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[求助]
英譯漢
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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樓2012-03-09 11:11:23
wxb0626
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lidongze(金幣+20, 翻譯EPI+1): 2012-03-09 19:03:33
lidongze(金幣+20, 翻譯EPI+1): 2012-03-09 19:03:33
| Ti-6Al-4V 是一種在航天領(lǐng)域中常用的鈦基合金。對這種合金成分耐損傷設(shè)計日益增長的需求使得了解其裂痕增長行為的詳細(xì)知識成為必要。本研究的目的是對與微觀結(jié)構(gòu)和應(yīng)力比相關(guān)的長裂痕的增長行為進行表征及建立唯象模型。因此，使用了八種不同的熱處理條件和四個應(yīng)力比對裂紋增長進行了表征。為了便于比較，還進行了物理短裂紋增長測試，發(fā)現(xiàn)長裂痕增長的閥值由粗糙度誘發(fā)的裂紋閉合主導(dǎo)，斷裂表面的粗糙度受初生晶粒尺寸控制。存在這種相關(guān)性的原因是一種近門檻區(qū)的裂紋擴展模式，這種模式是由晶粒的穿晶斷裂主導(dǎo)。這種相關(guān)性被用來對與微觀結(jié)構(gòu)有關(guān)的裂紋增長閥值建模。在這種近似中還發(fā)現(xiàn)應(yīng)力比和閥值之間存在線形關(guān)系。進一步提出了涵蓋近門檻區(qū)的裂紋增長行為（第1階段）和中等增長速率區(qū)域（第2階段）的裂紋增長行為的模型。 |
3樓2012-03-09 14:43:31
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