discussion on the failure mechanism in the context of the bonding capacity of the composite joint was carried out. We observed three forms of joint damage, namely, at the steel-adhesive interface, fibre rupture, and mixed damage behaviour. Moreover, an advanced numerical model using the commercial finite element (FE) program ABAQUS/Standard and the coupled cohesive zone model was developed. The material behaviour of the textile was defined as elastic-lamina and the mixed-mode Hashin damage model was implemented with bi-linear behaviour. Special attention was focused on the formulation of reliable methodologies to determine the load-bearing capacity, failure mechanisms, stress distribution, and the strength characteristics of a composite adhesive joint. In order to develop a reliable model, validation and verification were carried out and self-correlation parameters, which brought the model closer to the laboratory test, were proposed by the authors. Based on the conducted analysis, the strength characteristics including the load-bearing capacity, failure mechanisms, and stress distribution were established. The three forms of joint damage were observed as steel-adhesive interface failure, fibre rupture, and mixed-damage behaviour. Complex interactions between the materials were observed. The most dangerous adhesive failure was detected at the steel and adhesive interface. It was also found that an increase in adhesive thickness caused a decrease in joint strength. In the numerical analysis, two mechanical models were employed, namely, a sophisticated model of adhesive and fabric components. It was found that the fabric model was very sensitive to the density of the finite element mesh. It was also noticed that the numerical model referring to the adhesive layer was nonsensitive to the mesh size; thus, it was regarded as appropriate. Nevertheless, in order to increase the reliability of the numerical model, the authors proposed their own correlation coefficients α and β, which allowed for the correct mapping of adhesive damage.
本研究的主要目的是确定由镀锌钢构件、粘结层和碳纤维增强塑料（CFRP）织物组成的复合粘结接头的强度参数。为此，对60个搭接试件进行了剪切实验室试验，这些试件由厚度为2mm的S350 GD热浸镀锌钢板制成。试件一侧使用西卡杜尔330粘结剂与西卡Wrap 230 C碳纤维织物（CFT）搭接。试验分三个系列进行，搭接长度不同（15mm、25mm和35mm）。针对复合接头粘结能力的失效机理进行了讨论。我们观察到接头损伤的三种形式，即在钢-粘结剂界面处、纤维断裂以及混合损伤行为。此外，还使用商业有限元（FE）程序ABAQUS/Standard和耦合粘结区模型开发了一个先进的数值模型。织物的材料行为被定义为弹性层合材料，并采用双线性行为的混合模式Hashin损伤模型。特别关注了确定复合粘结接头承载能力、失效机理、应力分布和强度特性的可靠方法的制定。为了开发一个可靠的模型，进行了验证和核实，作者提出了自相关参数，使模型更接近实验室试验。基于所进行的分析，确定了包括承载能力、失效机理和应力分布在内的强度特性。观察到接头损伤的三种形式为钢-粘结剂界面失效、纤维断裂和混合损伤行为。观察到材料之间存在复杂的相互作用。在钢和粘结剂界面处检测到最危险的粘结失效。还发现粘结剂厚度的增加会导致接头强度降低。在数值分析中，采用了两种力学模型，即粘结剂和织物部件的精细模型。发现织物模型对有限元网格密度非常敏感。还注意到，涉及粘结层的数值模型对网格尺寸不敏感；因此，它被认为是合适的。然而，为了提高数值模型的可靠性，作者提出了自己的相关系数α和β，这使得能够正确映射粘结剂损伤。
