Abstract
The use of composites in structural applications requires the study of specific properties to ensure that these materials are safe and an excellent option to replace some metals, for example. In the present study, vacuum assisted resin transfer molding (VARTM) was used prior to obtain carbon/epoxy non-crimp fabric composites. Dynamic mechanical analysis and creep - by using Findley and Burger's methods - tests were performed aiming to evaluate the viscoelastic properties of the composites, in three different temperatures (30, 60 and 90°C) and static stresses (2, 5 and 10 MPa). The viscoelastic properties were also discussed using Weibull parameters obtained from creep curves. In general, the deformation was temperature and stress dependent, which was corroborated by the viscoelastic parameters obtained from both models.
Highlights
Carbon/epoxy composites are lightweight materials with high specific properties, such as strength and stiffness
Goertzen and Kessler[12] evaluated creep behavior of carbon/epoxy composites under tensile and flexural loadings and the results suggested that the composite would not fail below 65% of the tensile strength for 1,600h
Fabrics were arranged in 16 layers in a quadraxial architecture of [(0, 90, ±45)S]2.The fiber volume content in each composite was 60±1% and the void content was 3.4±0.3%,both determined by acid digestion (ASTM D3171-15)
Summary
Carbon/epoxy composites are lightweight materials with high specific properties, such as strength and stiffness. Since the main characteristics of VARTM and resin film infusion (RFI) are identical, one of the main differences is that in VARTM the thickness is controlled by the mold tooling cavity, while in the infusion process a part with a thickness is controlled by the fibers' compaction under vacuum. Another important difference is that in RFI process, resin must be storage under low temperature (to maintain solid format) prior to use[6]
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