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  • 1.
    Bäckman, Tobias
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Utredning om konstruktion och beräkning för additiv tillverkning - Markforged2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The following thesis work was performed by Tobias Bäckman between 2018-01-15 – 2018-06-01 on behalf of Deva Mecaneyes. Deva Mecaneyes had identified a need and a possible application area for additive manufacturing based on the Markforged Mark Two 3D-printer which they had purchased. However, many question marks remained regarding how the materials from the printer would behave. How to design against this manufacturing method and which applications that could be beneficial for the company.

    At the start of the project it was identified that Deva Mecaneyes main limitations for not implementing 3D-manufacturing more extensive in their product development process was partly the lack of experience of additive manufacturing methods but mainly due to the lack of reliable material data for the printed parts. Based on this, three research questions were formulated. These research questions discuss how to replace traditional manufacturing methods, which material relationships are possible to identify, and which factors should be considered when designing against additive manufacturing.

    The bulk of the work thus consisted of producing material data for materials that are compatible with Markforged mark Two. This was done based on ASTM standards that treat tensile tests, bending tests and fatigue tests.

    Two already existing products from Deva Mecaneyes in the field of lifting gear for manufacturing industries were selected with the purpose to redesign these products to be manufactured with the Mark Two 3D-printer instead. In this way, an alternative way for these applications could be showed by replacing the traditional manufacturing methods with additive manufacturing methods. The reconstructed lifting gear was also manufactured to be verified against the produced material data but also to demonstrate improvement or deterioration against the existing lifting gear.

    The measurable goals for the project were to prove cost and time reduction by at least 50% by replacing the traditional manufacturing methods with additive manufacturing methods while maintaining the same reliability. The result demonstrated two redesigned lifting gears with many improvement areas. A great result that stood out was a cost reduction of approximately 80% and 90% respectively.

    Several material relationships have been identified during the work and new experiences regarding printed details have arisen. The author believes that the work, with addition to the accomplished goals, has laid a good ground to begin to understand the materials more and more and thus a good beginning to obtaining a reability from 3D-printed details. Which is a decisive factor to begin replacing the traditional manufacturing methods.

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    Utredning om konstruktion och beräkning för additiv tillverkning - Markforged
  • 2.
    Veronica, Berggren
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Malin, Gunnarsson
    Mälardalen University, School of Innovation, Design and Engineering.
    En analys av vilka utmaningar som finns för kompositmaterial inom flygindustrin2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Within the aircraft industry composite becomes more common, especially on primary structures. The purpose of this thesis has been to get a picture of the problems and challenges that exist today related to composite. This report has a maintenance perspective and an analyse have been done to find problems and challenges that the use of composite can result in. Advantages and disadvantages between aluminium alloys and composite have been investigated as well as a general comparison. Interviews have been performed with people of knowledge within the airline industry to find out the challenges and problems connected to particularly composite. Qualitative and open questions have been used in the interviews, the people who were interviewed had an opportunity to tell their own perspective. In addition to interviews a collection of information about aluminium alloys and composite have been done in articles, handbooks and web pages. As a result of the interviews and the gathering of facts, the problem formulation has been answered. The benefits with composite are shown to be a saving in weight, less corrosion and less demanding maintenance. On the other hand, there are disadvantages like harder to inspect, more expensive material and it require different skills compared to aluminium. At the same time, there are challenges like the repair of damage, more demanding of resources when repairing and difficulties with planning. Future challenges for composite is among other things to identify damages, this is something that is already a problem today. At the same time, it looks like the technical development is going forward to meet the problems that are with composite. This thesis has only observed the perspective of the civil aircraft, the perspective of the military and the private sector have not been investigated. The people who have been interviewed are engineers and technicians, aircraft manufacturers or people high up in the airline who makes decisions have not been contacted. I the future there may be a combination of new aluminium alloys and composite on the aircraft to optimize the construction. 

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    En analys av vilka utmaningar som finns för kompositmaterial inom flygindustrin
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