Moisture absorption–desorption effects in adhesive joints

Mubashar, Aamir; Ashcroft, Ian; Critchlow, Gary W.; Crocombe, A.D.

doi:10.1016/j.ijadhadh.2009.05.001

Cited by 161 publications

(64 citation statements)

References 32 publications

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“…The geometry of the modelled joint is shown in Figure 1. The experimental strength of this type of joint has been reported in [46]. The single lap joint was meshed using quadrilateral four node, incompatible mode elements, which improves the response of the mesh under bending conditions.…”

Section: Development Of Finite Element Modelmentioning

confidence: 99%

“…The element size in the adhesive layer was 0.0248 x 0.025 mm. Half of the single lap joint was modelled by considering the rotational symmetry in the joint geometry and loading as half of the single lap joint may be rotated by 180˚ about a point in 2D space to obtain the complete geometry and loading, as shown in Figure 2 An elastic material model was used for the aluminium adherends as no plastic deformation was observed during experimental testing of the joint [46]. The mechanical properties of Al2024 T3 are given in Table 1.…”

Section: Development Of Finite Element Modelmentioning

confidence: 99%

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Modelling Damage and Failure in Adhesive Joints Using A Combined XFEM-Cohesive Element Methodology

Mubashar

Ashcroft

Crocombe

2014

The Journal of Adhesion

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In recent years, cohesive elements based on the cohesive zone model (CZM) have been increasingly used within finite element analyses of adhesively bonded joints to predict failure. The cohesive element approach has advantages over fracture mechanics methods in that an initial crack doesn't have to be incorporated within the model. It is also capable of modelling crack propagation and representing material damage in a process zone ahead of the crack tip. However, the cohesive element approach requires the placement of special elements along the crack path and is, hence, less suited to situations where the exact crack path is not known a priori. The extended finite element method (XFEM) can be used to represent cracking within a finite element and hence removes the requirement to define crack paths or have an initial crack in the structure. In this paper a hybrid XFEM-cohesive element approach is used to model cracking in the fillet area using XFEM where the crack path is not known and then using cohesive elements to model crack and damage progression along the interface. The approach is applied to the case of an aluminium-epoxy single lap joint and is shown to be highly effective.

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Section: Development Of Finite Element Modelmentioning

confidence: 99%

Section: Development Of Finite Element Modelmentioning

confidence: 99%

Modelling Damage and Failure in Adhesive Joints Using A Combined XFEM-Cohesive Element Methodology

Mubashar

Ashcroft

Crocombe

2014

The Journal of Adhesion

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“…The joints dried after conditioning will hereafter be referred to as "dried joints". Further details of the results from the single lap joint tests can be found in [29].…”

Section: Materials Characterisationmentioning

confidence: 99%

A Method of Predicting the Stresses in Adhesive Joints after Cyclic Moisture Conditioning

Mubashar

Ashcroft

Critchlow

et al. 2011

The Journal of Adhesion

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The durability of adhesive joints is of special concern in structural applications and moisture has been identified as one of the major factors affecting joint durability. This is especially important in applications where joints are exposed to varying environmental conditions throughout their life. This paper presents a methodology to predict the stresses in adhesive joints under cyclic moisture conditioning. The single lap joints were manufactured from aluminium alloy 2024 T3 and the FM73-BR127 adhesive-primer system. Experimental determination of the mechanical properties of the adhesive was carried out to measure the effect of moisture uptake on the strength of the adhesive. The experimental results revealed that the tensile strength of the adhesive decreased with increasing moisture content. The failure strength of the single lap joints also progressively degraded with time when conditioned at 50°C, immersed in water, however, most of the joint strength recovered after drying the joints. A novel finite element based methodology, which incorporated moisture history effects, was adopted to determine the stresses in the single lap joints after curing, conditioning and tensile testing. A significant amount of thermal residual stress was present in the adhesive layer after curing the joints, however, hygroscopic expansion after the absorption of moisture provided some relief from the curing stresses. The finite element * Corresponding author. Tel: +44 1509 227535; fax: +44 1509 223934 Email address: i.a.ashcroft@lboro.ac.uk (I.A.Ashcroft) 2 model used moisture history dependent mechanical properties to predict the stresses after application of tensile load on the joints. The maximum stresses were observed in the fillet areas in both the conditioned and the dried joints. Study of the stresses revealed that degradation in the strength of the adhesive was the major contributor in the strength loss of the adhesive joints and adhesive strength recovery also resulted in recovered joint strength.The presented methodology is generic in nature and may be used for various joint configurations as well as for other polymers and polymer matrix composites.

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“…[17] Water then decreases the mechanical properties of adhesive (tensile strength and Young's modulus) [4][5][6][7][8][9], may (depending on surface treatment) cause corrosion in the substrate at the interface [18][19][20], and hydration of strong metal oxides [21,22]. The consequences of the diffused water in the adhesive joint are reductions in the joint strength, both static [23][24][25][26][27][28] and fatigue [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

The static and fatigue responses of aged metal laminate doublers joints under tension loading

Sugiman

Crocombe

2015

Journal of Adhesion Science and Technology

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Experimental studies have been undertaken to investigate the static and fatigue response of metal laminate doublers (MLD) joints under tension loading after ageing in deionised water at a temperature of 50 o C up to 2 years. It was found that absorbed water did not have a significant effect on the static and fatigue degradation of the MLD; however corrosion pits located on the aluminium surfaces caused a reduction in fatigue life.Inevitably the laminate contained butts where co-planar aluminium sheets were joined, and it was found that the position of the butt affected the static response of the MLD but, due to a restricted dataset, it has not been possible to assess the effect under fatigue loading. The backface strain technique in conjunction with video microscopy has been utilised to monitor the damage of the adhesive bondlines, the butts and the aluminium layers and successfully identified both the localised and the global damage in the MLD.Most of fatigue failures initiated at the stringer bondline edge and at the aluminium layers where the butt was located. A careful design should be made to reduce the stress concentration at the stringer edge and to avoid positioning the butts at the upper layer of aluminium close to the stringer edge.

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Moisture absorption–desorption effects in adhesive joints

Cited by 161 publications

References 32 publications

Modelling Damage and Failure in Adhesive Joints Using A Combined XFEM-Cohesive Element Methodology

Modelling Damage and Failure in Adhesive Joints Using A Combined XFEM-Cohesive Element Methodology

A Method of Predicting the Stresses in Adhesive Joints after Cyclic Moisture Conditioning

The static and fatigue responses of aged metal laminate doublers joints under tension loading

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