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Publications (10 of 11) Show all publications
Fernberg, P., Gong, G., Mannberg, P. & Tsampas, S. (2018). Development of novel high Tg polyimide-based composites: Part I: RTM processing properties. Journal of composite materials, 52(2), 253-260
Open this publication in new window or tab >>Development of novel high Tg polyimide-based composites: Part I: RTM processing properties
2018 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 52, no 2, p. 253-260Article in journal (Refereed) Published
Abstract [en]

In this study, an assessment of the composite processing-related properties of a newly developed 6-FDA-based phenylethynyl-terminated polyimide (available under the tradename NEXIMID®MHT-R) is presented. Processing schemes, used for preparing high quality carbon fibre-reinforced composites by the use of conventional resin transfer moulding are developed and presented. The influences of manufacturing parameters on glass transition temperature of the composites are presented. The results confirm that composites with exceptionally high Tg, in the range between 350 and 460℃ can be achieved. A manufacturing scheme that yields in composites with Tg of 370℃ is presented and proposed as a good candidate to serve as baseline for further studies.

Place, publisher, year, edition, pages
Sage Publications, 2018
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-63438 (URN)10.1177/0021998317705705 (DOI)000419136300009 ()2-s2.0-85040026740 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-01-19 (andbra)

Available from: 2017-05-18 Created: 2017-05-18 Last updated: 2018-01-23Bibliographically approved
Tsampas, S., Fernberg, P. & Joffe, R. (2018). Development of novel high Tg polyimide-based composites: Part II: Mechanical characterisation. Journal of composite materials, 52(2), 261-274
Open this publication in new window or tab >>Development of novel high Tg polyimide-based composites: Part II: Mechanical characterisation
2018 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 52, no 2, p. 261-274Article in journal (Refereed) Published
Abstract [en]

In this study, the mechanical performance assessment of a newly developed carbon fibre-reinforced polyimide composite system T650/NEXIMID® MHT-R is presented. This system was subjected to a series of mechanical tests at ambient and elevated temperature (320℃) to determine basic material properties. Moreover, an additional test was conducted, using a T650/NEXIMID® MHT-R laminate in which the fibre sizing was thermally removed prior to laminate manufacturing, to investigate the effect of fibre treatment on mechanical performance. The experimental results indicated that the T650/NEXIMID® MHT-R composites along with exceptionally high Tg (360–420℃) exhibited competitive mechanical properties to other commercially available polyimide and epoxy-based systems. At elevated temperature, the fibre-dominated properties were not affected whilst the properties defined by matrix and fibre/matrix interface were degraded by approximately 20–30%. Finally, the fibre sizing removal did not affect the tensile and compressive strength, however, the shear strength obtained from short-beam shear test was deteriorated by approximately 15%. to serve as baseline for further studies.

Place, publisher, year, edition, pages
Sage Publications, 2018
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-63439 (URN)10.1177/0021998317705706 (DOI)000419136300010 ()2-s2.0-85040032640 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-01-19 (andbra)

Available from: 2017-05-18 Created: 2017-05-18 Last updated: 2018-01-23Bibliographically approved
Zrida, H., Fernberg, P., Ayadi, Z. & Varna, J. (2017). Microcracking in thermally cycled and aged Carbon fibre/polyimide laminates. International Journal of Fatigue, 94(1), 121-130
Open this publication in new window or tab >>Microcracking in thermally cycled and aged Carbon fibre/polyimide laminates
2017 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 94, no 1, p. 121-130Article in journal (Refereed) Published
Abstract [en]

Carbon fibre T650 8-harness satin weave fabric composites with thermosetting polyimide resin designed for high service temperatures are solidified at 340 °C. High thermal stresses develop after cooling down to room temperature, which lead to multiple cracking in bundles of the studied quasi-isotropic composite. The composites are subjected to two thermal cycling ramps and the increase of crack density in each bundle is quantified. Comparison of two ramps with the same lowest temperature shows that the highest temperature in the cycle has a significant effect on thermal fatigue resistance. During thermal aging tests at 288 °C the mechanical properties are degrading with time and the crack density after certain aging time is measured. Aging and fatigue effects are separately analysed showing that part of the cracking in thermal cycling tests is related to material aging during the high temperature part of the cycle. Numerical edge stress analysis and fracture mechanics are used to explain observations. The 3-D finite element edge stress analysis reveals that there is large edge effect that induces a large difference in the damage state between the different layers on the edge. The linear elastic fracture mechanics explains the higher initiated and propagated crack density in the surface layers comparing to the inner layers.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Polymer Technologies Textile, Rubber and Polymeric Materials
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-45927 (URN)10.1016/j.ijfatigue.2016.09.017 (DOI)000388781200011 ()2-s2.0-84991721393 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-10-03 (andbra)

Available from: 2016-10-04 Created: 2016-10-04 Last updated: 2018-09-13Bibliographically approved
Fernberg, P. (2016). Fibre reinforced polyimide composites and structures manufactured with resin transfer moulding: Overview of procedures and properties. In: ECCM 2016: Proceeding of the 17th European Conference on Composite Materials. Paper presented at 17th European Conference on Composite Materials, Munich, Germany, 26-30th June 2016. European Conference on Composite Materials
Open this publication in new window or tab >>Fibre reinforced polyimide composites and structures manufactured with resin transfer moulding: Overview of procedures and properties
2016 (English)In: ECCM 2016: Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials , 2016Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, the major outcomes from a recently completed research program with ambition to develop polyimide carbon fibre composites with temperature ability above 360°C are reported. Data from characterisation of the processing properties such as viscosity and cure behaviour are presented alongside with data on the mechanical properties at room temperature of quasi-isotropic composites based on the developed resin and 8-harness satin weave carbon fibre fabrics. The paper also contains a demonstration of the use the material system in a demonstrator component.

Place, publisher, year, edition, pages
European Conference on Composite Materials, 2016
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-63251 (URN)2-s2.0-85017683860 (Scopus ID)978-3-00-053387-7 (ISBN)
Conference
17th European Conference on Composite Materials, Munich, Germany, 26-30th June 2016
Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2018-01-16Bibliographically approved
Varna, J., Zrida, H. & Fernberg, P. (2016). Microdamage analysis in thermally aged CF/polyimide laminates. Paper presented at 37th Risø International Symposium on Materials Science, 5 - 8 September 2016, Technical University of Denmark Risø Campus, Roskilde. IOP Conference Series: Materials Science and Engineering, 139, Article ID 012050.
Open this publication in new window or tab >>Microdamage analysis in thermally aged CF/polyimide laminates
2016 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 139, article id 012050Article in journal (Refereed) Published
Abstract [en]

Microdamage in layers of CF Thornel® T650 8-harness satin woven composite with thermosetting polyimide NEXIMID® MHT-R resin was analysed. After cooling to room temperature multiple intra-bundle cracking due to tensile transverse thermal stresses was observed in the studied [(+45/-45)/(90/0)]2s composite. The composite was subjected to thermal cycling quantifying the increase of crack density in layers. Comparison of two ramps with the same lowest temperature shows that the highest temperature in the cycle has a significant detrimental effect. Exposure for 40 days to 288°C caused many new cracks after cooling down to room temperature. Both aged and not aged specimens were tested in uniaxial quasi-static tension. Cracking was analysed using fracture mechanics and probabilistic approaches. Cracking in off-axis layers was predicted based on Weibull analysis of the 90- layer. The thermal treatment degraded the cracking resistance of the surface layer and of the next layer.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-59579 (URN)10.1088/1757-899X/139/1/012050 (DOI)000392730000050 ()2-s2.0-84989345037 (Scopus ID)
Conference
37th Risø International Symposium on Materials Science, 5 - 8 September 2016, Technical University of Denmark Risø Campus, Roskilde
Note

2017-02-23 (andbra);Konferensartikel i tidskrift

Available from: 2016-10-07 Created: 2016-10-07 Last updated: 2018-07-10Bibliographically approved
Mellin, P., Jönsson, C., Åkermo, M., Fernberg, P., Nordenberg, E., Brodin, H. & Strondl, A. (2016). Nano-sized by-products from metal 3D printing, composite manufacturing and fabric production. Journal of Cleaner Production, 139, 1224-1233
Open this publication in new window or tab >>Nano-sized by-products from metal 3D printing, composite manufacturing and fabric production
Show others...
2016 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 139, p. 1224-1233Article in journal (Refereed) Published
Abstract [en]

Recently, the health and environmental perspective of nano-materials has gained attention. Most previous work focused on Engineered Nanoparticles (ENP). This paper examines some recently introduced production routes in terms of generated nano-sized by-products. A discussion on the hazards of emitting such particles and fibers is included.

Fine by-products were found in recycled metal powder after 3D printing by Selective Laser Melting (SLM). The process somehow generated small round metal particles (∼1–2 μm) that are possibly carcinogenic and respirable, but not small enough to enter by skin-absorption. With preventive measures like closed handling and masks, any health related effects can be prevented.

The composite manufacturing in particular generated ceramic and carbonaceous particles that are very small and respirable but do not appear to be intrinsically toxic. The smallest features in agglomerates were about 30 nm. Small particles and fibers that were not attached in agglomerates were found in a wide range of sizes, from 1 μm and upwards. Preventive measures like closed handling and masks are strongly recommended.

In contrast, the more traditional production route of fabric production is investigated. Here, brushing residue and recycled wool from fabric production contained few nano-sized by-products.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-59674 (URN)10.1016/j.jclepro.2016.08.141 (DOI)000386991600112 ()2-s2.0-84995543561 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-10-12 (andbra)

Available from: 2016-10-12 Created: 2016-10-12 Last updated: 2018-07-10Bibliographically approved
Tsampas, S., Fernberg, P. & Joffe, R. (2016). The effect of high temperature on the mechanical performance of novel high Tg polymide-based carbon fibre-reinforced laminates (ed.). In: (Ed.), ECCM 2016: Proceeding of the 17th European Conference on Composite Materials. Paper presented at 17th European conference on composite materials, ECCM-17, Munich, Germany, 26-30 June 2016. European Conference on Composite Materials
Open this publication in new window or tab >>The effect of high temperature on the mechanical performance of novel high Tg polymide-based carbon fibre-reinforced laminates
2016 (English)In: ECCM 2016: Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials , 2016Conference paper, Published paper (Refereed)
Abstract [en]

In this study, the outcomes from the mechanical testing of the carbon fibre-reinforced polyimide composite system T650/NEXIMID® MHT-R at ambient and elevated temperatures are presented. These results are compared to assess the effect of mechanical loading at 320°C on the performance of the system in tension, compression and Short-Beam Shear. The experimental campaign indicated that the mechanical loading at 320°C had a trivial effect on the tensile properties (fibre-dominated) whilst a more pronounced effect was noted on the compression and Short-Beam Shear (matrix and fibre/matrix interface-dominated properties).

Place, publisher, year, edition, pages
European Conference on Composite Materials, 2016
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-38074 (URN)2-s2.0-85017672206 (Scopus ID)c57eaa5a-b47c-4905-9513-8bb9874cdcfc (Local ID)978-3-00-053387-7 (ISBN)c57eaa5a-b47c-4905-9513-8bb9874cdcfc (Archive number)c57eaa5a-b47c-4905-9513-8bb9874cdcfc (OAI)
Conference
17th European conference on composite materials, ECCM-17, Munich, Germany, 26-30 June 2016
Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-16Bibliographically approved
Zrida, H., Fernberg, P. & Varna, J. (2015). Effect of extreme temperatures on micro-damage development in CF/polyimide laminates (ed.). In: (Ed.), 20th International Conference on Composite Materials: Copenhagen, 19-24th July 2015. Paper presented at International Conference on Composite Materials : 19/07/2015 - 24/07/2015. ICCM, Article ID 2204-2.
Open this publication in new window or tab >>Effect of extreme temperatures on micro-damage development in CF/polyimide laminates
2015 (English)In: 20th International Conference on Composite Materials: Copenhagen, 19-24th July 2015, ICCM , 2015, article id 2204-2Conference paper, Published paper (Refereed)
Abstract [en]

CF Thornel® T650 8-harness satin weave fabric composite with thermosetting polyimide NEXIMID® MHT-R resin designed for high service temperatures is produced at around 390°C and therefore high thermal stresses develop after cooling down to room temperature. Thermal transverse stresses in bundles/layers are tensile and lead to multiple intra-bundle /intra-laminar cracking. When the composite plate is subjected to large and repeated temperature variations, new cracks can appear due to thermally induced fatigue stress. Experimental results show that the highest temperature inthe cycle, where thermal stresses are low, has a significant detrimental effect on thermal fatigue resistance. Another observed phenomenon is thermal aging: at high temperature the mechanical properties are degrading with time. Aging and fatigue effects were separately analyzed for quasi-isotropic laminates with lay-up [(+45/-45)/(90/0)]2s.

Place, publisher, year, edition, pages
ICCM, 2015
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-72445 (URN)
Conference
International Conference on Composite Materials : 19/07/2015 - 24/07/2015
Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-04Bibliographically approved
Monti, M., Tsampas, S., Fernberg, P., Blomqvist, P., Cuttica, F., Fina, A. & Camino, G. (2015). Fire reaction of nanoclay-doped PA6 composites reinforced with continuous glass fibers and produced by commingling technique (ed.). Paper presented at . Polymer degradation and stability, 121, 1-10
Open this publication in new window or tab >>Fire reaction of nanoclay-doped PA6 composites reinforced with continuous glass fibers and produced by commingling technique
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2015 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 121, p. 1-10Article in journal (Refereed) Published
Abstract [en]

In this paper, we report the development of a glass fiber commingled composite (GFCC) based on a nanoclay-doped polyamide 6 (PA6) and the evaluation of its fire reaction. The preparation of the composite comprised several steps. Firstly, the nanoclay was dispersed in the PA6 matrix. Then, the produced compound was spun in filaments and commingled with continuous glass fibers. Finally, the laminate preform was consolidated. Reference samples based on the neat PA6 were produced as well. As a results, although it is well known that, in the presence of a relevant amount of continuous fibers, the behavior of the material is mainly driven by the fibers themselves (e.g. mechanical, thermal, conductive, and so on), the effect of the clay was interesting, especially in flammability test (UL94 vertical burning test), where the total burning time passes from 227 s to 146 s.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-10543 (URN)10.1016/j.polymdegradstab.2015.08.006 (DOI)000365057700001 ()2-s2.0-84939797869 (Scopus ID)95cc6e73-ccf0-4153-85e4-2d7837b83494 (Local ID)95cc6e73-ccf0-4153-85e4-2d7837b83494 (Archive number)95cc6e73-ccf0-4153-85e4-2d7837b83494 (OAI)
Note
Validerad; 2015; Nivå 2; 20150813 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Fernberg, S. P., Joffe, R., Tsampas, S. & Mannberg, P. (2015). Influence of post-cure on carbon fibre polyimide composites with glass transition temperatures above 400ºC (ed.). In: (Ed.), : . Paper presented at International Conference on Composite Materials : 19/07/2015 - 24/07/2015.
Open this publication in new window or tab >>Influence of post-cure on carbon fibre polyimide composites with glass transition temperatures above 400ºC
2015 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The current communication present results from work on polymeric composites with extreme temperature performance. We are studying carbon fibre composites based on a new phenyl ethynyl terminated polyimide formulation NEXIMID® MHT-R (Nexam Chemicals AB, Sweden) based on hexafluoroisopropylidene bisphthalic dianhydride (6-FDA), 4-(Phenylethynyl)Phthalic Anhydride (4-PEPA) and ethynyl bis-phthalic anhydride (EBPA). This study in particular investigates how post-cure conditions such as time, temperature and atmosphere influence Tg of the composites. In addition to this we also trace and analyse the consequences of post-cure on weight loss and occurrence of micro-cracks. We are considering three different post-curing temperatures: 400°C, 420°C and 440°C in the study. Two different atmospheres, air and inert by nitrogen, were also investigated. In summary the results reveal that remarkably high Tg, up to around 460°C, is achieved with only very limited weight loss. It was also observed that some, but limited amounts of, micro-cracks are developed within the laminates due to the inevitable high thermal stresses generated upon cooling from cure temperature.

Keywords
curing, glass transition temperature, cure induced cracking, Polyimide, Materials science - Construction materials, Teknisk materialvetenskap - Konstruktionsmaterial
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-37908 (URN)c194b6d5-aa27-4566-b750-7a740183db3e (Local ID)c194b6d5-aa27-4566-b750-7a740183db3e (Archive number)c194b6d5-aa27-4566-b750-7a740183db3e (OAI)
Conference
International Conference on Composite Materials : 19/07/2015 - 24/07/2015
Note

Godkänd; 2015; 20150818 (joffe)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5948-7525

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