关键词: 锤杆, 动态应力, 理论计算

Abstract: 　　A model hammer rod is treated as an object of study to explore the root causes of failure of currently used hammer rod. And according to the stress wave theory, a theoretical analysis of dynamic behaviour of the hammer rod is given to find the distributing and transmitting law of the dynamic stresses. Based on experimentations, a dynamic mathematical model of the hammer rod bearing the longitudinal impact load has been established, when considering the damping and dissipation effect of the falling body material and its construction. And then, some imitative calculations have been done with varied impact loads, the results are consistent with the experimental values and the statistical regularity of the hammer rod failure. So the problem how to calculate the dynamic stresses in hammer rod has been solved. On account of calculation results, an effective way, about improving the hammer rod bearing state and prolonging its service life has been put forward, too.

Key words: Dynamic stress, Hammer rod, Theoretical calculation