• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>17th European conference on fracture : Multilevel approach to fracture of materials, components and structures : Book of abstracts amp; proceedings on CD ROM >Mechanisms of fatigue crack initiation subsurface and growth of the surface hardened titanium alloy Ti-6Al-3Mo-0.4Si
【24h】

Mechanisms of fatigue crack initiation subsurface and growth of the surface hardened titanium alloy Ti-6Al-3Mo-0.4Si

机译：疲劳裂纹萌生的亚表面和表面硬化钛合金Ti-6Al-3Mo-0.4Si的生长机理

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper demonstrates how to select results of fatigue tests of notched and smooth specimens tested in transition area from High- to Very-High-Cycle-Fatigue. Fatigue tests were realized on the round bar specimens of Ti-6Al-3Mo-0.4Si alloy with 8mm in diameter and some of them had circular notch with 2mm in the depth with radius 2mm. Tests were performed in the range of maximum stress level 120-750MPa at the R-ratio in the range of (-1.0) ÷ (+ 0.67). The discussed transition area for notched specimens was demonstrated in the range of (300-400) Mpa based on the fractographic analysis. Both manners of the crack initiation subsurface and at the surface were seen for different specimens at the same stress level in this area. The crack initiation subsurface was discovered for hardened smooth specimens in all range of stress level (120-400) MPA tested at stress ratio R=-1.0. The crack growth period, NP , estimated based on the fatigue striation spacing measurement, has unified dependence of NP /Nf on the lifetime to failure Nf .
机译：本文演示了如何选择在从高至超高循环疲劳过渡区域中测试的缺口和光滑试样的疲劳测试结果。对直径为8mm的Ti-6Al-3Mo-0.4Si合金圆棒试样进行了疲劳试验，其中一些试样的深度为2mm，半径为2mm的圆形缺口。在R值范围为（-1.0）÷（+ 0.67）的最大应力水平为120-750MPa的范围内进行了测试。根据分形分析，在（300-400）Mpa范围内证明了所讨论的带缺口样品的过渡面积。在该区域中，在相同应力水平下，对于不同的试样，都可以看到两种形式的裂纹萌生方式。在应力比R = -1.0的所有应力水平（120-400）MPA范围内，发现了硬化的光滑试样的裂纹萌生子表面。根据疲劳条纹间距测量值估算的裂纹扩展周期NP具有NP / Nf对失效寿命Nf的统一依赖性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号