Naslov
Parametric optimization of intra- and inter- layer strengths inparts produced by extrusion- based additive manufacturing ofpoly(lactic acid)

Autori
Spoerk, Martin ; Arbeiter, Florian ; Cajner, Hrvoje ; Sapkota, Janak ; Holzer, Clemens

Izvornik
Journal of applied polymer science (0021-8995) 134 (2017), 41; 45401-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
extrusion ; mechanical properties ; microscopy ; structure–property relationships ; thermoplastics

Sažetak
Parts produced by extrusion-based additive manufacturing experience the disadvantage of consisting of many weld-lines, which consequently downgrade their mechanical properties. This work aims at maximizing the strength of printed parts by consider-ing and improving the intra- and inter-layer cohesion between adjacent strands. Therefore, printed poly(lactic acid) specimens werecharacterized by means of a particular tensile test setup, and the inter-layer cohesion of printed specimens was evaluated by means ofthe double cantilever beam test. A detailed parametric statistical evaluation, which included printing temperatures, layer thicknesses, and layer- designs, was complemented by the material’s viscosity data and the analysis of the specimens’ fracture surfaces and cross- sections. An optimal layer-design was found to be a key parameter in the optimization of strength with regard to different loadingdirections. Additionally, the maximization of the cohesion leads to a tremendous improvement in the mechanical performance of theprinted parts, resulting in strengths of roughly 90% of those of compression-molded parts.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA