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The fatigue properties of composite materials are degraded seriously in hygrothermal environments, so taking into account their influence is very important when evaluating the fatigue life of composite structures. Tensile fatigue experiments of carbon fiber reinforced resin composite cross-ply laminates were conducted in room temperature/dry (RTD),...
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Carbon fabric reinforced polyetherketoneketone (CFF/PEKK) composites have garnered significant attention from researchers due to their superior properties and have been successfully applied in various engineering fields. Environmental conditions are known to directly influence the mechanical properties and service life of composites; however, limit...
Citations
... Thus, among other contributions, Bergeret et al [1] demonstrated in the context of a glass-fibre-reinforced thermoplastic composite that ageing hygrothermal conditions lead to plastification and chemical degradation effects of the polyamide 66 matrix. Xu et al [2] highlighted that both temperature and moisture contents significantly influence the fatigue properties of carbon fibre cross-ply laminates. Besides, Rafiee et al [3] analysed the combined effect of hygrothermal loads and sustained mechanical loads on the strength of an E-glass/Epoxy composite. ...
This contribution deals with the development of a numerical approach based on discrete element method to study the hygrothermal behaviour of conventional and composite materials. For this purpose, we consider the context of magnesium aluminate and polyamide 6 reinforced with 30% of short glass fibre respectively. A coupled hygrothermal model based on boundary layer theory and the analogy between the Fickian mass and heat transfers is proposed. In addition, the original Halo approach introduced in the context of heat conduction is adapted to determine water concentration gradient fields with a suitable level of description. The proposed model is validated in terms of water concentration and water gradient fields for both materials by comparison with numerical and experimental results through the modelling of drying and absorption processes. Results exhibit the relevance of the proposed approach to provide such information with a suitable level of precision.
At present, there is limited literature available on the fatigue life estimation of glass fiber fabric‐reinforced thermoplastic polymer composites. This study performed constant amplitude fatigue testing to assess the fatigue life of twill‐woven glass fiber‐reinforced thermoplastic composites made from polypropylene (PP) and polyamide (PA) under four different stress levels (70%, 60%, 50%, and 40% of the ultimate tensile strength) with a stress ratio of 0.1. The fatigue life of the specimens was analyzed statistically using two‐parameter and three‐parameter Weibull distribution functions. Linear regression analysis results demonstrates a strong correlation between the independent and dependent variables in the two‐parameter Weibull analysis (correlation coefficient above 0.80), with an even better correlation observed in the three‐parameter analysis (correlation coefficient above 0.94). Based on the parameters derived from the Weibull distribution, the fatigue life of the laminates at varying survival rates has been evaluated. A P‐S‐N fatigue life prediction model has been developed from these results to account for different failure rates. Comparison with the tensile fatigue performance data of fiber‐reinforced polymer composites from the literature indicated that glass fiber‐reinforced thermoplastic composites exhibit excellent fatigue resistance.
Highlights
The fatigue of twill‐weave glass fiber reinforced PA/PP was investigated.
The fatigue life was analyzed using three‐parameter Weibull distribution functions.
A fatigue life prediction model was established based on the Weibull distribution function.
The P‐S‐N fatigue life prediction model provides a reference for material design.
Fibre-reinforced polymeric composites (FRPC), having better corrosion resistance, higher strength-to-weight, and modulus-to-weight ratios, are widely utilised in automotive, wind power, and oil & gas industries, etc. In service, FRPCs are exposed to high temperatures and moisture, causing water absorption, which leads to anisotropic expansion and yields residual stresses affecting the durability of FRPCs. Inevitable water uptake causes swelling, plasticization, matrix hydrolysis, chemical alteration, and fibre/matrix interface debonding, leading to degradation in their mechanical properties. It has been identified that the effect of hygrothermal aging is attributed to various factors such as fabric architecture, polymer matrix, environmental conditions, and manufacturing induced defects. The aim of this paper is to review the effect of hygrothermal aging on the mechanical performance of FRPC, identify the gap in the existing literature, and suggest future direction in this area. In addition to this, various damage prediction models in the hygrothermal environment will be discussed in detail.
