• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>World Conference on Titanium v.3; 20030713-20030718; Hamburg; DE >Influence of Variable Amplitude Loading on Fatigue Crack Propagation Behavior of Ti-6Al-4V
【24h】

Influence of Variable Amplitude Loading on Fatigue Crack Propagation Behavior of Ti-6Al-4V

机译：变幅载荷对Ti-6Al-4V疲劳裂纹扩展行为的影响

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

In this study the fatigue crack propagation behavior upon variable amplitude loading of Ti-6Al-4V alloy with two different microstructures, a β-annealed coarse lamellar structure and a much finer (α+β)-processed bi-modal structure consisting of 25 vol.% equiaxed primary a in a lamellar matrix, was investigated. The loading procedure consisted of sinusoidal constant amplitude baseline cycles (R = 0.1) with periodically applied single tensile overloads (overload ratio 1.5). The numbers n = 100 and n = 1000 of intermittent constant amplitude baseline cycles between two consecutive overloads were analyzed. The tests were carried out on CT-specimens in air at room temperature. The two major results of this study are presented. Independently of constant or variable amplitude loading procedure chosen in this study, the crack propagation resistance of the coarse lamellar microstructure is much higher than that of the much finer bi-modal microstructure. A significant retardation of the fatigue crack propagation rate occurs for n = 1000. However, the reduction of crack growth rates behavior is more pronounced for the bi-modal than for the lamellar microstructure. The variation in crack propagation behavior with regard to microstructure as well as in response to loading procedure are discussed on the basis of variations in crack front geometry, detailed fracture surface investigations and measured crack closure levels.
机译：在这项研究中，Ti-6Al-4V合金在两种振幅不同的微观振幅载荷下的疲劳裂纹扩展行为，分别是β退火的粗层状结构和由25vol％组成的更精细的（α+β）处理双峰结构。研究了层状基质中。％等轴的伯α。加载程序由正弦恒定振幅基线循环（R = 0.1）和周期性施加的单次拉伸过载（过载比1.5）组成。分析了两个连续过载之间间歇性恒定振幅基线周期的数量n = 100和n = 1000。测试是在室温下在空气中的CT样品上进行的。介绍了这项研究的两个主要结果。与本研究中选择的恒定或可变振幅加载程序无关，粗糙的层状微结构的裂纹扩展阻力远高于更精细的双峰微结构。在n = 1000时，疲劳裂纹扩展速率发生了明显的延迟。但是，双峰型的裂纹扩展速率行为的降低比层状微结构的降低更为明显。根据裂纹前沿几何形状的变化，详细的断裂表面研究和测得的裂纹闭合水平，讨论了裂纹扩展行为相对于微观结构以及响应加载程序的变化。

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