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Publikasjoner (6 av 6) Visa alla publikasjoner
Nikonovich, M., Ramalho, A. & Emami, N. (2024). Effect of cryogenic aging and test-environment on the tribological and mechanical properties of PEEK composites. Tribology International, 194, Article ID 109554.
Åpne denne publikasjonen i ny fane eller vindu >>Effect of cryogenic aging and test-environment on the tribological and mechanical properties of PEEK composites
2024 (engelsk)Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 194, artikkel-id 109554Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study investigated mechanical and tribological properties of polyetheretherketone (PEEK) and PEEK composites, before and after aging in liquid nitrogen for 5 months. Tribological tests conducted at 25 °C and at − 100 °C in air and in high vacuum (10−5 Pa) environment revealed the effect of matrix modification, fillers, environment, temperature, and cryogenic aging on their performances. Cryogenic aging of the polymers resulted in cryogenic embrittlement and decrease of the fracture toughness by around 10% and increase of wear rate by at least 20%. Very low coefficient of friction (0.02) was achieved in cryogenic vacuum environment for carbon fiber, graphite, and PTFE reinforced PEEK. The results indicate the significant impact of aging, temperature and environment on PEEK and its composites.

sted, utgiver, år, opplag, sider
Elsevier Ltd, 2024
Emneord
Cryogenic aging, PEEK composite, Tribology, Vacuum
HSV kategori
Forskningsprogram
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-104894 (URN)10.1016/j.triboint.2024.109554 (DOI)2-s2.0-85187960018 (Scopus ID)
Merknad

Validerad;2024;Nivå 2;2024-04-05 (marisr);

Full text license: CC BY

Tilgjengelig fra: 2024-03-26 Laget: 2024-03-26 Sist oppdatert: 2024-05-27bibliografisk kontrollert
Nikonovich, M. (2024). Tribological and Mechanical Performance of Thermoplastic Composites: Effect of Cryogenic Aging and Testing-Environment. (Doctoral dissertation). Luleå: Luleå University of Technology
Åpne denne publikasjonen i ny fane eller vindu >>Tribological and Mechanical Performance of Thermoplastic Composites: Effect of Cryogenic Aging and Testing-Environment
2024 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Luleå: Luleå University of Technology, 2024
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
HSV kategori
Forskningsprogram
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-105597 (URN)978-91-8048-589-0 (ISBN)978-91-8048-590-6 (ISBN)
Disputas
2024-09-03, E632, Luleå University of Technology, Luleå, 09:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2024-05-27 Laget: 2024-05-27 Sist oppdatert: 2024-06-18bibliografisk kontrollert
Nikonovich, M., Costa, J. F. .., Fonseca, A. C., Ramalho, A. & Emami, N. (2023). Structural, thermal, and mechanical characterisation of PEEK-based composites in cryogenic temperature. Polymer testing, 125, Article ID 108139.
Åpne denne publikasjonen i ny fane eller vindu >>Structural, thermal, and mechanical characterisation of PEEK-based composites in cryogenic temperature
Vise andre…
2023 (engelsk)Inngår i: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 125, artikkel-id 108139Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Thermal, thermo-mechanical and mechanical properties of four different commercially available polyetheretherketones (PEEK) based materials were investigated. PEEK matrix was either modified and/or reinforced with carbon fibres, graphite and/or PTFE. Impact strength was measured at three different temperatures: 25 °C, −100 °C, and −195 °C. At 25 °C, thermal stability and mechanical properties, including the elastic modulus, compression, and impact strength, were enhanced with the addition of carbon fibres. Matrix modification had a minor impact on thermal stability, while the mechanical properties decreased, except for impact strength. At −100 °C, the mechanical properties of the neat polymers were improved, including increased impact strength by 20% compared to values at 25 °C. Addition of fillers hindered the rise of impact strength due to complex mechanisms caused by different coefficients of thermal expansion of reinforcements and matrix. At −195 °C, the significant increase of impact strength was revealed for unmodified PEEK reaching 30 times higher values than at 25 °C, while matrix modification suppressed the rise of impact strength. The scratch test indicated the superior behaviour of unfilled PEEK during the tested load range (up to 15 N), while the effect of the fillers was observed at much lower load threshold of 7 N.

sted, utgiver, år, opplag, sider
Elsevier, 2023
Emneord
Cryogenic temperature, Fractography, Impact behaviour, Polymer-matrix composites (PMCs), Thermal properties
HSV kategori
Forskningsprogram
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-99484 (URN)10.1016/j.polymertesting.2023.108139 (DOI)001048242600001 ()2-s2.0-85164561685 (Scopus ID)
Forskningsfinansiär
EU, Horizon 2020, 860246
Merknad

Validerad;2023;Nivå 2;2023-08-11 (hanlid)

Tilgjengelig fra: 2023-08-11 Laget: 2023-08-11 Sist oppdatert: 2024-05-27bibliografisk kontrollert
Nikonovich, M., Ramalho, A. & Emami, N.Cryogenic cyclic aging effect on thermal, mechanical and tribological performance of PEEK-based materials.
Åpne denne publikasjonen i ny fane eller vindu >>Cryogenic cyclic aging effect on thermal, mechanical and tribological performance of PEEK-based materials
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Emneord
PEEK composite, tribology, cryogenic temperature, cryogenic cyclic aging
HSV kategori
Identifikatorer
urn:nbn:se:ltu:diva-105594 (URN)
Tilgjengelig fra: 2024-05-24 Laget: 2024-05-24 Sist oppdatert: 2024-05-27
Nikonovich, M., Ramalho, A. & Emami, N.Impact of test-environment and cryogenic aging on mechanical properties and tribological performance of PI-based materials.
Åpne denne publikasjonen i ny fane eller vindu >>Impact of test-environment and cryogenic aging on mechanical properties and tribological performance of PI-based materials
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Abstract [en]

This study investigates the effect of test-environment, temperature, and cryogenic aging in liquid nitrogen for 5 months on mechanical and tribological performance of polyimide (PI) and PI composites. Tribological tests were conducted at 25 °C in air, and at both 25 °C and -100 °C in a high vacuum (10-5 Pa) environment. Impact of cryogenic aging, testing condition on PI-based materials varied depending on the polymer structure and composition. Cryogenic aging led to embrittlement, increasing the coefficient of friction and wear rate up to 77% and 165%, respectively. Some polyimides exhibited the lowest coefficient of friction (0.04) in vacuum at 25°C, while the temperature reduction to -100 oC in vacuum generally decreased the tribological performance, increased contact stresses and abrasive wear of the materials. 

Emneord
polyimide, vacuum, cryogenic temperature, cryogenic aging
HSV kategori
Identifikatorer
urn:nbn:se:ltu:diva-105593 (URN)
Tilgjengelig fra: 2024-05-24 Laget: 2024-05-24 Sist oppdatert: 2024-05-27
Nikonovich, M., Ramalho, A. & Emami, N.Influence of cryogenic cyclic aging on thermal, mechanical and tribological performance of PI-based materials.
Åpne denne publikasjonen i ny fane eller vindu >>Influence of cryogenic cyclic aging on thermal, mechanical and tribological performance of PI-based materials
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Emneord
PI composite, tribology, cryogenic cyclic aging, vacuum
HSV kategori
Identifikatorer
urn:nbn:se:ltu:diva-105595 (URN)
Tilgjengelig fra: 2024-05-24 Laget: 2024-05-24 Sist oppdatert: 2024-05-27
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-8025-5104