Intrinsic static strength of friction interfaces augmented with anaerobic adhesives

Dragoni, Eugenio; Mauri, P.

doi:10.1016/s0143-7496(99)00062-7

Cited by 51 publications

(37 citation statements)

References 6 publications

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“…The assemblies strength can be predicted by comparing the respective equivalent stresses or strains at the critical regions, obtained by stress or strain-based criteria, with the properties of the structure constituents. These criteria are highly mesh dependent, as stress singularities are present at the end of the overlapping regions due to the sharp corners [14][15][16]. As for fracture mechanics, using LinearElastic Fracture Mechanics (LEFM), an inherent flaw is required for the calculation of the stress intensity factors or strain energy.…”

Section: Introductionmentioning

confidence: 99%

Strength prediction of single- and double-lap joints by standard and extended finite element modelling

Campilho

Banea

Pinto³

et al. 2011

International Journal of Adhesion and Adhesives

309

121

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The structural integrity of multi-component structures is usually determined by the strength and durability of their unions. Adhesive bonding is often chosen over welding, riveting and bolting, due to the reduction of stress concentrations, reduced weight penalty and easy manufacturing, amongst other issues. In the past decades, the Finite Element Method (FEM) has been used for the simulation and strength prediction of bonded structures, by strength of materials or fracture mechanics-based criteria. Cohesive-zone models (CZMs) have already proved to be an effective tool in modelling damage growth, surpassing a few limitations of the aforementioned techniques. Despite this fact, they still suffer from the restriction of damage growth only at predefined growth paths. The eXtended Finite Element Method (XFEM) is a recent improvement of the FEM, developed to allow the growth of discontinuities within bulk solids along an arbitrary path, by enriching degrees of freedom with special displacement functions, thus overcoming the main restriction of CZMs. These two techniques were tested to simulate adhesively bonded single-and double-lap joints. The comparative evaluation of the two methods showed their capabilities and/or limitations for this specific purpose.

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Section: Introductionmentioning

confidence: 99%

Strength prediction of single- and double-lap joints by standard and extended finite element modelling

Campilho

Banea

Pinto³

et al. 2011

International Journal of Adhesion and Adhesives

309

121

View full text Add to dashboard Cite

show abstract

“…The friction coefficient A is considered constant, both in the presence and absence of adhesive, because metals remain in contact (without any adhesive interposition) in the peaks of the roughness, whereas the liquid adhesive fills the voids of all depressions [3]. The adhesive contribution F ad (N) depends on the coupling surface A and the mean adhesive static strength ad (MPa), which must be experimentally calculated.…”

Section: Methodsmentioning

confidence: 99%

How to improve static and fatigue strength in press-fitted joints using anaerobic adhesive

Croccolo

Agostinis

Vincenzi

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study is focused on the static and fatigue strength of interference-fitted connections supplemented with anaerobic adhesive (hybrid joints). Through axial release tests, it is demonstrated that the addition of the adhesive always improves the performance of the joint. The main achievable benefits can be summarized in (a) the possibility of increasing the load transfer capability with the same joint geometry and (b) reducing both the weight and the stress field of the joint with the same load transfer capability. The objective of the study is to provide some relevant information on the static and fatigue strength properties in case of both steelaluminium components (mixed hybrid joints) and steel-steel components (steel hybrid joints). Furthermore, the authors provide some design formulae useful to predict the releasing force (the strength of the joints) both under static and dynamic conditions. Relevant improvements can be obtained using the anaerobic adhesive in terms of releasing force, which increases at least of 40 per cent. The proposed results derive from a collection of 200 experimental tests performed by the authors on a high-strength, single-component adhesive, which cures anaerobically (LOCTITE 648 Õ ).

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“…The relationships reported in equation (3) have been obtained empirically from several tests performed on steel-steel assemblies. In order to evaluate the actual coupling pressure accurately, especially in presence of different coupled materials, it is advisable to apply a strain gage on the external surface of the hub, which is able to provide the external hoop strain ε θ , as reported in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The friction coefficient μ A is considered constant, both in presence and in absence of adhesive, because metals remain in contact (without any adhesive interposition) in the peaks of the roughness, whereas the liquid adhesive fills the voids of all depressions [3]. The adhesive contribution F ad (N) depends on the coupling surface A and the mean adhesive static strength τ ad (MPa), which must be accurately calculated.…”

Section: Methodsmentioning

confidence: 99%

“…As a matter of fact, dry press-fitted couplings achieve only 20-30% of nominal surface contact (metal to metal), whereas the adhesive presence is able to fill the voids (air), reaching 100% of contact area [1]. However, the strength of HJ must be evaluated accurately, since it is affected by various factors, such as the coupling pressure [2], the type and the way of assembling [3,4], the type of materials in contact [5,6], the surface roughness [7], the curing type and the curing methodology [8], the operating temperature [9] and the loading type [10]. Most of literature about HJs is mainly focused on steel-steel components (Steel Hybrid Joints -SHJs) [2-5, 11, 12] and on their verification technique (non-destructive testing) [13,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Analysis of Static and Fatigue Strength Properties in Press-Fitted and Adhesively Bonded Steel–Aluminium Components

Croccolo¹,

Agostinis²,

Vincenzi³

2011

Journal of Adhesion Science and Technology

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Intrinsic static strength of friction interfaces augmented with anaerobic adhesives

Cited by 51 publications

References 6 publications

Strength prediction of single- and double-lap joints by standard and extended finite element modelling

Strength prediction of single- and double-lap joints by standard and extended finite element modelling

How to improve static and fatigue strength in press-fitted joints using anaerobic adhesive

Experimental Analysis of Static and Fatigue Strength Properties in Press-Fitted and Adhesively Bonded Steel–Aluminium Components

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