A contact simulation algorithm has been developed, appropriate to represent the transient interaction phenomena between the tyre deformation and the tread micro-slip. The tyre tread is modelled as a combination ofradial and tangential viscoelastic elements, the contact behaviour of which was extensively investigated prior to their integration into the belt model. The tread foundation was coupled to the well-established, analytical ring on elastic foundation model, the solution of which was acquired by the modal reduction/expansion method. The algorithm was enriched with a string-based, non-linear sidewall foundation. Initially, the general contact behaviour of the model was presented and published experimental work was used for its evaluation. The tread micro-slip has been found to be dictated by the belt deformation with regards to both general behaviour and local, non-linear phenomena. The level of convention between the belt deformation and the tread slip is heavily influenced by the friction potential of the surface, which reacts to the tread shear displacement. Two contradicting contact deformation mechanisms of the belt were identified: the solid disk-like one and the combination of the bending and the relaxation of the, inflation-induced, radial stress. The first mechanism results in a horizontally expanding belt while the second one results in a horizontally shrinking belt and the characteristic concave formation. Relative to each other, the level of conformation to each mechanism is depicted on the contact stress distribution of the tyre and associates it with the belt mechanical properties. The mechanism explains a frequent contradiction of experimental results observed in the literature. In general, the proposed approach can be easily extended in order to incorporate the rotational and horizontal translational degrees of freedom of the wheel, in addition to the vertical one assigned here. The wheel motion (kinematically or dynamically induced) will impose a dynamic excitation to the belt through the sidewall structure, altering the contact interaction of the tread elements with the ground. Accordingly, this study constitutes an initial basis for the study of a number of transient phenomena related to the interaction between tyre structural deformation and shear force development.
Frictlonal contact behaviour of the tyre: The effect of tread slip on the in-plane structural deformation and stress field development
Reibkontaktverhalten eines Reifens: Einfluss des Laufflächenschlupfs auf die ebenflächige Strukturdeformation und Spannungsfeld-Entwicklung
Vehicle System Dynamics ; 48 , 8 ; 891-921
2010
31 Seiten, 20 Bilder, 3 Tabellen, 44 Quellen
Article (Journal)
English
Freiheitsgrad , Autoreifen , Straßenfahrzeuglauftechnik , transienter Zustand , Schubübertragung , Schubkraft , Algorithmus , nichtlineares dynamisches System , Deformationspotenzial , Modellsimulation , Modellstruktur , Spannungsfeld (mechanisch) , Berührungsfläche , Druckverteilung , Fahrzeuglängsdynamik , Zeitbereich , Modellmethode , Reibkraft , Reifenlauffläche , Einflussfaktor