Methodenentwicklung zur Charakterisierung des Stick-Slip-Verhaltens von TPU-Materialien

Translated title of the contribution: Method development to characterise the stick-slip behavior of TPU materials

Andreas Hausberger

Research output: ThesisMaster's Thesis

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Abstract

The stick-slip-phenomenon, as described in the literature, plays an extraordinary important role for thermoplastic and elastomer materials in many tribological applications. In a number of practical situations, stick slip behaviour as friction instability phenomenon may negatively influence the sliding performance of various components. Furthermore, due to the strong local adhesion, adhesion wear causing a significant reduction of the life time of the tribological relevant components (e.g., seals, wiper or damper) was observed. Hence, the objective of this Master Thesis was to characterize the stick-slip behaviour of polymeric materials. A novel rotation based test set-up was developed and implemented with data evaluation. To compare surface properties with bulk material properties a novel rotational based test set-up was implemented on an axial/torsional dynamic testing machine. By using that DMA, it was possible to perform surface and bulk tests on the same test configuration. For these experiments, two (one filled and one unfilled) thermoplastic polyurethane (TPU) systems were selected out from a variety of material configurations. Test specimens were produced under controlled conditions and were tested applying both, monotonic and cyclic loading. To comprehensively characterise the surface and bulk related stick-slip behaviour of TPUs, the test parameters (e.g., velocity, load and rotation) were systematically varied over a wide range. Torque-rotation curves were measured under monotonic and cyclic condition and the occurrence of stick-slip was determined based on critical stress and strain values. The load, velocity and amplitude dependences of the results were summarized in form of diagrams and in a Running Condition Stick-Slip Map. In addition to the experimental characterisation which can be used for improved material selection, a novel phenomenological modelling was carried out. The results of the bulk experiments can later be used as input data for FEM simulations and in combination with the knowledge of the phenomenological models, it is possible to make a more efficient component design.
Translated title of the contributionMethod development to characterise the stick-slip behavior of TPU materials
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Pinter, Gerald Gerhard, Supervisor (internal)
Award date18 Dec 2009
Publication statusPublished - 2009

Bibliographical note

embargoed until null

Keywords

  • TPU Stick-Slip Adhesion Modelling Hysteresis

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