Remote laser cutting of CFRP: influence of the edge quality on fatigue strength

Johannes W. Stock; Michael F. Zaeh; Justinian P. Spaeth

doi:10.1117/12.2037793

20 February 2014 Remote laser cutting of CFRP: influence of the edge quality on fatigue strength

Johannes W. Stock, Michael F. Zaeh, Justinian P. Spaeth

Proceedings Volume 8963, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III; 89630T (2014) https://doi.org/10.1117/12.2037793
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

The additional weight of the batteries in electric cars can be compensated by using carbon fiber reinforced plastics (CFRP) for structural parts of the passenger cell. Various machining processes for CFRP are currently subject to investigations. Milling and abrasive waterjet cutting implicate fiber pull out or delamination and, thus, do not thoroughly meet the requirements for mass production. Despite this, laser beam cutting has a great potential in large scale cutting of CFRP and is a predominant research topic. Remote laser beam cutting especially provides a good cut surface quality. Currently, the correlation between cutting parameters and edge quality is not sufficiently known. In particular, studies on the dynamic strength of remote laser cut parts are missing. Therefore, fatigue testing was performed with specimens cut by laser radiation and the results were compared with others made by milling and abrasive waterjet cutting. With these experiments, a comparable study of the different methods of CFRP cutting was achieved. The influence of both the heat affected zone (HAZ) and of defects like micro-fissures on the fatigue strength were evaluated.

Citation Download Citation

Johannes W. Stock, Michael F. Zaeh, and Justinian P. Spaeth "Remote laser cutting of CFRP: influence of the edge quality on fatigue strength", Proc. SPIE 8963, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III, 89630T (20 February 2014); https://doi.org/10.1117/12.2037793

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