Local deformation at micro-notches and crack initiation in an intermetallic γ-TiAl-alloy
Local deformation at micro-notches and crack initiation in an intermetallic γ-TiAl-alloy
复制标题
金属间化合物 γ-TiAl 合金中微缺口的局部变形和裂纹萌生
DOI：
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T. Baumert
中科院分区：
文献类型：
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作者：
B. Bode;W. Wessel;A. Brueckner;J. Mildner;M. Wollenhaupt;T. Baumert
研究了全层片γ-TiAl合金微缺口裂纹萌生与局部应变场的关系。使用飞秒激光烧蚀引入这些微凹口，并且这些微凹口的尺寸低于平均菌落尺寸。然后对所研究的样本进行疲劳加载。连续监测使用移动光学显微镜允许在早期阶段检测微裂纹。在疲劳加载之前，施加持续载荷，并使用数字图像相关确定局部应变场。这是补充的缺口及其附近的有限元分析。结果发现，裂纹是从切口引起高的正应变在层方向上，而没有裂纹从切口与高剪切应变。
The relation is studied between crack initiation from micro-notches in a fully lamellar intermetallic γ-TiAl alloy and the local strain field. These micro-notches were introduced using femtosecond-laser ablation and had dimensions below the average colony size. The specimen under investigation was then subjected to fatigue loading. Continuous monitoring using a travelling optical microscope allowed detecting microcracks at an early stage. Prior to fatigue loading, a sustained load was applied and the local strain field was determined using digital image correlation. This was supplemented by a Finite Element analysis of the notches and their neighbourhood. It was found that a crack was initiated from a notch causing high normal strains in lamella direction, whereas no crack was initiated from notches with high shear strains.
金属间化合物γ-TiAl合金中的短疲劳裂纹
影响因子：
3.7
作者：
Wessel;Zeismann;Brueckner-Foit
通讯作者：
Brueckner-Foit
用于研究小裂纹生长的微凹口
影响因子：
3.7
作者：
Wessel;Mildner;Brueckner-Foit
通讯作者：
Brueckner-Foit