The 12th International Conference on Fracture Fatigue and Wear (FFW 2024)

Abstract: The hoisting ropes of large equipment (such as coal mine shaft, deep-sea drilling rig) are subjected to alternating tension fatigue load and bending fatigue load. They result in fatigue load of the steel wire inside the rope, contact load and relative slip between adjacent steel wires. Then fretting wear, crack initiation, crack propagation and final fracture of steel wire will occur, that is, fretting fatigue. Serious fretting fatigue inside the rope can reduce the load strength and service life of hoisting rope. However, at present, there is no quantitative evaluation method for the service life of hoisting rope based on fretting fatigue damage. It is impossible to predict the actual service life and service reliability of hoisting ropes, which seriously affects the safety and reliability of large equipment. In order to evaluate the hoisting rope life, we carried out the wire fretting fatigue experiment. Based on the experimental results, combined with the finite element method, tribology theory, fatigue and fracture mechanics theory, we constructed the fretting fatigue wear evolution model, crack initiation prediction model and crack propagation prediction model of steel wire. The fretting fatigue life prediction model of steel wire considering wear, crack initiation and propagation was proposed. Based on the bending fatigue experiments of wire rope and finite element analyses, we proposed the hoisting rope life prediction model based on fretting fatigue. The results show that the service life prediction result of hoisting rope is accurate.

Biography: Da-Gang Wang, born in 1984, BA in Mechanical Engineering in 2007, and Ph.D. in Mechanical Engineering in 2012, both from China University of Mining and Technology, China. From 2010-2012, he studied as a joint doctoral student at the University of Wuppertal in Germany. He worked at School of Mechanical and Electrical Engineering, China University of Mining and Technology from 2013. His current position is a Professor and Director of Mechanical Design department. His research areas cover the fretting tribology and Intelligent Damage Identification. 1) With the background of hoisting wire rope in mine, he carried out research on multi-axial fretting fatigue damage of steel wire under complex working conditions and environment, explained the fretting damage mechanism of steel wire, and proposed the fretting fatigue life prediction model and the life prediction model of steel wire rope. 2) He conducted an evaluation study on the service safety of the main cable of a long-span suspension bridge. He carried out theoretical and simulation analysis on the mechanical characteristics of the main cable of the suspension bridge, and explored the tribo-corrosion, tribo-corrosion-fatigue, dynamic contact and micro-slip behavior of the main cable wires through experiments. Based on the experimental and simulation results, he proposed an anti-skid safety evaluation of the main cable strands. 3) Da-Gang Wang also studied the deterioration mechanism of hoisting rope of deep sea drilling rig and quantitative identification of damage. The damage mechanisms of bending tribo-fatigue and bending fatigue behaviors of wire rope were revealed through self-made bending tribo-fatigue testing rig and rope fatigue testing rig with multiple pulley sets. Based on magnetic flux leakage detection technology, machine and deep learning technology, the damage of wire rope is quantitatively identified. 4) He presided over more than 8 state-level projects such as the National Natural Science Foundation project, the National key Research and Development Program of China (sub-project), and etc.). 5) He has published 2 academic monographs, more than 100 papers in well-known journals at home and abroad, and authorized more than 50 domestic and foreign invention patents. He is the winner of one hundred outstanding doctoral theses in Jiangsu Province, and has won four provincial and ministerial level scientific and technological progress awards.