Separation of dynamically induced low-frequency stresses in rods and pipes

Expressions are evaluated with which the separation of oppositely propagating axial-stress components in rods and pipes can be achieved from stress waveforms obtained at different locations on the rod or pipe. The corresponding measurement/processing procedures can produce either the power spectra or the waveforms of these components. Simplifications of basic procedures for waveform evaluation are formulated whenever possible.A few experiments are described which verify the analytical results obtained theoretically and which also demonstrate the applicability of the separation procedures.