Abstract
This study investigates the influence of the adhesive (epoxy resin) thickness and the dispersions of non-functionalized carbon based nanostructures (carbon nanotubes - CNT) on mechanical properties of single-lap bonded joints. To achieve this goal, three CNT concentrations (0.5%, 1.0% and 2.0% m/m); and three different bondline thicknesses (0.05 mm, 0.15 mm and 0.40 mm) were evaluated. The mechanical properties were measured using the apparent shear tensile test, based on ASTM D5868. The results showed that the addition of 1.0 wt% CNTs improved the interface strength, leading to an increase on delaminated areas in failure region up to 55.36% and also improving the peak force up to 13.85%. Decrease in adhesive thickness from 0.40 mm to 0.05 mm promoted a stress redistribution inside adhesive layer improving the peak force up to 13.91%. CNT seems to promote changes in failure modes, light fiber tear (LFT) failure significantly increases up to 45.96%, indicating that interface strength between adhesive and adherent was improved.
Highlights
In recent years, the application of composite materials has been growing in many sectors of industry: civil engineering, aerospace, naval and automotive
This value was increase up to 77.89% for samples with 0.5 wt% CNT, 95.89% for samples with 1.0 wt% CNT and 92.23% for samples with 2.0 wt. % CNT. It was observed an increase in load capacity up to 13.85% for group with 1.0 wt. % CNT, compared against group with pure epoxy adhesive
The results showed that the CNT dispersion improved the interface strength leading to an increase
Summary
The application of composite materials has been growing in many sectors of industry: civil engineering, aerospace, naval and automotive. Tamblin et al.[6] studied several bondline thicknesses varying from 0.4 mm to 3 mm, using three types of adherents: Aluminum Alloy (2024-T3), carbon fabrics and glass fiber fabrics They observed a decrease in the values of the peak shear stress with the increase of the adhesive thickness. Ashrafi et al.[26] performed impact and compression-after-impact (CAI), Mode I and Mode II Interlaminar fracture toughness tests in modified epoxy resin filled with different quantities of functionalized single-wall nanotubes. They found that addition of 0.1 wt. This study investigates the influence of the adhesive thickness and the dispersions of carbon based nanostructures (carbon nanotubes-CNT) on mechanical properties of singlelap bonded joints.
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