Tensile and fatigue failure of 3D printed parts with continuous fibre reinforcement

Abstract

This paper introduces a design methodology used to integrate continuous fibre reinforcement into AM polymer parts with the aim of improving their mechanical properties. Tensile and low cycle fatigue testing of reinforced parts is carried out for a range of load conditions and strain rates Physical testing showed that it was possible to improve the strength of parts by 400% and cycles to failure by 42,800% with the addition of 4% carbon by weight. Logarithmic load/cycle relationships were found also samples showed significant variability in the number of cycles to failure. No correlation between the density of the polylactic acid (PLA) infill and the tensile strength or low cycle fatigue life.Access holes used to thread the fibre into the reinforcement channels were identified as stress concentrators initiating cracks in the PLA and separation of the reinforcement from the PLA part.

Fused Filament Fabrication of Polymers and Continuous Fiber-Reinforced Polymer Composites: Advances in Structure Optimization and Health Monitoring

“…It has been shown that printed parts obtained with this method generally present less porosity than the previous process. However, potential limitations can be anticipated due in part to both the design and poor infiltration of the fiber in the polymer [ 2 , 105 ].…”

Compression and Bending Properties of Short Carbon Fiber Reinforced Polymers Sandwich Structures Produced via Fused Filament Fabrication Process

“…Defects specific to the FFF process (high void content, poor interlayer bonding, and inhomogeneous fibers distribution) have a significant impact on the strength to interlaminar shear and on the breaking behavior of 3D-printed specimens [ 23 , 24 , 25 , 26 , 27 ]. However, researchers have studied and significantly improved the mechanical performance of composites reinforced with continuous fibers, using various types of tests as compression [ 28 , 29 ], tensile [ 30 , 31 , 32 ], bending [ 33 , 34 , 35 ], fatigue [ 36 , 37 ], and impact [ 38 , 39 ].…”

Optimisation of free vibration analysis on structural plates of fibre reinforced laminated composites

“…Londhe et al (2016) presented the effect of coatings on Jute/epoxy which reduces its moisture absorption. In additive manufacturing, the mechanical properties are improved by introducing a design methodology which was discussed by Brooks et al (2017) in integrate continuous fibre reinforcement in polymer parts. Sushmita et al (2016) investigated experimental free and forced vibration of hybrid composite plates.…”