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Advisor(s)
Abstract(s)
In composite production, during the thermal drying cycle (T<100ºC), size variation of the
composite material occurs due to thermal expansion and water elimination. However,
when incorporating PLA components, produced by additive manufacturing, into the
abrasive composite, the dimensional variation of the set is very large due to the higher
polymer thermal expansion. During this stage, this composite, still in the green state, could
not have the sufficient mechanical strength to withstand dimensional variations. These can
result in crack formation. Therefore, the proper thermal cycle is a critical step. To define
the convenient heating rate during the drying of composites with a PLA piece,
thermomechanical analyzes were conducted. Three different heating ramps were tested,
0.1, 0.5, and 2.0 ºC/min in the most critical phase of dimensional change (up to 60 ºC),
after this temperature the heating continues at 2 ºC/min. The results indicate that the
slower the heating rate, the higher the absorption of the polymer's expansion by the
composite. In the slower heating rate (0.1 ºC/min) it was possible to minimize the
dimensional variation of the samples by more than 94%.
Description
Keywords
Composite production Research Subject Categories::FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING::Soil science
Citation
Costa, Sharlane; Marques, F.D.P.; Pereira, M.; Ribeiro, J.E.; Soares, D. (2022). Control of the dimensional variation adjusting the thermal drying cycle of abrasive composites with incorporated PLA. In João Rocha; João Eduardo Ribeiro; Jorge Santos; Rui A. Lima (Eds.) 1st International Congress on Additive Manufacturing. Bragança
Publisher
Instituto Politécnico de Bragança