Experimental Investigation of Damping Characteristics of Bolted Structural Connections for Plates and Shells.
Abstract
Reducing the contact force in bolted structural connections can reduce system vibration amplitudes by enhancing joint damping capacity. A test model consisting of two concentric circular cylindrical shells and four vanes connected by groups of bolts was tested and analyzed to investigate the relationship between the contact force and the system damping. A viscoelastic material was then introduced between the contacting surfaces and its effects on system damping were again investigated. Experimental results show that resonant frequencies of modes whose mode shapes provided the most differential motion at the joint connection were shifted down in frequency and the damping increased. This damping increase and frequency shift continued as contact force was reduced until the structural joints moved into the total slip regime where the response becomes nonlinear. Keywords: Structural damping, Bolted connections, Viscoelastic material random excitation, Swept sine excitation, Shells and plates.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1987
- Accession Number
- ADA186075
Entities
People
- Jonathan C. Iverson
Organizations
- Naval Postgraduate School