Impact stress of a bar imperfectly fixed subjected to the impingiment of finite mass

When a striker of finite mass impinges on the end of bar which is imperfectly fixed at its distal end, the impact stress of striker and bar is analysed by accounting for reflection coefficient of stress wave at the striker-bar interface and terminal end of bar. The reflection coefficients of stress wave in this case are determined in the same way with the evaluation of reflection and transmission of wave passing through shafts having discontinuous cross-sectional area or interface of dissimilar materials. The results of analysis are compared with impact stress of bar perfectly fixed and experiment. The impact stress of bar imperfectly fixed is about 60%-80% of perfectly. The period of impact stress acting in imperfect fixing bar is shorter than in perfect fixing bar. Although the magnitude of impact stress predicted by the analysis is in agreement with the experiment, the shape of wave is a little difference. It is shown that the impact stress of striker-bar interface can be indirectly determined by evaluating the stress caused in striker.