Stress Distribution and Strength in Shear on the Adhesive Lap Joint Loading Bending Moment

Abstract

The stress distribution and the maximum stress in shear at the circular area of adhesive lap joint were discussed theoretically and experimentally in this article. The joint carries the bending moment due to external force P which is parallel to lap surface and at a distance ℓ from the center of adhesive area. The following equation with respect to the maximum shear stress ${\tau '_{\max }}$ was derived and verified experimentally.

$${\tau '_{\max }} = \frac{P}{{\pi{R^2}}}(\frac{{2\ell }}{R}\alpha + \beta )$$

where R is radius of adhesive circular area; α and β are stress concentration factors and are 1.2 and 2, respectively.