SAMPE Journal - July/August 2022 - 66
FEATURE
INVESTIGATION ON
MATERIAL EQUIVALENCY
Photo provided by: www.cevotec.com/
Fiber Patch Placement in Aerostructures:
Investigation on Material Equivalency
Dimitrios Sikoutris1, Florian Lenz1, Herbert Weidinger1, Henriette Morgenstern1 and Neven Majić2
1Cevotec GmbH, Unterhaching, Germany
2
Augsburg University of Applied Sciences, Augsburg, Germany
Email: florian.lenz@cevotec.com
ABSTRACT
Fiber Patch Placement is an advanced technology for automated fiber lay-up of geometrically complex
composites and reinforcements. Patches are cut from a fiber reinforced tape and applied precisely on
predetermined positions on a mold with a flexible patch gripper. The individual orientation of each patch
along load paths opens new potential for automated fiber lay-up applications in aerospace. However, since
the Fiber Patch Placement laminates uses discontinuous fibers, the question of material equivalency to
classical laminates with continuous fibers arises. To investigate that question, a series of mechanical tests were
conducted according to relevant aerospace testing standards. In screening characterization on unidirectional
(UD) reinforced laminates, it can be shown that the stiffness of patched specimens is almost at level with
continuously reinforced reference specimens. And although the static tensile strength shows a noticeable
knockdown factor compared to a continuous fiber laminate, Fiber Patch Placement laminates feature design
allowables based on open hole tension & compression, compressions after impact and bearing strength which
are at level with the values of the conventional laminate. These results show the potential for Fiber Patch
Placement to become a standard manufacturing technology for high performance aerospace composites
while maintaining material equivalency.
66 | SAMPE JOURNAL | JULY AUGUST 2022
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SAMPE Journal - July/August 2022
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Contents
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SAMPE Journal - July/August 2022 - Contents
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