In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale

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BRODNIK ŽUGELJ, Blaž ;KALIN, Mitjan .
In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 63, n.6, p. 351-362, june 2018. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/in-situ-observations-of-a-multi-asperity-real-contact-area-on-a-submicron-scale/>. Date accessed: 05 jun. 2020. 
doi:http://dx.doi.org/10.5545/sv-jme.2017.4366.
Brodnik Žugelj, B., & Kalin, M.
(2017).
In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale.
Strojniški vestnik - Journal of Mechanical Engineering, 63(6), 351-362.
doi:http://dx.doi.org/10.5545/sv-jme.2017.4366
@article{sv-jmesv-jme.2017.4366,
	author = {Blaž  Brodnik Žugelj and Mitjan  Kalin},
	title = {In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {63},
	number = {6},
	year = {2017},
	keywords = {test rig; in-situ experiment; optical technique; asperities; real contact area},
	abstract = {We present apparatus that allows in-situ optical measurements of the evolving real contact area between a rigid glass and a deformable Al6026 surface with 700 nm of lateral and 20 nm of vertical resolution. In previous experimental studies of multi-asperity real contact area this was investigated either with much less accuracy or did not include the full (loaded) nominal contact area, which can hinder the relevant sub-micron deformation phenomena. During experiments involving the real contact area, the contact load and asperity deformations are simultaneously measured. To show the relevance of the developed experimental procedure measurements are compared to the results calculated with the Greenwood-Williamson (GW) and a modified Abbott-Firestone (AF(H)) models, which represent the two extreme deformation-regime models. The AF(H) model shows relatively good agreement between the real contact area and the asperity deformations (< 60 %), while the GW model deviates by up to 10 times, depending on the deformation value. In contrast, the GW model shows better agreement for the relationship between the contact load and the asperity deformation (< 20 %), while the AF(H) deviates by more, approximately 30 %. The results also indicate that the real contact area is a non-linear function of the contact load, while theoretical models predict their linearity. Finally, it is demonstrated that the real contact area reaches only up to 9 % of the nominal value in the loading range up to the material yield strength, as calculated for the nominal contact parameters. },
	issn = {0039-2480},	pages = {351-362},	doi = {10.5545/sv-jme.2017.4366},
	url = {https://www.sv-jme.eu/article/in-situ-observations-of-a-multi-asperity-real-contact-area-on-a-submicron-scale/}
}
Brodnik Žugelj, B.,Kalin, M.
2017 June 63. In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 63:6
%A Brodnik Žugelj, Blaž 
%A Kalin, Mitjan 
%D 2017
%T In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale
%B 2017
%9 test rig; in-situ experiment; optical technique; asperities; real contact area
%! In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale
%K test rig; in-situ experiment; optical technique; asperities; real contact area
%X We present apparatus that allows in-situ optical measurements of the evolving real contact area between a rigid glass and a deformable Al6026 surface with 700 nm of lateral and 20 nm of vertical resolution. In previous experimental studies of multi-asperity real contact area this was investigated either with much less accuracy or did not include the full (loaded) nominal contact area, which can hinder the relevant sub-micron deformation phenomena. During experiments involving the real contact area, the contact load and asperity deformations are simultaneously measured. To show the relevance of the developed experimental procedure measurements are compared to the results calculated with the Greenwood-Williamson (GW) and a modified Abbott-Firestone (AF(H)) models, which represent the two extreme deformation-regime models. The AF(H) model shows relatively good agreement between the real contact area and the asperity deformations (< 60 %), while the GW model deviates by up to 10 times, depending on the deformation value. In contrast, the GW model shows better agreement for the relationship between the contact load and the asperity deformation (< 20 %), while the AF(H) deviates by more, approximately 30 %. The results also indicate that the real contact area is a non-linear function of the contact load, while theoretical models predict their linearity. Finally, it is demonstrated that the real contact area reaches only up to 9 % of the nominal value in the loading range up to the material yield strength, as calculated for the nominal contact parameters. 
%U https://www.sv-jme.eu/article/in-situ-observations-of-a-multi-asperity-real-contact-area-on-a-submicron-scale/
%0 Journal Article
%R 10.5545/sv-jme.2017.4366
%& 351
%P 12
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 63
%N 6
%@ 0039-2480
%8 2018-06-27
%7 2018-06-27
Brodnik Žugelj, Blaž, & Mitjan  Kalin.
"In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale." Strojniški vestnik - Journal of Mechanical Engineering [Online], 63.6 (2017): 351-362. Web.  05 Jun. 2020
TY  - JOUR
AU  - Brodnik Žugelj, Blaž 
AU  - Kalin, Mitjan 
PY  - 2017
TI  - In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2017.4366
KW  - test rig; in-situ experiment; optical technique; asperities; real contact area
N2  - We present apparatus that allows in-situ optical measurements of the evolving real contact area between a rigid glass and a deformable Al6026 surface with 700 nm of lateral and 20 nm of vertical resolution. In previous experimental studies of multi-asperity real contact area this was investigated either with much less accuracy or did not include the full (loaded) nominal contact area, which can hinder the relevant sub-micron deformation phenomena. During experiments involving the real contact area, the contact load and asperity deformations are simultaneously measured. To show the relevance of the developed experimental procedure measurements are compared to the results calculated with the Greenwood-Williamson (GW) and a modified Abbott-Firestone (AF(H)) models, which represent the two extreme deformation-regime models. The AF(H) model shows relatively good agreement between the real contact area and the asperity deformations (< 60 %), while the GW model deviates by up to 10 times, depending on the deformation value. In contrast, the GW model shows better agreement for the relationship between the contact load and the asperity deformation (< 20 %), while the AF(H) deviates by more, approximately 30 %. The results also indicate that the real contact area is a non-linear function of the contact load, while theoretical models predict their linearity. Finally, it is demonstrated that the real contact area reaches only up to 9 % of the nominal value in the loading range up to the material yield strength, as calculated for the nominal contact parameters. 
UR  - https://www.sv-jme.eu/article/in-situ-observations-of-a-multi-asperity-real-contact-area-on-a-submicron-scale/
@article{{sv-jme}{sv-jme.2017.4366},
	author = {Brodnik Žugelj, B., Kalin, M.},
	title = {In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {63},
	number = {6},
	year = {2017},
	doi = {10.5545/sv-jme.2017.4366},
	url = {https://www.sv-jme.eu/article/in-situ-observations-of-a-multi-asperity-real-contact-area-on-a-submicron-scale/}
}
TY  - JOUR
AU  - Brodnik Žugelj, Blaž 
AU  - Kalin, Mitjan 
PY  - 2018/06/27
TI  - In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 63, No 6 (2017): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2017.4366
KW  - test rig, in-situ experiment, optical technique, asperities, real contact area
N2  - We present apparatus that allows in-situ optical measurements of the evolving real contact area between a rigid glass and a deformable Al6026 surface with 700 nm of lateral and 20 nm of vertical resolution. In previous experimental studies of multi-asperity real contact area this was investigated either with much less accuracy or did not include the full (loaded) nominal contact area, which can hinder the relevant sub-micron deformation phenomena. During experiments involving the real contact area, the contact load and asperity deformations are simultaneously measured. To show the relevance of the developed experimental procedure measurements are compared to the results calculated with the Greenwood-Williamson (GW) and a modified Abbott-Firestone (AF(H)) models, which represent the two extreme deformation-regime models. The AF(H) model shows relatively good agreement between the real contact area and the asperity deformations (< 60 %), while the GW model deviates by up to 10 times, depending on the deformation value. In contrast, the GW model shows better agreement for the relationship between the contact load and the asperity deformation (< 20 %), while the AF(H) deviates by more, approximately 30 %. The results also indicate that the real contact area is a non-linear function of the contact load, while theoretical models predict their linearity. Finally, it is demonstrated that the real contact area reaches only up to 9 % of the nominal value in the loading range up to the material yield strength, as calculated for the nominal contact parameters. 
UR  - https://www.sv-jme.eu/article/in-situ-observations-of-a-multi-asperity-real-contact-area-on-a-submicron-scale/
Brodnik Žugelj, Blaž, AND Kalin, Mitjan.
"In-situ Observations of a Multi-Asperity Real Contact Area on a Submicron Scale" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 63 Number 6 (27 June 2018)

Authors

Affiliations

  • University of Ljubljana, Faculty of Mechanical Engineering, Slovenia 1

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 63(2017)6, 351-362

https://doi.org/10.5545/sv-jme.2017.4366

We present apparatus that allows in-situ optical measurements of the evolving real contact area between a rigid glass and a deformable Al6026 surface with 700 nm of lateral and 20 nm of vertical resolution. In previous experimental studies of multi-asperity real contact area this was investigated either with much less accuracy or did not include the full (loaded) nominal contact area, which can hinder the relevant sub-micron deformation phenomena. During experiments involving the real contact area, the contact load and asperity deformations are simultaneously measured. To show the relevance of the developed experimental procedure measurements are compared to the results calculated with the Greenwood-Williamson (GW) and a modified Abbott-Firestone (AF(H)) models, which represent the two extreme deformation-regime models. The AF(H) model shows relatively good agreement between the real contact area and the asperity deformations (< 60 %), while the GW model deviates by up to 10 times, depending on the deformation value. In contrast, the GW model shows better agreement for the relationship between the contact load and the asperity deformation (< 20 %), while the AF(H) deviates by more, approximately 30 %. The results also indicate that the real contact area is a non-linear function of the contact load, while theoretical models predict their linearity. Finally, it is demonstrated that the real contact area reaches only up to 9 % of the nominal value in the loading range up to the material yield strength, as calculated for the nominal contact parameters.

test rig; in-situ experiment; optical technique; asperities; real contact area