Numerical Investigation of 1 × 7 Steel Wire Strand under Fretting Fatigue Condition

Abstract

Wire ropes undergo a fretting fatigue condition when subjected to axial and bending loads. The fretting behavior of wires are classified as line contact and trellis point of contact. The experimental study on the fatigue of wire ropes indicates that most of the failure occurs due to high localized stresses at trellis point of contact. A continuum damage mechanics approach was previously proposed to estimate the fatigue life estimation of wire ropes. The approach majorly depends on the high value of localized stresses as well as the micro-slippage occurs at the contact region. Finite element approach has been used to study radial and axial distribution of stresses and displacement in order to clearly understand the evolution of stresses and existence of relative displacements between neighboring wires under various loading and frictional conditions. The relative movements of contacting wires are more when friction is not considered. In the presence of friction, the relative movement occurs at the boundaries of the contact region. The location of microslip in the presence of friction is backed by the experimental observation stating the crack is initiated at or the outer boundary of the contact spot. The existence of slip is due to different displacement of outer and central wires.

Cumulative fretting fatigue damage model for steel wire ropes

“…29 In the wire ropes, trellis points of contact have a central role in fatigue life at which the stresses are high along with slip at the annulus region of the contact spot. 65,66 The subroutine developed and implemented F I G U R E 1 3 Experimental marks for the fretting fatigue in the annulus region of contact of steel wire ropes. 29 here for the wire-on-wire model will be implemented on wire rope in the future.…”

Effects of Contact Load and Torsion Angle on Crack Propagation Behaviors of Inclined Crossed Steel Wires during Tension–Torsion Fretting Fatigue in Acid Solution

“…They proposed that Manson's method and medians method gave lives closer to those obtained from fretting wear tests in steel wires, and the life reduction is attributed to the increase in normal contact load. Ahmad et al [6] calculated stress distributions and relative displacements of strand wires under fretting fatigue condition. They found that the relative movement occurred at the boundaries of the contact region in the presence of friction, and the existence of slip was due to different displacements of outer and central wires.…”