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Application a direct/cohesive zone method for the evaluation of scarf adhesive joints
Applied Adhesion Science Pub Date : 2018-12-20 , DOI: 10.1186/s40563-018-0115-2
D. F. O. Silva , R. D. S. G. Campilho , F. J. G. Silva , U. T. F. Carvalho

With the increasing use of structures with adhesive bonds at the industrial level, several authors in the last decades have been conducting studies concerning the behaviour and strength of adhesive joints. Between the available strength prediction methods, cohesive zone models, which have shown good results, are particularly relevant. This work consists of a validation of cohesive laws in traction and shear, estimated by the application of the direct method, in the strength prediction of joints under a mixed-mode loading. In this context, scarf joints with different scarf angles (α) and adhesives of different ductility were tested. Pure-mode cohesive laws served as the basis for the creation of simplified triangular, trapezoidal and exponential laws for all adhesives. Their validation was accomplished by comparing the numerical maximum load (Pm) predictions with the experimental results. An analysis of peel (σ) and shear (τ) stresses in the adhesive layer was also performed to understand the influence of stresses on Pm. The use of the direct method allowed obtaining very precise Pm predictions. For the geometric and material conditions considered, this study has led to the conclusion that no significant Pm errors are incurred by the choice of a less appropriate law or by uncoupling the loading modes.

中文翻译:

应用直接/内聚区方法评估围巾胶接点

随着在工业水平上越来越多地使用带有粘合剂的结构,在过去的几十年中,几位作者一直在进行有关粘合剂接头的行为和强度的研究。在可用的强度预测方法之间,显示出良好结果的内聚区模型尤其重要。这项工作包括对在混合模式载荷下接头强度预测中应用直接方法估算的牵引力和剪切力内聚规律进行验证。在这种情况下,测试了具有不同围巾角度(α)的围巾接头和具有不同延展性的粘合剂。纯模式内聚法则是为所有粘合剂创建简化的三角,梯形和指数法则的基础。他们的验证是通过将最大数值载荷(Pm)预测值与实验结果进行比较来完成的。还对粘合层中的剥离应力(σ)和剪切应力(τ)进行了分析,以了解应力对Pm的影响。直接方法的使用允许获得非常精确的Pm预测。对于所考虑的几何条件和材料条件,本研究得出的结论是,通过选择不太合适的定律或取消耦合加载模式,不会引起显着的Pm误差。
更新日期:2018-12-20
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