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 MSA  Vol.11 No.8 , August 2020
Mechanical Properties of Remote-Laser Cut CFRP and Thermographic Laser-Process Monitoring
Abstract: Remote-laser beam cutting is a productive technology without tool wear. Especially when cutting carbon fiber reinforced polymers (CFRP), it offers constant manufacturing quality. Since it is a thermal process, a heat-affected zone (HAZ) is formed at the edge of the cut. Based on quasi-static and cyclic mechanical tests on open-hole specimens, the influence of the process on the mechanical properties of CFRP is shown. The quasi-static tests are in good correlation with results from other researchers by indicating an increase in the maximum tensile stress of the test specimens, cut by remote-laser. The reason is the rearrangement of the shear stresses and a reduction of the notch stress concentration. However, the results of the present study show that excessive expansion of the HAZ leads to a reduction in the maximum tensile stress compared to milled test specimens. Under cyclic load conditions, remote-laser beam cutting does not lead to a more pronounced degradation than milling. The mechanical properties of the notched test pieces are sensitive to the expansion of the HAZ. For the production of components it is therefore necessary that the remote-laser beam cutting is carried out under controlled and documentable conditions. For this purpose, process thermography was tested as a tool for quality assurance. The results show that the technology is basically suitable for this task.
Cite this paper: Rose, M. , Schettler, S. , Klemm, F. , Beyer, E. and Zimmermann, M. (2020) Mechanical Properties of Remote-Laser Cut CFRP and Thermographic Laser-Process Monitoring. Materials Sciences and Applications, 11, 560-575. doi: 10.4236/msa.2020.118037.
References

[1]   Klotzbach, A., Hauser, M. and Beyer, E. (2011) Laser Cutting of Carbon Fiber Reinforced Polymers using Highly Brilliant Laser Beam Sources. Physics Procedia, 12, 572-577.
https://doi.org/10.1016/j.phpro.2011.03.072

[2]   Harada, Y., Kawai, K., Suzuki, T. and Teramoto, T. (2012) Evaluation of Cutting Process on the Tensile and Fatigue Strength of CFRP Composites. Materials Science Forum, 706-709, 649-654.
https://doi.org/10.4028/www.scientific.net/MSF.706-709.649

[3]   Herzog, D., Jaeschke, P., Meier, O. and Haferkamp, H. (2008) Investigations on the Thermal Effect Caused by Laser Cutting with Respect to Static Strength of CFRP. International Journal of Machine Tools and Manufacture, 48, 1464-1473.
https://doi.org/10.1016/j.ijmachtools.2008.04.007

[4]   Harada, Y., Suzuki, T., Nishino, M. and Niino, H. (2012) Investigation on the Tensile Strength of CFRP/CFRTP Manufacturing Using High-Power Lasers. Proceeding of International Symposium on Laser Processing of CFRP and Composite Materials, Yokohama, 26-27 April 2012.

[5]   Stock, J.W., Zaeh, M.F. and Spaeth, J.P. (2014) Remote-Laser Cutting of CFRP: Influence of the Edge Quality on Fatigue Strength. SPIE 8963, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III, 89630T.
https://doi.org/10.1117/12.2037793

[6]   Zaeh, M.F., Byrne, G. and Stock, J.W. (2017) Peak Stress Reduction in the Laser Contouring of CFRP. CIRP Annals—Manufacturing Technology, 66, 249-252.
https://doi.org/10.1016/j.cirp.2017.04.126

[7]   Stock, J. and Kerschreiter, J. (2016) Modelling the Stress Concentration in CFRP at Notches with a Thermally Influenced Cut Edge. Advanced Materials Research, 1140, 288-295.
https://doi.org/10.4028/www.scientific.net/AMR.1140.288

[8]   Leone, C. and Genna, S. (2018) Heat Affected Zone Extension in Pulsed Nd:YAG Laser Cutting of CFRP. Composites Part B, 140, 174-182.
https://doi.org/10.1016/j.compositesb.2017.12.028

[9]   Kalyanasundaram, D., Gururaja, S., Prabhune, P. and Singh, D. (2018) Open Hole Fatigue Testing of Laser Machined MD-CFRPs. Composites Part A, 111, 33-41.
https://doi.org/10.1016/j.compositesa.2018.05.005

[10]   Kononenko, T., Freitag, C., Komlenok, M., Weber, R., Graf, T. and Konov, V. (2018) Heat Accumulation between Scans during Multi-Pass Cutting of Carbon Fiber Reinforced Plastics. Applied Physics A, 124, 1-7.
https://doi.org/10.1007/s00339-018-1647-9

[11]   Freitag, C., Onuseit, V., Weber, R. and Graf, T. (2012) High-Speed Observation of the Heat Flow in CFRP during Laser Processing. Physics Procedia, 39, 171-178.
https://doi.org/10.1016/j.phpro.2012.10.027

[12]   Cheng, C., Tsui, Y. and Clyne, T. (1998) Application of a Three-Dimensional Heat Flow Model to Treat Laser Drilling of Carbon Fibre Composites. Acta Materialia, 46, 4273-4285.
https://doi.org/10.1016/S1359-6454(98)00090-1

[13]   Li, M., Li, S., Yang, X., Zhang, Y. and Liang, Z. (2019) Effect of Lay-Up Configuration and Processing Parameters on Surface Quality during Fiber Laser Cutting of CFRP Laminates. The International Journal of Advanced Manufacturing Technology, 100, 623-635.
https://doi.org/10.1007/s00170-018-2728-9

[14]   Jaeschke, P., Kern, M., Stute, U., Kracht, D. and Haferkamp, H. (2014) Laser Processing of Continuous Carbon Fibre Reinforced Polyphenylene Sulphide Organic Sheets—Correlation of Process Parameters and Reduction in Static Tensile Strength Properties. Journal of Thermoplastic Composite Materials, 27, 324-337.
https://doi.org/10.1177/0892705712446016

[15]   Fürst, A., Klotzbach, A., Hühne, S., Hauptmann, J. and Beyer, E. (2013) Remote Laser Processing of Composite Materials with Different Opto-Thermic Properties. Physics Procedia, 41, 389-398.
https://doi.org/10.1016/j.phpro.2013.03.092

[16]   Shayed, M.A., Cherif, C., Hund, R., Cheng, T. and Osterod, F. (2010) Carbon and Glass Fibers Modified by Polysilazane Based Thermal Resistant Coating. Textile Research Journal, 80, 1118-1128.
https://doi.org/10.1177/0040517509357648

[17]   Bertran, X., Labrugère, C., Dourges, M. and Rebillat, A. (2013) Oxidation Behavior of PAN-Based Carbon Fibers and the Effect on Mechanical Properties. Oxidation of Metals, 80, 299-309.
https://doi.org/10.1007/s11085-013-9388-9

[18]   Bluemel, S., Staehr, R., Jaeschke, P., Suttmann, O. and Overmeyer, L. (2015) Correlation of Internal and Surface Temperatures during Laser Cutting of Epoxy-Based Carbon Fibre Reinforced Plastics. Journal of Reinforced Plastics and Composites, 34, 662-671.
https://doi.org/10.1177/0731684415576981

 
 
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