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Polymers 2016, 8(8), 299; doi:10.3390/polym8080299

Study of Polymer Matrix Degradation Behavior in CFRP Short Pulsed Laser Processing

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Academic Editor: Mohamed Khayet
Received: 26 June 2016 / Revised: 26 July 2016 / Accepted: 9 August 2016 / Published: 15 August 2016
(This article belongs to the Special Issue Polymeric Fibers)
View Full-Text   |   Download PDF [2884 KB, uploaded 15 August 2016]   |  

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. View Full-Text
Keywords: CFRP; short pulse length; polymer pyrolysis; mechanical erosion CFRP; short pulse length; polymer pyrolysis; mechanical erosion
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Xu, H.; Hu, J. Study of Polymer Matrix Degradation Behavior in CFRP Short Pulsed Laser Processing. Polymers 2016, 8, 299.

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