Time integration of modal coordinates is a useful approach when estimating load histories on vehicle components. Such components are often exposed to broad band excitation making the damping a determining factor for the internal stress levels. In many truck chassis applications the damping is primarily due to energy losses in joints. This paper treats damping as an energy dissipative mechanism and presents a methodology that computes the energy dissipation equivalent modal damping to describe energy dissipation in joints. The energy dissipation in joints is computed in a separate analysis modelling contact, friction and micro-slip with ABAQUS. The methodology is based on non-linear static procedures in which the energy dissipation is calculated as a function of joint load. This relationship may be converted to a relation between the energy dissipation equivalent modal damping and the modal amplitude. The presented example of a Scania rear-light consol show how an iterative procedure may be used to exploit the estimation of the non-linear damping behaviour. In the presented example the proposed methodology produces time series of strain and acceleration that show good correlation with measured data indicating that it may be used for fatigue life estimations.
Using ABAQUS to predict the dynamic behaviour of joints
2005
13 Seiten, 7 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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