Influence of the contact pressure on rolling contact fatigue initiation of 1070 steel

✍ Scribed by Lijuan Lu; Xiaogui Wang; Zengliang Gao; Yanyao Jiang

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 280 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.497

✦ Synopsis

Rolling contact fatigue initiation life of 1070 steel was predicted by the FE method with an advanced cyclic stress-strain plasticity model and a general multiaxial fatigue criterion. The 2D repeated rolling contact processes were carried out by translating the normal pressure and the tangential traction across the contact surface step by step. The normal pressure and the tangential traction were applied to the nodes through the time-dependant amplitude functions as the concentrated nodal forces. With the detailed stress-strain responses outputted from the FE analysis after 20 rolling passes, the multiaxial fatigue criterion was used in the prediction of the initiation life. Several cases were simulated in this work. The k p 0 ratio ranges from 6.0, 7.0 to 8.0, where 0 p the maximum Hertzian pressure, k is the yield stress in shear of the material. Comparing these cases, the initiation life was reduced with the increase of the k p 0 ratio, and crack initiation tends to subsurface.