Joint damping prediction by thin layer elements

This paper deals with modeling of the assembled metallic structures with dry bolted joints. The damping parameters are found experimentally from a generic isolated joint test bench. The influence of joint parameters, such as normal contact force and frequency dependence is examined. Once the joint parameters are found, they are input into a finite element model. An assembled structure is modeled with thin layer elements on the joints’ interfaces. These layers contain the measured stiffness and damping parameters. A simple structure is used to support the experimental and simulation work. The results of the experimental modal analysis are compared with numerical simulations. The sensitivity of the joint parameters, normal contact force distribution, and orthotropic behavior of the thin layer elements are examined. Nomenclature σ, ε, τ, γ stress, strain, shear stress, shear angle η loss factor j imaginary unit a acceleration M mass, mass matrix k, K, K∗ stiffness, stiffness matrix, complex stiffness matrix E values of the element’s stiffness matrix D damping matrix G shear modulus u, d, A displacement, thickness, area α dissipation multiplier F force