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Advances in Materials Science and Engineering
Volume 2016, Article ID 5780693, 8 pages
Research Article

Processing and Quality Evaluation of Additive Manufacturing Monolayer Specimens

1Mechanical Engineering and Industrial Design Department, University of Cadiz, Faculty of Engineering, Avenida de la Universidad de Cadiz, No. 10, Puerto Real, 11519 Cadiz, Spain
2Department of Automotive and Aeronautical Engineering, University of Applied Sciences Hamburg, Faculty of Engineering and Computer Science, Berliner Tor 21, 20099 Hamburg, Germany

Received 19 January 2016; Revised 31 March 2016; Accepted 20 April 2016

Academic Editor: Ying Li

Copyright © 2016 Christiane Wendt et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Although its importance has increased significantly, Additive Manufacturing is not yet a fully accepted industrial manufacturing process for load-carrying parts. The future success of the process group depends on its standardization. This work proposes a methodology for the design, manufacturing, and quality evaluation of specimens manufactured by Fused Layer Modeling that are composed of only one layer (so-called monolayers). The processing methodology and properties of monolayers have not been studied systematically yet. A first systematic design of monolayers for mechanical testing is presented. Rectangular and circular monolayers adapted to the loads of tensile and compression testing are manufactured using different trajectory strategies. Frequently occurring macro- and microgeometrical defects are evaluated and categorized in order to optimize the part quality. This work also studies the effect of some manufacturing parameters such as the gap between print head and machine bed, trajectory strategy, bed leveling, and temperatures on part quality. The most suitable specimens are tested mechanically in tensile or compression tests. In the case of study, tensile strength values are only 8.6% lower than the values for reference tests on the unextruded filament. However, the properties deviate more strongly for compression tests which may be due to the selected specimen geometry.