TY  - JOUR
T1  - The Effect of Heat Treatment on the Mechanical Properties of Continuously Fibre-Reinforced Standardised Specimens
AU  - Molnár, Balázs
AU  - Magai, Róbert
PY  - 2025
DA  - October
Y2  - 2025
DO  - 10.30939/ijastech..1752437
JF  - International Journal of Automotive Science And Technology
JO  - IJASTECH
PB  - Otomotiv Mühendisleri Derneği
WT  - DergiPark
SN  - 2587-0963
SP  - 22
EP  - 27
VL  - 9
IS  - Special Issue 1st Future of Vehicles: Innovation, Engineering and Economic Conference
LA  - en
AB  - This study investigates the influence of post-printing heat treatments on the mechanical characteristics of 3D-printed specimens strengthened with continuous Kevlar filaments. After their fabrication, the specimens underwent thermal annealing at temperatures of 100 °C and 150 °C for either 1 or 3 hours. To assess the effects of these treatments on mechanical performance, tensile tests and microscopic analyses were performed. The findings indicated that the most significant enhancement was observed in specimens annealed at 150 °C for 1 hour, which resulted in an approximately 20% increase in tensile strength compared to untreated samples. Heat treatments at 100 °C for 1 hour and 3 hours led to moderate improvements of 5–8%, whereas extended treatment at 150 °C for 3 hours resulted in a reduction of about 10% in tensile strength. Microscopy revealed that brief, high-temperature treatment enhanced interlayer bonding and decreased internal stress without harming the structure, while prolonged thermal exposure led to local delamination and compromised fibre–matrix adhesion. These results suggest that controlled post-printing heat treatment can enhance the mechanical properties of continuous fibre-reinforced composites, though excessive heat exposure can lead to degradation. Therefore, careful optimisation of temperature and duration is crucial. The outcomes offer valuable insights for improving the structural performance of additively manufactured continuous fibre-reinforced components.
KW  - Additive manufacturing
KW  - Continouos fiber 3D printing
KW  - Heat treatment
KW  - Microstructural analysis
KW  - Tensile
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UR  - https://doi.org/10.30939/ijastech..1752437
L1  - https://dergipark.org.tr/en/download/article-file/5097242
ER  -