Experimental characterization and modelling of adhesive bonded joints under static and non-monotonic fracture loading in the mode II regime

Lamberti, Marco; Maurel-Pantel, Aurélien; Lebon, Frédéric

doi:10.1016/j.ijadhadh.2023.103394

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…In this section, the steps are illustrated that led to the formulation of the imperfect interface model. The theoretical model is obtained by homogenization techniques and by asymptotic methods in the context of small perturbation coupling of unilateral contact and damage [18,19,[22][23][24][25][26].…”

Section: Imperfect Interface Modelmentioning

confidence: 99%

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Mechanical Performance of Adhesive Connections in Structural Applications

Lamberti,

Maurel-Pantel,

Lebon

2023

Materials

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Adhesive bonding is an excellent candidate for realising connections for secondary structures in structural applications such as offshore wind turbines and installations, avoiding the risk and associated welding problems. The strength of the adhesive layer is an important parameter to consider in the design process it being lower than the strength capacity of the bonding material. The presence of defects in the adhesive materials undoubtedly influences the mechanical behaviour of bonded composite structures. More specifically, the reduction in strength is more pronounced as the presence of defects (voids) increases. For this reason, a correct evaluation of the presence of defects, which can be translated into damage parameters, has become essential in predicting the actual behaviour of the bonded joints under different external loading conditions. In this paper, an extensive experimental programme has been carried out on adhesively bonded connections subjected to Mode I and Mode II loading conditions in order to characterise the mechanical properties of a commercial epoxy resin and to define the damage parameters. The initial damage parameters of the adhesive layer have been identified according to the Kachanov–Sevostianov material definition, which is able to take into account the presence of diffuse initial cracking.

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Section: Imperfect Interface Modelmentioning

confidence: 99%

“…The approach of the considered damage behaviour is introduced in [24,27]: a thin adhesive interphase is located between two elements (adherents) and is assumed to be a microcracked material undergoing a degradation process. Further details can be found in [26,27].…”

Section: Imperfect Interface Modelmentioning

confidence: 99%

Mechanical Performance of Adhesive Connections in Structural Applications

Lamberti,

Maurel-Pantel,

Lebon

2023

Materials

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“…Changes in the adhesive joint strength should be associated with an increased quantity of imperfections in the adhesive material occurring in the larger volume (thickness) of the adhesive joint. The inclusion of initial cracking in the design of the adhesive joint numerical model makes it possible to improve the accuracy of the results of numerical calculations compared to experimental results [19,20].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity of Adhesive Joint Properties

Anasiewicz,

Kuczmaszewski

2023

Materials

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This paper presents the results of a study of adhesive joints, focused on the heterogeneity of the properties of the adhesive material in the adhesive joint. The main objective of the study was to determine potential differences in the material properties of adhesive joints made with selected structural adhesives. Due to the impact of the joined material on the adhesive during the curing of the joint as well as the impact of phenomena occurring during the curing of the adhesive, the properties of the adhesive joint may vary along the thickness of the joint. Determining the differences in material properties over the thickness of the adhesive bond is important for more accurate prediction of adhesive bond strength in FEM simulations. In order to observe changes in the material properties of bonds, nanoindentation tests have been carried out on eight adhesive joint bonds made with common structural adhesives used to join sheets of aluminium alloy or corrosion-resistant steel. Basing on the achieved test results, load/unload curves were developed for imprints at characteristic spots of the joints. Distinct differences in the achieved average force value were observed for imprints located in the wall-adjacent zone and in the centre of the adhesive joint; this can be interpreted as areas of the joint with different material structures of higher or lower density of imperfections or porosities. Differences in the load/unload curves for ‘rigid’ and ‘flexible’ adhesives were analysed. The summary includes a conclusion that an adhesive joint is characterised by heterogeneous properties along its thickness.

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