3 years ago

Structural optimization and experimental investigation of CFRP lock nuts

Jakob Katz, Martin Klimach, Felix Haupt, Alexander Brechtel, Christian Mittelstedt

Publication date: Available online 13 November 2018

Source: Composites Part A: Applied Science and Manufacturing

Author(s): Jakob Katz, Martin Klimach, Felix Haupt, Alexander Brechtel, Christian Mittelstedt


This contribution deals with the development of a thread that can be used to screw two CFRP parts together. A CFRP drive shaft of a motor spindle and a CFRP lock nut are taken as examples for such parts and are further investigated.

As CFRP drive shafts are usually manufactured by filament winding and reworked by grinding, it is consistent to manufacture the thread in the shaft by grinding, too. For the CFRP lock nut two concepts are developed that do not require grinding or reworking. They are simply manufactured by compression moulding. Both concepts are optimized for high strength at low weight. Specimens of both optimized lock nut concepts and the corresponding shafts are manufactuered and tested regarding their eligibility to fix bearings on drive shafts. Subsequent tests proove the latter: At a weight of 48 grams the lock nuts could bear a load of 100 kN without damage.

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