Characteristics of Abrasive Particles and Their Implications on Wear

Pintaúde, Giuseppe

doi:10.5772/14618

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…Twenty particles whose average sizes are 360 ± 50 μm (alumina) and 460 ± 80 μm (glass) were randomly selected. Considering a previous discussion [12], we can sustain that the particle size does not influence the two-dimensional analysis of shape description and then the size effect can be omitted due to its minor significance. The images obtained from optical microscope were submitted to threshold process to convert it to binary images, whose contours are represented in Fig.…”

Section: Case Studies: Glass and Alumina Coated Papersmentioning

confidence: 62%

“…In addition, similar values may indicate that two-dimensional approach is inherently not able to incorporate the effect of size and hardness to explain pin abrasion results. This limitation was previously discussed by Pintaude [12], where similar shape parameters were unlikely to describe some of the wear results produced by different abrasive sizes.…”

Section: Case Studies: Glass and Alumina Coated Papersmentioning

confidence: 91%

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Remarks on the application of two-dimensional shape factors under severe wear conditions

Pintaúde

Coseglio

2016

Friction

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Abstract:The use of two-dimensional shape parameters to characterize abrasive particles is a potential approach to express their angularity. Nevertheless, in sliding abrasion, especially in pin abrasion testing, these descriptors could not be suitable for characterizing severe wear of engineering materials such as steels and cast irons. This work compares the applicability of two-dimensional shape parameters in describing severe wear of metals in recent pin abrasion tests with cases where they could have been correlated with the wear rates. Considering these aspects, this work puts in evidence the importance of clogging occurrence and the coated paper structure for a carefully application of shape parameters. In addition, it is proposed a possible relation between the shape parameters and one of the components of the abrasion factor.

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Section: Case Studies: Glass and Alumina Coated Papersmentioning

confidence: 62%

Section: Case Studies: Glass and Alumina Coated Papersmentioning

confidence: 91%

Remarks on the application of two-dimensional shape factors under severe wear conditions

Pintaúde

Coseglio

2016

Friction

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“…The same thing was demonstrated in [30] for different abrasives wearing WC-Co thermal sprayed coatings. When the abrasive particle is relatively soft to the abraded material, their mechanical properties play a key role during the wear process, and an extensive discussion on it can be found in [31].…”

Section: Pair K P (Equation 3) K P ' (Equation 4)mentioning

confidence: 99%

Introduction of the Ratio of the Hardness to the Reduced Elastic Modulus for Abrasion

Pintaúde¹

2013

Tribology - Fundamentals and Advancements

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/55470 . IntroductionModelinμ tνe wear rate is a complex process. Tνe several possibilities of cνemical, pνysical and mecνanical cνanμes at tνe interface are tνe most probable reasons for tνis [ ]. In tνis manner, it is reasonable to consider tνe wear rate as a stocνastic process [ , ], and indeed tνis approacν was taken into account by Arcνard [ ], wνen νe formulated νis well-known model. Since tνen, tνe majority of available models are based on νis proposition, independent on tνe cνaracteristics of mecνanical system. Considerinμ a sνarp contact, botν Torrance [ ] and YiLinμ & Zi-Sνan [ ] for slidinμ and rollinμ abrasion, respectively, modified Arcνard s equation based on elastic effects, and tνe ratio of tνe νardness H to tνe Younμ s modulus E was tνe main parameter of tνe models. In a triboloμical system witν dissimilar materials, for example a ceramic abradinμ a metal, one material can experience tνe yieldinμ and tνe otνer tνe brittle failure. Tνis difference in tνe mecνanical beνaviors can be decisive for tνe final performance to wear.Tνe use of Younμ s modulus to model tνe wear resistance was applied for coatinμs [ ] it appeared in otνer modifications of Arcνard s equation [ ], and even in empirical relationsνips between tνe wear rate and tνe mecνanical properties [ ]. Eventually, in all cited cases, tνe elastic modulus was not tνe reduced one E r , as will be treated νere.A selection of parameters involvinμ νardness and elastic moduli can be summarized Table [ -]. All of tνem νave pνysical meaninμs tνat possess some interest for abrasion resistance of materials. Tνe last parameter presented in Table , H /E , is proportional to tνe load tνat defines tνe transition between elastic to plastic contact in a ball-on-plane system, applyinμ tνe analytical solutions provided by Hertz in Contact Mecνanics [ ], wνere tνe reduced modulus is already taken into account. Parameter Physical meaning (taking into account a rigid-plastic material)H/E Deformation relative to yielding [9] (H/E) Usinμ some of tνe abovementioned solutions, a case study will be presented. For two triboloμical pairs witν known wear coefficients, tνe ratio of νardness to reduced modulus works well tνan tνe sinμle property of tνe worn material E . Tνe expectation reμardinμ tνe H/E r ratio is confirmed also by otνer aspects used to cνaracterize abrasion, especially tνe cuttinμ efficiency. . Modelling abrasion with E/H ratioIn Torrance [ ] publisνed a model for abrasive wear rate based on tνe elastic recovery after scratcνinμ, supposinμ tνat tνe abrasive particle νas a conical μeometry. Tνis cνoice is suitable, because tνere is an analytical model to describe tνe cνanμes at tνe recovered surface [ ]. Some years later, anotνer paper [ ] adopted tνe same pνysical basis but νere tνe application occurred to systems wνere tνe abrasive particles roll, instead of slide. Tνe key similarities and differences of botν manuscripts will be discussed below.First of all, it i...

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“…Twenty particles whose average size are 360 ± 50 µm (alumina) and 460 ± 80 µm (glass) were randomly selected. Considering some previous results [8,9], we can sustain that the particle size does not influence the two-dimensional analysis of shape description and then the size effect can be omitted due to its minor significance for the purpose of the present discussion. The images obtained from optical microscope were submitted to threshold process to convert the grayscale image to binary (Figure 6).…”

Section: Methodsmentioning

confidence: 68%

A Discussion on the Application of Bi-Dimensional Shape Factors of Particles Causing Severe Wear of Metals

Pintaúde¹,

Coseglio²

2014

ABM Proceedings

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The use of two-dimensional shape parameters to characterize abrasive particles is a possible approach to express their angularity. Nonetheless, in sliding abrasion, especially in pin abrasion testing, coated papers structure plays an important role and even its damage during the wear process should not be neglected. This manuscript discuss the limitations of two-dimensional shape descriptors in distinguishing wear caused by relatively hard particles, indicating that the wear data obtained in sliding abrasion tests are unable to distinguish different types of coated papers used when only the two-dimensional particle projection is considered for shape characterization.

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Characteristics of Abrasive Particles and Their Implications on Wear

Cited by 11 publications

References 33 publications

Remarks on the application of two-dimensional shape factors under severe wear conditions

Remarks on the application of two-dimensional shape factors under severe wear conditions

Introduction of the Ratio of the Hardness to the Reduced Elastic Modulus for Abrasion

A Discussion on the Application of Bi-Dimensional Shape Factors of Particles Causing Severe Wear of Metals

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