Abstract
In order to obtain a dynamic stress expression in a finite body subjected to an impact load, a theoretical study and experimental studies using PMMA rod specimens are carried out. An impact load induces a complicated dynamic stress sate in a finite rod. Such a stress pulse height depends on the specimen length and the supporting condition at both ends. In come materials, the stress attenuation during the wave propagation will also affect the pulse height. Including these influences, the expressions of dynamic stress are derived for an impact compression and for a torsion. The coefficient of reflection at the ends of a bar and the attenuation coefficient are evaluated in terms of the strain gage method. Theoretical results given in the available form shoed fairly good agreement with the experimental results.
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