Elastic recovery of a scratch in a polymeric surface: experiments and analysis

Gauthier, Christian; Lafaye, S.; Schirrer, R.

doi:10.1016/s0301-679x(01)00043-3

Cited by 167 publications

(81 citation statements)

References 11 publications

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“…The corresponding stress level (σ repr = σ when p = 35%) was used throughout our analysis when appropriate. Furthermore, as the scratch test is often used to determine characteristics of polymeric coatings, this is also under investigation [Briscoe et al 1996;Gauthier et al 2001]. It should be mentioned in this context that for polymers in particular, the Johnson parameter only gives a rough estimate of the deformation behaviour at scratching due to strain hardening effects in the material surrounding the stylus [Bucaille 2001;Bucaille et al 2002;Hochstetter et al 2003;Bucaille et al 2004].…”

Section: Introductionmentioning

confidence: 99%

Delamination of thin coatings at scratching: experiments and numerics

Wredenberg

Larsson

2009

JOMMS

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Scratching of thin coatings on hard substrates is studied experimentally and numerically, in the latter case by use of the finite element method. In particular the delamination behaviour at scratching, by increasing the normal load up to failure, is of interest. The adhesion of the coating to the substrate is modelled as a cohesive zone where relevant model parameters are determined experimentally using the double cantilever beam test with uneven bending moments (DCB-UBM). Good correlation between experimental and numerical results were achieved and the most important finding confirms the fact that the delamination behaviour was very much dependent on the critical energy release rate of the film/substrate interface. The results achieved are directly relevant for thin film polymer coatings but can also be applied in more general situations as a comprehensive parameter study is performed using the finite element method.

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Section: Introductionmentioning

confidence: 99%

Delamination of thin coatings at scratching: experiments and numerics

Wredenberg

Larsson

2009

JOMMS

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“…They are tough and brittle at low temperature and/or high strain rate and rather soft and ductile at higher temperature and/or low strain rate [10,11]. Previous experiemental work carried out by Briscoe [4,5] and later Gauthier [9] has characterized the behaviour of the amorphous glassy polymers during scratch tests. Through the infuence of the scratching velocity, at fixed temperature, they have shown a behaviour both viscoelastic and viscoplastic.…”

Section: Introductionmentioning

confidence: 99%

Mechanical study of polymers in scratch test

et al. 2008

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The numerical study of the scratch test on glassy polymers needs a well adapted mechanical behaviour law both viscoelastic and viscoplastic. To test different models, an algorithm which allows to assembly in series two models has been developped. In our cas, it is used to associate a viscoelastic model with viscoplastic one. The simulations carried out lead to some phenomenological results showing the importance to account for the time dependency of the stiffness modulus.

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“…The surfaces of polymeric materials are predominantly sensitive to scratches, which obstruct their use for high performance optical devices. In other state of affairs, these materials are used for moving mechanical parts, where friction and wear properties are important [10]. Scratches on plastic surfaces seriously trim down the surface aesthetics of the polymer products and also lead to stress concentration, making products prone to premature failure.…”

Section: Introductionmentioning

confidence: 99%

“…Scratch method offers an appropriate and trustworthy way to study the mechanical properties of organic polymers under different contact conditions [6,10,11,[13][14][15][16]. A number of researchers have used scratch test to evaluate resistance to scratch for different polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Gauthier et al observed the transition from viscoplastic scratching to elastic sliding and found that the temperature, strain and strain rate are the important parameters controlling the nature of scratching on viscoelastic viscoplastic materials like polymers [10]. They proved for the macroscopic scale that the mechanical performance of the contact is tailored by the decrease in the friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of the effect of PEG and Crodamide on the scratch resistance of PMMA

Muhammad¹,

Gauthier²,

Gérard³

et al. 2010

Tribology and Design

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Scratch durability of polymer surfaces and coatings is becoming crucial for the growing use of these materials in innovative applications, replacing former materials with more resistant surfaces. A variety of physico-chemical processes such as annealing and a range of ion plantation techniques have been proved very valuable for the renovation of polymeric surfaces but their applications are restricted to some certain polymers due to a number of disadvantages. In particular, several of them can not be applied to translucent polymers like PMMA due to their darkening outcome. Enhancement of the scratch resistance must be investigated for the most part as a consequence due to decreasing the friction coefficient. The recovery increases if the tip is smooth or if the local friction coefficient is low. Discovery of appropriate plasticizers for different polymers to decrease their surface friction is yet to be made in order to improve their scratch resistance.The effect of PEG and crodamide on both surface properties and bulk mechanical properties of PMMA was studied over a wide range of temperature (ranging from -40 to +85°C). Our experimental results show that a decrease in friction coefficient is possible by the introduction of appropriate plasticizer without having a significant effect on its bulk behaviour and this decrease in friction depends upon the nature and the content of plasticizer. Moreover, fatty acid amides have been proved more effective in decreasing friction than PEG. The friction decreases directly with the percentage of crodamide. The values of the rear contact angle and in-situ photographs during scratching confirm that the decrease in friction is associated with the decrease of yielding of the contact between the tip and the polymer surface.

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Elastic recovery of a scratch in a polymeric surface: experiments and analysis

Cited by 167 publications

References 11 publications

Delamination of thin coatings at scratching: experiments and numerics

Delamination of thin coatings at scratching: experiments and numerics

Mechanical study of polymers in scratch test

Comparative study of the effect of PEG and Crodamide on the scratch resistance of PMMA

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