A shear-lag model for functionally graded adhesive anchors

Kumar, S.; Khan, M.A.

doi:10.1016/j.ijadhadh.2016.04.010

Cited by 28 publications

(12 citation statements)

References 21 publications

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“…Smooth variation in modulus was used to show the modifications of the stress field. In reference [23] a shear lag model was proposed for the modelling of functionally graded adhesive anchors. The shear strain and stress were assumed to be proportionally related to the axial deformation of the embedded anchor.…”

Section: Founding Theoretical Basis and Further Developmentsmentioning

confidence: 99%

Functionally graded adhesive joints – A review and prospects

Durodola

2017

International Journal of Adhesion and Adhesives

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There is increasing demand for effective and efficient lightweight structures because of global environmental and resource sustainability concerns. Adhesive bonding has been adopted in many assembly arrangements because of its relative reduction of stress concentration in joints compared to mechanical fasteners. Functionally graded bonded joints presents even greater potentials for reduction of stress concentrations and the tailoring of stress distribution as may be desired in an adhesive layer. This capability provides opportunity for the design of high performance tailored structural assemblies. Although some encouraging analysis and experimental work have been carried out on the development of functionally graded joints, its wide application is still to be realised. This paper reviews the work that has been carried out so far on the method, in terms of analysis, fabrication, experimental testing and application. It also reflects on outstanding issues that need to be resolved in order for wider application to be feasible.

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Section: Founding Theoretical Basis and Further Developmentsmentioning

confidence: 99%

Functionally graded adhesive joints – A review and prospects

Durodola

2017

International Journal of Adhesion and Adhesives

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“…Adhesive joints ensure the load transfer from one adherent to another, essentially by shear stress. Nevertheless, the stress distribution along the bond joint is not usually uniform, and exhibit localized concentration in specific areas, which reduces the bond resistance and leads in the majority of cases to its failure [5]. Several studies have been conducted and refined for more than seven decades in order to analyze the axial, shear and peel stress distribution along the bond joint.…”

Section: Introductionmentioning

confidence: 99%

“…Other studies showed that the mechanical performance of an adhesive joint could be improved by properly varying the mechanical properties of the adhesive over the bond length. Indeed, the variation of the adhesive shear modulus over the bond leads to reduce the stress concentration at the ends of the joint [5]. The use of several adhesives in the same bond joint is one of the widely used techniques to improve the bond stiffness and shear modulus.…”

Section: Introductionmentioning

confidence: 99%

A nonlinear shear-lag model applied to chemical anchors subjected to a temperature distribution

Lahouar

Pinoteau

Caron

et al. 2018

International Journal of Adhesion and Adhesives

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Adhesive joints are increasingly used in bridges and buildings construction thanks to their high mechanical properties and their ease of implementation. However, the load transfer mechanism within adhesive joints is complex and has been the subject of several studies since 1938. Several models have been developed to quantify the stress distribution along bond joints. Nevertheless, very few models exist today to study the stress distribution in chemical anchors by taking into account the temperature effect. This paper presents a non-linear shear-lag model adapted to chemical anchors allowing predicting their stress distribution profiles and fire resistance duration for any temperature distribution. The model highlights the importance of the temperature distribution on the stress profile. The paper shows that when the anchor reaches its maximum axial force, all the elements composing the anchor provide their maximum performance at the same time.

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“…The focus of many researchers has shifted more recently to the optimal selection of materials for example through the use of functionally graded adhesives [19] and optimal selection of joint geometry [20] to minimise the stress singularity, and also to accurate prediction of onset of fracture in each of these cases [13].…”

Section: Introductionmentioning

confidence: 99%

“…These include a shearlag based approach, where failure is assumed to occur at a critical shear strain in the adhesive [5,19]; the maximum principal stress criterion [6]; the average normal stress criterion, where failure is assumed to occur when the average stress equals a material dependent critical stress [21,22]; the strain energy density criterion [23], coupled strength and energy methods [24] and the stress intensity factor approach, e.g. [11,12,16].…”

Section: Introductionmentioning

confidence: 99%

Fracture initiation in bi-material joints subject to combined tension and shear loading

Akisanya

2017

Journal of Adhesion Science and Technology

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Linear elastic solution of the stress field near an interface corner of bi-material joints is of the form Hr -1 , where r is the radial distance from the corner, H is the stress intensity factor and 1 is the order of the singularity. Finite element analysis is used to determine the magnitude of H for a butt joint subject to remote shear; the obtained solution complements existing solution for remote tension and uniform change in temperature. The theoretical solution of the singular shear stress is shown to be in good agreement with the corresponding finite element solution. The effect of combined remote tension, remote shear and uniform change in temperature on the failure loads and failure mechanisms is experimentally determined for brass/araldite/brass butt joint. It is shown that the failure envelope in tensile stress -shear stress space is elliptical and the failure loads decrease with increasing cure temperature due to thermal residual stress associated with the curing process. The application of the results to the assessment of onset of failure in composite patch repair is discussed.

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A shear-lag model for functionally graded adhesive anchors

Cited by 28 publications

References 21 publications

Functionally graded adhesive joints – A review and prospects

Functionally graded adhesive joints – A review and prospects

A nonlinear shear-lag model applied to chemical anchors subjected to a temperature distribution

Fracture initiation in bi-material joints subject to combined tension and shear loading

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