Abstract :
When loading the rope considering changes in the geo-metric parameters and mechanical properties of the screw elements of the axial tensile strands (wire) layers, interact with each other, get an elastic deformation, and therefore there is a waviness in the rope. The main experiment that can confirm the feasibility of the study of the stress-strain state of the lifting rope, taking into account the undulation in nonlinear relationships, is the study of the strain of stretching and torsion of ropes made both taking into account the developed changes in the geometric parameters and mechanical properties of the screw elements, and without taking into account the resulting changes in the geometric parameters and mechanical properties of the screw elements. To study the stress-strain state of the lifting rope, experimental samples of lifting ropes were made. To conduct the experiment, a device was created that measures the tensile and torsional deformations with enough accuracy in the laboratory conditions with the use of the breaking machine UMM-5. In laboratory-ton conditions, it was determined the elongation of the rope and the angle of rotation. Based on the data obtained, it was concluded that the use of lifting ropes made both considering the difference in geometric parameters and without considering the geometric parameters and mechanical properties of the screw elements of the rope. The results of experimental studies may be in demand in the con-struct ion of lifting ropes, as well as in their operation.
Keyword :
rope, strain, tension, undulation, twist, bend.