The aim of this research was to determine the influence of the short carbon fibres in nylon PA6 polymer used for fused deposition modelling (additive manufacturing) technology. Specimens from pure PA6 and PA6 with short carbon fibres were fabricated, with both main directions of the material with respect to the build orientation in a 3D printer. Experimental tensile tests of the specimens were carried out at several temperatures according to ISO standards. The strength, tensile modulus and ductility in relation to the temperature were compared. A significant influence of the short carbon fibres on the strength and heat deflection temperature of the part was found in PA6 and also for the orientation of the build in the 3D printer.
The paper deals with the design/optimization of a leaf spring for railway vehicles using composite materials. The optimization was carried out based on the main mechanical parameters of the current design solution for steel leaf springs. A numerical simulation was created to obtain the data, then the simulation was verified using an experimental test. Glass fibre reinforcement with epoxy resin was chosen as the material for the composite leaf spring. The main shape of the composite leaf spring was created using geometrical optimization. An advanced finite element model which modelled individual plies of the laminate was created to check the strength of the composite spring. A maximum stress strength criterion and transverse shear interlaminar criterion were used to evaluate the failure index.
This paper deals with the design of a bellows coupling from composite material. This type of clutch-shaped bellows can be used as an alternative to a conventional universal joint. A numerical strength and stiffness analysis were performed. This analysis included design optimization in terms of the required rigidity and uniformity of stress distribution. The strength was evaluated by using maximum stress strength criterion. This numerical model respects overlays of layers of prepregs and distortion of fibres.
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