Numerical analysis of fracture mechanisms and failure modes in bi-layered structural components

Carpinteri, Alberto; Paggi, Marco

doi:10.1016/j.finel.2007.06.003

Cited by 14 publications

(11 citation statements)

References 39 publications

(45 reference statements)

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“…In fact, from a theoretical point of view, the problem of residual stresses induced by a hot bonding of n material components during the fabrication process can be considered equivalent, neglecting the algebraic sign, to the problem of thermal stresses induced by a temperature increase in an already bonded multi-layered structure [30]. As a consequence, the problem of residual stresses induced in the elements by a temperature increase T can be studied as a problem of thermal stresses due to a temperature decrease of the same amount.…”

Section: Resultsmentioning

confidence: 99%

Thermo-elastic mismatch in nonhomogeneous beams

Carpinteri

Paggi

2008

J Eng Math

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The problem of thermo-elastic stress analysis in multi-layered nonhomogeneous beams is considered. The proposed analytical approach based on the multi-layered beam theory permits to take into account an arbitrary distribution of the Young's modulus, of the thermal-expansion coefficient, and of the temperature variation along the beam depth. The effect of shear deformability of the interfaces is also carefully analyzed. Useful closed-form solutions for the normal stresses in the layers and for the interface tangential stresses are provided in the case of nonhomogeneous bi-and tri-layered beams. The obtained results show the effectiveness of using functionally graded materials to relieve stress-concentrations due to the thermo-elastic mismatch typical of laminated beams with homogeneous layers.

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Section: Resultsmentioning

confidence: 99%

Thermo-elastic mismatch in nonhomogeneous beams

Carpinteri

Paggi

2008

J Eng Math

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“…This is for instance the case of the bit of a cutting tool, where the external layer is usually made of polycrystalline diamond (PCD) and the substrate is hardmetal. This composite structure is then joined to a steel support (for more details about geometry and material properties, please refer to [10,11]). When subjected to repeated loadings, as during cutting operations, different failure modes (micro-, meso-and macro-chipping) may occur, depending on the initiation point of a crack on the vertical side in tension.…”

Section: Fracture Mechanics Of Hierarchical Cellular Materialsmentioning

confidence: 99%

“…2. Figure 2: Sketch of a PCD bit used in cutting tools [10]. The critical impact load is denoted by Pc and different possible failure modes ranging from micro-to macro-chipping are sketched.…”

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Structural integrity of hierarchical composites

Paggi¹

2011

Frattura Ed Integrità Strutturale

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ABSTRACT. Interface mechanical problems are of paramount importance in engineering and materials science. Traditionally, due to the complexity of modelling their mechanical behaviour, interfaces are often treated as defects and their features are not explored. In this study, a different approach is illustrated, where the interfaces play an active role in the design of innovative hierarchical composites and are fundamental for their structural integrity. Numerical examples regarding cutting tools made of hierarchical cellular polycrystalline materials are proposed, showing that tailoring of interface properties at the different scales is the way to achieve superior mechanical responses that cannot be obtained using standard materials

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“…The WC-Co cell boundary deflects and interrupts crack propagation and reduces the size of each individual chipped part. As a result, the macro-chipping failure mode, which involves a significant amount of material for a homogeneous PCD [4], is reduced or prevented. Hence, the reduction of the size of the chipped portions allows us to enhance the functionality of the component and to increase its service life.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation in Honeycomb Cellular Materials: A Computational Approach

Paggi

2012

Metals

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Abstract:Computational models based on the finite element method and linear or nonlinear fracture mechanics are herein proposed to study the mechanical response of functionally designed cellular components. It is demonstrated that, via a suitable tailoring of the properties of interfaces present in the meso-and micro-structures, the tensile strength can be substantially increased as compared to that of a standard polycrystalline material. Moreover, numerical examples regarding the structural response of these components when subjected to loading conditions typical of cutting operations are provided. As a general trend, the occurrence of tortuous crack paths is highly favorable: stable crack propagation can be achieved in case of critical crack growth, whereas an increased fatigue life can be obtained for a sub-critical crack propagation.Keywords: honeycomb cellular materials; finite element method; linear and nonlinear fracture mechanics

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Numerical analysis of fracture mechanisms and failure modes in bi-layered structural components

Cited by 14 publications

References 39 publications

Thermo-elastic mismatch in nonhomogeneous beams

Thermo-elastic mismatch in nonhomogeneous beams

Structural integrity of hierarchical composites

Crack Propagation in Honeycomb Cellular Materials: A Computational Approach

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