Abstract
This paper presents the transmission ratios of a strain pulse at various types of adhesive joint measured using strain gages. An impact compression load was applied by a pendulum to the joints of polymethylmethacrylate plates, such as a simple butt contact, a butt-bonded joint, a uniform lap-bonded joint, and offset lap-bonded joints. The transmission ratio Trε of strain is defined as Trε = εt / εi, where εi and εt are the strain pulse amplitudes measured in the incident and transmission plates, respectively. The strains were measured immediately after the arrival of a reflected wave at their measuring points. Trε for the lap-bonded joints was larger than that for the simple butt contact; however, Trε did not always increase with increasing lap width. The transmission ratio of the impact stress and the propagation of the stress wave are discussed on the basis of the results of numerical analysis using LS-DYNA software.
