Publisher DOI: 10.1016/j.jmatprotec.2014.09.004
Title: Influence of weave structure on delamination when milling CFRP
Language: German
Authors: Hintze, Wolfgang 
Cordes, Marcel 
Koerkel, Gregor 
Keywords: CFRP; delamination; milling; undulation; woven fabric
Issue Date: 2015
Publisher: Elsevier
Source: Journal of Materials Processing Technology (216): 199-205 (2015)
Abstract (english): 
The increasing use of carbon-fiber-reinforced plastic (CFRP) is, in addition to weight reduction, driven by decorative elements especially in the automotive industry. Different kinds of woven CFRP laminates are applied for visual effects, which, however, demand a high level of surface quality of the workpiece including the trimmed edges. This study is the first to investigate the correlations between weave induced fiber undulation and delamination when machining CFRP with a woven fabric. In order to analyze the influence of the undulation, several slots were milled into CFRP with a plain weave structure using polycrystalline diamond cutters. The relative position of the trimmed edge to the weave undulation was varied by inclining the milling path slightly relative to the fiber orientation. Surface damage and fiber protrusion from the trimmed edge were determined separately. To identify the fiber undulation angle and thickness of the top matrix layer, tomographic measurements of the laminate were used. Additionally, a theoretical model for maximum fiber protrusion was established. It became apparent that the combination of fiber undulation angle and thickness of the top matrix layer are responsible for different occurrences of delamination. The influence of tool geometry on delamination is less significant.
ISSN: 1873-4774
Journal: Journal of materials processing technology 
Institute: Produktionsmanagement und -technik M-18 
Document Type: Article
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