impact wave
8.The result shows that under the effect of repeated impact load, the stress wave produces reflection in the metallurgical junction plane between coating and basal body, and forms stretch wave causing longitudinal split and angle split of coat; the microcosmic spot pitting and deep layered peeling off occur in coating surface due to stress concentration; the energy accumulation of impact loading causes rigidity variation and plastic deformation.
10.The dynamic force-displacement relation curve is of crucial important to the design and operation of mechanical impact devices.Using one-dimensional wave mechanics and characteristic line theory, this paper presents a testing method for determination of dynamic force-displacement relation curve from one-point strain measurement on an elastic rod endface.The principle of measurement, data processing method and experimental results for penetration into granite are discussed.4figs.,5refs.
