Simulation of mechanical behaviour of composite bonded joints containing strip defects

Moura, M.F.S.F. de; Daniaud, R.; Magalhães, A.G.

doi:10.1016/j.ijadhadh.2005.06.010

Cited by 83 publications

(39 citation statements)

References 19 publications

(23 reference statements)

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“…A three parameter cohesive zone model was used to predict failure at the interface and in the composite. Cohesive elements based on cohesive zone models have also been used to investigate the effect of defects on the mechanical behaviour of single lap joints [42]. A two dimensional cohesive element with mixed-mode damage model was employed to predict the failure load of the single lap joints and it was concluded that the maximum load of a joint is decreased only by decrease in bonded surface.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…2. The different mechanical properties of the adhesive are given in Table 3 and taken directly from the literature, see de Moura et al (2006). This adhesive is used also in the aerospace industry given its important mechanical characteristics.…”

Section: Description Of Model Geometry and Materials Propertiesmentioning

confidence: 99%

Effects of the composite stacking sequence on the failure load of the single lap bonded joint

Mokhtari

Madani²,

Benzaama

et al. 2017

jtam

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Composite materials are widely used in aircraft structures, their relative rigidity/weight confers their advantage over metal structures, and the stacking sequence plays an important role for their use. The objective of this work is to analyze by the finite element method the mechanical behavior of a single lap joint of composite/composite type under a tensile load. In order to see the effects on the failure load, two basic parameters are taken into consideration; the stacking sequence of composite and thickness of each layer constituting the composite. Calculation of the failure load is made numerically with the ABAQUS code using the developed technique of VCCT (Virtual Crack Closure Technique) based on fracture mechanics. Finally, the influence of the bonding defect on the failure load is analyzed. The results clearly show the importance of optimizing fiber orientation and hence the stacking sequence for proper use of composite in bonded assemblies.

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“…However, one of the limitations for adhesively bonded joins is the difficulty in predicting joint strength after manufacture and during in-service operation due to the presence of defects in the adhesive [9]. The defects generated by inadequate preparation of the joints or environmental degradation (e.g., moisture effects) of the adhesive [9] would reduce the bonding quality and influence the joint strength accordingly [10].…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that defect in the adhesive layer had definite effect on the shear distribution and on the fracture strength of the joint. de Moura et al [9] simulated the composite bonded joints with strip defects. The interface elements considering mixed-mode damage were introduced to calculate the stresses and damage initiation and growth in the adhesive.…”

Section: Introductionmentioning

confidence: 99%

Strength analysis of metallic bonded joints containing defects

Wei

2012

Computational Materials Science

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a b s t r a c tFinite element simulation has been utilized to study the overall strength of metallic single lap joints with defects in their adhesive layers. Three types of defects are taken into account respectively, which are local debonding, weak bonding and void. For the first two types of defects, a developed numerical method using the cohesive zone model modified by user-defined subroutines is carried out as to consider the influences of the defect size and location. Furthermore, a modified-Gurson model is employed to simulate the adhesive layer with voids, considering the influence of the void size. The results show that the overall strength of the joints diminishes as the defect size is increased. Especially, the adhesive fracture properties and the size of the weak bonding region have combined influences on the strength of the joints.Crown

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Simulation of mechanical behaviour of composite bonded joints containing strip defects

Cited by 83 publications

References 19 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

Effects of the composite stacking sequence on the failure load of the single lap bonded joint

Strength analysis of metallic bonded joints containing defects

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