CFRP processing

 

Process

Due to the outstanding ratio of mechanical strength to weight, carbon fiber reinforced plastics (CFRP) are an important material for lightweight construction applications in the automotive and aerospace industries. As a result of the inhomogeneous mechanical and thermal properties of carbon fibers and matrix material, the processing is comparatively difficult. The difficulties are the delamination of the fibers from the matrix, the thermal load on the matrix and a high tool wear by the very hard carbon fibers. For this reason, laser radiation as a non-contact and wear-free tool, offers a great potential to make the CFK processing more efficient. To keep the thermal influence on the work piece as small as possible, especially the use of ultrashort pulsed laser radiation for CFRP processing is being evaluated.

 

Results

CFRP processing by USP laser radiation Copyright: Lehrstuhl für Lasertechnik LLT CFRP processing by USP laser radiation

Using ultrashort pulsed laser radiation and an average power of about 30 W, the processing of CFRP is realized with heat affected zones under 5 µm at removal rates of 30 mm³ / min. When using an average output power of 400 W, removal rates of 380 mm³ / min can be achieved with a heat-affected zone of approximately 45 µm. The ablation process can be utilized to realize separating cuts as well as 2.5 dimensional surface geometries as a preparation for repair operations.

 

Publications

J. Finger, 2013: Ablation and cutting of carbon-fiber reinforced plastics using picosecond pulsed laser radiation with high average power

 

Links

Laser material processing at Fraunhofer ILT

 

Annual Reports

Processing of CFRP with ultra-short pulsed laser radiation of high average power

Cutting of fiber-reinforced plastics 2012

Cutting of fiber-reinforced plastics 2011

Laser ablation for structuring thin, functional layers

 

Brochures

Laser processing methods for fiber composite plastics