Mechanically induced desorption

Řepa, P.

doi:10.1016/0042-207x(92)90039-y

Cited by 18 publications

(8 citation statements)

References 6 publications

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“…In addition, this model corrects some errors present in [63]. ò ò (11) where k max = m + 1 or k max = k c whichever is smaller.…”

Section: New Trends and Developments In Metrologymentioning

confidence: 98%

“…The radiant flux directed to the photodiode detector is given by the following expressions in dimensionless form: After substitution (14) in (11) the received radiant power can be obtained by integration in polar coordinates: Finally, the most realistic theoretical irradiance function was developed by He and Cuomo [56] as a piecewise-defined smooth function composed of eight formulas. These formulas combine according to the values of the parameters k and k c .…”

Section: New Trends and Developments In Metrologymentioning

confidence: 99%

“…These new techniques have been evolved towards both enhancement of their features and integration with other techniques. Combination of mechanical , physical and chemical characterization [4] has offered the opportunity to study complex processes of gas-phase lubrication [10], mechanically stimulated gas emission [4,[11][12][13], triboplasma [14][15][16], triboelectrification [17], triboluminescence [15,16,18], emission of charged particles [19,20], tribochemical reactions [21][22][23][24][25], and so on. On the other hand, nanoindentation has become widespread as a method to study the mechanical response of materials [26], particularly the measurement of hardness [27,28], elastic modulus [27,28], hardening exponents [29], creep parameters [30], and residual stresses [31].…”

Section: Introductionmentioning

confidence: 99%

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Force Measuring System for High-Precision Surface Characterization under Extreme Conditions

Nevshupa¹,

Conte²

2016

New Trends and Developments in Metrology

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Force measuring is used in various surface characterization techniques such as indentation, scratch tests, tribological analysis, determination of gas content, etc. The main problems related with force measurement under extreme conditions have been analysed. A strategy that should be followed to solve these problems has been discussed and several examples of successive solutions that recently were developed by the authors are presented. The need to carry out the characterization under extreme conditions poses serious problems for the designers of the measuring systems that may include the incompatibility of the sensors with the test conditions, undesirable interactions with other components, stability, precision and uncertainty issues, the measurement range, etc. Resolving these problems must be based on a global approach in which the characterization system is considered as a whole, while the designer must analyse and solve the possible conflicts between the subsystems. The way how an appropriate force measuring system can be selected is described. The proposed method is illustrated by an example in which an indirect force measurement using optical fibre displacement sensor was used. Another example describes measuring system developed for vacuum high-temperature nanoindentation. At high temperature, proper heat management based on noncontact heating and laminar flow cooling system is mandatory to avoid experimental data being affected by external noise and thermal drift.

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“…In addition, this model corrects some errors present in [63]. ò ò (11) where k max = m + 1 or k max = k c whichever is smaller.…”

Section: New Trends and Developments In Metrologymentioning

confidence: 98%

Section: New Trends and Developments In Metrologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Force Measuring System for High-Precision Surface Characterization under Extreme Conditions

Nevshupa¹,

Conte²

2016

New Trends and Developments in Metrology

View full text Add to dashboard Cite

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“…For metallic alloys, hydrogen is generally the primary emitted gas, whereas traces of methane, carbon mono-and dioxide, as well as water vapours among others can also be detected (24,25). By doping metals with deuterium, it was shown that mechanically stimulated hydrogen emission is associated with hydrogen being dissolved and occluded in the bulk of the metal (26).…”

Section: Mechanically Stimulated Gas Emission As a Novel Phenomenologmentioning

confidence: 99%

TriDes – a new tool for the design, development and non-destructive evaluation of advanced construction steels

et al. 2016

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Design and development of advanced steel types require establishing an optimal combination of mechanical strength, resistance to hydrogen degradation and durability, among others; however, the available tools for assessing some of these properties are limited. A novel tool for supporting the design and development of steel types was therefore created. This tool, called TriDes, is based on the phenomenon of mechanically stimulated gas emission and allows for determining mechanical properties and hydrogen concentration locally, with high spatial resolution and during different phases of the service life of construction steel elements. Its applicability to the development of pipe steel with improved durability, as well as to steel types used in marine environments, has been investigated. RESUMEN: TriDes -una nueva herramienta para el diseño, desarrollo y evaluación no destructiva de aceros avanzados de construcción.El diseño y desarrollo de acero avanzado requiere establecer una combinación óptima de resistencia mecánica, resistencia a la degradación por hidrógeno y la durabilidad, entre otras. Sin embargo, las herramientas disponibles para evaluar experimentalmente algunas de estas propiedades son limitadas. Por lo tanto se creó una nueva herramienta, llamada TriDes. Esta técnica está basada en un principio físico distinto de los que se usan en las técnicas establecidas y combina la caracterización de hidrógeno en el acero en y la caracterización mecánica y/o tribológica. La técnica es portatil lo que permite determinar concentración local de hidrógeno con alta resolución espacial durante todo el ciclo de vida de elementos fabricados en acero y además evaluar la dureza y resistencia al desgaste del acero. Se ha investigado la capacidad de la técnica para el desarrollo de aceros para aplicaciones en gasoductos y construcciones marinas.

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“…Ultrahigh vacuum and/or controlled ambient atmosphere are the necessary conditions when studying gas-phase lubrication [9], mechanically stimulated gas emission (MSGE) [10][11][12][13][14][15][16][17][18][19][20], triboplasma [21][22][23], triboelectrification [24][25][26], triboluminescence [24,27,28], emission of charged particles [29][30][31], tribochemical reactions [23,[32][33][34], etc. For these studies, conventional tribological test rigs should be combined with various physical, chemical and surface characterization techniques.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh vacuum system for advanced tribology studies: Design principles and applications

Nevshupa

Conte

Igartua

et al. 2015

Tribology International

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a b s t r a c tThe main difficulty in designing of an ultrahigh vacuum (UHV) tribometer combined with tribophysical and tribochemical characterization techniques is to find the critical compromise between the scientific requirements and technical or technological limitations from different subsystems and components. The principal conflicts, their possible solutions and the recommended tribometer configurations are analyzed. The developed methodological principles were applied for designing and construction of two UHV experimental tribological systems: TriDes-2 and Ca 3 UHV. The advances in the design and development of the vacuum system as well as the UHV force sensor and sample holder are presented and discussed.

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Mechanically induced desorption

Cited by 18 publications

References 6 publications

Force Measuring System for High-Precision Surface Characterization under Extreme Conditions

Force Measuring System for High-Precision Surface Characterization under Extreme Conditions

TriDes – a new tool for the design, development and non-destructive evaluation of advanced construction steels

Ultrahigh vacuum system for advanced tribology studies: Design principles and applications

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