Abstract
The present work studied the effects of hygrothermal aging on the flexure behaviors of 3D printed composites reinforced with continuous glass fibers. Composites filled with different stacking sequence of continuous glass fiber layers were prepared. Printed laminated composites were subjected to the hygrothermal environment for up to 30 days. Moisture absorption processes and the corresponded microstructure changes were monitored along with the flexural responses of specimens. Multi-scale morphological investigation was applied to reveal the underlying deformation and failure mechanisms of the specimens under flexion with the consideration of different staking sequence of continuous glass fiber layers. The results showed that the evolution of mechanical properties induced by hygrothermal aging was influenced by the competition of different mechanisms. Polyamide matrix crystallization and the elimination of partial residual stress provided the strengthening effect, while the loss of intralayer and interlayer bonding as well as breakage of glass fiber and matrix weakened the mechanical properties of printed composites. The flexural behaviors of composites with separated distribution of continuous glass fiber layers exhibited higher hygrothermal stability in the early stage of aging. However, this advantage weakened with increasing aging time due to gradual delamination between glass fiber layer and matrix layer.
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