Производительность сил траловой системы – VI: математическое моделирование (часть III)

Abstract

Performance of external longitudinal and transverse forces developed in the course of towing the trawl systems, namely, the tension and compression forces of cables, ropes and yarns of the rope-net gears in commercial fishing of the longitudinal modulus of elasticity and the transverse modulus of elasticity in the cordage products. Physical and mechanical properties of the synthetic nylon threads, ropes and nylon cords, from which most trawl systems are made, are considered. Analysis of the physical and mechanical properties of synthetic rope products and cords based on the specified parameters for possible static and dynamic loads is proposed. Algorithms for calculating the physical and mechanical properties of threads, ropes and nylon cords are proposed under the condition of constant volume and mass. Method of calculating physical and mechanical properties of the nylon threads and ropes under the condition of uncertainty gives an error not exceeding 0.4% in calculating the relative elongation δε, but the maximum error δμ in calculating Poisson's ratio μ reaches 7.12%. This proves that the formula for calculating the Poisson's ratio μ for anisotropic bodies does not allow estimating this ratio at low loads and constant volume.