The influences of laminated structure on the ablation characteristics of carbon fiber composites under CW laser irradiation

et al. 2023

Polymer Composites

3D printing of continuous fiber reinforce plastics (CCFRP) with fused deposition modeling is a burgeoning manufacturing method because of its exceptional mechanical properties. Nevertheless, it cannot manufacture parts at high speeds. Using laser heating instead of the traditional resistive heating in 3D printing of CCFRP has the potential to improve printing speed owing to its high heating efficiency. In this article, a process of laser-assisted rapid 3D printing of CCFRP is proposed. The heating process of CCFRP by laser is analyzed and verified. The linear relation between printing speed and laser power is established. The experiments demonstrate that the printing speed is increased to 30 mm/s with the laser. The mechanical properties of printed parts, though enhanced as the printing speed and laser power increase, are better than those obtained by traditional methods. Scanning electron microscope images and experiments reveal that proper laser power is conducive to the melting of plastics, strengthening interlayer bonding, and reducing voids under roller pressure. Nonetheless, excessive laser power ablates the plastic, resulting in increased voids.

Section: Specimen Configuration and Printing Conditionsmentioning

confidence: 99%

Laser assisted rapid 3D printing of continuous carbon fiber reinforced plastics: Simulation, characterization, and properties

Tan

et al. 2023

Polymer Composites

“…Based on the bridging theory, Liu et al [13] proposed a multiscale progressive damage model of carbon/epoxy composites under laser mechanical coupling, which can effectively predict the failure load of laminates. Nan et al [14] studied the ablation process of composite laminates under CW laser irradiation through tests and simulations. They found that the difference in thermal conductivity of material components and the layup scheme of laminates have a great effect on the ablation morphology.…”

Section: Introductionmentioning

confidence: 99%

Laser Ablation Mechanism and Performance of Carbon Fiber-Reinforced Poly Aryl Ether Ketone (PAEK) Composites

Jiang

et al. 2022

Polymers

The ablation mechanism and performance of carbon fiber (CF)-reinforced poly aryl ether ketone (PAEK) thermoplastic composites were studied in this paper. The results show that the ablation damaged area is controlled by the irradiation energy, while the mass loss rate is controlled by the irradiation power density. In the ablation center, the PAEK resin and CFs underwent decomposition and sublimation in an anaerobic environment. In the transition zone, the resin experienced decomposition and remelting in an aerobic environment, and massive char leaves were present in the cross section. In the heat-affected zone, only remelting of the resin was observed. The fusion and decomposition of the resin caused delamination and pores in the composites. Moreover, oxygen appeared crucial to the ablation morphology of CFs. In an aerobic environment, a regular cross section formed, while in an anaerobic environment, a cortex–core structure formed. The cortex–core structure of CF inside the ablation pit was caused by the inhomogeneity of fibers along the radial direction and the residual carbon layer generated by resin decomposition in an anoxic environment. The description of the ablation mechanism presented in this study broadens our understanding of damage evolution in thermoplastic composites subjected to high-energy CW laser irradiation.

Section: Introductionmentioning

confidence: 99%

“…There have been many studies on CFRP under laser irradiation, involving the influence of layer structure [2,3] , tangential airflow [4,5] and thermal stress [6,7] . And there are also simulation calculations about interlayer crack formation [2,3,8] . It has been proved that the peak power density and pulse width of multiple laser are the reasons for the ablation of the matrix and carbon fiber, while increasing the repetition rate and irradiation time can only expand the ablation area of the matrix [9,10] .…”

Section: Introductionmentioning

confidence: 99%

Fracture of carbon fiber composite strip under preloading and CW laser irradiation

Sixth International Symposium on Laser Interaction With Matter

Pan²,

Shen³

et al. 2022

Carbon fiber composite has been widely used in structural engineering applications, and research on the mechanical properties under various conditions is attractive. The study experimentally investigated the damage effect of CW laser ( λ=1064nm ) on carbon fiber composite strip under preloading. The effects of laser power and preloading on fracture morphology, temperature of the center of the irradiation area and fracture time were investigated. The experimental results show that when the preloading was lower than the fracture threshold, the laser irradiating could cause matrix damaging, fracturing with fluffy wire drawing and burning through for laser power density of 236.17W/cm2, 407.39W/cm2, 634.39W/cm2, respectively. The maximum temperature of the spot center increased with the increase of laser power, with rising and falling edges varying in a stepwise way. Under the laser irradiation with the same power density, the higher value of preloading corresponded to the less fracture time. However, when the preloading was 20% over the fracture threshold, the influence of the laser power density was significantly reduced. Similarly, when the laser power density was 634.39W/cm2, the fracture time was less influenced by the value of