Abstract
Short pulsed laser is preferred to avoid the thermal damage in processing the heat sensitive material, such as carbon fiber reinforced plastic (CFRP). In this paper, a numerical model capturing both the material ablation and polymer matrix pyrolysis processes in pulsed laser processing is established. The effect of laser pulse length from ns order to μs order is studied. It was found that with shorter pulse length, ablation depth is increased and heat affected zone is remarkably reduced. Moreover the pyrolysis gas transport analysis shows that shorter pulse length results in a larger internal pressure. At pulse length in ns order, maximum pressure as high as hundreds of times atmospheric pressure in CFRP could be produced and leads to mechanical erosion of material. The predicted ablation depth of a single short laser pulse conforms well to the experiment result of the CFRP laser milling experiment.
Highlights
Advanced composite materials with high specific strength and design-versatility properties are preferred in industries such as aircraft, electric vehicle, sports goods, etc. [1,2]
The experimental results show that the mechanism of material removal and heat affected zone (HAZ) formation where the polymer matrix is damaged in the laser processing is complicated
DegradeHowever, than carbon fiber, the many researchers focus matrix on the degradation process is in much the numerical degradation ofjust polymer direct material ablation in the laser-material interaction area neglecting the polymer matrix degradation plays an important role in the heat and mass transport in the carbon fiber reinforced plastic (CFRP) laser processing
Summary
Advanced composite materials with high specific strength and design-versatility properties are preferred in industries such as aircraft, electric vehicle, sports goods, etc. [1,2]. DegradeHowever, than carbon fiber, the many researchers focus matrix on the degradation process is in much the numerical degradation ofjust polymer direct material ablation in the laser-material interaction area neglecting the polymer matrix degradation plays an important role in the heat and mass transport in the CFRP laser processing. For CFRP short pulsed laser exceeds processing, polymer degradation process should be assumed the overall volume is constant neglecting the material surface ablation. Under the condition that extremely high peak short pulsed laser processing, polymer degradation process should be analyzed with the surface input generates a large heating rate, the specific polymer degradation and its impact on the whole ablation of material. In order to accurately predict the polymer pyrolysis in In this a numerical model is established to capture the CFRPmodels—finite‐rate short pulsed laser the heating paper, circumstance of short pulsed laser, two polymerboth degradation ablation and the formation process of HAZ. The short pulsed laser milling experiments are performed to validate the numerical model
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