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Goldstein, R. V.; Perelmuter, Mikhail

doi:10.1023/a:1018382321949

Cited by 43 publications

(5 citation statements)

References 17 publications

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“…It will be assumed here that bonds deformation law is predefined. The general nonlinear form of this spring-like bonds deformation law can be written similar to [6,7] t r,z = k r,z (r, σ)(u (1) r,z − u…”

Section: Bridged Interfacial Crackmentioning

confidence: 99%

“…The computation of the crack opening, bridged stresses and the SIF module analysis is the first step in bridged cracks growth modeling. Analysis of bridged cracks growth can be implemented in the frame of the nonlocal criterion of bridged cracks growth [6] which can be easily incorporated into the developed boundary element code. The bridged crack model can be used also to model cracks self-healing assuming that the self-healing process is the result of the crack bridged zone formation [2].…”

Section: Closingmentioning

confidence: 99%

“…The problem of displacements and stresses analysis for bridged cracks in homogeneous infinite media was considered in [3,4] (planar problem) and in [5] (problem with axial symmetry). For bridged interfacial cracks between two semi-infinite plates the problems were solved in [6,7] by the singular integral-differential equation method (planar problem). In the last several decades a number of papers were devoted to the application of the boundary element method (BEM) to computation of the stress intensity factors (SIF) for cracks on bi-material interfaces in finite size structures, see, for example, [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Stress analysis of composites with interfacial bridged cracks and damaged zones

Perelmuter

2022

J. Phys.: Conf. Ser.

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Stress analysis of composite structures with bridged cracks and damaged zones is performed with the direct boundary integral equations method in axisymmetric formulation. It is assumed that: a) the crack faces interact in some zones behind of the cracks edges (bridged zones); b) these zones width can be comparable to the whole crack size; c) adjacent parts of the structure can be connected by mechanical ligaments (including interfaces ahead of cracks fronts) and the relative displacements of these parts can occur under the loading (these zones consider as damaged zones). The boundary element software to solve axisymmetric problems of elasticity with interfacial bridged cracks and damaged zones was developed. The results for different properties of composite materials and bonds are presented. Applications the bridged crack approach to modeling of cracks self-healing is remarked.

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Section: Bridged Interfacial Crackmentioning

confidence: 99%

Section: Closingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stress analysis of composites with interfacial bridged cracks and damaged zones

Perelmuter

2022

J. Phys.: Conf. Ser.

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“…In this study, the applicability of the ESBCs with the relations derived for spring stiffnesses [ 37 , 38 ] for simulating wave propagation in laminates with a locally damaged interface is investigated. Two kinds of local interfacial decohesion zones with an imperfect contact at the interfaces are considered: partially closed delaminations [ 42 , 43 , 44 , 45 ] and bridged cracks [ 46 , 47 , 48 , 49 ]. Accurate modelling of wave scattering by an interface finite size delamination crack within the framework of the linear theory of elasticity leads to the presence of fast oscillations in the stresses and displacements near crack tips [ 50 ].…”

Section: Introductionmentioning

confidence: 99%

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Golub

Doroshenko

2023

Materials

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Cohesive and adhesive bindings degrade during operation and maintenance even if contacting materials in a manufactured laminated structure are perfectly matched at the interfaces. Two modelling approaches for describing partially closed delaminations or imperfect contact zones, which often occurs at the interfaces, are examined and considered. To confirm the adequateness of the applicability of the effective spring boundary conditions for guided wave scattering by a finite length delamination, guided wave propagation through a damaged zone with a distribution of micro-cracks is compared with an equivalent cohesive zone model, where the spring stiffnesses for the effective boundary conditions are calculated using the properties of the considered crack distribution. Two kinds of local interfacial decohesion zones with an imperfect contact at the interfaces are considered: uniform partially closed delaminations and bridged cracks. The possibility of the employment of the effective spring boundary conditions to substitute a distribution of micro-cracks is analysed and discussed. Two algorithms of generation of a distribution of open micro-cracks providing characteristics equivalent to the effective boundary conditions are presented and examined. The influence of the characteristics of a delamination on wave characteristics (eigenfrequencies, eigenforms, transmission coefficient) is investigated for several kinds of partially closed delaminations.

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“…of micro-samples and thin films were surveyed for mechanical properties and fatigue investigations. Cyclic fatigue is the most commonly encountered mode of failure in structural materials, occurring in both ductile (metallic) and brittle (ceramic) solids [7]. Furthermore, many metal-containing micro devices and structures must function in the corrosive environment.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser direct fabrication of metallic microcantilevers for a micro-corrosion-fatigue test

Wang¹,

Lu²,

Dai³

et al. 2007

J. Micromech. Microeng.

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Femtosecond (fs) laser direct fabrication of a Ni microcantilever was investigated, and the laser processing parameters were optimized. The Ni microcantilevers of good quality with structure and dimensions according commendably with that of the designed cantilever were obtained. The result shows that fs laser micromachining is a promising method for directly fabricating metallic microcomponents. Using the fs laser fabricated Ni microcantilever, the cyclic fatigue test under corrosion was investigated. The testing results show that the effect of surface flaws and roughness play a greater role in degrading the resistance of the corrosion fatigue for metallic microcomponents than for ordinary sized components. The creep deformations of the micro-sized Ni specimens can easily occur at room temperature, and this implies that the micro-sized Ni specimens appear to have an improved resistance towards total crack as compared to ordinary-sized Ni specimens.

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Untitled

Cited by 43 publications

References 17 publications

Stress analysis of composites with interfacial bridged cracks and damaged zones

Stress analysis of composites with interfacial bridged cracks and damaged zones

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Femtosecond laser direct fabrication of metallic microcantilevers for a micro-corrosion-fatigue test

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