发明申请
- 专利标题: ASSESSMENT OF SHEAR FATIGUE PROPERTY OF ROLLING CONTACT METAL MATERIAL AND ESTIMATION OF FATIGUE LIMIT MAXIMUM CONTACT PRESSURE USING SAME ASSESSMENT
- 专利标题(中): 轧制接触金属材料的剪切疲劳性能评估和使用同样评估的疲劳极限最大接触压力估算
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申请号: US13634412申请日: 2011-03-15
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公开(公告)号: US20130006542A1公开(公告)日: 2013-01-03
- 发明人: Yukio Matsubara , Noriaki Sakanaka , Hitoshi Ishii
- 申请人: Yukio Matsubara , Noriaki Sakanaka , Hitoshi Ishii
- 申请人地址: JP Osaka
- 专利权人: NTN Corporation
- 当前专利权人: NTN Corporation
- 当前专利权人地址: JP Osaka
- 优先权: JP2010-059357 20100316; JP2010-059358 20100316; JP2010-059359 20100316; JP2011-054484 20110311; JP2011-054485 20110311; JP2011-054486 20110311; JP2011-054487 20110311; JP2011-054488 20110311; JP2011-054489 20110311; JP2011-054490 20110311; JP2011-054491 20110311
- 国际申请: PCT/JP2011/056037 WO 20110315
- 主分类号: G01N29/44
- IPC分类号: G01N29/44 ; G06F19/00
摘要:
Included are a testing step (S1) for determining the relation between the shear stress amplitude of a rolling contact metallic material and the number of loading by means of an ultrasonic torsional fatigue test, and a shear fatigue strength determining step (S2) for determining the shear fatigue strength τlim, within the ultra long life regime from the relation between the shear stress amplitude and the number of loadings, which relation has been determined during the test step (S1), in accordance with a predetermined standard. It is a completely reversed torsional fatigue test, in which torsional vibrations, respective torsions in the positive rotational direction and reversed rotational direction of which are symmetrical relative to each other, are applied to a test piece (1).