Fracture mechanics based analysis of the scratch resistance of thin brittle coatings on a soft interlayer

Favache, Audrey; Sacre, Charles-Henry; Coulombier, Michaël; Libralesso, L.; Guaino, Philippe; Raskin, Jean‐Pierre; Bailly, Christian; Nysten, Bernard; Pardoen, Thomas

doi:10.1016/j.wear.2015.01.081

Cited by 27 publications

(6 citation statements)

References 25 publications

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“…Pęknięcia tego typu są wynikiem naprężeń rozciągających w powłoce powstałych w wyniku zginania powłoki pod indenterem i wyboczenia w kierunku przesuwania indentera. W pracy [20] opisano ten mechanizm. Stwierdzono, że powłoka pęka przed i po bokach indentera.…”

Section: Rys 4 śRedni Przebieg Siły Tarcia (Ft) W Funkcji Drogi Tarunclassified

Preliminarny studies on scratch resistance of the face shields surface of firefighting helmets

Pieniak

Walczak

2019

atest

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Nowadays, in rescue operations firefighters of the State Fire Service use firefighting helmets which protect their head. Type B helmets in accordance with PN EN 433 technical norm are most often used. The face shields of firefighting helmets are usually made of transparent polycarbonate. One layer of metalized coatings, usually made in PVD technology are often applied on the shield surface. Sometimes multi-layer and gradient coatings are also applied. The surface of a visor may get damaged. Surface damages limit the field of rescuer view, and also adversely influence on barrier properties of the shield. One of the utility criterion for face shields and glasses of firefighting helmets is scratch resistance. Comparative studies on scratch resistance of surface were performed. The test was conducted with the use of Rockwell diamond cone. Small differences in scratch resistance were shown. The mechanism of surface degradation due to scratch of studied shields were varied. The highest resistance against the indenter was obtained in case of the shield surface of the Kontekst helmet. The lowest surface degradation was observed for the helmet with the shield face covered by metalized coating - Gallet. The face shields of helmets without coating were characterized by higher dam-ages. The highest damage was obtained in case of the Kontekst helmet.

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Section: Rys 4 śRedni Przebieg Siły Tarcia (Ft) W Funkcji Drogi Tarunclassified

Preliminarny studies on scratch resistance of the face shields surface of firefighting helmets

Pieniak

Walczak

2019

atest

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“…Favache et al [10] investigated the scratch resistance of a functional multilayer structure that consisted of a brittle coating of CrN, a soft interlayer of polymide and a silicon substrate. In their study, brittle fractures on the hard film were found to be dominant during scratching, but the high elastic mismatch between two films significantly influenced the crack energy release rate and hence determined the crack density, as shown in Fig.…”

Section: Top Surface Nanoscratchingmentioning

confidence: 99%

“…Thin films usually refer to a layer of material with thicknesses ranging from several nanometers to several micrometers [2]. Till now, different types of structures of dissimilar thin film materials, such as metal/ ceramic, polymer/metal and ceramic/polymer have been fabricated for various purposes [3][4][5][6][7][8][9][10]. Those thin film materials or structures provide distinct advantages over conventional bulk counterparts in terms of cost efficiency, long lifespan, environmental friendliness and enhanced thickness-dependent properties [11,12].…”

Section: Introductionmentioning

confidence: 99%

Deformation, failure and removal mechanisms of thin film structures in abrasive machining

Kang¹,

Huang²

2017

Adv. Manuf.

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Thin film structures are becoming increasingly more important for industrial applications such as the making of solar panels, microelectronic devices and micro systems. However, the challenges encountered in the machining of thin film structures have been a bottleneck that impedes further wide spread uses of such structures. The development of material removal processes that are capable of producing a damage free surface at high removal rates is critical for cost effective production. Such development relies highly on a comprehensive understanding of the deformation, failure and removal mechanisms of thin film structures involved in mechanical loading. In this paper, the current understanding of the deformation characteristics of thin film systems was reviewed to provide important insights into the interfacial failure under mechanical loading, with focuses on the interfacial failure mechanisms and existing problems in the machining of thin film structures. The key characterization techniques were outlined. In particular, the recent progress in the abrasive machining of a thin film multilayer structure was summarized. The potential research directions were also presented in the end of the review.

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“…When evaluating the fracture properties of thin and ultra-thin materials, however, standard test procedures cannot be applied. A multitude of adapted approaches [2] have therefore been developed and presented in the past: bending [3,4], buckling [5,6], scratching [7,8], micro-cantilever indentation [9,10], bulge testing [11], as well as nano-indentation [12,13] tests have proven successful at determining the critical parameters for failure criteria. Unfortunately, extensive sample preparation [3,11] is often times required, which involves the risk of modifying the coating structure and its response to loading.…”

Section: Introductionmentioning

confidence: 99%

Mode I fracture toughness determination in Cu/W nano-multilayers on polymer substrate by SEM - Digital Image Correlation

Brandt

Salvati

Bourhis

et al. 2020

Journal of the Mechanics and Physics of Solids

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Nanostructured metallic multilayers with carefully designed mechanical and functional properties are omnipresent in cutting edge technological applications. To ensure the mechanical integrity of such coatings, the Mode I critical stress intensity factor KIC is used to quantify their fracture toughness in order to avoid material failure by appropriate design. In this article, we present a novel approach for the KIC determination of thin and ultrathin films on compliant substrate, based on micro-displacement field analysis using Digital Image Correlation within SEM. Using this method, KIC of a Cu/W nano-multilayer with a total coating thickness of 240 nm was determined as K !" = 4.8 ± 0.05 MPa√m, showing excellent agreement with the values published for comparable systems in the literature. To verify the validity of the chosen approach, two independent finite element simulations were employed, thus revealing the role and effect of the compliant substrate on the stress and displacement fields arising around the crack tip in thin films.

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Fracture mechanics based analysis of the scratch resistance of thin brittle coatings on a soft interlayer

Cited by 27 publications

References 25 publications

Preliminarny studies on scratch resistance of the face shields surface of firefighting helmets

Preliminarny studies on scratch resistance of the face shields surface of firefighting helmets

Deformation, failure and removal mechanisms of thin film structures in abrasive machining

Mode I fracture toughness determination in Cu/W nano-multilayers on polymer substrate by SEM - Digital Image Correlation

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