Non-Hertzian rolling contact stress analysis

An elastic-plastic contact stress analysis is presented to study cyclic plastic deformation of surface hardened rolling elements under repeated contacts. The rolling contact is simulated by a Hertz contact loading moving across an elastic-plastic half-space. An exponential model with hardness varying with depth is employed for the surface hardened components, and the Chaboche nonlinear hardening rule is used to model cyclic plastic behavior of contact elements. Numerical results show that the hardened layer can effectively reduce the plastic deformation near contact surface. The contact elements with sufficient surface hardness may reach elastic shakedown state under repeatedly rolling contact. As the hardened layer reaches a certain depth, e.g. two times of half contact length, however, the effects of case depth on plastic strain and residual stress become negligible after hundred contact cycles.

Download Full-text

Influence of Crowning on Rolling Contact Fatigue of Steel Roller : Contact Stress Analysis

The Proceedings of Conference of Chugoku-Shikoku Branch ◽

10.1299/jsmecs.2004.42.403 ◽

2004 ◽

Vol 2004.42 (0) ◽

pp. 403-404

Author(s):

Masahiro FUJII ◽

Akira YOSHIDA ◽

Takahito TABUCHI ◽

Kiyoji MINEGISHI ◽

Jun TAMENAGA

Keyword(s):

Stress Analysis ◽

Contact Stress ◽

Rolling Contact Fatigue ◽

Contact Fatigue ◽

Rolling Contact ◽

Steel Roller

Download Full-text

Rolling contact stress analysis with the application of a new plasticity model

Wear ◽

10.1016/0043-1648(95)06663-2 ◽

1996 ◽

Vol 191 (1-2) ◽

pp. 35-44 ◽

Cited By ~ 48

Author(s):

Yanyao Jiang ◽

Huseyin Sehitoglu

Keyword(s):

Stress Analysis ◽

Contact Stress ◽

Rolling Contact ◽

Plasticity Model

Download Full-text

Kinematics and Contact Stress Analysis of Pediatric Anterior Cruciate Ligament Reconstructions: Do the All-Epiphyseal and Complete Transphyseal Reconstructions Restore Anterior and Rotational Stability?

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967114s00112 ◽

2014 ◽

Vol 2 (7_suppl2) ◽

pp. 2325967114S0011

Author(s):

Moira McCarthy ◽

Hamid Jahandar ◽

Peter D. Fabricant ◽

Kyle Stone ◽

James Boorman-Padgett ◽

...

Keyword(s):

Anterior Cruciate Ligament ◽

Stress Analysis ◽

Contact Stress ◽

Cruciate Ligament ◽

Rotational Stability ◽

Anterior Cruciate

Download Full-text

Comparative study of stress analysis of gears with different helix angle using the ISO 6336 standard and tooth contact analysis methods

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406216639075 ◽

2016 ◽

Vol 230 (7-8) ◽

pp. 1350-1358 ◽

Cited By ~ 4

Author(s):

Layue Zhao ◽

Robert C Frazer ◽

Brian Shaw

Keyword(s):

Stress Analysis ◽

Contact Stress ◽

Helix Angle ◽

Contact Analysis ◽

Bending Stress ◽

Contact Ratio ◽

Tooth Contact Analysis ◽

Tooth Contact ◽

Iso Standard ◽

Analysis Methods

With increasing demand for high speed and high power density gear applications, the need to optimise gears for minimum stress, noise and vibration becomes increasingly important. ISO 6336 contact and bending stress analysis are used to determine the surface load capacity and tooth bending strength but dates back to 1956 and although it is constantly being updated, a review of its performance is sensible. Methods to optimise gear performance include the selection of helix angle and tooth depth to optimise overlap ratio and transverse contact ratio and thus the performance of ISO 6336 and tooth contact analysis methods requires confirmation. This paper reviews the contact and bending stress predicted with four involute gear geometries and proposes recommendations for stress calculations, including a modification to contact ratio factor Zɛ which is used to predict contact stress and revisions to form factor YF and helix angle factor Yβ which are cited to evaluate bending stress. The results suggest that there are some significant deviations in predicted bending and contact stress values between proposal methods and original ISO standard. However, before the ISO standard is changed, the paper recommends that allowable stress numbers published in ISO 6336-5 are reviewed because the mechanisms that initiate bending and contact fatigue have also changed and these require updating.

Download Full-text