Evaluation of weather influence on mechanical and viscoelastic properties of polyetherimide/carbon fiber composites

Abstract

In order to investigate how environmental degradation affects the mechanical and thermal performance of polyetherimide/carbon fiber laminates, in this work different weathering were conducted. Additionally, dynamic mechanical analysis, interlaminar shear strength tests and non-destructive inspections were performed on this composite before and after being submitted to hygrothermal, UV radiation and thermal shock weathering. According to our results, hygrothermally aged samples had their glass transition temperature and elastic and storage moduli reduced by plasticization effect. Photooxidation, due to UV radiation exposure, occurred only on the surface of the laminates. Thermal shock induced a reversible stress on the composite’s interface region. The results revealed that the mechanical behavior can vary during weather exposure but since this variation is only subtle, this thermoplastic laminate can be considered for high-performance applications, such as aerospace.

Dynamic mechanical property and interlaminar shear strength of the carbon fabric reinforced polyetherimide composite based on the polyetherimide resin films

“…Composite materials with poor interfacial bonding usually tend to dissipate more energy . The stronger interfacial adhesion between the fiber and the resin in the composite can result in lower loss modulus peak value because of dissipating less energy during the periodic oscillation by DMA.…”

Anti‐symmetrical curved composite laminate subject to delamination induced by thermal cycling

“…A uniform temperature variation was applied to the whole model through the Predefined Field option. Two models were developed for each crack length in which each one has two temperature conditions, according to Eqs (4) and (5).…”

“…Composite material performance depends on the interface between matrix and fiber that is constantly changing when exposed to moisture and temperature. Moisture diffusion, for instance, is activated by increasing the temperature . Therefore, the utilization of such materials in hot/wet environment can change the mechanical behavior in the matrix domain, and, consequently, may require further assessment in the realistic conditions …”

“…Moisture diffusion, for instance, is activated by increasing the temperature. [4][5][6] Therefore, the utilization of such materials in hot/wet environment can change the mechanical behavior in the matrix domain, and, consequently, may require further assessment in the realistic conditions. 4,7 The effect of thermal variation in composite laminates is considered deleterious at the interface because of differences in coefficient of thermal expansion (CTE) of fiber and matrix.…”

Lightweight structural composites with electromagnetic applications

“…Several studies have shown the important effects of absorbed water and temperature in the ageing of the physical and mechanical properties of composite materials [4,5]. Several studies have shown the important effects of absorbed water and temperature in the ageing of the physical and mechanical properties of composite materials [4,5].…”