PSI - Issue 18

Abdeljalil Jikal et al. / Procedia Structural Integrity 18 (2019) 731–741 Abdeljalil JIKAL et al. / Structural Integrity Procedia 00 (2019) 000–000

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Keywords: Non-rotating wire rope; Strand; Accelerated corrosion test; Static damage; Mechanical properties; Failure forces; Theoritical modelisation.

Nomenclature y 

is the yield stress. is the ultimate stress. is the diameter of strand is the diameter of wire is the number of wires is the damage function is the life fraction is the immersion time

u 

t D f D

f n

is the cross section area of the strand

S

D



t

is the total time

f T s D u F ur F

is the static damage is the ultimate force

is the ultimate residual force

is the force just before the breaking

a F

is the applied force

F

is the nondimensional ultimate residual force is the nondimensional ultimate force is the endurance limit of the virgin strand is the material constant is equal to 8 for metallic is a parameter that depends on the studied material



u 

0 F

m



max F is the maximum force r F

is the rupture force of strand

1. Introduction Wire rope is characterized by complex hierarchical helical structures. It consists of a central core, which is the support of a wire rope on which several strands are wrapped. The strands themselves are assemblies of metallic wires helically twisted around a central core wire, which is the basic component of the cable Judge et al (2017). It is widely used in many engineering fields such as lifting loads, lashing floating structures, suspension bridges, and the mining industry Wang et al (2016) due to its huge mechanical properties, combining high axial loads, torsional stiffness and high stability Costello (1997). It has a high yield and high tensile strength while being flexible enough to be wrapped up before and after breaking Peterka et al (2014).Wire ropes used in industrial structures can take various forms, but all have a basic element, which is a wire made of non-alloy drawn steel or hot-rolled steel. The steel used for manufacturing of cables is characterized by high yield and high tensile strength, which are obtained due to the high carbon content and a good grain structure Singh et al (2016). This contributes to ensure good tenacity of the cable, which prevents local damage to the wires. Nevertheless, cables in service are subjected to several variable loadings, which is related to mechanical, thermal and environmental solicitations. These solicitations lead to different degradations that influence the form and the characteristics of the cable Singh et al (2016) and Dieter (1961). The main causes of rope damage are corrosion and fretting-fatigue, which cause the failure of their component wires. The first mode of degradation is uniform or generalized corrosion (by dissolution), which can lead to more or less