The fracture energy of bimaterial interfaces

Evans, A.G.; Rühle, M.; Dalgleish, B.J.; Charalambides, Panos G.

doi:10.1007/bf02646986

Cited by 242 publications

(55 citation statements)

References 29 publications

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“…While initiation of a bottom face crack occurs under almost pure mode I conditions, the large shear stress level at the interface (mean value higher than 70 MPa with a peak at 120 MPa located at 4.3 mm from the lower free surface) suggests that its propagation should occur in an increasingly mode II manner. This raises the likelihood of crack arrest because of the greater crack growth resistance of the interface as the phase angle characterizing the modal mixity increases [16][17][18]. Moreover, propagation of the crack towards the top face also drives it into an increasingly compressive radial stress field, which suggests that blunting of crack propagation occurs.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Mechanical testing of titanium/aluminium–silicon interfaces by push-out

et al. 2008

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Abstract:Mechanical properties of Ti/Al-7Si assemblies produced by insert moulding have been studied with a classical push-out test and a variant that is the circular bending test. Special care has been taken for controlling both the reactivity at theTi/Al-7Si interface and the metallurgical health of the Al-7Si matrix. Mechanical tests until complete debonding have been completed with interrupted tests, metallographic characterizations and FEM analysis of elastic stress state. A mean shear strength of the interface of about 120 MPa has been obtained. When the Ti insert is solely fretted in the matrix, without chemical interaction between Ti and the Al-7Si alloy, the mean shear strength is significantly lower (48 MPa). This result clearly shows that chemical interaction at the interface (formation of a thin TiSi layer at the Ti side and a thick Al 3 Ti(Si) layer at the Al-7Si alloy side) improves the mechanical properties of the assembly. It is also shown that the failure sequence is characterized both by crack propagation from bottom to top and matrix yielding from top to bottom. Actually, interface damaging begins by crack initiation at the specimen bottom face (not at the top face, under the indenter) in a nearly pure mode I solicitation at a radial tensile stress of about 100 MPa.

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Section: Finite Element Modelingmentioning

confidence: 99%

Mechanical testing of titanium/aluminium–silicon interfaces by push-out

et al. 2008

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“…This is not difficult to understand if the similarity between fracture mechanics and contact mechanics is recalled (Maugis, 1992;Giannakopoulos et al, 1998) since it is well known in fracture mechanics that mode mixity will increase the interface fracture toughness. Following the ideas from fracture mechanics (Evans et al, 1990;Hutchinson and Suo, 1992), here we investigate the influence of mode mixity on adhesive contact of graded materials. Without loss of generality, we focus attention on plane strain adhesive contact.…”

Section: Effect Of Mode Mixity For Graded Materialsmentioning

confidence: 99%

Mechanics of non-slipping adhesive contact on a power-law graded elastic half-space

Gao

Jin

Gao

2011

International Journal of Solids and Structures

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a b s t r a c tIn previous work about axisymmetric adhesive contact on power-law graded elastic materials, the contact interface was often assumed to be frictionless, which is, however, not always the case in practical applications. In order to elucidate the effect of friction and the coupling between normal and tangential deformations, in the present paper, the problem of a rigid punch with a parabolic shape in non-slipping adhesive contact with a power-law graded half-space is studied analytically via singular integral equation method. A series of closed-form analytical solutions, which include the frictionless and homogeneous solutions as special cases, are obtained. Our results show that, compared with the frictionless case, the interfacial friction tends to reduce the contact area and the indentation depth during adhesion. The magnitude of the coupling effect depends on both the Poisson ratio and the gradient exponent of the half-space. This effect vanishes for homogeneous incompressible as well as for linearly graded materials but becomes significant for auxetic materials with negative Poisson's ratio. Furthermore, influence of mode mixity on the adhesive behavior of power-law graded materials, which was seldom touched in literature, is discussed in details.

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“…Funhermore, the variation in rj with mixity becomes more pronounced for rough fibers and in the presence of plasticity. 22 The above interface model has the appealing feature that it connects to independent studies of interface fracture and of frictional sliding.…”

Section: Interface Propertiesmentioning

confidence: 99%