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Instruments / Technical Area	Publication Details	Published	Actions
B16-Test Beamline	In situ X-ray diffraction and thermal simulation of material extrusion additive manufacturing of polymer Weiguang Wang , Yanhao Hou , Jiong Yang , Zhengyu Yan , Fengyuan Liu , Cian Vyas , Wajira Mirihanage , Paulo Bartolo Materials & Design 245 DOI: 10.1016/j.matdes.2024.113255 Diamond Proposal Number(s): [14099] Open Access Show Abstract ▼ Abstract: Material extrusion additive manufacturing (AM) has gradually become a dominant technology for the fabrication of complex-designed thermoplastic polymers that require a higher level of control over the morphological and mechanical properties. The polymer internal crystal structure formed during the AM process can present significant impacts on the mechanical properties of the individual filaments, as well as the whole structure. Currently, limited details are known about the crystal structure evolution during the material extrusion AM processes of polymers. A novel in situ synchrotron X-ray diffraction (XRD) experimental configuration was developed enabling us to capture the material evolution data throughout the extrusion AM process. The in situ time-resolved data was analysed to reveal nucleation and crystallization sequences during the continuous deposition, with the aid of both complimentary numerical simulations and post-process (ex situ) characterisations. The thermal simulations supported the prediction of the filament temperature profile over time and location during the AM process, while ex situ characterisations validated the correlation between polymer crystallinity (resulting from printing parameters) and corresponding mechanical properties. The results obtained from varied process parameters suggest that the processing temperature has a dominant influence on the crystal microstructure evolution compared to the deposition velocity. A lower processing temperature just above the melting temperature permitted favourable crystallization conditions. The overall analysis demonstrated prospects for enhancing polymer AM, to engineering mechanically hierarchical structures through correlative investigations.	Sep 2024

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B16-Test Beamline

In situ X-ray diffraction and thermal simulation of material extrusion additive manufacturing of polymer

Weiguang Wang , Yanhao Hou , Jiong Yang , Zhengyu Yan , Fengyuan Liu , Cian Vyas , Wajira Mirihanage , Paulo Bartolo

Materials & Design 245

DOI: 10.1016/j.matdes.2024.113255

Diamond Proposal Number(s): [14099]