Desenvolvimento e análise de adesivos nanomoficados por nanotubos de carbono

• Ano de defesa: 2016
• Autor(a) principal: Elvis Carneiro Monteiro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Nanotubos de Carbono; Juntas coladas; Materiais Compósitos; Polímeros; Espessura do Adesivo; Engenharia mecânica
• Link de acesso: http://hdl.handle.net/1843/BUBD-AC3LBU

This study investigates the influence of the adhesive thickness and the dispersions of nanostruc-tures on mechanical properties of bonded joints using epoxy adhesive. To achieve this goal, three nanotube concentrations: 0.5%, 1.0% and 2.0% by weight; and three different thicknesses: 0.05 mm, 0.15 mm and 0.4 mm were evaluated. The mechanical properties were measured using the apparent shear tensile test, based on ASTM D5868. The results showed a significant changein failure mode observed in the broken joints. Apparently the addition of nanotubes promoted the creation of a stronger interface, as evidenced by the increase in the intensity of the damage observed in the failure regions. Failure migrated from a mixed form of adhesive failure and LFTfor a purely LFT type with high degree of damage on the adhered fibers, as can be seen in the groups that received 1.0% and 2.0% carbon nanotubes. The reduction in thickness influence the load capacity, causing an increase up to 57.12% in final strength of the joint, this fact was already expected. However, the addition of nanotubes promoted an increase on adhesive stiffness and influenced on failure modes. Variations in failure modes caused by the addition of carbonnanotubes promoted an increase in the load capacity up to 11%.