In this study, rectangular beams were fabricated by 3D printed continuous carbon fiber reinforced polylactic acid. The effects of deposited space and layer thickness on bending performance are investigated, and the failure modes are analyzed accordingly. At the same time, the acoustic emission technology was applied to test the damage process to facilitate a more in-depth study compared with related studies, and the principal component analysis method and kmeans++ algorithm were applied to analyze the test signal. The results show that the bending strength and modulus of the printed composites decrease correspondingly with the increase of the layer thickness in the range of layer height of 0.7, 0.8, and 0.9 mm. When the fused deposited space is between 0.6 and 0.8 mm, with the increase of the deposited space, the bending strength and modulus also decrease correspondingly. By using principal component

Fiber-reinforced resin T-beams have a wide range of applications. The forming of T-beams based on the fused deposition process provides a new method for its manufacture. This paper studied the key process parameters of 3D printing continuous fiber and short fiber reinforced resin T-beams. The results show that continuous fiber reinforced resin T-beams with similar fiber volume fractions have better bending performance than shorter fiber reinforced resin Tbeams. When the printing layer thickness is 0.7 mm, 0.8 mm and 0.9 mm, the flexural strength and modulus of the continuous fiber reinforced resin T-beam are obviously lower with the increase of the layer thickness. Under the printing path 0 , ±45 , 90 , the short fiber reinforced resin T-beam with the 0 path has the highest flexural strength and modulus. Furthermore, T-beam with different printing path have significantly different bending failure behavior. The work provided a new approach to the production of beam structures of the actual engineering application.

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