Models of Longitudinal Collision of Bars with Nonparallel Faces

Аннотация

A model of the longitudinal collision of bars having nonparallel impact faces proposed by V. B. Sokolinsky, in which the contact characteristic is described by a quadratic dependence, is considered. Longitudinal stresses in bars correspond to experimental data only at the angles of impact faces being offset less than 0.5°. At angles greater than 1°, the discrepancy between the theoretical and experimental results reaches 20%. The obtained values of the moment at faces of the bars do not correspond to the experiment. A model is proposed, where stress distribution along the radius of the contact surface of bars obeys a linear law. The dependence of contact forces and the moment at faces of bars on the angle of impact faces offset and their local contact deformations is obtained. The changes in longitudinal stresses with time are determined in bars. This model gives the results closer to the experiment in comparison with V. B. Sokolinsky’s model and can be used to estimate the maximum allowable angles of the impact faces offset when designing and operating percussion systems of drilling and breaking machines.