Abstract
The present paper is concerning to an empirical analysis of tensile properties of plies and laminates formed with an epoxy matrix and with various carbon fiber fabrics. The analysis was started with the aim of finding some correlations between the elastic parameters of plies and elastic parameters of laminates when fabrics are used as reinforcements. Six different carbon fiber fabrics were used to analyze the plies and laminates mechanical parameters. The epoxy system Epiphen RE-4020-DE4020 was used in both cases as matrix. The mechanical response to tensile test was analyzed for above mentioned materials and the results had been compared with values obtained by application of various purposed models.
Highlights
The present paper is concerning to an empirical analysis of tensile properties of plies and laminates formed with an epoxy matrix and with various carbon fiber fabrics
As it can be seen in figure 3 and figure 4 there are some differences between the aspects of the failure zone especially in the case of inclined loadings - the images in figure 4 refer to the two fabrics with the same specific weight (CF160 and TF160) meaning that they have the same number of filaments on the length unit
What is to be noticed is that the two fabrics were selected just for their common feature but, following the visual inspection, the conclusion is that all the regular fabrics present some short whiskers on the two sides of fractures while the fabrics obtained from spread yarns have smooth edges of fractures
Summary
First approaches regarding the mechanical response of fabric reinforced polymer composites were taking into account the waviness of fabrics as a parameter to describe the lowered values of elastic parameters or the hypothesis that a fabric might be described as a superposition of two orthotropic plies rotated at 90° and with some geometric corrections [16-19]. Last approaches are using the observation that, generally, when a fabric reinforced laminate is formed there appears differences between the ply thickness and laminate thickness namely the thickness of the laminate is lower than the ply thickness multiplied by number of plies This effect is denoted as nesting effect in latest studies [20-24] and represents, a displacement of adjacent reinforcement layers such as each one will occupy the relief of the other leading to unexpected mechanical behavior at micro-level with averaged macro-level effects. There are many differences between forming techniques depending on the type of the polymer and there exist studies regarding the final properties of fabric reinforced thermoplastics but in the case of usual resins the number of studies is low
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