Influence of Cable Design on Stress State of Elastic Shell in Elastomer-Cable Rope

Elastomer-cable ropes (ECR) can be used as tractive and transporting elements in mine hoisting installations, powerful conveyors, or as stay ropes in permanent structures. The operating conditions and design of such ropes may differ in various conditions; however, the composite structure of ropes has its unique advantages in industrial applications. Article purpose is determining the influence of cable design on a stress state of elastic shell in a elastomer-cable rope. Article methodology is in numerical calculation using CAD and an analytical method used in strength of materials. Dependency of a stress-strain state is established for a elastomer-cable rope (belt) shell, which is loaded by a force evenly distributed among the cables, considering helical strand shape and periodical placement of cables with opposite twisting directions in a rope (belt). Energy loss values due to cable and elastomer-cable rope design are established. The scientific novelty of the article is in establishing that a helical strand shape of cables causes a twisting moment (torque) that is proportional to a part of an internal loading force on cables, which is transmitted by strands, a sine of inclination angle of helical strands and a distance between centers of strands cross-sections and cable axis. Stresses in the elastic shell decrease when cable placement spacing increases and does not exceed 1.7 cable diameters. Practical significance of the article is in establishing the dependency of a stress state of elastic shell in a elastomer-cable rope on rope and cable design, which allows taking into account this phenomenon during the rope design phase, increase of accuracy of determining its stress-strain state and reliability during operation in mine hoisting installations, powerful conveyors or permanent structures.