Effect of Micro-slip on the Damping Capacity of Jointed Riveted Structures with Unequal Thickness

This paper addresses the influence of the partial slip phenomenon on the damping capacity of jointed riveted structures with unequal thickness. The dynamic response of built-up structures is influenced by the characteristics of the joints and the damping capacity of such joints has been analyzed by mathematical modeling and experiments. Damping at structural joints is associated with frictional losses caused by micro-slip and kinematics coefficient of friction at the interfaces. Such energy dissipation at various joints has a significant effect in limiting the magnitude of vibration. The free vibration of a beam jointed with rivets of unequal thickness with ratio of 2.0 undergoing a small dynamic deflection in the transverse direction has been studied using the energy approach to evaluate its damping capacity. The results of the theoretical analysis have been compared with the experimental results to verify the authenticity of the work. It has been found that the normal pressure and the micro-slip at the interfaces are the major parameters influencing the damping capacity of jointed riveted structures. The suggested method can be effectively utilized by the designers to fabricate the engineering built-up structures depending on the requirements of the damping capacity.

[1]  A. Polycarpou,et al.  A Dynamic Friction Model for Unlubricated Rough Planar Surfaces , 2003 .

[2]  E. J. Williams,et al.  A linearized analysis for frictionally damped systems , 1972 .

[3]  B. K. Nanda.  Study of the effect of bolt diameter and washer on damping in layered and jointed structures , 2006 .

[4]  C. F. Beards.  Feature Article: tutorials and items of special interest DAMPING IN STRUCTURAL JOINTS , 1992 .

[5]  L. Gaul,et al.  Nonlinear dynamics of structures assembled by bolted joints , 1997 .

[6]  Chia-Hsiang Menq,et al.  The influence of microslip on vibratory response, part I: A new microslip model , 1986 .

[7]  Vincent O. S. Olunloyo,et al.  Dynamic analysis of slip damping in clamped layered beams with non-uniform pressure distribution at the interface , 2008 .

[8]  B. B. Mikic,et al.  Areas of contact and pressure distribution in bolted joints , 1972 .

[9]  Wei Chen,et al.  Structural damping caused by micro-slip along frictional interfaces , 2005 .

[10]  C. F. Beards,et al.  Damping in structural joints , 1979 .

[11]  A. Polycarpou,et al.  Measurement and Modeling of Normal Contact Stiffness and Contact Damping at the Meso Scale , 2005 .

[12]  T. H. Pian.  A STUDY OF THE STRUCTURAL DAMPING OF A SIMPLE BUILT-UP BEAM WITH RIVETED JOINTS IN BENDING , 1954 .

[13]  Nabil Motosh.  Stress Distribution in Joints of Bolted or Riveted Connections , 1975 .

[14]  Eric E. Ungar,et al.  The status of engineering knowledge concerning the damping of built-up structures , 1973 .

[15]  D. M. McFarland,et al.  Experimental study of non-linear effects in a typical shear lap joint configuration , 2004 .

[16]  C. F. Beards,et al.  The damping of structural vibration by rotational slip in joints , 1977 .

[17]  Yoshimi Ito,et al.  A Study on Damping Capacity of a Jointed Cantilever Beam : 1st Report; Experimental Results , 1978 .

[18]  Yoshimi Ito,et al.  Theoretical Analysis for a Damping Ratio of a Jointed Cantibeam , 1973 .

[19]  Joseph Edward Shigley,et al.  Standard Handbook of Machine Design , 2004 .