SEDL / STP / STP981-EB / STP30331S

Deformations and Strains in a Thick Adherend Lap Joint

Post, D
Virginia Polytechnic Institute and State University, Blacksburg, VA

Czarnek, R
Virginia Polytechnic Institute and State University, Blacksburg, VA

Wood, JD
Virginia Polytechnic Institute and State University, Blacksburg, VA

Joh, D
University of Missouri-Rolla, Rolla, MO

Pages: 12    Published: Jan 1988

Download this paper for $25 PDF (492K)          View License Agreement
Abstract

Displacement fields in a thick adherend lap joint were measured by high-sensitivity moiré interferometry. Contour maps of in-plane U and V displacements were obtained across adhesive and adherend surfaces. Loads ranged from a modest load to a near-failure load. Quantitative results are given for displacements and strains in the adhesive and along the adhesive/adherend boundary lines. The results show nearly constant shear strain in the adhesive, nonlinear strains as a function of load or average shear stress, and viscoelastic or time-dependent response. Longitudinal normal strains in the adhesive are nearly two orders of magnitude less than the shear strains.

With its subwavelength displacement resolution and high spatial resolution, moiré interferometry is especially well suited for deformation studies of adhesive joints.