Modelling the environmental degradation of adhesively bonded aluminium and composite joints using a CZM approach

Liljedahl, C.D.M.; Crocombe, A.D.; Wahab, Magd Abdel; Ashcroft, IA

doi:10.1016/j.ijadhadh.2006.09.015

Cited by 122 publications

(60 citation statements)

References 21 publications

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“…The finite element approach provides a powerful tool for the application of durability prediction methods and has been used successfully in recent years [19,20]. Using the finite element based approach, a coupled stress-diffusion analysis was used to predict joint durability by Wahab et al [21].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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show abstract

“…A curve fitting procedure was carried out to determine these parameters based on the measured extensions from dry, pre-saturated and gradually saturated bulk specimens [31]. Good agreement was achieved comparing the experimental and numerical creep strain-time curves for the gradually saturated bulk adhesive as presented in Fig.…”

Section: Resultsmentioning

confidence: 96%

“…A power-law creep model was used in the subsequent simulation procedure as expressed in Eq. 2 [31]. ̇= (2) here, ε̇ represents the creep strain rate, q is the von Mises equivalent stress, t is the time and A, n and m are coefficients based on a fitting procedure to the experimental data.…”

Section: Bulk Adhesive Ageingmentioning

confidence: 99%

The strength prediction of adhesive single lap joints exposed to long term loading in a hostile environment

Han

Crocombe

Anwar

et al. 2014

International Journal of Adhesion and Adhesives

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“…This bilinear traction separation law has been successfully employed in damage modelling of adhesive joints [22][23][24][25] and in composite laminate delamination [26][27][28][29]. Table 5 shows the properties of cohesive zone model.…”

Section: Materials Data For Modellingmentioning

confidence: 99%

Investigating the static response of hybrid fibre–metal laminate doublers loaded in tension

Sugiman

Crocombe

Katnam

2011

Composites Part B: Engineering

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Modelling the environmental degradation of adhesively bonded aluminium and composite joints using a CZM approach

Cited by 122 publications

References 21 publications

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

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

The strength prediction of adhesive single lap joints exposed to long term loading in a hostile environment

Investigating the static response of hybrid fibre–metal laminate doublers loaded in tension

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