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Dual-energy computed tomography investigation of additive manufacturing aluminium: carbon-fibre composite joints
Örebro University, School of Science and Technology.ORCID iD: 0000-0002-9362-8328
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-1408-2249
2019 (English)In: Heliyon, ISSN 2405-8440, Vol. 5, no 2, article id e01200Article in journal (Refereed) Published
Abstract [en]

In this work, aluminium–carbon-fibre reinforced plastic joints have been studied. Three types of samples were designed as double lap joints where the aluminium inserts were fabricated using both classical methods (milling) and additive manufacturing. Two versions of the joint were fabricated using additive manufacturing, one flat, and the other with small teeth designed to hook into the carbon-fibre plies. The joints were characterised using a non-linear, dual-energy computed tomography method to evaluate the bond between the composite and the metal inserts. The mechanical strength of the bonds was evaluated, both through tensile tests and four-point bending. A simple finite element model was used to discuss the joints behaviour. It was found that the joints fabricated using additive manufactured inserts were more resistant to peel stress than the milled inserts. In four-point bending tests the moment that the joint could withstand was increased by roughly 300% with the use of additive manufacturing and 400% with the use of additive manufacturing and small teeth. However, in tensile tests it was found that the teeth design reduced the maximum load capacity of the joints by roughly 30% due to porosity. Further, it was found that the additive manufactured samples did not add to the capability of withstanding shearstress. The information gained with the dual-energy computed tomography method was highly valuable as the behaviour of the joints would have been difficult to explain without the porosity information.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 5, no 2, article id e01200
Keywords [en]
Mechanical engineering, Materials science
National Category
Mechanical Engineering
Research subject
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-72142DOI: 10.1016/j.heliyon.2019.e01200ISI: 000460082200023PubMedID: 30839940Scopus ID: 2-s2.0-85061013958OAI: oai:DiVA.org:oru-72142DiVA, id: diva2:1286002
Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-06-19Bibliographically approved
In thesis
1. More Than a Shadow: Computed Tomography Method Development and Applications Concerning Complex Material Systems
Open this publication in new window or tab >>More Than a Shadow: Computed Tomography Method Development and Applications Concerning Complex Material Systems
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The complexity of the components fabricated in today's industry is ever increasing. This is partly due to market pressure, but it is also a result from recent progress in fabrication technologies that open up new design possibilities. The increased use of additive manufacturing and multi-material systems, especially, has driven the complexity of parts to new heights. The new complex material systems bring benets in many areas such as; mechanical properties, weight reduction, and multifunctions. However, the increased complexity also makes inspection and dimensional control more dicult. In additive manufacturing, for example, internal features can be fabricated which cannot be seen or measured with conventional tools. There is thus a need for non-destructive inspection methods that can measure these geometries. Such a method is X-ray computed tomography. Computed tomography utilizes the X-rays ability to penetrate material to create 3D digital volumes of components. Measurements and material investigations can be performed in these volumes without any damage to the investigated component. However, industrial computed tomography is still not a fully mature method and there are many uncertainties associated with the investigation technique. In this work, a dual-energy computed tomography tool has been developed with the aim to increase the performance of computed tomography when investigating complex geometries and material combinations. This method has been applied to various phantoms and an industrial case. Also, in this work, complex lattice structures fabricated with additive manufacturing have been investigated and analysed using computed tomography. The results show that the new DECT method improves measurement results and can be utilized to inspect multi-material components. The results also show that computed tomography can be used successfully to gain knowledge about complex lattices.

Place, publisher, year, edition, pages
Örebro: Örebro University, 2019. p. 139
Series
Örebro Studies in Technology, ISSN 1650-8580 ; 84
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-73739 (URN)978-91-7529-286-1 (ISBN)
Public defence
2019-06-12, Örebro universitet, Teknikhuset, Hörsal T, Fakultetsgatan 1, Örebro, 13:15 (English)
Opponent
Supervisors
Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-06-13Bibliographically approved

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Jansson, AntonPejryd, Lars

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