Investigation into the effect of surface roughness on the damping of tack-welded structures using the response surface methodology approach

Abstract

In the present work, the response surface methodology (RSM) approach has been used to investigate the mechanism of interface slip damping in layered tack-welded structures with varying surface roughness. Many experiments have been conducted on a number of mild steel specimens with various roughness conditions at the interfaces to study their effect on the damping capacity of the layered and jointed welded structures. The response is modeled using the RSM approach on experimental data. The significant coefficients are obtained by performing the analysis of variance at a 5% level of significance. The natural frequency and amplitude of excitation, kinematic coefficient of friction, surface roughness and relative dynamic slip at the interfaces have been observed to play vital roles on the damping capacity of such structures. The model sufficiency has been found to be satisfactory as the coefficient of determination (R²) and adjusted R²-statistic (R²adj) are found to be 96.9% and 96.8%, respectively.