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用于模拟具有厚胶粘剂层的扁平复合材料被粘物之间粘结接头的内聚参数识别

Identification of the Cohesive Parameters for Modelling of Bonded Joints between Flat Composite Adherends with Thick Layer of Adhesive.

作者信息

Bernardin Petr, Sedlacek Frantisek, Kozak Josef, Kucerova Ludmila, Lasova Vaclava

机构信息

Faculty of Mechanical Engineering, University of West Bohemia in Pilsen, Univerzitni 2732/8, 301 00 Plzen, Czech Republic.

出版信息

Materials (Basel). 2024 Oct 4;17(19):4880. doi: 10.3390/ma17194880.

DOI:10.3390/ma17194880
PMID:39410451
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11478280/
Abstract

The failure of bonded composite materials is accompanied by specific failure modes. These are specifically Mode I, Mode II, Mode III, and their combination (so-called mixed mode). These modes depend on the direction and type of loading. The mechanical properties describing the damage initiation and the damage evolution are unique according to the type of adhesive and present mode of failure. However, a few research studies have focused on an adhesive thicknesses greater than 0.2 mm. The main objective of this research is to investigate the mechanical properties of a bonded joint with large adhesive thickness loaded according to Modes I and II. The observed failure parameters, the cohesive and damage parameters, are identified by minimizing the difference between the force-displacement diagram obtained from the experimental data for both Mode I and Mode II. The finite element model is confronted with these parameters and is evaluated based on their agreement. Compared to other studies with a small adhesive layer thickness, the values of failure parameters are lower. The results show that the adhesive thickness has an influence on the values of cohesive and damage parameters and that these parameter values decrease significantly compared to a small adhesive thickness. The obtained parameters can be further used to predict the fracture toughness of other bonded joints loaded in any direction.

摘要

粘结复合材料的失效伴随着特定的失效模式。这些模式具体为模式I、模式II、模式III以及它们的组合（所谓的混合模式）。这些模式取决于加载的方向和类型。根据胶粘剂的类型和当前的失效模式，描述损伤起始和损伤演化的力学性能是独特的。然而，一些研究聚焦于大于0.2毫米的胶粘剂厚度。本研究的主要目的是研究在模式I和模式II加载下具有大胶粘剂厚度的粘结接头的力学性能。通过最小化模式I和模式II实验数据所得力-位移图之间的差异，确定观察到的失效参数、内聚参数和损伤参数。有限元模型与这些参数相对照，并根据它们之间的一致性进行评估。与其他胶粘剂层厚度小的研究相比，失效参数的值更低。结果表明，胶粘剂厚度对内聚参数和损伤参数的值有影响，并且与小胶粘剂厚度相比，这些参数值显著降低。所获得的参数可进一步用于预测在任何方向加载的其他粘结接头的断裂韧性。

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