Efficient Modelling Of Contact Interfaces Of
Joints In Built-up Structures
Author(s)
L. Gaul & M. Mayer
Abstract
This paper introduces an improved approach to model contact interfaces of fixed
joints in finite element analysis (FEA) with regard to prediction of the vibration
behaviour of built-up structures. The approach consists of two parts: (1) the
development of a suitable, new contact model which considers the most important
physical effects of wave propagation over the contact interface; and (2) the
implementation of the contact model in commercial finite element software. The
new model is based on the contact models of Hertz and Mindlin for the contact of a
single spherical asperity with an elastic plane. The Hertzian microscopicmodel for
normal contact is then generalized with a statistical approach for rough surfaces
introduced by Greenwood to a macroscopic normal contact model for engineering
surfaces. To model the macroscopic tangential contact, a new model based on
Mindlins approach is introduced which accounts accurately for microslip effects
and considers the dependence of tangential contact behaviour on the normal pressure.
For implementing the contact model in FEA, a special isoparametric contact
element, the so-called zero thickness element, is programmed. The use of this element
compared with existing contact algorithms has some major advantages with
regard to the application of modelling the contact in fixed joints considered in this
paper. The introduced approach is verified by simulating the vibration behaviour
of a built-up structure and proving the prediction quality by comparing simulation
results with experimental data.
Keywords: contact mechanics, contact elements, joints, joint modelling, microslip,
contact damping, hysteresis model, evolution equation.
Keywords
contact mechanics, contact elements, joints, joint modelling, microslip,
contact damping, hysteresis model, evolution equation.
Related Book
Other papers in this volume
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