Improvement of measurement techniques for damping induced by micro-sliding

This paper deals with the damping caused by friction in joints. A new test bench is presented and justified by comparisons made with devices described in the literature. The purpose of this academic bench is to measure the damping induced by partial slip and friction in a planar joint. Moreover, allows uncoupling normal static and dynamic tangential forces. A new method for so-called stopped-sine excitation was developed. It allows more precise monitoring of the evolution of the vibration frequency and damping of non-linear modes. This method is associated with piezoelectric exciters for greater efficiency when stopping excitation. A large number of experimental results are presented and discussed. They are used to characterize the damping induced by micro-sliding in the bonds.

► This experimental device determines non-linear damping in interfaces with controlled loads.
► This device allows uncoupling of normal static and tangential dynamic loads in interfaces.
► The chosen stopped-sine excitation allows to study accurately non-linear damping.
► The use of piezoelectric patches is the key to success of stopped-sine excitation.
► Comparisons with reference measures on monolithic beam allows to set apart the damping due to micro-sliding in interfaces.