Abstract
The main purpose of this paper is to express a general formulation for the theoretical analysis of longitudinal elastic wave propagation through a general and in particular the T and十 junctions. The bar joint is modeled as a rigid block. The bars are assumed to be all of the same thickness but may differ in width and may be of different materials. Elementary theory is applied to investigate the propagation of longitudinal wave. The present study indicates that for a T junction there would be no transmission of the longitudinal elastic wave. For a 十junction there would be no transmission of the longitudinal elastic wave into the perpendicular branches but the transmission into the horizontal bar was happened.
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