Breaking test and vibration response analysis of cement mortar plate by shock load
Hammering and uniform shock test of cement mortar plate were introduced. The opposite sides of the plate were elastic support. Through cyclic shock with amplitude increasing, the failure features, relationships between hammering force and acceleration response, and, relationships between impact energy and acceleration response were studied. The results show that there is a transverse crack nearby the midspan of the plate. The failure shape of it is brittle splitting failure. Relatively, the location of failure is skewed toward the midspan of it by uniform shock. Time history curves of force by hammering include three stages, i.e. major shock, secondary shock and unloading. Acceleration response increases with the increase of hammering force. However, hammering force and acceleration response decrease obviously after the plate appearing transverse crack. Then, there are two groups of acceleration response regions by uniform shock. Acceleration response increases with the increase of impact energy. Once impact energy reaching a certain degree, acceleration response decreases obviously. If impact energy keeping increase, acceleration response increases again. But, brittle splitting failure occurs rapidly, and acceleration response decreases obviously again. Furthermore, support bolt can absorb some of impact energy.
1.Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2.Key laboratory of Water Science and Engineering, Ministry of Water Resources, Nanjing 210029, China
Abstract：Hammering and uniform shock test of cement mortar plate were introduced. The opposite sides of the plate were elastic support. Through cyclic shock with amplitude increasing, the failure features, relationships between hammering force and acceleration response, and, relationships between impact energy and acceleration response were studied. The results show that there is a transverse crack nearby the midspan of the plate. The failure shape of it is brittle splitting failure. Relatively, the location of failure is skewed toward the midspan of it by uniform shock. Time history curves of force by hammering include three stages, i.e. major shock, secondary shock and unloading. Acceleration response increases with the increase of hammering force. However, hammering force and acceleration response decrease obviously after the plate appearing transverse crack. Then, there are two groups of acceleration response regions by uniform shock. Acceleration response increases with the increase of impact energy. Once impact energy reaching a certain degree, acceleration response decreases obviously. If impact energy keeping increase, acceleration response increases again. But, brittle splitting failure occurs rapidly, and acceleration response decreases obviously again. Furthermore, support bolt can absorb some of impact energy.
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