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Daimler/Secar CRP hybrid struts receive AVK Innovation AWARD; intelligent material mix allows large-scale production

As part of a development project, researchers at Daimler AG and the Austrian CRP (carbon fiber reinforced plastics) applications specialist Secar Technologie GmbH have developed an innovative new CRP composite pultrusion process enabling carbon fibers and metal to be pultruded in profile form in larger volumes.

Pultrusion is a continuous molding process in which reinforcing fibers are saturated with a liquid polymer resin and then carefully formed and pulled through a heated die to form a part. Pultrusion results in straight constant cross section parts of virtually any shippable length.

Reinforcing struts produced using this process, which are used in various AMG vehicles such as the C-Class Cabriolet and S-Class, have received the Innovation Award of the Verstärkte Kunststoffe e.V. (AVK) industry association at the Composite Europe trade fair.


Struts are used frequently in the substructure or front section of vehicles, so as to rigidify the bodyshell and optimize the driving characteristics in terms of comfort and sporty handling. CRP’s direction-related elasticity, its anisotropic behavior, precisely meets these requirements.

—Jörg Miska, Head of Body Development at Mercedes-AMG

In the pultrusion process employed, various reinforcing fibers and metal bands are introduced into an extrusion tool, where resin is added to form a string. The process is efficient in various respects: Firstly, optimized use is made of the carbon material thanks to minimal waste, and secondly the energy requirement is low owing to the very low process forces. There is no need for cost-intensive high-performance presses.

Due to the dedicated mix of various glass and carbon fibers, a high-performance resin and a high-strength metal band at the core, it is also possible to optimize other component functions such as damping and corrosion characteristics, temperature resistance and crash performance. In combination with the economic efficiency of the manufacturing process, this provides the ideal conditions for larger production volumes.


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