PSI - Issue 53

Carla M. Ferreira et al. / Procedia Structural Integrity 53 (2024) 254–263 Carla M. Ferreira / Structural Integrity Procedia 00 (2019) 000 – 000

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The countries highlighted in yellow, orange, green, light blue and dark blue are in order of deceased number of average citations, respectively. For instance, Singapore, which is addressed to the yellow color, is the most average cited country regarding its scientific publications on the AM of metals in the aeronautical industry, even though it is not one of the most productive countries. On the other hand, the UK follows the lead being the second most cited country while also being the third most productive one. 3.6. Social Structure – Countries Co-Authorship As mentioned previously in section 2.4., the distance between nodes in a bibliometric network indicates the relatedness between them. In Fig. 5, retrieved from the VOSViewer software, it is possible to observe the relatedness of different countries in collaborating with each other for scientific production of AM/L-PBF content in the Aeronautical sector. The size of each node, which in turn represents each country, is associated with the number of published articles, in accordance with Fig. 4.

Fig. 5. Relatedness of different countries in collaborating with each other for scientific production of AM/L-PBF research in the Aeronautical sector. The size of each node is related with the number of published articles by each country while the colour is associated with the average number of citations of each country. The color coding in Fig. 5 is associated with the average number of citations that the set of documents published by a certain country has received. For instance, UK is the fourth largest node in the presented network after USA, China and Germany, in decreasing order, but the yellow color indicates that the average number of citations of UK largely surpasses the ones from the mention countries which are colored in blue. This information is also in agreement with Fig. 4. 3.7. Author Keywords Analysis The bibliometric network now represented in Fig. 6 displays the author keywords (AKs), i.e., the set of terms for scientific literature that each author (or group of authors regarding a publication) selects or creates based on the nature of the publication. These keywords are, in general, considered as paramount elements that summarize and represent the content of the associated scientific publication. The frequency of author keywords can be quantified and used to conduct a co-occurrence analysis to identify scientific intellectual structures, clusters of research, as well as hotspots of different disciplines and subjects investigation [12]. The figure below represents the number of documents in which a certain keyword (AKs) appears. The larger the node, the higher the frequency of each keyword, regarding the collection of documents under study. It is important to mention that some of the keywords involved in the research string, for instance AM or additive manufacturing, were filtered to visually clean the information. As it can be seen from Fig. 6, SLM is currently the most studied process when compared to the other L-PBF technologies, such as SLS, DMLS and DMLS. Three major clusters of research can be identified in Fig. 6 (a). The red cluster, and the biggest one, addresses the mechanical properties and microstructure research fields of metallic materials in the aeronautical sector. Defects,

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