Fatigue Crack Growth Thresholds of Aerospace Alloys
航空航天合金的疲劳裂纹扩展阈值
基本信息
- 批准号:1939226
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:英国
- 项目类别:Studentship
- 财政年份:2017
- 资助国家:英国
- 起止时间:2017 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Two alloys, Fine Grain (FG) RR1000 and a new as-cast TNM Titanium Aluminide (TiAl) are being tested to find the thresholds across a range of conditions. For FG RR1000 load shedding thresholds and load increasing thresholds are being conducted, to understand the impact of R ratio, loading frequency and crack growth mechanism on threshold, along with their interactions. The new as-cast TiAl alloy is undergoing preliminary testing to compare to current TiAl manufacturing processes and compositions. This will likely lead onto further testing to understand how R ratio and temperature impact on the threshold of the alloy.New characterisation techniques, Digital Image Correlation (DIC) and Synchrotron 2D X-ray Diffraction (2D-XRD) are being used to understand more about the strain fields ahead of the crack tip along with plastic deformation. Both of these are new in the research group and so are being developed.DIC is performed using an open source DIC software that has been benchmarked by comparing the equations and algorithms used against literature to ensure it is robust and highlight any weaknesses if any. The issue with DIC is the trade off between spatial resolution and errors so algorithms from literature have been implemented to aid in selecting a good subset size to enable time saving and adaptability between tests to ensure that the analysis is optimised to each individual case. Some of these algorithms have been modified to aid in showing areas of speckle patterns used for DIC that are lacking in quality, subsequently reducing the accuracy of the DIC analysis. DIC is a technique that can be performed in house giving more information about the strains present and displacements leading to information about crack tip opening displacements. The crack tip opening displacements can then be used to understand more about crack tip blunting should sufficient resolution be achieved through DIC.Synchrotron 2D-XRD analysis is being developed with a unique method to separate the y and y' by initially using the super-lattice reflections of y' and then inferring the peak position onto the shared y/y' peaks to de-convolute the shared peaks. The peak positions and Full Width at Half Maximum's are used to measure elastic strains and also represent the degree of plastic deformation that has occurred in a vicinity around a crack tip. The aim with this analysis is to understand the underlying processes that cause threshold to increase with time spent cycling sub-threshold, which is clearly observed during prolonged dwells (3600 s).
两种合金,细晶粒(FG)RR 1000和一种新的铸态TNM钛合金(TiAl)正在进行测试,以找到在一系列条件下的阈值。对于FG RR 1000,正在进行减载阈值和增载阈值试验,以了解R比、加载频率和裂纹扩展机制对阈值的影响,以及它们之间的沿着相互作用。新的铸态TiAl合金正在进行初步测试,以与当前的TiAl制造工艺和成分进行比较。这可能会导致进一步的测试,以了解R比和温度如何影响合金的阈值。新的表征技术,数字图像相关(DIC)和同步加速器二维X射线衍射(2D-XRD)正在被用来了解更多关于应变场的裂纹尖端沿着与塑性变形。这两个都是研究小组的新技术,因此正在开发中。DIC是使用开源DIC软件执行的,该软件已通过将所使用的方程和算法与文献进行比较来进行基准测试,以确保其稳健并突出显示任何弱点(如果有的话)。DIC的问题是空间分辨率和误差之间的权衡,因此已经实施了文献中的算法来帮助选择良好的子集大小,以节省时间和测试之间的适应性,以确保分析针对每个单独的情况进行优化。这些算法中的一些已经被修改以帮助显示用于DIC的斑点图案的质量不足的区域,从而降低DIC分析的准确性。DIC是一种可在室内进行的技术,可提供有关应变和位移的更多信息,从而获得有关裂纹尖端张开位移的信息。如果通过DIC实现足够的分辨率,则裂纹尖端开口位移可以用于更多地理解关于裂纹尖端钝化的情况。同步加速器2D-XRD分析正在开发一种独特的方法,通过最初使用y'的超晶格反射来分离y和y',然后将峰位置推断到共享的y/y'峰上以使共享的峰去卷积。峰值位置和半峰全宽用于测量弹性应变,也表示在裂纹尖端附近发生的塑性变形程度。该分析的目的是了解导致阈值随着循环亚阈值所花费的时间而增加的潜在过程,这在长时间停留(3600 s)期间清楚地观察到。
项目成果
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其他文献
吉治仁志 他: "トランスジェニックマウスによるTIMP-1の線維化促進機序"最新医学. 55. 1781-1787 (2000)
Hitoshi Yoshiji 等:“转基因小鼠中 TIMP-1 的促纤维化机制”现代医学 55. 1781-1787 (2000)。
- DOI:
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LiDAR Implementations for Autonomous Vehicle Applications
- DOI:
- 发表时间:
2021 - 期刊:
- 影响因子:0
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吉治仁志 他: "イラスト医学&サイエンスシリーズ血管の分子医学"羊土社(渋谷正史編). 125 (2000)
Hitoshi Yoshiji 等人:“血管医学与科学系列分子医学图解”Yodosha(涉谷正志编辑)125(2000)。
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Effect of manidipine hydrochloride,a calcium antagonist,on isoproterenol-induced left ventricular hypertrophy: "Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,K.,Teragaki,M.,Iwao,H.and Yoshikawa,J." Jpn Circ J. 62(1). 47-52 (1998)
钙拮抗剂盐酸马尼地平对异丙肾上腺素引起的左心室肥厚的影响:“Yoshiyama,M.,Takeuchi,K.,Kim,S.,Hanatani,A.,Omura,T.,Toda,I.,Akioka,
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