A dynamic FEM simulation of the nano-impact test on mono- or multi-layered PVD coatings considering their graded strength properties determined by experimental–analytical procedures

Skordaris, G.; Bouzakis, K.‐D.; Charalampous, Paschalis

doi:10.1016/j.surfcoat.2015.01.063

Cited by 41 publications

(30 citation statements)

References 23 publications

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“…In the developed FEA-model, a surface-to-surface contact was applied for describing the interface between the nasal bone and the instrument. In addition, an eroding contact was applied between instrument and nasal bone material [21,22]. In this way, elements involved in the contact definition are subjected to erosion (element deletion) according to a material failure criterion and not directly due to the eroding contact restrictions.…”

Section: Analytical Resultsmentioning

confidence: 99%

A FEA-Based Methodology to Predict the Osteotome Wear Status during Nasal Bone Surgical Operations

et al. 2019

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A FEA-based methodology was developed in order to predict the wear status of an osteotome (surgical instrument) during its use in a lateral nasal bone osteotomy considering its fatigue strength. The latter parameter was determined by appropriate FEM-evaluation of the perpendicular impact test results. For the simulation of the surgical procedure, two scenarios were examined: (i) when utilizing a brand new osteotome and (ii) when utilizing an already used osteotome characterized by decreased fatigue strength. The actual nasal bone geometry used in the FEA model was obtained from a high-resolution, maxillofacial, computed tomography (CT) scan of a single patient. In both cases examined, depiction of fracture patterns for the osteotome and the nasal bone were obtained. The wear of a new osteotome and an already used osteotome was also calculated and compared. The developed von Mises stresses in both the osteotome and nasal bone were depicted. The proposed methodology allowed an accurate prediction of the critical number of impacts that the osteotome can receive during the lateral nasal osteotomy which is followed in all rhinoplasties. Based on the developed methodology, a preventive replacement of the osteotome before its extensive fracture can be determined, thereby minimizing the risk of postoperative complications.

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Section: Analytical Resultsmentioning

confidence: 99%

A FEA-Based Methodology to Predict the Osteotome Wear Status during Nasal Bone Surgical Operations

et al. 2019

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“…A detailed review of existing papers in the field of crack formation in multilayered coatings, with classification of types of cracks and analysis of the mechanisms of their formation, is given in [17]. The topic of mathematical modeling of cracking in multilayered coatings with the use of an axis-symmetrical finite element method (FEM) model was considered by Skordaris et al [18]. Wu et al [19,20] modeled cracking in single-layer coatings within the framework of linear elastic fracture mechanics (LEFM).…”

Section: Literature Reviewmentioning

confidence: 99%

Delamination and Longitudinal Cracking in Multilayered Composite Nanostructured Coatings and Their Influence on Cutting Tool Wear Mechanism and Tool Life

Vereschaka¹,

Grigoriev²,

Sitnikov³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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The wear and failure mechanism for multilayered nanostructured coatings has a number of significant differences from the one typical for monolithic single-layered coatings. In particular, while the strength of adhesion bonds at the "substrate-coating" boundary is important for monolithic coatings, then for multilayered nanostructured coatings, the strength of adhesion and cohesion bonds at interlayer boundaries and boundaries of separate nano-sublayers becomes of significant significance. Meanwhile, the delamination arising in the structure of multilayered nanostructured coatings can have both negative (leading to loss of coating uniformity and subsequent failure of coating) and positive influences (due to decrease of internal stresses and inhibition of transverse cracking). Various mechanisms of formation of longitudinal cracks and delaminations in coatings on rake tool faces, which vary based on the compositions and architectures of the coatings, are studied. In addition, the influence of internal defects, including embedded microdrops and pores, on the formation of cracks and delaminations and the failure of coatings is discussed. The importance of ensuring a balance of the basic properties of coatings to achieve high wear resistance and maximum tool life of coated metal-cutting tools is shown. The properties of coatings and the natures of their failures, as investigated during scratch testing and dry turning of steel C45, are provided.

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“…The convection mode would be dominant in consideration of that the droplet particles are heated in the air flow. Physical parameters for numerical analysis are listed in Table 1 [15][16][17][18] . According to the Lagrangian motion, equation of particles can be obtained as follows:…”

Section: Twas Flight Dynamicsmentioning

confidence: 99%

Microstructure and Flight Behaviors of Droplet and its Solidification in Twin-Wire Arc Sprayed Ni-Al Composite Coatings

Wang

Liu

et al. 2018

Mat. Res.

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Droplet flight and solidification behaviors during twin-wire arc sprayed (TWAS) composite coatings were systematically investigated. Both theoretical model and numerical method were established for calculating the droplet deformation, breakup and solidification process in air flow based on the volume of fluid (VOF) dual-phase flow model jointed with the standard k-ε model. The experimental simulation results indicate that TWAS droplet is broken through explosion or two steps breaking process. The calculation of TWAS gas flight dynamics demonstrates that the TWAS particles are accelerated at first and then slowed down. Microstructure of the TWAS prepared Ni-5wt.%Al and Ni-20wt.%Al composite coating was accordingly characterized by XRD, SEM and TEM, so the phase compositions of the Ni-Al composite coatings were obtained. TEM analysis also showed that an amorphous phase was formed according to the characteristic of diffraction ring in Ni matrix solid solution at an original state.

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A dynamic FEM simulation of the nano-impact test on mono- or multi-layered PVD coatings considering their graded strength properties determined by experimental–analytical procedures

Cited by 41 publications

References 23 publications

A FEA-Based Methodology to Predict the Osteotome Wear Status during Nasal Bone Surgical Operations

A FEA-Based Methodology to Predict the Osteotome Wear Status during Nasal Bone Surgical Operations

Delamination and Longitudinal Cracking in Multilayered Composite Nanostructured Coatings and Their Influence on Cutting Tool Wear Mechanism and Tool Life

Microstructure and Flight Behaviors of Droplet and its Solidification in Twin-Wire Arc Sprayed Ni-Al Composite Coatings

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