| Summary: | We investigated the effect of nozzle temperature on the transverse tensile strength of continuous carbon fiber/polyphenylene sulfide (PPS) composites fabricated using fused deposition modeling 3D printers. In particular, we aimed at clarifying the parameters inside the material that would better represent the strength in the thickness direction. First, the nozzle temperature was varied and the printed crystallinity, void fraction and interlaminar strength were measured. High strength was observed at both ends of the printable temperature whereas a minimum was observed at the intermediate temperature. Although the relationship between the strength, crystallinity, and void fraction was obtained, no clear trend was observed. The filament bundle deformation due to melting was focused on by observing the entire cross-section, and the extent of the deformation was quantified by defining the filament area fraction. The same trends between the strength and filament area fraction were obtained for the temperature change. In addition, the mechanism underlying the change in the filament area fraction with increasing nozzle temperature was explained.
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