| タイトル | Mechanisms of rolling contact spalling |
| 本文（外部サイト） | http://hdl.handle.net/2060/19880004998 |
| 著者（英） | Bhargava, V.; Kulkarni, S. M.; Kumar, A. M.; Hahn, G. T.; Rubin, C. A. |
| 著者所属（英） | Vanderbilt Univ. |
| 発行日 | 1987-05-30 |
| 言語 | eng |
| 内容記述 | The results of a study aimed at analyzing the mechanical material interactions responsible for rolling contact spalling of the 440 C steel, high pressure oxygen turbopump bearings are presented. A coupled temperature displacement finite element analysis of the effects of friction heating under the contact is presented. The contact is modelled as a stationary, heat generating, 2 dimensional indent in an elastic perfectly plastic half-space with heat fluxes up to 8.6 x 10000 KW/m sq comparable to those generated in the bearing. Local temperatures in excess of 1000 C are treated. The calculations reveal high levels of residual tension after the contact is unloaded and cools. Efforts to promote Mode 2/Mode 3 fatigue crack growth under cyclic torsion in hardened 440 C steel are described. Spalls produced on 440 C steel by a 3 ball/rod rolling contact testing machine were studied with scanning microscopy. The shapes of the cyclic, stress strain hysteresis loops displayed by hardened 440 C steel in cyclic torsion at room temperature are defined for the plastic strain amplitudes encountered in rolling/sliding contact. Results of these analyses are discussed in detail. |
| NASA分類 | MECHANICAL ENGINEERING |
| レポートNO | 88N14380
NASA-CR-179243
NAS 1.26:179243 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/147879 |
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