Improve_Real_World_Performance_with_Structures_Simulation MODSIM 3DXCONFERENCE
I am pleased to invite you to Dr. Mohd Nasir Tamin's presentation on the Global 3DEXPERIENCE Modeling and Simulation Virtual Conference on November 17th & 18th.
Abstract
Challenge
Conventional approach to the fatigue life design of steel wire ropes employs the measured strength-life (S-N) curves along with the classical Modified Goodman’s equations and/or SWT parameters to account for the mean stress effect. This calls for the time-consuming and costly fatigue life testing program of the wire ropes covering the various designs of the stranded wire ropes, range of design loads, and the different drawn wire materials. Yet, such approach do not account for the different failure mechanisms of the steel wire ropes, thus the reliability prediction remains questionable.
Solution
Our team proposes a new damage-based approach to reliability prediction of the steel wire ropes. The methodology is based on two aspects. One is the computed local stress field in the critical trellis contact zone of a stranded wire rope, by the Abaqus/Standard. The other is the measured degradation of the Young’s modulus of the drawn steel wires. This approach allows for addressing the different damage mechanisms, namely, fretting fatigue, fretting wear, and corrosion fatigue, dominating the fracture scene of the stranded wire ropes. The fretting fatigue model is based on Lemitaire’s damage equations for quasi-brittle material with a damageable micro-inclusion embedded in an elastic meso-element. This fretting fatigue damage model is then introduced into Abaqus Unified FEA software through user-defined subroutine (UMAT). The incremental fatigue damage calculations employing the load-cycle block is introduced to address the associated computational efficiency of the fatigue life calculations. The initiation and propagation of the fretting fatigue crack across the critical fretted wires in the wire rope could be established as a function of the applied load cycles. In this approach, the S-N curve of the selected steel wire rope is only used to provide the global response for validating the damage-based FE simulation model and procedures.
Benefit
The validated damage-based FE simulation procedures would allow the steel wire rope industry to accurately predict the reliability (fatigue lives) of their newly-designed steel wire ropes. Such simulation results could be used to address manufacturing issues related to product life. In addition, the FE-based procedures could also be employed to generate reliability data of the new steel wire ropes, thus, shortened the time-to-market of new products.
Presentation Replay
I am available here to answer the questions
