Estudo de compósitos de estrutura sanduíche utilizando sisal–epóxi e núcleo honeycomb a base de petg e pla feito em impressora 3d.

Abstract

Polymeric matrix compounds have been widely used in several industries, thanks to the advantages offered by polymers, such as ease of processing, low cost, high productivity and versatility. Among the most common applications are aerospace, automotive, military, civil construction and the production of sports equipment. Additive manufacturing, through 3D FDM printing, is a technique that enables the creation of parts at low cost, design freedom and faster prototyping cycles, being widely used in engineering and showing strong growth in the coming years. Sisal is a plant that was designed in Bahia, more specifically in the municipality of Santaluz, in 1910, but it only started to be commercially exploited from the 1930s onwards. socioeconomic importance, generating employment and income for approximately 700,000 family farmers, in addition to jobs in other stages of the chain, usually in urban centers. Sandwich panels are used to withstand normal tensile emotions, stresses and shear associated with bending, and the choice of faces that make up the panel is directly influenced by the number and inspiration of the overlaps. The core of the panel, in turn, must keep the faces apart and be rigid perpendicularly to them. Bend tests tolerated that sandwich composites perform better with PETG, a type of polymer stronger than PLA, used in 3D printing, although composites with PLA are lighter due to the lower core density. Flexural tests showed that composite sandwiches performed better with PETG. In all tests PETG was more resistant, generally speaking 21% to 32% more resistant than PLA. Although there was no rupture in the specimens, the cores in PETG deformed from 0.5% to 3.6% less than the PLA. The PLA composites were lighter, due to the core density being 13.8% lower than the PETG cores.