Date: 28 Feb 2012

Transmission of Guided Waves Across Prestressed Interfaces

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Abstract

Prestresses can be both applied and/or environmentally generated and change the dynamics of structures. The preload can change due environmental factors, such as temperature variations, and operational excitation including impulsive loading. This study uses a novel Hopkinson bar configuration, the Preload Interface Bar, and investigates the effect of prestress on the stress wave propagation across interfaces between the incident and transmission bars. The non-ideal interface with a partial gap is experimentally investigated and analyzed. The preloaded partial gap causes generation of flexural waves at the interface. The interface is modeled as a preload dependent elastic joint in which flexural and longitudinal waves can be transmitted and reflected. The analytical and experimental energy transfer and mode conversion from reflection and transmission will be examined in the spectral domain. The analysis shows that as the preload increases the interface becomes stiffer and converges to a near-perfect 1-D interface.