Modelling Fatigue in Adhesively Bonded Joints

Ashcroft, Ian; Crocombe, A.D.

doi:10.1007/978-3-540-79056-3_7

Cited by 10 publications

(6 citation statements)

References 59 publications

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“…The use of adhesive bonding in aircraft structures is continuously increasing both for assembling structural parts and for applying composite patch repairs due to the numerous advantages it provides over conventional joining techniques [1][2][3][4][5][6][7] such as the more uniform stress distribution in the joint, the ability to join dissimilar materials, the better fatigue properties, and the attractive strength-to-weight ratio. However, the use of adhesive bonding technology is limited to joining and patch repairing of structures that are not load critical.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effect of pre‐bond contamination with de‐icing fluid and ageing on the fracture toughness of composite bonded joints

Moutsompegka

Τσερπές

Polydoropoulou

et al. 2017

Fatigue Fract Eng Mat Struct

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The scope of the present work is to experimentally investigate the effect of pre‐bond contamination with de‐icing (DI) fluid and the combined effect of DI fluid and hygrothermal ageing on the fracture toughness of carbon fibre reinforced plastic bonded joints. These scenarios could occur in the implementation of an adhesively bonded patch repair in a composite aircraft structural part. To this end, mode I and mode II fracture toughness tests were conducted on contaminated specimens and mode II fracture toughness tests on contaminated/aged specimens. Three levels of contamination with a de‐icer were considered. The hygrothermal ageing conditions applied until saturation are 70°C/85% relative humidity. The experimental results reveal a detrimental effect of DI fluid on both mode I and mode II fracture toughness of the bonded joints. With increasing the contamination level, the mode I and mode II critical energy release rates decrease. Under mode I loading, the specimens failed mainly in light‐fibre‐tear mode, while under mode II loading, in adhesive failure mode. Hygrothermal ageing decreased further the mode II fracture toughness of the specimens and increased the adhesive failure mode. The present study reveals that the pre‐bond DI contamination and after‐bond ageing could critically degrade the strength of adhesively bonded patch repairs.

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Section: Introductionmentioning

confidence: 99%

Experimental study of the effect of pre‐bond contamination with de‐icing fluid and ageing on the fracture toughness of composite bonded joints

Moutsompegka

Τσερπές

Polydoropoulou

et al. 2017

Fatigue Fract Eng Mat Struct

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“…However, certain disadvantages are also associated with adhesive bonding, such as; limited operating range, environmental sensitivity and difficulty of disassembly. In structural applications, fatigue is generally considered to be the most important form of loading in respect to long-term service life and, hence, the effect of fatigue on structural adhesive joints has been extensively studied [1][2][3][4][5][6][7][8][9][10]. Most of this work has involved constant amplitude sinusoidal fatigue.…”

Section: Introductionmentioning

confidence: 99%

Fracture mechanics and damage mechanics based fatigue lifetime prediction of adhesively bonded joints subjected to variable amplitude fatigue

Shenoy

Ashcroft

Critchlow

et al. 2010

Engineering Fracture Mechanics

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The first part of the paper describes an investigation into the behaviour of adhesively bonded single lap joints (SLJs) subjected to various types of variable amplitude fatigue (VAF) loading. It was seen that a small proportion of fatigue cycles at higher fatigue loads could result in a significant reduction in the fatigue life. Pamgren-Miner's damage sum tended to be less than 1, indicating damage accelerative loadd interaction effects. In the second part of the paper, fracture mechanics (FM) and damage mechanics (DM) approaches are used to predict the fatigue lifetime for these joints. Two FM based approaches were investigated, which differed with respect to the cycle counting procedure, however, both approaches were found to under-predict the fatigue lifetime for all the types of spectra used. This was attributed to the inability of the FM based models to simulate the crack initiation phase. A DM based approach was then used with a power law relationship between equivalent plastic strain and the damage rate. Good predictions were found for most of the spectra, with a tendency to over-predict the fatigue life. AbstractThe first part of the paper describes an investigation into the behaviour of adhesively bonded single lap

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“…proposed [1]; however, to date the various approaches have been limited in their functionality and applicability.…”

Section: Introductionmentioning

confidence: 99%

“…Several reviews have been published [2][3] regarding usage of these models for metals and for composite materials and more recently for bonded joints [1]. It can be concluded from these reviews that while total life based approaches are the simplest to apply; they have limited scope in the lifetime prediction of bonded joints, especially in the case of variable amplitude fatigue.…”

Section: Introductionmentioning

confidence: 99%

Unified methodology for the prediction of the fatigue behaviour of adhesively bonded joints

Shenoy

Ashcroft

Critchlow

et al. 2010

International Journal of Fatigue

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A unified model is proposed to predict the fatigue behaviour of adhesively bonded joints. The model is based on a damage mechanics approach, wherein the evolution of fatigue damage in the adhesive is defined as a power law function of the micro-plastic strain. The model is implemented as an external subroutine for commercial finite element analysis software. Three dimensional damage evolution and crack propagation were simulated using this method and an element deletion technique was employed to represent crack propagation. The model was able to predict the damage evolution, crack initiation and propagation lives, strength and stiffness degradation and the backface strain during fatigue loading. Hence the model is able to unify previous approaches based on total life, strength or stiffness wearout, backface strain monitoring and crack initiation and propagation modelling. A comparison was made with experimental results for an epoxy bonded aluminium single lap joint and a good match was found.

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Modelling Fatigue in Adhesively Bonded Joints

Cited by 10 publications

References 59 publications

Experimental study of the effect of pre‐bond contamination with de‐icing fluid and ageing on the fracture toughness of composite bonded joints

Experimental study of the effect of pre‐bond contamination with de‐icing fluid and ageing on the fracture toughness of composite bonded joints

Fracture mechanics and damage mechanics based fatigue lifetime prediction of adhesively bonded joints subjected to variable amplitude fatigue

Unified methodology for the prediction of the fatigue behaviour of adhesively bonded joints

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