Non-tubular bonded joint under torsion: Theory and numerical validation

Pugno, Nicola; Surace, G.

doi:10.12989/sem.2000.10.2.125

Cited by 8 publications

(21 citation statements)

References 27 publications

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“…Following [18][19][20][21][22], we find the identical result reported in Eq. (4b), if we assume an equivalent dissipated energy per unit surface 2γ given by:…”

Section: Theorysupporting

confidence: 85%

“…We treat the scheme reported in Fig. 1(a) according to elasticity and energy balance, following previous approaches [18][19][20][21][22][23]; in this paper we introduce friction (i) and we demonstrate that the sliding can be treated as a "delamination" but taking place at a reduced "equivalent surface energy" that is correlated to friction and adhesion (ii). Accordingly, following [18][19][20][21][22][23], the solution posed by elasticity for the maximum shear stress arising at the interface of the two layers (the stress peak will take place at the end of the element with the higher rigidity, thus is symmetric for our considered identical layers), having Young's modulus E 1,2 (E 1,2 = E for identical layers), crosssectional areas A 1,2 (A 1,2 = A = bh for identical layers) and contact length l = 2c, in the presence of friction becomes: …”

Section: Theorymentioning

confidence: 99%

“…Is friction dominated by the friction shear strength, by the friction force or by the dissipated energy? Coupling elasticity and energy balance [18][19][20][21][22][23][24][25][26][27] with molecular dynamics (MD) [27][28][29][30] and statistical simulations [31][32][33][34] we solve in this paper such controversy.…”

Section: Introductionmentioning

confidence: 99%

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A generalization of the Coulomb’s friction law: from graphene to macroscale

et al. 2013

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At the nanoscale, differently to what happens at the macroscale, friction even without an applied normal pressure and spontaneous adhesion take place. In particular, the nanotribology between two layers of graphene, or other two-dimensional nanomaterials (even curved, such as nanotube walls), remains controversial. It is sufficient to say that friction between two graphene layers or nanotube walls is described in the current literature giving as "material property" a constant friction force or a constant friction shear strength, even if such views are obviously mutually exclusive. Is friction dominated by a strength, by a force or by an energy? Coupling elasticity and energy balance we solve this paradox deriving a generalization of the celebrated Coulomb's friction law, reconciling the two current views. Molecular dynamics simulations on graphene are conducted to verify its validity at the nanoscale whereas statistical simulations confirm its validity even at the macroscale.

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“…Following [18][19][20][21][22], we find the identical result reported in Eq. (4b), if we assume an equivalent dissipated energy per unit surface 2γ given by:…”

Section: Theorysupporting

confidence: 85%

Section: Theorymentioning

confidence: 99%

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A generalization of the Coulomb’s friction law: from graphene to macroscale

et al. 2013

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“…On the other hand, the rotational equilibrium suggests that the axial loads are applied at the interface level (y = 0). Satisfying the load boundary conditions implies that the axial load must be equal to zero at the extreme faces (x = Çc, 2c being the length of the FGMS), as well as its first derivative must be equal to zero in the middle (x = 0) of the structure, due to the symmetry of the problem (Pugno and Surace, 2000;Pugno, 2001;Pugno and Carpinteri, 2003):…”

Section: Thermal Stresses In Fgmsmentioning

confidence: 99%

Thermal loading in multi-layered and/or functionally graded materials: Residual stress field, delamination, fatigue and related size effects

Carpinteri

Pugno

2006

International Journal of Solids and Structures

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The stress field and fracture propagation due to thermal loading in multi-layered and/or functionally graded composite materials are extensively analysed. Regarding fracture, we have focused the attention on delamination between the layers due to brittle or fatigue thermally induced crack propagations. The statically indeterminate stress analysis is solved coupling equilibrium, compatibility and constitutive equations. Fracture analysis is based on the classical GriffithÕs criterion rewritten for composite structures under thermal loading. As an example, a two-layer prismatic structure is considered, each layer being composed by a different functionally graded material. The solution is particularized for the case of a linear grading. The size and shape effects are discussed and an optimization procedure is proposed. A numerical application of the findings to hard metal and diamond based cutters concludes the paper.

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“…Science of adhesion is truly interdisciplinary, involving a great variety of different interrelated physical phenomena like friction, fracture, mechanics of contact, visco-plastic deformation and interfacial properties, such as debonding and rupture of adhesive bonds. [1][2][3] Detailed mechanisms of such a complicated mixture of phenomena are not yet well understood.…”

mentioning

confidence: 99%

Peeling Experiments of Double Side Adhesive Tapes Suggests the Feasibility of Graphene Nanocomposites with Gigantic Toughness

Pugno¹,

Abdalrahman²

2012

Nanosci Nanotechnol Lett

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Using a MTS micro-tensile testing machine equipped with a video camera, we studied the peeling dynamics of double sided adhesive tapes under imposed displacement. A standard T -peel test was considered for the tape system in order to assess its toughness and strength. The strength necessary to separate the folds and the total energy required to detach them were thus measured. The effects of the fold length and width both on the strength and energy adsorption were also evaluated, suggesting new strategies for the design of super-tough bio-inspired materials, mainly the need of a nanoscopic thickness thus suggesting graphene as the ideal candidate to produce super-tough nanomaterials. Keywords:Since the inception of structural bonding, peel tests have been an integral part of the adhesive performance specifications, and have played an important role in the development of adhesives.The phenomenon of adhesion has attracted attention due to scientific challenges it poses as well as for their industrial importance. Science of adhesion is truly interdisciplinary, involving a great variety of different interrelated physical phenomena like friction, fracture, mechanics of contact, visco-plastic deformation and interfacial properties, such as debonding and rupture of adhesive bonds.

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Non-tubular bonded joint under torsion: Theory and numerical validation

Cited by 8 publications

References 27 publications

A generalization of the Coulomb’s friction law: from graphene to macroscale

A generalization of the Coulomb’s friction law: from graphene to macroscale

Thermal loading in multi-layered and/or functionally graded materials: Residual stress field, delamination, fatigue and related size effects

Peeling Experiments of Double Side Adhesive Tapes Suggests the Feasibility of Graphene Nanocomposites with Gigantic Toughness

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