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| Ti-6Al-4V is a commonly used titanium base alloy in aerospace applications. The increasing demand for damage-tolerant designs of such components necessitates a detailed knowledge of its crack growth behavior. The aim of this research was the characterization and phenomenological modeling of long crack growth behavior with respect to microstructure and stress ratio. Therefore, the long crack propagation was characterized for eight different heat treatment conditions and four stress ratios. For comparison,physically short crack growth tests were also performed. The long crack growth threshold was found to be dominated by roughness-induced crack closure, and the fracture surface roughness is controlled by the primary -grain size. The reason for this correlation is a near-threshold crack propagation mode,which is dominated by the transcrystalline fracture of -grains. This correlation was used to model the crack growth threshold with respect to microstructure. A linear relation was determined between the stress ratio and the threshold value, which was also found in this approach. Further presented models cover the crack growth behavior in the near-threshold (Stage I) and mid-growth rate regions (Stage II). |
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2楼2012-03-09 11:11:23
wxb0626
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lidongze(金币+20, 翻译EPI+1): 2012-03-09 19:03:33
lidongze(金币+20, 翻译EPI+1): 2012-03-09 19:03:33
| Ti-6Al-4V 是一种在航天领域中常用的钛基合金。对这种合金成分耐损伤设计日益增长的需求使得了解其裂痕增长行为的详细知识成为必要。本研究的目的是对与微观结构和应力比相关的长裂痕的增长行为进行表征及建立唯象模型。因此，使用了八种不同的热处理条件和四个应力比对裂纹增长进行了表征。为了便于比较，还进行了物理短裂纹增长测试，发现长裂痕增长的阀值由粗糙度诱发的裂纹闭合主导，断裂表面的粗糙度受初生晶粒尺寸控制。存在这种相关性的原因是一种近门槛区的裂纹扩展模式，这种模式是由晶粒的穿晶断裂主导。这种相关性被用来对与微观结构有关的裂纹增长阀值建模。在这种近似中还发现应力比和阀值之间存在线形关系。进一步提出了涵盖近门槛区的裂纹增长行为（第1阶段）和中等增长速率区域（第2阶段）的裂纹增长行为的模型。 |
3楼2012-03-09 14:43:31