Open AccessCharacteristics of the limit state of the rope
Author(s) -
Pavel Vovk,
I Chaiun
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1164/1/012087
Subject(s) - rope , ultimate tensile strength , wire rope , structural engineering , tension (geology) , deformation (meteorology) , yield (engineering) , ultimate load , state (computer science) , point (geometry) , materials science , mechanics , mathematics , composite material , engineering , physics , geometry , finite element method , algorithm
According to the Rules, in the calculation of ropes for strength, one characteristic is used, and it is the same regardless of the loading scheme. In the calculation method for permissible stresses, two strength characteristics are used: the yield strength or the tensile strength of the material of the part. It’s proposed the method for the theoretical determination of the characteristics of the ultimate elastic P e and ultimate elastic-plastic state P H under four loading schemes, and taking into account the operational breaks of the wires (two characteristics of tension with winding on a drum with a weight in guides and with a free suspension and two when stretching a straight rope.) The ultimate elastic state is determined by the longitudinal force in the section of the rope, at which the longitudinal deformation of one of the wires reaches the yield point ε T according to the schematized wire tension diagram σ – ε . The criterion for the ultimate elastic-plastic state of the rope is the achievement of one of the wires of the ultimate uniform deformation according to the diagram σ – ε . It is assumed that on the basis of the characteristics P e of the stretching of the rope according to the ultimate elastic state, it is possible to construct a method for calculating the strength of the ropes, which will have advantages over the existing one. Advantage arguments: – strength characteristics P e are directly related to the rope loading scheme – the values P e take into account all geometric parameters of single and double lay, as well as deformation properties of wires – characteristics P e allow to take into account the effect of wire breaks during the operation of the ropes.