The Mechanics of the Wedge Test

Cognard, J.

doi:10.1080/00218468608073236

Cited by 69 publications

(25 citation statements)

References 10 publications

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“…However, in the case of the wedge test, in which the adherend(s) is (are) initially forced to curve, it is the strain energy associated with this curvature which is the direct source of energy required to propagate fracture (Kanninen 1973;Cognard 1986;Sener et al 2002;Blackman et al 2003;Popineau et al 2004;Sargent 2005;Budzik et al 2009). In the latter case, two rectangular sheets of material are bonded together and a 'wedge' inserted at one end of the structure, in order to force apart the two adherends over a short initial distance.…”

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Pre-cracking behaviour in the single cantilever beam adhesion test

2011

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The single cantilever beam adhesion test is a variant of the asymmetric wedge test in which a constant load is attached to the free adherend end to originate the moment required for joint fracture. It has the potential disadvantage of leading to an uncontrollable, accelerating crack, due to the constantly increasing applied couple, but presents the advantage of providing data on joint behaviour prior to crack initiation. It is this latter aspect that we consider in this paper. An apparently decreasing crack growth rate, as obtained from measurements of displacement of the free end of the beam is attributed to time-dependent adhesive strain. Use of classic, simple beam theory and Winkler, elastic foundation, equations allows us to assess an effectively static fracture energy, or fracture threshold.

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Pre-cracking behaviour in the single cantilever beam adhesion test

2011

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“…This process releases energy and stops when the energy release rate is equal to the fracture energy G 0 1) of the adhesive bond. Then [35] 1) The '' fracture energy,'' G, is the energy required to create one unit of surface of fracture. In the case of structural adhesives, it is equal to G = Nu ξ (Eq.…”

Section: The Mechanics Of the Wedge Testmentioning

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“…In the case of structural adhesives, it is equal to G = Nu ξ (Eq. 5.10) where is the density of anchorage, N the number of extended bonds, and u ξ the energy of a bond [35]. …”

Section: The Mechanics Of the Wedge Testmentioning

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Durability

Giannis¹,

Davies

Ameli

et al. 2012

Testing Adhesive Joints

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“…A less important role is played by the shape of the traction-separation curve (Williams and Hadavinia, 2002). Such input parameters are usually estimated according to conventional mechanical tests designed to evaluate the properties of the interface (Cognard, 1986(Cognard, , 1987Crosley and Ripling, 1991;RILEM, 1985). Among them, the debonding double cantilever beam geometry (DCB) is widely adopted for the evaluation of the Mode I fracture energy (see Fig.…”

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The effect of contact on the decohesion of laminated beams with multiple microcracks

Carpinteri

Paggi

Zavarise

2008

International Journal of Solids and Structures

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The problem of interface decohesion in laminated beams is addressed with reference to the debonding double cantilever beam test geometry (DCB). The paper deals with the analysis of the influence of nonuniform bonding properties or interfacial defects on the crack propagation process and its stability. To this aim, the classical analytical approach based on the Euler-Bernoulli beam on an elastic foundation is extended to the presence of a general distribution of microcracks ahead of the macrocrack tip. The main features and limitations of this approach are carefully analyzed. In particular, it is shown that this simplified approach does not consider the unilateral contact condition along the interface, thus admitting a penetration between the two arms of the beam. A comparison with a finite element formulation is proposed to assess if this violation of the constraints inequalities, usually adopted in the case of uniform bonding, is still acceptable when interfacial defects are present. In order to fully describe the whole nonlinear behavior of the interface, a generalized interface constitutive law is used. The models comparison shows that, in the presence of interfacial defects, the effect of contact plays a crucial role in the description of the mechanical response of the joint.

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The Mechanics of the Wedge Test

Cited by 69 publications

References 10 publications

Pre-cracking behaviour in the single cantilever beam adhesion test

Pre-cracking behaviour in the single cantilever beam adhesion test

Durability

The effect of contact on the decohesion of laminated beams with multiple microcracks

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