Mechanical characteristics of some cold-cured structural adhesives

Lees, David E. B.; Hutchinson, A. R.

doi:10.1016/0143-7496(92)90054-y

Cited by 21 publications

(12 citation statements)

References 2 publications

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“…For Scotch Weld 9323 B/A the stiffness is reduced by 5% and 0.8% when the displacement rate is reduced from 6 to 1 mm/min and from 1 to 0.2 mm/min, respectively. Compared to the literature this decrease of stiffness is negligibly small (Dias et al, 2014;Lees & Hutchinson, 1992;Yu, Crocombe & Richardson, 2001). This is also visible on the stress-strain curves: the slopes of the curves are almost all the same (Fig.…”

Section: Discussion Of the Resultsmentioning

confidence: 47%

A preliminary study of the nonlinearity of adhesive point-fixings in structural glass facades

Dispersyn

Santarsiero

Belis

et al. 2014

Journal of Facade Design and Engineering

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The recent demand for architectural transparency has drastically increased the use of glass material for structural purpose. However, connections between structural glass members represent one of the most critical aspects of glass engineering, due to the fragile behaviour of this material. In that respect, research activities on adhesive point-fixings are currently on-going. The mechanical behaviour of adhesive point-fixings is affected by large nonlinearities, which are usually investigated by nonlinear Finite Element Analysis (FEA). This paper focuses on the geometrical and the material nonlinearities of adhesive point-fixings for glass structures.Firstly, the nonlinear material behaviour of two selected adhesives are investigated by means of uniaxial tension and compression tests on the bulk material. The production of specimens, test methodology and displacement rate dependency are discussed. Secondly, the nonlinear stress distribution occurring in the adhesive and the joint stiffness is investigated by means of nonlinear FEA. The effects of several parameters on the mechanical behaviour of adhesive point-fixings, such as the connection dimensions and adhesive elastic properties, are studied.The adhesive stress-strain curves resulting from the experimental campaign show that the adhesives exhibit a large nonlinear behaviour. The results show that the stress and strain at failure reduce as the displacement rate is reduced. From the numerical investigations it is concluded that large nonlinearity involves the mechanical behaviour of adhesive point-fixing which cannot be neglected. The stress distribution within the adhesive deviates from uniform nominal stresses, even in case of simple load condition, with stress peaks up to four times higher than nominal stresses. List of notationα σ, max [-] ratio between the maximum principal stress and the nominal stress α σ, mis [-] ratio between the Von Mises stress and the nominal stress σ nom [MPa] nominal stress 86 J. Dispersyn et al. / A preliminary study of the nonlinearity of adhesive point-fixings in structural glass facades σ max [MPa] maximum principal stress σ mis [MPa] Von Mises stress η [-] stress triaxiality p [MPa] hydrostatic pressure σ [MPa] stress tensor σ [MPa] deviatoric part of the stress tensor E [MPa] Young's modulus of elasticity of the adhesive v [-] Poisson's ratio of the adhesive D [mm] diameter of the metal connector t [mm] adhesive's thickness ε zz [-] longitudinal strain ε yy [-] transversal strain ε peak [-] maximal strain ε peak [MPa] maximal stress ε fail [-] strain at failure σ fail [MPa] stress at failure

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Section: Discussion Of the Resultsmentioning

confidence: 47%

A preliminary study of the nonlinearity of adhesive point-fixings in structural glass facades

Dispersyn

Santarsiero

Belis

et al. 2014

Journal of Facade Design and Engineering

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“…Bulk adhesive behavior becomes more important with thickness [311,312] and in such cases fatigue data on bulk adhesives might be more reliable than those from joints. [13] Nevertheless, it seems that for thin bondlines, experiments for joint and bulk adhesive provide similar adhesive properties if appropriately designed and executed.…”

Section: Potential and Challengesmentioning

confidence: 99%

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Budzik

Wolfahrt

Reis

et al. 2021

The Journal of Adhesion

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The development of new adhesives has allowed to expand the application of bonding into the most diverse industrial fields. This review article presents the commonly used experimental methods for the investigation of mechanical performance of adhesively bonded joints in the aerospace, wind energy, automotive and civil engineering sectors. In these sectors, due to their excellent intrinsic properties, composite materials are often used along with conventional materials such as steel, concrete and aluminium. In this context, and due to the limitations that the traditional joining techniques present, adhesive joints are an excellent alternative. However, standardized experimental procedures are not always applicable for testing representative adhesive joints in these industries. Lack of relevant regulations across the different fields is often overcome by the academia and companies' own regulations and standards. Additional costs are thus mitigated to the industrial sectors in relation with the certification process which effectively can deprive even the biggest companies from promoting adhesive bonding. To ensure continuous growth of the adhesive bonding field the new international standards, focusing on actual adhesive joints' performance rather than on specific application of adhesive joints are necessary.

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“…As alternative approaches for the determination of the elastic adhesive properties, tests on bulk adhesive specimens [1,12] or the enhanced resonant bar technique proposed in [13] can be cited.…”

Section: Introductionmentioning

confidence: 99%

“…1(a)) is a commonly used test method for the experimental determination of various material properties under shear load, namely, static and dynamic shear modulus [1,2], shear strength, and elongation at failure [3,4]. Reliable evaluation of the shear strains requires not only the consideration of the adhesive deformation but also the consideration of the substrate contribution if the strains are measured by extensometers at some distance from the adhesive layer.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Numerical Study of the Stress States in Flat and Cylindrical Lap Joints

Hosseini

Öchsner

2009

Journal of Adhesion Science and Technology

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The stress states along the bondline in flat and cylindrical lap joints are analysed with the finite element method. The cross section of both specimen configurations is the same and is modelled with the same twodimensional finite element mesh. The simulations are performed for the plane strain and axisymmetric cases which correspond to the flat and cylindrical specimens, respectively. The elastic properties of the adhesive are varied in a wide range and the influence on the stress distribution is analysed and compared for the two configurations. The most uniform stress state is obtained for the cylindrical specimen with the smallest diameter and the derived diagrams can be used for error prediction if average stress values are used for the estimation of elastic properties or failure loads.

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Mechanical characteristics of some cold-cured structural adhesives

Cited by 21 publications

References 2 publications

A preliminary study of the nonlinearity of adhesive point-fixings in structural glass facades

A preliminary study of the nonlinearity of adhesive point-fixings in structural glass facades

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

A Comparative Numerical Study of the Stress States in Flat and Cylindrical Lap Joints

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