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    Item type:Publication, Access status: with files ,
    Tribological investigation of the interface between steel pin and CFRP tube
    (2025)
    Bischop, Floyd
    ;
    Deutschmann, Torben
    ;
    Krause, Dieter
    Carbon fiber reinforced plastics (CFRP) offer great potential for lightweight construction due to their high specific stiffness and strength, especially in electric drive systems with rotating components. However, the substitution of steel by CFRP in highly stressed, tribologically relevant interfaces, such as hollow shank taper interfaces (HSK), is hindered by numerous influencing factors. To systematically investigate these factors, particularly the winding angle and lubrication, the tribological properties of CFRP are analyzed on an application-oriented test rig. For this purpose, pin-on-tube tests are conducted using CFRP tube samples with three winding angles (±10°, ±45°, ±89°), as well as hardened steel references tested against steel counterfaces are conducted. The samples undergo linear reciprocating motion under a normal force of 450 N over 20,000 cycles. The friction coefficients are determined under dry conditions as well as under flood lubrication with a water-miscible coolant lubricant. The results show that lubrication with coolant lubricant significantly reduces the dynamic coefficient of friction. The lowest friction coefficients, 0.17, are achieved at a winding angle of ±10°. In lubricated tests, the specific wear was below the measurement resolution. Microscopic images show typical fiber-matrix damage in unlubricated samples, which is significantly less pronounced under lubricated conditions. A comparison with literature values for steel HSK interfaces demonstrates the influence of the pin-on-tube arrangement for reference samples. The investigations show the suitability of CFRP for tribologically stressed interfaces. However, further studies are necessary for transfer to real applications such as HSK.
    Publicationtype: Conference Paper
      7  17
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    Item type:Publication, Access status: with files ,
    Experimental study on the fatigue performance of CFRP beams with structured surface load introduction under cyclic loading
    (2025)
    Deutschmann, Torben
    ;
    Bischop, Floyd
    ;
    Gadinger, Marc
    ;
    Wartzack, Sandro
    ;
    Krause, Dieter
    CFRP is widely used in lightweight structures subjected to cyclic loading. However, the fatigue performance at the structural level, particularly with mechanical joints, remains insufficiently understood. This study investigates the fatigue behavior of quasi-isotropic CFRP square tubes under cyclic 3-point bending, with a focus on a load introduction concept using bolted connections with structured surface plates. The specimens are tested under fully reversed loading at 1 Hz. Quasi-static baseline tests reveale linear behavior up to failure and high reproducibility between specimens. Cyclic tests show a clear increase in fatigue life with decreasing load amplitude. Hysteresis analysis reveals asymmetric behavior and narrowing around the zero-crossing prior to failure, especially in high-cycle specimens. The specimen with the highest cycle count exhibited a distinct fiber fracture on the tensile side, suggesting a change in failure mode compared to quasi-static loading. The results highlight the relevance of the hysteresis loop shape as a potential indicator for fatigue damage and structural monitoring. The findings underscore that fatigue failure may occur in locations different from those under static loading, suggesting that conventional design approaches based on static safety factors may be insufficient for the design of CFRP structures.
    Publicationtype: Conference Paper
      8  14