Damping characterization of threaded joints using a mode-specific strain energy indicator

<jats:p>Contact damping contributes significantly to overall structural damping in most engineering systems, yet its prediction remains difficult without physical prototypes. We present an experimental investigation of modal damping in a simplified test specimen which serves as a representative model of a bolted joint assembly with adjustable prestress, allowing controlled exploration of contact conditions. The employed approach enables direct comparison of damping ratios under free vibrations. Our goal is to identify parameters or physical quantities that can be calculated without solving the actual contact problem and stillcan predict how mechanical contact influences modal damping in case of various geometries.</jats:p>